一种高效的混合M元扩频通信方案

为进一步提高扩频通信系统的频带利用率和抗截获性能，将正交扩频技术与码相位循环移位调制技术相结合，提出了一种新的高效多进制扩频通信方案。在正交信道的每条支路上，首先采用M元双正交扩频调制，再以每一个扩频码为原型码进行码相位循环移位调制，选用专用的伪噪声码进行同步，在接收端用基于变换域处理的循环相关器进行解扩。计算机仿真表明，该方案易于实现同步，同时有较高的频带利用率和更强的抗截获性能。该方案在卫星隐蔽通信、数据链通信等领域有较大的应用价值。

An efficient hybrid M-ary spread spectrum communication scheme

In order to further improve the bandwidth efficiency and anti-intercept capability of spread spectrum(SS) communication system,a new efficient M-ary SS communication scheme is proposed,which combines orthogonal SS and code phase shifting keying(CPSK) technique.In each branch of orthogonal channels,double M-ary biorthogonal SS modulation is adopted at first.Then every SS code is treated as a original code to adopt CPSK modulation,and the unattached pseudo noise(PN) code is chosen to achieve system synchronization.At the receiver,a circular correlator based on transform domain processing is employed to despread the received signals.The simulations show that,the proposed scheme is easy to achieve synchronization,and is effective in improving the bandwidth efficiency and anti-intercept capability.The proposed scheme has great application value in the field of satellite covert communications and data link communications.