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Institute of Electrical & Electronic Engineers
(11534 results)-
Whitepapers
Routing With Probabilistic Delay Guarantees in Wireless Ad-Hoc Networks
October 29, 2008, 12:00am PDT
In many wireless ad-hoc networks it is important to find a route that delivers a message to the destination within a certain deadline (delay constraint). The authors propose to identify such...
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Whitepapers
Queuing Analysis for Multiuser Downlink Channel: Throughput Regions and Exponential Backlog Bounds
October 29, 2008, 12:00am PDT
While multiuser scheduling strategies have been intensively studied recently, the resulting throughput and delay performance affecting strongly end-to-end performance of wireless communication...
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Whitepapers
A Distributed Resource Control for Fairness in OFDMA Systems : English-Auction Game With Imperfect Information
October 29, 2008, 12:00am PDT
In this paper, the authors study a distributed resource control problem achieving fairness and information theoretic capacity in an OFDMA system. For practicality, they consider an OFDMA system...
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Whitepapers
On The Effect of Antenna Height On the Characterization of The Indoor UWB Channel
October 29, 2008, 12:00am PDT
Ultra-WideBand (UWB) technology is being proposed for several short range wireless applications. Some of the applications, such as position location devices for rescue personnel, may require the...
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Whitepapers
A Novel Spatial Autocorrelation Model of Shadow Fading in Urban Macro Environments
October 29, 2008, 12:00am PDT
In this paper, the authors propose a novel spatial autocorrelation model of the shadow fading process in urban macro environments. The proposed model is based on the empirical results obtained...
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Whitepapers
Doppler Spread and Coherence Time of Rural and Highway Vehicle-to-Vehicle Channels at 5.9 GHz
October 29, 2008, 12:00am PDT
An experimental study of the Doppler coherence time properties of Vehicle-To-Vehicle (V2V) wireless channels at 5.9 GHz in both rural and highway environments is presented. Simultaneous RF and...
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Whitepapers
On the Level Crossing Rate and Average Fade Duration of Composite Multipath/Shadowing Channels
October 29, 2008, 12:00am PDT
In this paper, the authors consider composite multipath/shadowing fading channels characterized by Nakagami-m fading with Inverse Gaussian shadowing, and Rice fading with Inverse Gaussian...
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Whitepapers
Delay Analysis of Wireless Nakagami Fading Channels
October 29, 2008, 12:00am PDT
In this paper, the authors analyze the delay performance of a single user with perfect channel state information transmitting data over a wireless fading channel. They consider a dynamic resource...
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Whitepapers
Low-Complexity SQR-Based Decoding Algorithm for Quasi-Orthogonal Space-Time Block Codes
October 29, 2008, 12:00am PDT
In this paper, the authors propose a new decoding algorithm for Quasi-Orthogonal Space-Time Block Codes (QOSTBCs) which achieves near Maximum Likelihood (ML) performance while substantially...
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Whitepapers
Low-Complexity Maximum Likelihood Detection of Orthogonal Space-Time Block Codes
October 29, 2008, 12:00am PDT
Space-Time Block Codes (STBCs) from Orthogonal designs (OSTBCs) are attractive since they achieve the maximum diversity, the maximum coding gain, and the highest throughput. These codes are used...
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Whitepapers
Low-Complexity Hybrid QRD-MCMC MIMO Detection
October 29, 2008, 12:00am PDT
In this paper, the authors propose a novel hybrid QRDMCMC MIMO detector that combines the features of a QRD-M detector and a Markov Chain Monte Carlo (MCMC) detector. The QRD-M algorithm is...
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Whitepapers
QRD-QLD Searching Based Sphere Detection for Emerging MIMO Downlink OFDM Receivers
October 29, 2008, 12:00am PDT
In this paper, a detection algorithm with parallel partial candidate-search algorithm is presented. Two fully independent partial search processes are simultaneously employed for two groups of...
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Whitepapers
Novel Sort-Free Detector With Modified Real-Valued Decomposition (M-RVD) Ordering in MIMO Systems
October 29, 2008, 12:00am PDT
K-best MIMO detection technique is the prominent method of simplifying the detection complexity in MIMO systems while maintaining BER performance comparable with the optimum Maximum-Likelihood...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Uplink Ergodic Mutual Information of OFDMA-based Two-Hop Cooperative Relay Networks With Imperfect CSI
October 29, 2008, 12:00am PDT
This paper analyzes the ergodic mutual information of OFDMA cooperative relay networks when the Channel State Information (CSI) imperfection is considered at resource allocation unit. Based on the...
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Whitepapers
Performance Analysis for OFDMA Downlink Relay Systems: Relay Gain and Fairness
October 29, 2008, 12:00am PDT
This paper defines a new metric: a relay gain that measures the performance gain of users using relaying channels at distance s from a base station. The paper derives the closed form of the relay...
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Whitepapers
MAC-PDU Size Optimization for OFDMA Modulated Wireless Relay Networks
October 29, 2008, 12:00am PDT
Hop adaptive MAC-PDU (Protocol Data Unit) size optimization is proposed for Orthogonal Frequency Division Multiple Access (OFDMA) based wireless relay networks. Such optimization improves the...
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Whitepapers
On Optimal Transmission Range for Multihop Cellular Networks
October 29, 2008, 12:00am PDT
Multihop Cellular Network (MCN) combines the best features of both conventional Single hop Cellular Network (SCN) and Ad-hoc networks. In MCN, mobile terminals transmit packets to base stations as...
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Whitepapers
Positioning in Wireless Sensor Networks Using Array Processing
October 29, 2008, 12:00am PDT
In this paper, a novel positioning approach for Wireless Sensor Networks (WSNs) is proposed. The approach locates a given target node by using a number of surrounding anchor nodes as an array of...
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Whitepapers
Maximizing Transport Capacity for Geographic Transmission on Nakagami-m Channels
October 29, 2008, 12:00am PDT
In Mobile Ad hoc NETworks (MANETs), conventional packet forwarding schemes that pre-select the next-hop receivers for a packet may fail if the channel coherence time is on the order of the typical...
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Whitepapers
User Capacity of Rician and Nakagami Fading Broadcast Channels
October 29, 2008, 12:00am PDT
Transmission over wireless channels is severely affected by multi-path propagation. To model this phenomenon in wireless communications, different statistical models have been proposed and fading...
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Whitepapers
The Influence of the Severity of Fading and Shadowing on the Statistical Properties of the Capacity of Nakagami-Lognormal Channels
October 29, 2008, 12:00am PDT
This paper deals with the study of the statistical properties of the capacity of Nakagami-Log-Normal (NLN) channels for various fading environments. Specifically, the impact of shadowing and the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A General Exact Formulation for the Outage Probability in Interference-Limited Systems
October 29, 2008, 12:00am PDT
This paper presents a useful, novel formulation for the outage probability in interference-limited communication systems, here named Joint Outage Probability (JOP). Given a set of SIR restrictions...
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Whitepapers
Performance Analysis of a Partially Coherent System Using Constellation Rotation and Coordinate Interleaving
October 29, 2008, 12:00am PDT
Coherent detection of M-ary Phase Shift Keying (MPSK) signals requires the generation or extraction of a local carrier phase reference. In most applications a perfect local reference is not...
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Whitepapers
Short Term Link Performance Modeling for ML Receivers With Mutual Information Per Bit Metrics
October 29, 2008, 12:00am PDT
Link performance abstraction with simplified models that accurately capture the decoded receiver performance under fading channels has several applications. Such models help a receiver estimate a...
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Whitepapers
Robust Channel Tracking in Fast Fading MIMO Channels
October 29, 2008, 12:00am PDT
Channel estimation for Alamouti Space Frequency Coded (ASFC) 2×2 and 2×1 MIMO OFDM systems, employing Decision Directed Channel Tracking (DDCT) for high fade rates and long frame durations is...
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Whitepapers
Data Detection for Doubly-Selective MIMO Channels Using Decision-Directed Channel Tracking and Exponential Basis Models
October 29, 2008, 12:00am PDT
The authors present a decision-directed tracking approach to doubly-selective MIMO channel estimation, exploiting the Complex Exponential Basis Expansion Model (CE-BEM) for the overall channel...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Ranging Signal Designs for MIMO-OFDMA Systems
October 29, 2008, 12:00am PDT
In this paper, the authors propose new ranging signal designs for time-division duplexing Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiple Access (OFDMA) systems....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Orthogonal Space-Time Block Codes Over Semi-Identical Channels With Channel Estimation
October 29, 2008, 12:00am PDT
Assuming the channel gains associated with different receive antennas are not identically distributed, the authors study the orthogonal space-time block codes over non-identical channels with...
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Whitepapers
Packet Length Optimization for MIMO Mobile Systems With Estimated CSI
October 29, 2008, 12:00am PDT
The reliability of mobile packet data transmission in Multi-Input Multi-Output (MIMO) communication systems is degraded by time-varying multi-path channel fading. This so-called Doppler-effect can...
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Whitepapers
Generalized Differential Transmission for STBC Systems
October 29, 2008, 12:00am PDT
Recent research has shown that Differential Transmission (DT) can be applied to STBC systems so that the receiver does not need Channel State Information (CSI) when compared to coherent detector....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of MIMO HARQ Under Receiver Complexity Constraints
October 29, 2008, 12:00am PDT
Hybrid Automatic Repeat reQuest (HARQ) schemes are becoming common in wireless systems. In addition to the channel characteristics, several system design considerations need to be taken into...
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Whitepapers
A New Diagonally Layered Spatial Multiplexing Scheme With Partial Channel Knowledge
October 29, 2008, 12:00am PDT
Vertical layering with Successive Interference Cancellation (SIC) at the receiver (e.g., V-BLAST) is a popular spatial multiplexing scheme that achieves high data rates over multi-antenna wireless...
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Whitepapers
High-Rate Space-Time Coded Large MIMO Systems: Low-Complexity Detection and Performance
October 29, 2008, 12:00am PDT
Large MIMO systems with tens of antennas in each communication terminal using full-rate non-orthogonal Space-Time Block Codes (STBC) from Cyclic Division Algebras (CDA) can achieve the benefits of...
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Whitepapers
MIMO Transmitter Optimization With Mean and Covariance Feedback for Low SNR
October 29, 2008, 12:00am PDT
Multiple-input multiple-output system capacity can be improved when there is Channel State Information at the Transmitter (CSIT). This paper proposes a transmission optimization strategy that aims...
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Whitepapers
Robust Designs for MISO-Based Cognitive Radio Networks With Primary User's Partial Channel State Information
October 29, 2008, 12:00am PDT
Cognitive radio is an emerging technology improving the spectrum utilization efficiency in communication systems. In this paper, the authors are interested in a Multiple-Input Single-Output (MISO)...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
GLRT-Based Spectrum Sensing for Cognitive Radio
October 29, 2008, 12:00am PDT
In this paper, the authors propose several spectrum sensing methods designed using the Generalized Likelihood Ratio Test (GLRT) paradigm, for application in a cognitive radio network. The proposed...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Comparison of Three Classes of Spectrum Sensing Techniques
October 29, 2008, 12:00am PDT
Spectrum sensing is used to identify the (temporarily) unused (licensed) frequency bands and as such plays a key role in dynamic spectrum access. Spectrum sensing is currently being investigated...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Sensing-Based Spectrum Sharing in Cognitive Radio Networks
October 29, 2008, 12:00am PDT
In this paper, a new spectrum sharing model called sensing-based spectrum sharing is proposed for cognitive radio networks. This model consists of two phases: in the first phase, the Secondary...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Cognitive Framework for Improving Coexistence Among Heterogeneous Wireless Networks
October 29, 2008, 12:00am PDT
In this paper, the authors study the channel estimation problem for the Two-way Wireless Relay Network (TWRN) where two terminals exchange their information through a relay node in a...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Horizontal Aggregations in SQL to Prepare Data Sets for Data Mining Analysis
January 1, 2012, 12:00am PST
Preparing a data set for analysis is generally the most time consuming task in a data mining project, requiring many complex SQL queries, joining tables and aggregating columns. Existing SQL...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Selective Cooperative Relaying in OFDMA-TDD System for Broadband Mobile Wireless Services
April 15, 2008, 12:00am PDT
Depending on the position of mobile stations in the multihop relay system, various types of cooperative relaying schemes show the different level of throughput and outage performance, due to their...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
In-Band Interference Effects on UTRA LTE Uplink Resource Block Allocation
April 15, 2008, 12:00am PDT
In this paper, the authors investigate the impact of in-band interference on the uplink multiple access of UMTS Terrestrial Radio Access, Long Term Evolution (UTRA LTE). In-band and out-of-band...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis of Interference Effects between Co-Existent 802.11b and 802.11g Wi-Fi Systems
April 15, 2008, 12:00am PDT
The main aim of this paper is to provide insights into the performance degradation caused by interference between coexistent 802.11b and 802.11g WiFi systems operating in environments where...
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Whitepapers
Integrated GSM/WiFi Backhauling over Satellite: Flexible Solution for Emergency Communications
April 15, 2008, 12:00am PDT
This paper presents the development of a compact, ruggedized satellite terminal, to be used for communications in emergency situation. The terminal provides GSM coverage in disaster area, where...
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Whitepapers
Dynamic Priority Queue Handover Scheme for Multiservice
April 15, 2008, 12:00am PDT
Mobile service will be more various and handover have to adapt different Quality-of-Service (QoS) requirements of all kinds of service in 4G mobile communication systems. In the paper, a dynamic...
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Whitepapers
Analytical Estimation of Packet Delays in Relay-Based IMT-Advanced Networks
April 15, 2008, 12:00am PDT
The paper shows that relays as inherent technology of IMT-Advanced system can provide low delays as required for future multi-media services. The results shown prove that the proposed relaying...
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Whitepapers
The Architecture of Cross-Campus WLAN Roaming Environment in Taiwan
April 15, 2008, 12:00am PDT
There are totally 163 colleges and universities in Taiwan, 90% of them have established their campus WLAN environment and 61% of them have joined the cross-campus WLAN roaming environment under...
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Whitepapers
Uplink VoIP Performance in E-UTRAN TDD Mode
April 15, 2008, 12:00am PDT
The Long Term Evolution (LTE) of 3GPP radio-access technology aims to develop a framework towards a high-data-rate, low-latency and packet-optimized radio access technology: Evolved Universal...
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Whitepapers
VoIP performance in "MeshBed" - A Wireless Mesh Networks Testbed
April 15, 2008, 12:00am PDT
This paper presents a WLAN based next generation wireless mesh testbed, called "MeshBed". The aim of this testbed is to investigate carrier-grade mesh network aspects from network operator's point...
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Whitepapers
Load Matrix Optimization in Mobile Cellular Networks
April 15, 2008, 12:00am PDT
Future mobile networks providing multitude of services with large range of QoS requirements has made the importance of Radio Resource Management (RRM) ever more significant. Traditional scheduling...
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Whitepapers
Theoretical Capacity and Outage Rate of OFDMA Cellular System with Fractional Frequency Reuse
April 15, 2008, 12:00am PDT
Employing Fractional Frequency Reuse (FFR) in OFDMA cellular systems is attracting a lot of attention since it offers large capacity and one-cell frequency reuse. However its performance under...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Wireless Mesh Network-Based Platform for ITS
April 15, 2008, 12:00am PDT
Although efficient and safe transportation of people and goods is paramount transportation problems continue to soar. Traffic congestions are of the most visible of transportation problems in...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Resource Allocation Techniques for OFDMA-Based Decode-and-Forward Relaying Networks
April 15, 2008, 12:00am PDT
In this paper, the authors focus on the design of efficient resource allocation algorithms for a multihop cellular network, with Orthogonal Frequency Division Multiple Accesses (OFDMA) as downlink...
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Whitepapers
Extending Enterprise Architecture with Mobility
April 15, 2008, 12:00am PDT
This paper discusses the extension of the Enterprise Architecture (EA) with mobile technologies. The mobile technologies provide the modern business with benefits of location and time independence...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Dynamic Access Network Selection with QoS Parameters Estimation: A Step Closer to ABC
April 15, 2008, 12:00am PDT
Always Best Connected (ABC) services allow multimode mobile terminals to stay connected to the best available networks, at anytime according to user preferences. One of the key aspects in...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Boosting Video Capacity of IEEE 802.11n Through Multiple Receiver Frame Aggregation
April 15, 2008, 12:00am PDT
The technology based on the IEEE 802.11 standard has been hugely successful, and is evolving towards even higher speeds and richer features. In particular, the 802.11n amendment of the standard...
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Whitepapers
A Novel Approach for Realistic Emulation of Vehicle-2-X Communication Applications
April 15, 2008, 12:00am PDT
New applications in future intelligent transportation systems are to enhance both safety and traffic efficiency. Wireless vehicular communication is to provide the basis for the new Vehicle-2-X...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
QoS Oriented Time and Frequency Domain Packet Schedulers for The UTRAN Long Term Evolution
April 15, 2008, 12:00am PDT
In this paper, the authors introduce Orthogonal Frequency Division Multiple Access (OFDMA) downlink general packet scheduling methods for throughput fairness control among users. The investigation...
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Whitepapers
Distributed Detection in OFDM Based Ad Hoc Overlay Systems
April 15, 2008, 12:00am PDT
Overlay systems are a feasible approach to increase the efficiency of spectrum use. An independent Secondary User (SU) system operates in the same frequency band as a Primary User (PU) system. In...
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Whitepapers
Performance Evaluation of a Relay-Based 4G Network Deployment with Combined SDMA/OFDMA and Resource Partitioning
April 15, 2008, 12:00am PDT
This paper presents a low-cost, low complexity deployment concept for a relay-based cellular broadband network. The concept is based on a combination of a multi-antenna OFDMA Base Station (BS) and...
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Whitepapers
On the Benefits of Relays in a Metropolitan Area Network
April 15, 2008, 12:00am PDT
The main motivation to deploy fixed wireless relays in a wireless communication system is to save costs while achieving a similar or better service level and coverage than with a base station only...
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Whitepapers
Analytic Evaluation of a Hybrid Broadcast-Unicast TV Offering
April 15, 2008, 12:00am PDT
Today mobile TV services in cellular spectrum are delivered over unicast radio bearers as offered by 3G technologies like WCDMA and HSDPA. Since unicast transmission does not scale very well if...
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Whitepapers
Performance of Uplink Fractional Power Control in UTRAN LTE
April 15, 2008, 12:00am PDT
UTRAN Long Term Evolution is currently being standardized in 3GPP with the aim of more than twice the capacity over High-Speed Packet Access. The chosen multiple access for uplink is Single...
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Whitepapers
Low Power Consumption Solutions for Instant Messaging on Mobile Devices
April 15, 2008, 12:00am PDT
Instant Messaging (IM) services enable real-time text and multimedia exchange and online presence awareness. Users typically log onto IM services persistently in order to discover available...
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Whitepapers
Improving SC-FDMA Performance by Turbo Equalization in UTRA LTE Uplink
April 15, 2008, 12:00am PDT
Turbo equalization is known as an advanced iterative equalization and decoding technique that allows to enhance the performance of the data transmission over a frequency selective fading channel....
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Whitepapers
Web Optimization in Real UMTS Networks with Channel Switching Mechanisms
April 15, 2008, 12:00am PDT
Web download performance is dramatically degraded in UMTS, resulting in perceived throughputs of around 25% of the expected bandwidth even in favorable conditions. The authors analyze the main...
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Whitepapers
Performance of WiMAX Networks Integrated in a Segment of Satellite Using Channel Reservation Mechanism
April 15, 2008, 12:00am PDT
Mobility issue and service continuity represent important challenges for next generation networks. The integration of a satellite segment within a terrestrial network (especially WiMAX) has...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Spectral Correlation-Based Multi-Antenna Spectrum Sensing Technique
March 11, 2008, 12:00am PDT
To meet the challenges in sensing the spectrum in a reliable and timely manner, an approach of multi-antenna spectrum sensing based on spectral correlation property is proposed in this paper....
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Whitepapers
Energy-Efficient Joint Power and Rate Control via Pricing in Wireless Data Networks
March 11, 2008, 12:00am PDT
Next Generation wireless networks are evolving towards all-data system which are expected to support a variety of application services with diverse transmission rates. Meanwhile, since most of the...
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Whitepapers
Optimal Voice Admission Control Performance under Soft Vertical Handoff in Loosely Coupled 3G/WLAN Networks
March 11, 2008, 12:00am PDT
Low cost WLAN networks are very likely to be loosely coupled to high cost 3G networks in order to provide the 3G subscribers with an extended WLAN capacity and the WLAN subscribers with the 3G...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Introduction to the Cognitive Concept as a Cost-Effective Method for Network Performance Management
March 11, 2008, 12:00am PDT
A successful journey beyond 3G towards 4G Mobile is ensured to a large extent by creating cost-effective solutions for ubiquitous converged voice and data networks. This could be achieved through...
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Whitepapers
Subchannel-Division Adaptive Resource Allocation Technique for Cooperative Relay-Based MIMO/OFDM Wireless Communication Systems
March 11, 2008, 12:00am PDT
In this paper, the authors propose cooperative division relay based allocation technique jointly with adaptive bit/power loading for Multiple-Input-Multiple-Output/Orthogonal Frequency Division...
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Whitepapers
Saturated Throughput of Burst Mode PCA with Hard DRPs in WiMedia MAC
March 11, 2008, 12:00am PDT
An analytical formulation of the saturated throughput of Burst Mode Prioritized Contention Access (PCA) with Hard Distributed Reservation Protocols (DRPs) and Beacon Period (BP) in WiMedia MAC is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Real-Time Algorithm for Long Range Signal Strength Prediction in Wireless Networks
March 11, 2008, 12:00am PDT
Prediction of rapidly time variant fading channel conditions enables adaptive data transmission in wireless systems, which in turn improves the quality of service for end users and reduces the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Performance Comparison of Routing Protocols for Maritime Wireless Mesh Networks
March 11, 2008, 12:00am PDT
The authors envisage coverage extension of the high bit rate terrestrial communication networks to the ships to reduce the cost in maritime communications. The coverage extension is achieved by...
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Whitepapers
Multichannel Wormhole Switching vs. CSMA/CA for Wireless Mesh Networking
March 11, 2008, 12:00am PDT
This paper presents a method for improving the performance of Wireless Mesh Networks (WMN) through the use of multichannel wormhole switching. Current WMNs based on contention-based Medium Access...
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Whitepapers
Towards an Architecture for Mobility Management and Resource Control
March 11, 2008, 12:00am PDT
In 4G networks, various wireless access technologies will be integrated into a heterogeneous network based on an IP core network infrastructure. Thus, numerous works focus on mobility and vertical...
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Whitepapers
Repeating or Relaying in Wireless Systems
March 11, 2008, 12:00am PDT
In this paper, the authors investigate delay diversity in Ricean fading channels implied by repeaters as a simple form of relay. They will outline the impact in broadcast and in mobile radio...
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Whitepapers
Effect of Frame Aggregation on the Throughput Performance of IEEE 802.11n
March 11, 2008, 12:00am PDT
The IEEE 802.11n standard aims at providing a data transmission rate of up to 600 Mbps. The frame aggregation techniques of IEEE 802.11n MAC layer play an important role in the enhancement of...
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Whitepapers
Uplink-Downlink SINR Duality via Lagrange Duality
March 11, 2008, 12:00am PDT
The uplink-downlink SINR duality theorem is key tools which simplify substantially the problem of joint design of the linear transmit and receive beam formers in Multiple-Input Multiple-Output...
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