大規(guī)模MIMO組網(wǎng)場(chǎng)景中的JSDM用戶分組技術(shù)研究
[Abstract]:Multiple input multiple output (MIMO) technology has attracted much attention since its birth because it can increase the degree of freedom of space and improve the performance gain of mobile communication systems. However, with the rapid development of intelligent terminals and their applications, the huge data traffic generated by massive networked terminals has posed a great challenge to the existing mobile communication networks. Traditional MIMO technology has been unable to meet the demand. As an extension of the traditional MIMO technology, the large-scale MIMO technology not only inherits the advantages of the traditional MIMO technology, but also greatly improves the spectral efficiency of the system, and significantly reduces the energy consumption, hardware cost, empty port delay and so on. It has become one of the popular candidate technologies for the next generation wireless cellular communication system. However, there are still many problems to be solved because of the poor practicability of large-scale MIMO technology. With the increase of the number of antennas and the number of users, the downlink training and feedback overhead of large scale MIMO systems will be greatly increased. How to reduce these overhead is the most important problem for large-scale MIMO transmission technology. The main idea of the joint space division multiplexing (JSDM) downlink transmission scheme is to use the spatial correlation of the channel to group the users in each cell. It can effectively reduce the channel estimation overhead of large scale MIMO systems in FDD mode. User packet is the first step to implement JSDM scheme, and the traditional JSDM scheme is carried out in a single cell scenario. Therefore, this paper will focus on the JSDM user packet technology and interference coordination technology in multi-cell scenarios. Among the existing JSDM user packet algorithms, K-means grouping algorithm is widely used because of its simplicity and efficiency. However, the algorithm adopts random selection of initial user group center points, which has a great influence on the final grouping results and is easy to produce local optimal solutions. To solve this problem, this paper proposes an improved K-means user grouping algorithm, which uses the maximum distance method to select the initial center value, and uses the weighted likelihood criterion to replace the Euclidean distance criterion in the original algorithm to measure the difference of the user. After several iterations, the algorithm converges and users can be fully grouped. However, in multi-cell scenarios, the improved user packet algorithm can not eliminate or suppress inter-cell interference. Therefore, a JSDM interference coordination scheme for multi-cell is proposed in this paper. Based on the JSDM technology, the scheme uses the zero-space precoding design principle of the channel to project the effective signal of each user in the cellular network into the channel null space of all the other users. Then it can effectively suppress multi-cell interference. By modifying the existing long-term evolution (LTE) system simulation platform, the performance of the improved user packet algorithm and the zero-space interference coordination scheme proposed in this paper are verified and analyzed thoroughly. Simulation results show that the improved JSDM packet algorithm can effectively solve the local optimal problem caused by random initialization of traditional K-means algorithm in large-scale MIMO networking scenarios. The performance of the JSDM downlink transmission scheme has been improved by nearly 20%. In addition, the zero-space interference coordination method based on JSDM scheme can effectively suppress the multi-cell interference, thus the spectral efficiency of 5% of the cell edge and the overall throughput of the system can be increased by about 2.2 times.
【學(xué)位授予單位】:安徽大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TN919.3
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