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technique
(23150 results)-
White Papers
On the Diversity-Multiplexing Tradeoff for Multi-Antenna Multi-Relay Channels
June 1, 2007 12:00am PDT
In this paper, the authors analyze the performance of multiple relay channels when multiple antennas are deployed only at relays. Specifically, they investigate the simple repetition-coded...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Performance Analysis of Cooperative Diversity Using Equal Gain Combining (EGC) Technique Over Rayleigh Fading Channels
June 1, 2007 12:00am PDT
Cooperative diversiy is a promising technology for future wireless networks. In this paper, based on the Moment Generating Function (MGF), the authors derive exact closed-form expressions for the...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A New MIMO Beamforming Technique Based on Rotation Transformations
June 1, 2007 12:00am PDT
In this paper, the authors propose a new transmit beam-forming technique for Multiple-Input-Multiple-Output (MIMO) systems to improve the link level performance. They present a method for...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
User Selection for SDMA Beamforming With Imperfect CSI in MIMO-OFDM Systems
June 1, 2007 12:00am PDT
Transmit1 Space Division Multiple Access (SDMA) with linear transmit filters has been studied as a low-complexity technique for transmitting simultaneously (in the same timefrequency slot) to...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Opportunistic Spectrum Multichannel OFDMA
June 1, 2007 12:00am PDT
Opportunistic Spectrum Access (OSA) is being seriously considered for the future spectrum needs. In this paper, the authors propose a simple and effective multichannel multiple access technique...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
A Frequency Diversity Technique for Interference Mitigation in Coexisting Bluetooth and WLAN
June 1, 2007 12:00am PDT
Co-channel interference has become an important problem with the increasing deployment of wireless networks in the unlicensed frequency band. Most existing schemes aim to avoid collisions on...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Evaluation of Security for DSSS Under Repeater Jamming
June 1, 2007 12:00am PDT
Direct Sequence Spread Spectrum (DSSS) technique has been widely used in both military communications and commercial communications. On the other hand, it is a challenge to both frequency...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Performance Evaluation of Middleware for Provisioning LBS in Cellular Networks
June 1, 2007 12:00am PDT
Location systems based on already-deployed cellular networks spend the resources of the underlying communications network. This paper proposes a middleware that reduces the consumption of...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
An Energy-Aware Multi-Hop Tree Scatternet for Bluetooth Networks
June 1, 2007 12:00am PDT
Bluetooth is an enabling technology used to construct personal area networks. Since Bluetooth devices are usually energy-constrained, a critical issue for Bluetooth networks (or scatternets) is to...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
An Experimental Design Approach for Optimizing SMSE Waveforms to Minimize Coexistent Interference
June 1, 2007 12:00am PDT
An experimental design approach is used to determine which factors (design parameters) of Spectrally Modulated, Spectrally Encoded (SMSE) waveforms have the greatest impact on coexistence with...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Asynchronous Co-Channel Interference Suppression in MIMO OFDM Systems
June 1, 2007 12:00am PDT
The authors present algorithms to suppress the asynchronous Co-Channel Interference (CCI) in MIMO OFDM systems, which is becoming the dominant limiting factor in the performance of the emerging...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Impact of Sampling Jitter on Mostly-Digital Architectures for UWB Bio-Medical Applications
June 1, 2007 12:00am PDT
Ultra-WideBand (UWB) impulse radio is a promising technique for low-power bio-medical communication systems. While a range of analog and digital UWB architectures exist, the mostly-digital...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
UWB Based Positioning in Multipath Channels: CRBs for AOA and for Hybrid TOA-AOA Based Methods
June 1, 2007 12:00am PDT
In this paper, the authors consider UWB (Ultra Wide Band) based positioning. They derive the CRBs (Cramer Rao bound) for AOA (angle of arrival) and for hybrid method using both AOA and TOA (time...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Improved Revenue and Radio Resource Usage Through Inter-Operator Joint Radio Resource Management
June 1, 2007 12:00am PDT
This paper proposes a two-layer Joint Radio Resource Management (JRRM) framework to improve the efficiency in multi-radio and multi-operator cellular scenarios. On the one hand, the intra-operator...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Characterization of an Indoor MIMO Channel in Frequency Domain Using the 3D-SAGE Algorithm
June 1, 2007 12:00am PDT
In this paper, the Frequency Domain (FD) SAGE (Space-Alternating Generalized Expectation-maximization) algorithm has been extended to the MIMO case in order to determine the angular and temporal...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Capacity and Coverage of Reverse Link DS/CDMA Cellular Systems With MIMO Implementations
June 1, 2007 12:00am PDT
This paper investigates the impact of Multiple-Input Multiple-Output (MIMO) implementations on both capacity and coverage of reverse link Direct Spread/Code Division Multiple Access (DS/CDMA)...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Lower Bounds on the Capacity Regions of the Relay Channel and the Cooperative Relay-Broadcast Channel With Non-Causal Side Information
June 1, 2007 12:00am PDT
Channels that depend on random parameters received considerable attention over the last years, due to a wide range of possible applications. Two examples of such channels are the Broadcast Channel...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
An Improved Joint M-Algorithm for Single Antenna Interference Cancellation in TDMA Mobile Radio
June 1, 2007 12:00am PDT
The authors target M-ary data sequence estimation over time-variant frequency selective fading channels subject to CoChannel Interference (CCI). A novel joint reduced state sequence estimator is...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Bandwidth-Efficient Byte Stuffing
June 1, 2007 12:00am PDT
Byte stuffing is a technique to allow the transparent transmission of arbitrary sequences with constrained sequences. To date, most of the existing algorithms, such as PPP, attain a low average...
Provided by: Institute of Electrical and Electronics Engineers
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White Papers
Detecting HTTP Tunnels With Statistical Mechanisms
June 1, 2007 12:00am PDT
Application Level Gateways and firewalls are commonly used to enforce security policies at network boundaries, especially in large-sized business networks. However, several mechanisms can be used...
Provided by: Institute of Electrical and Electronics Engineers
