新型的基于m序列的复数训练序列生成方法

Novel scheme for generating poly-phase sequence based on m-sequence

为了构造任意长度的均衡训练序列或码字、满足单载波频域均衡(SC-FDE)同步和均衡需要具有时域高自相关性和频域平坦性的均衡训练序列或扩频码的需求,提出了一种基于m序列、离散傅里叶变换(DFT)和逆离散傅里叶变换(IDFT)的复数训练序列构造方法.该方法对原始m序列的频域序列进行修正和扩展,得到期望点数的序列,之后变换回时域,形成复数序列.这样构造的序列不仅具有良好的幅频响应平坦度和时域自相关性,而且对量化比特数要求不高,可以作为SC-FDE调制系统的均衡训练序列和多相扩频码.

The training sequence with arbitrary length was demanded for good auto-correlation property and flat magnitude in frequency domain for synchronization and equalization in single carrier frequency domain equalization （SC-FDE） system. A novel scheme based on m-sequence, discrete Fourier transform （DFT） and inverse discrete Fourier transform （IDFT） was proposed to generate poly-phase sequence. The scheme remedied and expanded the sequence in frequency domain to get the sequence with demanded length, hence transformed it back into time domain to get the complex sequence. The complex sequence has good auto correlation property, flat magnitude in frequency domain and short quantified bits, thus can be applied in SC-FDE system as both equalization training sequence and poly-phase spread spectrum sequence.