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多波束卫星系统中低复杂度预编码技术

DOI: 10.13190/j.jbupt.2015.01.019, PP. 97-102

Keywords: 卫星通信,多波束,预编码,格基约减

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Abstract:

针对减格辅助Tomlinson-Harashima预编码(LRA-THP)算法复杂度高的问题,提出一种适用于多波束卫星系统的低复杂度预编码算法.该算法根据用户间的距离对用户进行分组,然后利用矩阵求逆及正交三角分解(QR)计算预处理矩阵,用于抑制分组间干扰.计算过程中充分利用多波束卫星系统特点,减小预处理矩阵的维度,从而进一步降低算法运算量.各分组内分别采用LRA-THP,消除残留用户间干扰.仿真结果表明,相比LRA-THP,该算法的运算复杂度能降低92.5%,同时性能损失控制在0.2dB.另外,该算法能获得与已有的分组预编码算法相近的误码性能,同时使运算量降低69.7%.该算法的低复杂度及灵活性使其具有较强的实用价值.

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