一种多载波CDMA的子信道分配策略

A Subchannel Allocation Policy of Multicarrier CDMA

为了获得高速、高质量的无线数据通信 ,增强多载波CDMA抗多址干扰和信道衰落能力 ,提出了一种子载波分配与功率分配相结合的信道分配策略。根据不同子载波上衰落幅度的不同 ,选择性地传输信息 ,对于衰落幅度较大的子载波不分配信号能量 ,将其信号能量分配到传输信号的子载波上 ,能有效地减小多址干扰 ,同时又能获得较大的分集增益。这种基于子载波衰落幅度的分配策略与其它文献报道方案比较 ,具有较低的计算量与较好的收敛性 ,是一种工程可实现性方案。

To attain high rate data and high quality of service in wireless communication, a subchannel allocation policy combined with subcarriers and power allocation is proposed. In the proposed system, instead of identical power over the subcarriers in parallel, each user's DS waveform is transmitted over the subchannels that have large fading amplitude among all the subchannels. The powers of the subcarriers with small fading amplitude are allocated to the subcarriers with large ones. It can effectively suppress multiple-access interference while obtaining diversity gains. The allocation policy based on fading amplitudes has the advantages of low computation and good convergence compared with the policy proposed in other papers. Thus, it is suitable for engineering.