A New Equalizer for Non-sinusodial HF Communication Based on Prolate Spheroidal Wave Function
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摘要: 针对基于椭圆球面波函数(Prolate Spheroidal Wave Function, PSWF)的非正弦通信技术在短波频段内受到多径时延，引起码间串扰导致系统可靠性下降的问题，在分析信道特性对基于PSWF 非正弦调制信号影响和非正弦通信的特殊性的基础上，通过对均衡思路的分析，设计了一种新的均衡方案。此方案首先将码间串扰对正交性的影响转化为对判决数据信号质量的影响。进而，针对每一路判决数据信号采取均衡措施，提高判决数据的质量。最后，依据判决准则进行判决。仿真结果表明这种新的均衡方案是有效的，在给定的仿真条件下，信噪比为24 dB时，误码率约从10-2改善到10-3；针对PSWF脉冲两种不同的生成方法(单波道脉冲生成方法和多波道脉冲生成方法)生成脉冲组的特性，在基本均衡方案的基础上提出了参数共享式均衡和分组参数共享式均衡两种方法，并在最后给出了仿真结果，证明了这两种方法的有效性。
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关键词:
- 短波通信 /
- 非正弦通信 /
- 均衡 /
- 椭圆球面波函数(PSWF)
Abstract: The multipath effects of the HF channel make the BER of non-sinusodial HF communication based on Prolate Spheroidal Wave Function (PSWF) increasing. An new equalizer scheme is proposed on the base of analysising the factors reducing the quality of decision dates and the particularity of the non-sinusodial communication systerm based on PSWF. This scheme transfer the effects of ISI to the quality of the decision date signals，and taking measures to equilibrium each path of decision date signals to improve its quality. Finally, the disicion will be made according to the judgement criterion. The results of the simulations show that the new equalizer is effective, and the BER can be reducing from 10-2 to 10-3, when the SNR is 24 dB. For the group of different characteristics of PSWF pulses which come from different pulse generating methods including constructing method of PSWF based on single-channel and constructing method of PSWF based on multi-channel, parameters shared equalizer and grouping parameters shared equalizer are put forwad. The results of the simulations show that: the two kinds of equalizers are effective. -
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