A Study on Controlling Transmission Power of OFDM Carriers Combined with Data Symbol Spreading using Optimal Data Reconstruction

摘要

We have already proposed joint optimization data spread OFDM transmission combined with carrier power control that makes it possible to improve the bit error rate characteristic. However, by using data spreading, the performance under low carrier to noise ratio degrades. In order to solve this problem, combination of carrier transmission power control scheme and data symbol spreading using optimal data reconstruction is proposed. In the proposed system, an MMSE equalization scheme is used instead of Zero-Forcing equalization scheme. As the results of computer simulations, it is confirmed that the proposed system can improve the bit error rate characteristics under multi-path channel.