VHF频段高速率无线数据传输系统中多进制CPM调制解调算法的实现
首发时间:2014-11-26
摘要:本文研究在甚高频(Very High Frequency,VHF)频段采用多进制连续相位调制(Continuous Phase Modulation,CPM)实现高速率无线数据传输的系统方案。最优的CPM检测方法是最大似然序列检测,但随着关联长度L(脉冲成形滤波器的持续时间)、调制阶数M的增大,算法复杂度呈指数增长,在高斯信道下基于劳伦特分解的次优检测算法,不仅减少了匹配滤波器的个数,而且减少了网格图的状态,降低了复杂度。当信道存在符号间干扰(Inter Symbol Interference,ISI)特性时,均衡时复杂度会进一步增加,该文分析了基于最大似然序列估计算法(Maximum Likelihood Sequence Estimation,MLSE)的全状态检测算法,以及基于劳伦特分解的次优算法。在本文中我们还对比了基于CPM调制的方案与前期实现的GMSK调制和同频双路GMSK系统的性能。?????
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Research of modulation and demodulation based on M-ary CPM in wireless high speed data transmission system operated on VHF band
Abstract: We research the wireless data communication system in the VHF(Very high frequency) band based on CPM(Continuous Phase Modulation) signal.The optimal detection of CPM is maximum likelihood sequence detection, but with the increase of L, M, algorithmic complexity is exponential. Under Gaussian channel the suboptimal detection algorithm based on decomposition of Laurent, not only reduces the number of matched filter, but also reduces the state grid, and the complexity.When the channel has the ISI properties, the complexity will increase further. The paper analyzes the full state detection algorithm based on MLSE, as well as the suboptimal algorithm based on the decomposition of Laurent.?We also compare the performance of the current CPM communication with the single and the same frequency dual GMSK communication system.?????
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No.4618408990587141****
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