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(34691 results)-
Whitepapers
Multi-Hop Relaying and MIMO Techniques in Cellular Systems - Throughput Achievable on Rayleigh/Ricean Channels
October 29, 2008 12:00am PDT
Two very important and active areas of wireless research are multi-hop relaying and multiple antenna techniques. Wireless multi-hop relaying, adopted in emerging standards such as 802.16j, can...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Cooperative Multiplexing in Full-Duplex Multi-Antenna Relay Networks
October 29, 2008 12:00am PDT
Consider a network with one source, one destination and multiple relays. It is shown that multiplexing gains that are higher than that of the direct link are possible for any finite SNR, in such a...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Multiple Antenna Assisted Hard Versus Soft Decoding-And-Forwarding for Network Coding Aided Relaying Systems
October 29, 2008 12:00am PDT
In this paper, the authors propose two types of new decoding algorithms for a Network Coding aided Relaying (NCR) system, which adopts multiple antennas at both the transmitter and receiver. They...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Improvement on LDPC Coded Queued Codes
October 29, 2008 12:00am PDT
The queued-code based on Low-Density Parity-Check (LDPC) codes, which exploit both the near Shannon-limit performance LDPC codes and the instantaneous Channel State Information (CSI), can provide...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Enhanced Verification-Based Decoding for Packet-Based LDPC Codes Over Wireless Channels
October 29, 2008 12:00am PDT
In this paper, the authors apply the Enhanced Verification-based decoding Algorithm (EVA) for packet-based LDPC codes over wireless channels. Compared with the Verification Algorithm (VA) in the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of Regular Low Density Parity Check Codes Over Hybrid Optical/RF Channels
October 29, 2008 12:00am PDT
A hybrid channel, consisting of a Free Space Optical (FSO) link and a parallel Radio Frequency (RF) link, is considered. Information bits are first encoded by a Low Density Parity Check (LDPC)...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Virtual Channel Based LLR Calculation for LDPC Coded SC-FDE System in 60-GHz WPAN
October 29, 2008 12:00am PDT
To deal with the multi-path delay spread in Non-Line-Of-Sight (NLOS) environments, Single-Carrier Frequency-Domain Equalization (SC-FDE), a.k.a., Single-Carrier Block Transmission (SCBT), is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Near-Capacity Iteratively Decoded Binary Self-Concatenated Code Design Using EXIT Charts
October 29, 2008 12:00am PDT
In this paper, Extrinsic Information Transfer (EXIT) charts are used to design binary SElf-Concatenated Convolutional Codes employing Iterative Decoding (SECCC-ID) for communicating over both...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Rank Prediction Method for the Multistage Wiener Filter Used for Interference Mitigation in CDMA Systems
October 29, 2008 12:00am PDT
The Multistage Wiener filter (MWF) is an efficient technique for interference mitigation in CDMA systems. A limitation to its implementation, however, is that poor rank selection causes...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Efficient Feasibility Examination for Successive Interference Cancellation in DS-CDMA Systems
October 29, 2008 12:00am PDT
On the uplink of a DS-CDMA system, Successive Interference Cancellation (SIC) technique can be employed to reduce multiple access interference and improve system capacity. In such a system with K...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Joint Codeword and Power Adaptation for CDMA Systems With Multipath and QoS Requirements
October 29, 2008 12:00am PDT
In this paper, the authors present an algorithm for joint codeword and power adaptation applicable in the uplink of a Code Division Multiple Access (CDMA) system in which multipath channels...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Data-Driven Code-Hopping for MC-CDMA Precoding Schemes
October 29, 2008 12:00am PDT
A novel code optimization scheme is presented for the downlink of MultiCarrier Code Division Multiple Access (MCCDMA) systems employing Phase Shift Keying (PSK) modulation. The optimization is...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of Iterative Multiuser Detection With Channel Estimation for MC-IDMA and Comparison With Chip-Interleaved MC-CDMA
October 29, 2008 12:00am PDT
This paper applies iterative multiuser detection employing new channel estimation to MultiCarrier InterLeave Division Multiple Access (MC-IDMA), known as OFDM-IDMA, which is expected to improve...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Step Size Optimization for Fixed Step Closed Loop Power Control on WCDMA High Altitude Platforms (HAPs) Channel
October 29, 2008 12:00am PDT
This paper evaluates fixed step algorithm of closed loop power control and investigates an optimum step size for WCDMA communication employing High Altitude Platforms (HAPs). In CDMA, power...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
An Efficient Tree Search for Reduced Complexity Sphere Decoding
October 29, 2008 12:00am PDT
The complexity of Sphere Decoding (SD) has been widely studied due to the importance of this algorithm in obtaining the optimal Maximum Likelihood (ML) performance with lower complexity. In this...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
K-Best Sphere Detection for the Sphere Packing Modulation Aided SDMA/OFDM Uplink
October 29, 2008 12:00am PDT
Recently, the turbo-detected Sphere Packing (SP) aided Space-Time Block-Coding (STBC) STBC-SP scheme was demonstrated to provide useful performance improvements over conventionally-modulated...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
MMSE Based Preprocessing and Its Variations for Closest Point Search
October 29, 2008 12:00am PDT
The Sphere Decoding (SD) is a category of algorithms finding the closest lattice point and known to have the expected complexity approximately cubic in the dimension of the lattice point to be...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
A Maximum-Likelihood Decoder With a New Reduction Strategy for MIMO Channel Systems
October 29, 2008 12:00am PDT
An efficient maximum-likelihood decoder with a new reduction strategy is proposed for linear MIMO channel systems. Unlike the current reduction strategies which only reorder the columns of the...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
Enhanced Soft Interference Cancellation Algorithm for V-BLAST Systems
October 29, 2008 12:00am PDT
In this paper, the authors investigate soft interference cancellation algorithms for Vertical Bell laboratories LAyered Space-Time (V-BLAST) systems. By using Gaussian-forcing technique and fast...
Provided by: Institute of Electrical & Electronic Engineers
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Whitepapers
On Optimal Power Allocation for Source-Orthogonal Relay-Non-orthogonal Amplify-and-Forward Relaying
October 29, 2008 12:00am PDT
An Amplify-and-Forward relaying network where the Source is Orthogonal to all the Relays but the relays are Non-orthogonal (SORNAF) is studied. The problem of relay power optimization in a SORNAF...
Provided by: Institute of Electrical & Electronic Engineers
