非线性预编码中的星座扩展及解调方法研究
[Abstract]:As the evolution technology of 3G technology, LTE has become the common choice of major operators in the world because of its higher system capacity, transmission reliability and spectrum efficiency. And has made significant progress in global commercial processes. MIMO technology is undoubtedly one of the core technologies of LTE. However, due to the common problems of multiple data streams and interference between multiple users in MIMO system and the distributed processing of each user receiver, it is no longer practical to carry out joint detection at the receiving end. Therefore, a precoding technique using channel state information (CSI) to adjust the transmission strategy is proposed at the transmitter. The precoding technique can effectively suppress the interference between multiple data streams and users in MIMO system. While greatly reducing the processing complexity of the receiver, the channel capacity is significantly increased, which is helpful for MIMO to obtain its unique multiplexing gain and diversity gain. In this paper, the precoding technology of MIMO downlink in LTE is studied. Compared with linear precoding algorithms, such as ZF (zero forcing) precoding and MMSE (least mean square error) precoding, Nonlinear precoding algorithms, such as THP (Modular precoding) and VP (Vector perturbation), and some of their derivation algorithms can obtain more significant performance gains than linear precoding at the cost of acceptable complexity. However, both the THP and VP precoding algorithms need to introduce the mold extraction operation. Because the THP algorithm uses the mold extraction operation at both the sending and receiving end, this will introduce the die extraction loss, the shaping loss and the power loss. The VP also uses the mode-taking operation at the receiving end, which will also introduce the loss of the mode-fetching. These losses will bring negative gain to the performance of THP and VP precoding, which will seriously affect the performance of MIMO systems under nonlinear precoding. In order to solve the above problems, this paper proposes an improved transceiver algorithm for THP and VP precoding. The main work of this paper is as follows: briefly review the principle and function of precoding technology in MIMO system, expound the design principle of linear precoding algorithm such as ZF and MMSE and nonlinear precoding algorithm such as THP and VP, and make use of MATLAB simulation. Verify the performance of various pre-coding algorithms and compare their advantages and disadvantages. This paper analyzes the loss of THP precoding algorithm which is caused by the introduction of mode-taking operation into the transceiver, and considers the soft demodulation scheme of extended constellation diagram based on Turbo channel coding, such as the loss of mode-fetching, the loss of shaping and the loss of power. On the other hand, in view of the fact that the mode-taking operation may cause the symbol of the receiver to drift beyond the mode-taking limit, this paper considers the extended mode-taking interval scheme, but the system with the extended mode-taking interval will increase the power loss while reducing the mode-taking loss. In this paper, we propose to find out the optimal modulus extraction expansion factor between the mode extraction loss and the power loss, so that the overall performance of the system can still have gain after the addition of the mode extraction expansion factor. In this paper, the simplified scheme of VP precoding, LRA-VP precoding, is studied, and a precoding algorithm based on multi-user modulation schemes based on LRA-VP is proposed for link and system-level simulation with AMC. This paper analyzes the loss of LRA-VP precoding algorithm caused by the introduction of mode-removal operation at the receiver, and considers the soft demodulation scheme based on the extended constellation diagram based on Turbo channel coding. Similarly, in view of the fact that the mode-taking operation may cause the symbol of the receiver to drift beyond the threshold of the mode-taking, this paper considers the extended mode-taking interval scheme, but the system with the extended mode-taking interval can reduce the loss of the mode-fetching and the precoding gain of the VP at the same time. In this paper, we propose to find the optimal modulus extraction expansion factor between the loss and the precoding gain, so that the overall performance of the system can be improved after the addition of the modulus extraction expansion factor.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN929.5
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