But if above positive real condition is satisfied only within some frequency range, the convergence of FXLMS algorithm is dependent on the spreading of power spectral density of the reference signal.
若上述正实条件仅在某些频带上满足，则FXLMS算法的收敛将依赖于参考信号功率谱密度的分布。
2
Base_station USES finite number of space_time codes to spread, and small number of antennas to transmit and receive signal, thus TD_SCDMA mobile terminals can obtain maximal spreading gain.