一种结合相移分集技术的空频编码技术

A Space-Frequency Coding Technique Combined with Phase Shift Diversity

在第三代移动通信系统中,空频编码技术是抗信道衰落和提高系统容量的一种新的编码方法。但是,随着发射天线数目的增加,存在编码速率不能达到1,且译码比较复杂的问题。为了解决这两个问题,在介绍简单空频分组编码原理的基础上,针对四根发射天线,提出了一种结合一般的空频编码技术与相移分集技术的空频编码方法,编码速率可以达到1,译码采用简单的最大似然译码,算法得到了简化。在瑞利衰落信道条件下对其进行了仿真,仿真结果表明,提高了信号传输的可靠性,性能优于一般的空频编码方法,是适合移动通信的一种可靠的编码技术。

Space-frequency coding technique is a new coding technique which can combat with channel attenuation,obtain diversity gain against fading and enhance the capacity in 3G wireless communication.But with the increase of the number of transmit antennas,the code rate can＇t reach 1,and decoding is complex.To solve the two problems,based on the theory of space-frequency coding,a method is proposed combining the space-frequency coding technology with phase shift diversity technology for four transmit antennas.The code rate of which can reach 1 and decoding is simplified.The experiment results in Rayleigh fading channels showes that this method enhances the performance of the system and is better than other general space-frequency coding.It is a reliable coding adapted to wireless communication.