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将空频块编码与嵌入式编码思想相结合,提出了一种新的嵌入式空频编码.待传输的信息被分为基本流(高分集)和加强流(低分集),在信道质量较差的情况下,用户只能收到基本信息流,保证了用户的基本业务传输.当信道质量较好时,用户可同时收到基本流和加强流信息,提高了业务传输质量.同时,针对2发射天线的嵌入式空频编码,得出了其峰均比表达式.仿真结果显示,在较低信噪比区域,嵌入式空频编码比传统的Alamouti空频编码具有更高的分集增益.同时,在多普勒频移较大的情况下,相对于2发射天线的机会主义空时块编码,新提出的编码方法具有更好的误比特性能.
Combining space-frequency block coding and embedded coding, a new embedded space-frequency coding is proposed, in which the information to be transmitted is divided into elementary stream (high diversity) and enhanced stream (low diversity) In the poor case, the user can only receive the basic information flow to ensure that the user’s basic service transmission.When the channel quality is better, the user can receive the basic flow and strengthen the flow of information at the same time, improve the quality of service transmission.At the same time, 2 transmit antenna, the peak-to-average expression is obtained.The simulation results show that the embedded space-frequency coding has higher diversity gain than the traditional Alamouti space-frequency coding in the lower signal-to-noise ratio At the same time, when the Doppler frequency shift is larger, the new proposed coding method has better error performance compared to the opportunistic space - time block coding of 2 transmitting antennas.