| Abstract |
In this paper, we propose a rate-adaptive bit and power loading
approach for the OFDM based relaying communications. The cooperative
relay operates in the half-duplex amplify-and-forward mode. Both the
sender and the relay has the separate power constraints. Unlike the
water-filling method, the proposed approach does not need the
iterative loading process. It can maximize the throughput (the
number of bits/symbol) with the given power and achieve the target
link performance. Computer simulations are used to examine the
proposed approach for two cases with respect to the relay location.
In Case I, sender, relay and destination have the same distance.
In Case II, the relay is placed near the sender. It is found that
the number of bit/symbol in Case I is higher than in Case II. |