Cyclic trellis coded modulation
    40.
    发明申请
    Cyclic trellis coded modulation 有权
    循环格状编码调制

    公开(公告)号:US20050254606A1

    公开(公告)日:2005-11-17

    申请号:US11087390

    申请日:2005-03-22

    申请人: Siavash Alamouti

    发明人: Siavash Alamouti

    IPC分类号: H03D1/00 H03M13/25 H04L1/00

    摘要: A universal method of trellis encoding signals mapped according to any signal constellation format involves constructing an encoder output table and a state transition table. The encoder output table defines the output symbol of an encoder given the input symbol and the present state of the encoder, while the state transition table defines the next state of the encoder given the present state of the encoder and the input applied to the encoder. The output table and the next state table are constructed with the objective of providing maximal distances between the branches of the trellis diagram without any regards for the shift register implementation of the code. Cyclic trellis coded modulation is an example of such codes without feed-forward or feed-back shift register implementations, and with equal or better performance than “optimal” shift register trellis codes with 16 states or less. The cyclic trellis codes for both AWGN and Rayleigh fading applications can be constructed for any signal constellation without resorting to exhaustive searches.

    摘要翻译: 根据任何信号星座图格式映射的网格编码信号的通用方法涉及构造编码器输出表和状态转换表。 编码器输出表定义了给定输入符号的编码器的输出符号和编码器的当前状态,而状态转换表定义了给定编码器当前状态的编码器的下一个状态以及应用于编码器的输入。 输出表和下一个状态表的目的是提供格状图的分支之间的最大距离,而不用考虑代码的移位寄存器实现。 循环格状编码调制是不具有前馈或反馈移位寄存器实现的这种代码的示例,并且具有与具有16个状态或更少的状态的“最佳”移位寄存器格状码相同或更好的性能。 可以为任何信号星座构建AWGN和瑞利衰落应用的循环格码,而不需要彻底搜索。