Research On The Polarization Diversity With Rayleigh Fading Channel

Between the wireless communication, the fading produced great impact to the transmission signal's quality, if in the deep fading cases it still can make the BER worsen sharply. In the former research, through increasing the transmit power to overcome the fading phenomena is not very realistic, and also to other communication equipment, thus causing serious interference. With the continuous development of electronic communications, diversity receiving technology has become an effective measures to fight the fading in the channel.First,different frome the equilibrium technology,the diversity technology don't need send the training sequence and the training expenses. The diversity technology is very useful,a lot of diversity technology can significantly improved link performance with very low additional cost.Therefore, based on the previous polarization diversity technology,this paper do the further analysis. A new improved method comes up with the polarization diversity of receiving technique under the Rayleigh fading channel. The new improved method can effectively improve the performance of the system,and in wireless communication,this improved technology is a kind of cost and can effectively improve smaller wireless communication link performance receiving technology.Secondly, the new method is the research to improve the BER of the maximal ratio combining under the Rayleigh fading channel. Its core idea is adding the automatic gain control module before the maximal ratio combining, to compensate for the lost of the signal-to-noise ratio between the receiving process, so as to enhance the performance of the whole system.Finally,simulation validation, using the maximal ratio combining diversity technology can greatly reduce the effect of the multipath fading, specially,the diversity receiving strategies by added automatic gain control module before the maximal ratio combining effectively resist further multipath fading channels of influence of wireless signals. The new improved method reduced the BER by an order of magnitude on the basis of the original improved, the improving effectiveness has been further improved. In addition, this paper also analyzes the near field interference between the antenna on the influence of the signal transmission, and puts forward a kind of near field - the theoretical model of the far field transformation.