Research On Structure And Scheme Of Low-complexity TR+MIMO Wireless Communication Systems

In the most TR+MIMO based communication systems, the signal of TR+MIMO is mainly designed by the radio frequency UWB signal processed by TR. As a result, the structure of the system will be very complex to achieve real-time and high-precision transmission. For MIMO, the complexity of the system will be doubled. Therefore, the study of low complexity TR+MIMO scheme is necessary. Based on this, the thesis studies from reducing the complexity of the system. The simplified and real time system can be realized by the low complexity of TR scheme based on the baseband OFDM signal. The innovation and features of the paper is as follows. First, the paper proposed a low complexity TR scheme. The scheme just need to reverse the phase of the channel while the amplitude needn’t which can reduce the complexity of TR processing module. Second, a low complexity of TR+MIMO space-time coding is designed. The method can achieve high communication performance and bear multi-users while not need to analysis the eigenvalue of the MIMO channel. The details of the paper are shown below.In chapter 1, the background, significance and research status of TR+MIMO systems are introduced. The introduction demonstrates that the performance of the domestic system is complex and poor real-time. As a result, the study of TR combined with OFDM based on software radio should be performed.In chapter 2, the basic theory of OFDM is introduced. Then, TR is used for OFDM signals which is sensitive for phase change by the adaptive conjugate-compensation technology.In chapter 3, OPR is proposed for the TR frequency selective deep fading. it can not only solve the above problem but also restrain the further amplification of additive white Gaussian noise(AWGN).In chapter 4, the performance, space focusing and the capacity of the TR+MIMO+OFDM system are studied. The theory proved the addition of MIMO can improve the signal to noise ratio(SNR) and deduce the bit error rate(BER). Furthermore, the correlation between antennas can be reduced by TR. Therefore, more antennas can be placed in limited space to improve the capacity of the system.In chapter 5, the XLink models of OFDM, TR-OFDM are build. The communication experiments of video transmission are conducted in room and metal cavity.In chapter 6, the main content of this paper is summarized. The next research direction is pointed out.