Paper Info
Title
Bit and Power Loading for OFDM-Based Three-Node Relaying Communications
Abstract
Bit and power loading (BPL) techniques have been intensively investigated for the single-link communications. In this paper, we propose a margin-adaptive BPL approach for orthogonal frequency-division multiplexing (OFDM) systems assisted by a single cooperative relay. This orthogonal half-duplex relay operates either in the selection detection-and-forward (SDF) mode or in the amplify-and-forward (AF) mode. Maximum-ratio combining is employed at the destination to attain the achievable distributed spatial diversity-gain. Assuming perfect channel knowledge is available at all nodes, the proposed approach is to minimize the transmit-power consumption at the target throughput (average number of bits/symbol) and the target link performance. With respect to various power-constraint conditions, we investigate two distributed resource-allocation strategies, namely flexible power ratio (FLPR) and fixed power ratio (FIPR). The FLPR strategy is proposed for scenarios without individual local power constraint. The source power and relay power have a flexible ratio for each subcarrier. The FIPR strategy is proposed for scenarios with individual local power constraint. The source power and relay power have a fixed ratio for each subcarrier. Computer simulations are carried out to evaluate the proposed approach with respect to the relay location. Significant performance improvement is observed in terms of both the symbol-error-rate and the transmit-power efficiency.
Year
DOI
Venue
2008
10.1109/TSP.2008.920493
IEEE Transactions on Signal Processing
Keywords
Field
DocType
bit and power loading (bpl),flexible ratio,relaying communication,diversity reception,flexible power ratio,relay,spatial diversity-gain,orthogonal frequency-division multiplexing,fipr strategy,single-link communication,ofdm modulation,fixed ratio,ofdm-based three-node relaying communications,detection-and-forward,radio networks,fixed power ratio,source power,bit-and-power loading technique,selection detection-and-forward (sdf) mode,ofdm,orthogonal frequency-division multiplexing (ofdm),amplify-and-forward mode,power loading,maximum-ratio combining method,amplify-and-forward (af),margin-adaptive bpl approach,individual local power constraint,frequency division multiplexing,merging,throughput,power efficiency,orthogonal frequency division multiplexing,computer simulation,spatial diversity
Subcarrier,Antenna diversity,Telecommunications,Code rate,Control theory,Frequency-division multiplexing,Electronic engineering,Throughput,Multiplexing,Relay,Orthogonal frequency-division multiplexing,Mathematics
Journal
Volume
Issue
ISSN
56
7
1053-587X
Citations 
PageRank 
References 
38
1.70
17
Authors
3
Name
Order
Citations
PageRank
Yi Ma1946.68
Na Yi211914.89
R. Tafazolli32969346.10