A New Integrated Spread-Spectrum System of Communication and Wireless Location with Eight Phases Space Time Modulation
Song Mao · 2002
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 .