基于DSP的低复杂度数字电视接收机频域均衡器

DSP-based Low Complexity Frequency Domain Equalizer for Digital TV Receiver

基于DSP的数字电视频域均衡需要大量的复数除法,给接收机的实现带来了巨大的困难。对此提出了一种基于DSP低复杂度的,兼容单、多载波的DTMB接收机频域均衡器。该均衡器先将复数除法转换为实数除法,再对除数进行PCM A-Law和μ-Law压缩编码,然后以压缩编码后的码字作为索引进行查表,得到除数的倒数,最后通过乘法实现频域均衡器。仿真结果表明,提出的基于DSP的频域均衡方法,存储空间较少,消耗的指令周期数较少,运算速度快,同时性能较高。

There is a great mass of complex divisions in the frequency domain equalizer, which is a challenge tor the D5V-based receiver. In this pa- per, a DSP-based low complexity frequency domain equalizer for the DTMB receivers is presented. The division in the equalizer is first transformed into real division. Then the divisors are compressed using PCM A-Law or Ix-Law. At last, a compressed table is used to find the reciprocals of the divisors. In this way, a simple equalizer is implemented by multiplying the reciprocals. The simulation results indicate that the algorithm can reduce the memory space and running time with little performance loss.