| 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. |