Title | Rate-Adaptive Bit and Power Loading for OFDM Based DF Relaying |
Authors | Na Yi, Yi Ma, Rahim tafazolli |
Journal/Conference name | VTC 2008 Spring |
Date of Publication | 11-14 May 2008 |
Work Area | Delivery Efficiency |
Abstract | In this paper, we investigate the adaptive bit and power loading approach for the OFDM-based relaying communications. The relaying protocol is half-duplex outage symbol-level-selection detection-and-forward. The source and the relay has the separate power constraints. The maximum-ratio combining is employed at the destination to achieve the maximum distributed spatial diversity-gain. Assuming the perfect channel knowledge available at all nodes, we propose a sub-optimum rate-adaptive bit and power loading approach to maximize the number of bits/symbol at the target link performance. Comparing with the optimum water-filling approach,the proposed approach offers lower complexity for implementation as well as the integer number of bits/symbol. Computer simulations are used to examine the proposed approach for various scenarios with respect to the relay location and the distributed power allocation. |