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在下一代移动通信中, 天线数和移动速度的增加都将导致实时信道估计难以实现. 因而能避免信道估计的差分空时调制(DSTM)与酉空时调制(USTM)成为近两年通信领域的研究热点之一. 提出一种提高频带利用率的调制信号设计的新思路, 并从理论上导出一种新的调制方式——双星座空时调制(DCSTM). DCSTM 将 USTM 和 DSTM 有机地融合, 融合后的调制可由查码表完成, 复杂度低. 作为 DSTM 和 USTM 的推广形式, DCSTM 保持了 USTM 的传输可靠性和调制信号可被非相干解调的优点, 并在频带利用率, 调制解调复杂度,适用范围, 对多速率信号的适应性等若干方面有明显提高. 仿真结果证明理论分析和给出的设计是有效的.
In the next generation of mobile communications, real-time channel estimation will be difficult to achieve due to the increase of the number of antennas and the moving speed, thus the differential space-time modulation (DSTM) and the unitary space-time modulation (USTM) One of the research hotspots is proposed.A new idea of modulating signal design to improve the utilization of frequency band is proposed and a new modulation scheme called DCSTM is derived theoretically.DCSTM combines USTM and DSTM Fusion, the fusion after the modulation can be completed by the code table, low complexity.As a promotion form of DSTM and USTM, DCSTM to maintain the USTM transmission reliability and modulation signal can be non-coherent demodulation advantages, and in terms of bandwidth utilization, Modulation and demodulation complexity, application range, adaptability to multi-rate signals, etc. The simulation results show that the theoretical analysis and the given design are effective.