An ⅡC Algorithm Of MIMO-SCFDE Wireless Communication Receivers

Compared with wire communications, wireless communications face more challenges, such as how to improve the spectral efficiency and how to combat the multipath fading in wireless channel effectively. Block-wise transmission technique based on Cyclic Prefix(CP) has an outstanding performance in combating the multipath fading, including Orthogonal Frequency Division Multiplexing(OFDM) and Single Carrier Frequency Domain Equalization(SC-FDE), while MIMO system plays a conspicuous role in improving the spectral efficiency further. The combination of the two technologies becomes the key technologies of the next-generation wireless communication systems, for inheriting all merits of them.The SIC-based narrowband MIMO receiver can reduce interferences from different layers with the help of having adopted the technology of inference cancelation, among which V-BLAST is typical representative. BLAST architecture, proposed by Foschini coming from Bell Labs, is favored by Academe. But because of high complexity and the impact of error propagation, V-BLAST is not widely accepted by industry.This thesis first reviews the system structures and the principles of transmission systems and the combination of the two systems which causes the production of MIMO-SCFDE and MIMO OFDM systems. Then V-BLAST algorithm based on SIC idea is introduced.The SIC based has been widespread studied in MIMO-OFDM system, while rarely been reported in MIMO-SCFDE. In order to achieve low BER of these receivers based on linear equilibrium, we propose an efficient IIC algorithm of MIMO-SCFDE recievers, which can not only keep the advantages of simple structure and easy implement, but improve the system performance significantly. This thesis gives a brief introduction of the system structures and the principles, and the analysis of iterative times and complexity of IIC algorithm. Then a comparison is made between IIC and V-BLAST. After that we carry out performance simulation, whose results show that the MIMO-SCFDE system using IIC algorithm can considerably improve the performance than Decorrelative Receiver, V-BLAST receiver of MIMO-OFDM and block BLAST receiver of MIMO-SCFDE. With the increase of a number of the transmitting antennas, our system using IIC algorithm can gain more adversity, which makes a higher performance. If we increase the iterative times of IIC in a certain range, we will have an obvious advantage of system performance. At the same time, through simulations we find that performance of IIC algorithm has certain relations with modulation schemes and SNR. In order to improve the system performance further, we add convolutional code to IIC algorithm to enhance its iterative process. Good results were obtained in the combination of IIC and convolutional code.