A novel M-ary modulation technique based on optimal chirp signal design

A novel M-ary chirp modulation technique based on an optimal chirp signal design is proposed in this paper to offer higher data rate for an indoor wireless chirp spread spectrum communication system. Both linear chirp signals and combined chirp signals are used in this system to reduce the effect of the cross correlation, and simplify the complexity of the system. The optimal scheme of de- signing both linear chirp signals and combined chirp signals is discussed to minimize the value of the cross correlation and obtain a better system performance. Simulation results show that, compared with the binary orthogonal chirp modulation technique, the M-ary chirp modulation technique based on an optimal chirp signal set has a higher data rate with a reasonable bit-error rate （BER） perform- ance under both additive white gaussian noise （AWGN） channel and indoor wireless channel.

宽带无线信道仿真技术研究

针对常用的无线信道模型主要作用于点频或者窄带信号,不能满足宽带信号传播特性模拟的问题。在窄带信道模型的基础上,提出了一种宽带无线信道仿真的建模思路,通过在大尺度衰落仿真建模过程中引入宽带特性,并与频率选择性小尺度衰落模型相结合,实现宽带无线信道的建模和仿真,满足了宽带信号传播特性模拟的需求,对于宽带无线信道建模仿真具有一定的参考意义。