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unified communications
(35919 results)-
Whitepapers
Joint Optimization of Iterative Source and Channel Decoding Using Over-Complete Source-Mapping
August 20, 2007 12:00am PDT
The intentionally imposed or inherent unintentional residual redundancy found in source encoded bit-streams can be exploited for supporting joint Soft-Bit-Source Decoding and Channel Decoding,...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Direct Time-Domain Channel Impulse Response Estimation for OFDM-Based Systems
August 20, 2007 12:00am PDT
A method to estimate the channel impulse response using the received serial data in time-domain, without using DFT operations, is investigated. The processing required by the proposed method is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Iterative Phase Noise Mitigation in MIMO-OFDM Systems With Pilot Aided Channel Estimation
August 20, 2007 12:00am PDT
The use of multiple transmit and receive antennas in combination with multicarrier modulation, e.g. MIMO-OFDM, is a very promising technique for future wireless communication systems. In this...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Throughput Analysis of TDMA System Forward Link Packet Data Transmission With Superposition Coding
August 20, 2007 12:00am PDT
Superposition coding can be used to improve capacity of communications in a variety of scenarios. This paper is concerned with the application of superposition coding in TDMA system forward link...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Decision-Feedback Detection for Free-Space Optical Communications
August 20, 2007 12:00am PDT
Free-Space Optics (FSO) have received increased attention recently for last-mile wireless links. In this paper, the authors investigate non-coherent detection, i.e., detection assuming the absence...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Rake Performance After Channel Shortening by Decay Factor Optimization in UWB Channels
August 20, 2007 12:00am PDT
In this paper, the authors present a novel channel shortening algorithm developed in particular for Ultra WideBand (UWB) communication systems. This algorithm makes use of exponentially decaying...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Improved Estimation of the Ricean K Factor From I/Q Samples
August 20, 2007 12:00am PDT
Knowledge of the Ricean K factor is important in many communication applications as it reveals the fading severity experienced by a wireless receiver. In this paper, a statistical analysis of the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Decimation-in-Time FFT Subblocking for Partial Transmit Sequence OFDM
August 20, 2007 12:00am PDT
The authors consider an IFFT-based technique for reducing the Peak-to-Average Power Ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal. The intermediate signals in a radix...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
PAPR Reduction Method Using Clipping and Peak-Windowing in CI/OFDM System
August 20, 2007 12:00am PDT
OFDM (Orthogonal Frequency Division Multiplexing) is one of the most promising technologies for next-generation high-speed mobile communications. However, it has a high PAPR (Peak-to Average Power...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Joint Channel Tracking and Symbol Detection for MIMO-OFDM Mobile Communications
August 20, 2007 12:00am PDT
In this paper, a new joint channel tracking and symbol detection algorithm is proposed for MIMO-OFDM systems over the time-varying frequency-selective fading channel. The iterative...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Successive Maximum Likelihood Estimation for Time and Frequency Synchronization
August 20, 2007 12:00am PDT
A new repetitive synchronization signal structure is proposed for wireless communication systems. A corresponding successive maximum likelihood detection algorithm that uses the proposed...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Data Quantity for Reliable Traffic Information in Vehicular Ad Hoc Networks
August 20, 2007 12:00am PDT
Vehicular Ad hoc NETworks (VANETs) are promising platforms from which decentralized traffic information systems can be built. In VANETs, susceptible situations, such as communication disruptions...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Evaluation of 802.16e in Vehicle to Vehicle Channels
August 20, 2007 12:00am PDT
Vehicle-To-Vehicle (V2V) communications have drawn much attention in the past few years. The IEEE 802.16e standard systems can be considered potential candidates for these applications due to...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Multi-User, Time-Reversal UWB Communication for Railway Systems
August 20, 2007 12:00am PDT
In this paper, the authors propose to apply Time Reversal (TR) technique and UWB radio technology for railway signalization systems. UWB technology has the potential to offer simultaneous...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Development of Digital Train Radio System in Tokyo Metropolitan Area
August 20, 2007 12:00am PDT
Train radio systems for conventional lines have supported safe and stable railway transportation since 1986, and have made it possible for dispatchers and crews to communicate with an independent...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
ICT Anti Collision Radar for Road Traffic
August 20, 2007 12:00am PDT
The ICT radar is an information - communication technology system for early warning and collision avoidance on roads and motorways. This radar uses special sensor network, which - spanned over the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
The Spatial Reuse Slot Allocation With Reallocating Neighbor Links in the TDMA-Based Wireless Mesh Network
August 20, 2007 12:00am PDT
With the wide spread of broadband wireless communication devices such as wireless LAN and UWB, the wireless mesh network becomes common. As the mobile terminal's ability is getting advance in...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Two-Step Vertical Handoff Algorithm in Heterogeneous Traffic and Systems
August 20, 2007 12:00am PDT
Vertical handoff is a switching process for seamless communication between heterogeneous wireless networks. By applying pre-handoff concept for the heterogeneous traffic, the authors propose a...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Multi-Satellite DVB-RCS System With RCST Based on Software Defined Radio
August 20, 2007 12:00am PDT
Multi-mode satellite terminals are actually the most desired devices on the market, thanks to their flexibility and suitability. A multi-mode radio communication terminal is a terminal allowing...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Intra-Cell Frequency Reuse Plan for Triangular Cell Communication System
August 20, 2007 12:00am PDT
Triangular Cell Communication System (TCCS) is a novel distributed system, which allows a capacity improvement in addition to coverage improvements. This paper proposes a frequency reuse plan for...
Provided by: Institute of Electrical & Electronic Engineers
