摘要
分析并讨论了在不同多径衰落信道下,不同子载波分组对非精确信道信息条件下的子带自适应调制OFDM系统性能的影响;提出了一种基于信道信息误差准则的子载波分组算法,在保证系统频谱效率的同时,根据信道信息误差准则对OFDM系统的子载波进行动态分组。仿真结果表明:在典型城区信道下,OFDM系统的子载波可分为16-32个组,而农村环境下则只需分4个子载波组即可,从而大幅降低了系统的复杂度。
The performance of different grouping method is analysed for the sub-band adaptive modulation OFDM system with imperfect channel side information in different multi-path fading channel. A low complex sub-carrier grouping algorithm based on specified error of channel side information is proposed. The algorithm dynamically groups the sub-carrier of the OFDM system into several sub-bands with little loss of spectral efficiency. Simulation results show that in typical urban channel, the sub-carrier of OFDM system can be grouped into 16-32 sub-bands, and in rural channel only 4 sub-bands is needed. Thus, the complexity of the system is greatly reduced.
出处
《深圳职业技术学院学报》
CAS
2007年第1期1-3,10,共4页
Journal of Shenzhen Polytechnic
