关键词: 协同通信, 差分酉调制, 分集增益, 分组编码

Abstract:

A differential transmit scheme based on multiplerelay cooperating is proposed in broadband communication environment. By exploiting several technologies including differential unitary modulation, amplifyandforward and maximum ratio combining, the scheme can acquire full spatial and frequency diversity gains in the manner of decoupling. Compared to the differential spacefrequency block codes, the proposed scheme not only reduces coding and decoding complexity but also easyly adjusts diversity gain. In addition, it can acquire higher spatial and frequency diversity gains with the same relay node numbers and block length. Simulation consists with theoretical analysis.

Key words: cooperative communication, differential unitary modulation, diversity gain;block coding