一种新型八相时空调制扩频通信定位综合系统

A New Integrated Spread-Spectrum System of Communication and Wireless Location with Eight Phases Space Time Modulation

为了在通信的同时测定用户位置 ,提出了一种新颖的八相时空调制扩频技术 ,它利用含有方位信息的八相信号状态 ,实现直接序列扩频时空调制 .调制信号的频谱和通信能力与扩频 QPSK相同 ,但可以测得接收机方位 ,更适于通信定位综合系统 .文中巧妙地利用了正交矩阵、沃尔氏序列与其交替倒相序列正交的特性 ,解决了信号的编码、调制、发射、解扩、载波提取和方位角估计等关键技术问题 ,分析了误码和测角性能 .

To meet the challenge of future mobile communication and integrated communication and wireless location systems, a new spread spectrum communication system with eight phases space time modulation technology is proposed to transmit azimuth and communication message. The spectrum, capacity and bit error rate of this system are similar to the spread spectrum QPSK. The paper suggests a method of matrix to describe the principle of modulation. The key technical problems such as modulation, transmitting array antennae, demodulation, carry recover and direction finding are solved, by taking into consideration the orthogonal metrics and the fact that a walsh sequence w n is orthogonal to (-1) n-1 w n .