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在MIMO系统中,酉阵主要应用于差分空时调制(DUSTM)及有限反馈预编码两个方面。DUSTM主要应用于无法获得信道状态参数(CSI)情况下,而有限反馈预编码则应用于完全或部分可获得CSI情况下。文中提出了一种基于实型“频率”系数的遗传搜索方法,即使在系统维数很大的情况下,运用该方法获得酉阵设计的码字性能优于由整型“频率”系数穷举搜索而获得的码字。
In the MIMO system, the unitary array is mainly used in two aspects: differential space-time modulation (DUSTM) and limited feedback precoding. DUSTM is mainly applied in the case that channel state parameters (CSI) can not be obtained, and limited feedback precoding is applied in the case of CSI obtainable completely or partially. In this paper, a genetic search method based on real-type “frequency” coefficients is proposed. Even in the case of a large number of system dimensions, the codeword performance obtained by using this method is superior to that obtained by integer “frequency ”The code is obtained by exhaustive search of coefficients.