摘要
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。
In order to further improve the bandwidth efficiency and anti-intercept capability of spread spec-trum（ 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 em-ployed 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.
出处
《电讯技术》
北大核心
2016年第7期794-798,共5页
Telecommunication Engineering
关键词
直接序列扩频通信
M元扩频
双正交扩频
码相位循环移位调制
循环相关
direct sequence spread spectrum communication
M-ary spread spectrum
dual orthogonal spread spectrum
code phase shifting keying
circular correlation
