基于MIMO-OFDM系統(tǒng)的UEP傳輸方案研究
[Abstract]:In the field of wideband wireless communication, MIMO-OFDM system is becoming an important means to ensure the high speed and reliable transmission of data, and the sensitivity of video data to the quality of channel transmission is higher than that of general data. The video transmission performance in wireless channel can be improved by using UEP hierarchical transmission technology. Therefore, this paper aims to study the UEP transmission scheme based on MIMO-OFDM system. The main research results are as follows: 1. The proposed ST-OFDM-UEP transmission scheme is improved to become a SF-OFDM-UEP transmission scheme. This scheme combines the MIMO-OFDM system structure with the diversity embedded STBC coding that supports UEP transmission, and improves the STBC codeword placement method for SFBC, to arrange Alamouti codewords in adjacent OFDM subcarriers. Through theoretical analysis and simulation, it is proved that SF-OFDM-UEP scheme can resist the influence of Doppler frequency shift better than ST-OFDM-UEP scheme, so its application scope is extended to high-speed mobile wireless transmission field. In addition, the effects of some system related settings on transmission performance are studied by simulation, including pilot placement, IFFT length (number of OFDM subcarriers), and pilot insertion interval. 2. To improve the frequency domain channel partition-feedback mechanism UEP transmission scheme, channel quality evaluation in space and frequency domain, grouping, and the design of frame structure through reasonable feedback mechanism, The sub-channel groups assigned to each priority data stream at the sender have unequal transmission reliability, that is to say, channel resources are reallocated according to transmission quality, so that UEP hierarchical transmission is realized. For the MIMO-OFDM system with 4 脳 4 array structure and given hierarchical requirements, three different channel partitioning schemes are designed and compared with the original scheme by simulation. Several schemes are evaluated in terms of classification performance and spectrum efficiency.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN929.53
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