频率选择MIMO信道多用户块传输SCFDE系统的联合波束成形

摘要

Single carrier frequency domain equalization (SCFDE) joint beamforming in frequency selective multiple input multiple output (MIMO) channels under the multi-user scenario was analyzed. Firstly, the frequency domain beam-forming was transformed to a time domain filtering beamforming. By using the time domain model, the signal to interference plus noise (SINR) expression of every receiver at the decision point was shown after the frequency domain minimum mean square error (MMSE) equalization. Under a given quality of service (QoS) constraint of every receiver, the optimal beamforming coefficients minimizing the total transmitted power from all transmitters were found through solving a convex semidefinite programming (SDP) problem relaxed from a nonconvex quadratically constrained quadratic programming (QCQP) problem. Simulation demonstrates that the total transmitted power from all transmitters varies regularly with different settings deployed by the model.%对频率选择多入多出信道多用户场景下块传输单载波频域均衡系统联合波束成形的问题进行了研究.首先将频域波束成形转化为时域成形滤波.在时域模型中给出了频域最小均方误差均衡后各接收节点判决处的信干噪比;在使每个接收节点都满足给定服务质量要求的约束下,将非凸的二阶约束二次优化问题通过松弛约束条件转化为凸半正定优化问题求解,从而得到一组最佳波束成形系数,使所有发射节点的发射功率最小化.仿真表明所有发射节点的总发射功率随模型不同设置表现有规律地变化.