不同速率的多用户MC-CDMA等效子载波分配算法研究

针对煤矿井巷通信环境,文中基于灌水原理提出能够满足不同速率需求的多用户MC-CDMA等效子载波分配算法,并建立系统模型,分析了算法的收敛性、多用户服务质量和系统的误码性能。仿真结果表明:该算法不仅能够保证每个等效子载波上用户数接近相等,对于随机特征使同道干扰达到最小,而且可以实现每个用户按照速率的大小有选择地占用一个或多个等效子载波;与随机等效子载波分配系统相比,在平均误码率为10-4时,系统大约可提供2 dB的信噪比增益。

Equivalent sub-carrier allocation algorithm for different rates of multi-user MC - CDMA system

For the communications environment ot mine roadway, tins paper put forward an equivalen sub-carrier allocation algorithm based on water-filling principle, which could fulfill the different rates of multi-user MC - CDMA system, then, built the system model and analyzed convergence of the algorithm and quality of service and performance of the system. The simulation results show that： The algorithm can not only ensure that the number of users on each equivalent sub-carrier is nearly equal, by that way, co-channel interference is the least, given the condition that the random signature sequences are used, but also can achieve that every user choose one or more equivalent sub-cartier according to the user＇s rate. Compared to random equivalent sub-carrier allocation system, this algorithm can provide 2dB SNR gain when average error rate is 10^-4