基于多载波和码片交织技术的无线通信新方案

正交频分复用（OFDM）技术和交织分多址（IDMA）接入技术被认为是适于下一代无线移动通信的关键技术。建立了一种基于多载波和码片交织技术的OFDM-IDMA上行链路系统模型，该系统在发送端采用码片级交织，在接收端采用一种简单的Turbo型迭代结构。随后分析了该系统在AWGN信道下的性能，并和具有相似结构的OFDM-CDMA在多径信道下进行仿真比较。结果表明：在高斯单径信道下，随着信噪比的增加，该系统的多用户曲线会向单用户靠拢，而在多径信道下，系统表现出比OFDM-CDMA更优的多用户性能。

Novel wireless communication scheme based on multi-carrier and chip interleave

Orthogonal frequency division multiplexing (OFDM) and interleave division multiple access (IDMA) are considered as the key techniques of the next generation wireless mobile communications. On the basis of multi-carrier and chip interleave, an OFDM-IDMA uplink scheme is presented. This system adopts a chip-level interleaving method at the transmitter and a simple turbo iterative structure at receiver. Then performance analysis of this system and comparison with OFDM-CDMA have been done in AWGN and multi path channels respectively. The results demonstrate that the performance curves of multi user of an OFDM-IDMA system converge to that of single user when SNR increases in AWGN single path channel, and the multi user's performance of this system is better than that of OFDM CDMA in multi path channels.