一种用户级多波束卫星系统预编码算法  

A Precoding Algorithm for Multi-beam Satellite Systems at User Level

作　　者：陶凯 孙哲 TAO Kai;SUN Zhe(The 54th Research Institute of CETC,Shijiazhuang 050081,China;Military Representative Office of Navy in Handan,Handan 056000,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]海军驻邯郸地区军事代表室,河北邯郸056000

出　　处：《无线电工程》2020年第7期549-553,共5页Radio Engineering

摘　　要：预编码可有效提升多波束卫星多输入多输出(Multiple-Input Multiple-Output,MIMO)系统的吞吐量。针对已有多用户MIMO系统的信漏躁比(Signal-to-Leakage-and-Noise Ratio,SLNR)/连续信漏噪比(Successive Signal-to-Leakage-Plus-Noise Ratio,SSLNR)相关预编码算法中,用户码流之间增益差较大,算法误比特率(Bit Error Rate,BER)性能损失的问题,将全频率复用多波束卫星系统建模为卫星MIMO系统,并结合其信道特点,基于PA-SSLNR算法提出了基于用户级的预编码算法——US-SSLNR算法。基于用户间距进行分组,组内每个用户独立进行SSLNR运算,从而有效降低码流间的增益差,并采用THP方法在发端抵消掉已知的组间干扰泄漏。优势在于在矩阵运算过程中充分利用多波束卫星系统信道特点减小预处理矩阵的维度。分析表明,相比SSLNR-THP及PA-SSLNR算法,有效降低了运算复杂度。仿真结果表明,算法有效提高了误码性能。Precoding algorithm can improve the throughput of multi-beam satellite MIMO system.The existing precoding algorithms for multi-user MIMO system are all with loss of BER because of the lager gain difference among the data streams.A multi-beam satellite system with full frequency multiplex is modeled as a MIMO system,and a new precoding algorithm named US-SSLNR is proposed based on PA-SSLNR algorithm for multi-beam satellite MIMO system.Firstly,the users are grouped based on the distance between them.Secondly,each user calculates its SSLNR value independently,which can reduce the gain difference among the data streams.And then,the known leaking interference of the transmitter is offset by using the THP algorithm.The advantage is that the characteristic of multi-beam satellite system is exploited to reduce the dimension of the preprocessing matrix.The analysis results show that as compared with SSLNR-THP and PA-SSLNR,the proposed algorithm reduces the calculation complexity.The simulation results show that as compared with SSLNR-THP,the proposed algorithm improves the BER performance.

关 键 词：卫星通信 多波束多输入多输出 用户级 连续信漏噪比 低误比特率 

分 类 号：TN927.2[电子电信—通信与信息系统]