基于连续干扰消除的超奈奎斯特信号迭代接收技术

SIC-based Iterative Reception Technique for Faster-than-Nyquist Signals

为了消除超奈奎斯特(FTN)调制技术引入的干扰,设计了基于连续干扰消除(SIC)的Turbo迭代均衡接收机。对于单载波FTN系统,首先建立了FTN信号等效模型,然后接收机根据等效模型和译码器输出的软信息重建干扰,并通过多次连续干扰消除和译码逐步消除,具有较低的复杂度。同样地,在多载波FTN系统中,根据译码器输出的软信息和成型脉冲的时频特性重建引入的干扰并通过多次迭代给予消除。仿真表明,在加速因子不是太小时,基于SIC-Turbo均衡的接收机能够有效消除干扰,可获得近似正交传输时的误码性能。

In order to eliminate the interference introduced by faster-than-Nyquist( FTN) modulation technique,a Turbo iterative equalization receiver based on successive interference cancellation( SIC) is designed. For single-carrier FTN system,the equivalent model of FTN signal is established firstly. And then according to the equivalent model and the soft information obtained from the decoder,the receiver reconstructs the interference and eliminates it with multiple SIC and decoding,and relatively low complexity is achieved. Likewise,the introduced interference is reconstructed and eliminated with many iterations in multi-carrier FTN system,according to the time-frequency characteristics of pulse filter and the soft information obtained from the decoder. Simulation shows that when the packing factor is not too small,receiver based on SIC-Turbo equalization can effectively eliminate the interference and acquire the bit error rate( BER) performance approximate to the orthogonal transmission mode.