Research On Software Receiver Algorithm Of Space-time Modulation Signal

The system integrated communication and radiolocation is the developing trend of the future mobile communication, the generation method of the four antennas space-time modulation signal encoded based on the research of the multi-antenna space-time modulation system is introduced in this paper. The angle measuring system of the space-time signal in the Gaussian channel and multipath fanding channel is proposed, the semi-analytic simulation model of the space-time signal is also proposed, the simulation of the performance of the angle measurement and the performance of the bit error rate is presented. The receiver wave of the space-time modulation signal through certain multipath fading channel is also obtained.Presently, the waves of space-time baseband signal are single, which are all rectangular pulses, the azimuth of modulation signal is uncontinuous, it leads to intersymbol interference and phase jitter, The design idea of Intersymbol-Interference and Jitter Free(IJF) baseband signal is applied to space-time modulation to improve the problem in this paper, an IJF space-time modulation signal is proposed, the design and receiver method of the signal is given, the spectrum of the signal is also analyzed. The bit rate error performance of the IJF space-time modulation signal through Additive White Gaussian Noise channel and multipath fading channel is simulated in this paper, the comparison was made between the space-time modulation signal and the IJF signal. Simulation results illustrate the effectiveness of the proposed approach. The approach has a rational application on the finite spectrum resource.The receiver location can be determined by knowing the different carrier phases. In the end of the paper, the method of the code correlation is applied to the software receiver of the QPSK IF signal based on FPGA, the demodulation carrier signal is gained, which is used for the primary research on the space-time modulation signal based on FPGA.