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Research for Synchronization, Channel Estimation and MIMO Decoding in SDM MIMO OFDM System

Author: WuYuan
Tutor: ChenKangSheng
School: Zhejiang University
Course: Electromagnetic Field and Microwave Technology
Keywords: MIMO OFDM Spatial multiplexing Synchronous Multi- receiver slip joint synchronization MIMO channel estimation MIMO decoding System capacity
CLC: TN919.3
Type: Master's thesis
Year: 2006
Downloads: 504
Quote: 1
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Abstract


Along with the continuous development of wireless communications and multimedia applications, wireless transmission system transmission rate and QoS assurance requirements also continuously improve. Orthogonal frequency division multiplexing (OFDM) as a new physical layer transmission technology is more and more attention has been paid, and is considered a key technology in the next generation (4G) mobile communications. OFDM inherited the traditional MCM the corresponding growth characteristics of multi-carrier modulation, in parallel symbol period, accurate symbol synchronization can be achieved in the secondary of a guard interval or cyclic prefix, effective conversion of the original frequency selective fading channel in order a plurality of parallel flat fading channel to use, and thus greatly improve the transmission efficiency. With the space multipath scattering channel capacity, the deepening of multiple-input, multiple-output (MIMO) technology has attracted more and more people concern. In this variety of MIMO system, the MIMO system based on the spatial multiplexing (Space Division Multiplexing) can be in the original transmission bandwidth and power consumption based on the full use of the multipath scattering spatial channel between transmitter and receiver, in the independent or part of a separate channel parallel transmission of multiple independent data, thus exponentially improve spectrum utilization efficiency of wireless transmission. MIMO technology and OFDM combined, can be increased at baseband OFDM system of multiple parallel to the traditional single-carrier-based spatial multiplexing MIMO system expanded to become a spatial multiplexing MIMO OFDM system (SDM for MIMO OFDM). The the SDM MIMO OFDM system not only has the good performance of OFDM in frequency selective fading channel transmission through spatial multiplexing exponentially increase the transfer rate of the original OFDM system. This thesis work starting from the base band OFDM system, the baseband OFDM system synchronization module frame synchronization, carrier synchronization with the symbol synchronizing processing tasks. Upon completion of frame synchronization, the carrier synchronization algorithm simulation based on the completion of frame synchronization and carrier synchronization hardware module implemented and tested on Xilinx FPGA target Plat. Carrier synchronization module in the design process, the paper improved design ML carrier synchronization algorithm proposed average to average and angle through the joint carrier frequency offset estimation. Matlab simulation results show that in the case of ML carrier synchronization processing using only the short training symbols, the use of joint-related average and the average angle of the algorithm can be used only than the same correlation length related average algorithm to obtain a more accurate synchronization estimation results. Requirements under the new algorithm can save about 2-3dB signal-to-noise ratio at the same estimated mean square error. The further hardware test results show that the estimates of the frequency deviation from 100kHz-200kHz carrier frequency offset test point, joint-related average angle average estimated the hardware carrier synchronization algorithm design module with the algorithm in Matlab only 0.33% of the maximum error between the results obtained on the algorithm level simulation. Time domain symbol synchronization process for traditional cross symbol synchronization algorithm vulnerable to carrier frequency offset interference caused not allowed to question the timing position, this paper proposes a new symmetric cross symbol synchronization algorithm. The symmetric cross-correlation symbol synchronization algorithm by the symmetrical structure effectively eliminates the interference from the carrier frequency deviation of the symbol synchronization process, the simulation results show that even in the case of the large carrier frequency deviation, the algorithm can also capture the accurate symbol synchronization position. Simultaneous symmetric cross symbol synchronization algorithm does not depend on the particular training symbol content and therefore can easily be applied to a variety of OFDM systems, the thesis completed performance of the symmetric cross-correlation algorithm in 802.16a and 802.11a standards The simulation results show that the circumstances meet certain conditions in the channel SNR, the algorithm can obtain accurate synchronization results. SISO OFDM system the receiver synchronization module processing in the baseband SISO OFDM expansion

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