At last we use the same concept to construct a multilevel trellis coded modulation and space time coded modulation for noncoherent decoding based on QPSK and it can have a good error performance too.

• 最后，将多层次的概念建构以QPSk做调变，可适用非同调解码的篱栅编码调变与时空编码调变，一样可达到良好的错误效能。