Research On Enhanced Non-Cooperative Receiver In LTE MIMO

Non-cooperative receiving in wireless communication is a procedure that from the point of view of the third-party, signals are intercepted and captured and finally processed. It’s the key part of the information interception of reconnaissance technology. With the continuous development of communication technology, wireless communication system possesses higher security performance. It also brings non-cooperative receiving a much greater challenge. This paper mainly studies non-cooperative receiver in MU-MIMO scene how to improve its performance.First, the Chapter II introduces the background knowledge of non-cooperative receiving of this paper, describes the system models of SU-MIMO and MU-MIMO. MIMO channel capacity and the precoding are introduced accordingly. In the end of Chapter Ⅱ, SCM is briefly introduced for further simulation. Then, at the beginning of Chapter Ⅲ, multi-user scene of this paper discussed is described, and minimum mean square error (MMSE) receiver and symbol level interference cancellation (SLIC) receiver are applied to simulate non-cooperative receiving. According to the introduction of sounding reference signals (SRS) of LTE, we know about the SRS of each user in Cell are orthogonal. The SRS of target user interference is proposed to change the result of upstream channel estimation of target user in base station, and then affecting the precoding vector of base station, improving the performance of non-cooperative receiver. According to the preliminary simulation, we get the result of interfering the SRS of target user can do improve the performance of non-cooperative receiver.According to the result of Chapter Ⅲ, associate with SLIC receiver, three schemes are provided to improve the performance of non-cooperative receiver in Chapter Ⅳ, which are pilot interference to the target user, pilot interference to the non-target user and pilot interference based on channel correlation, and they are simulated respectively. Then, set the non-cooperative goals, three ways are simulated to achieve the goals, which are pilot interference to target user based on random noise, pilot interference to target user based on weight factor and pilot interference based on channel correlation. Analyzing and comparing the advantages and disadvantages among the three methods by simulation, the conclusion is the third method though the highest complexity, performance is the best. In the end of Chapter Ⅳ, spatial channel model (SCM) is applied to simulate the three schemes that are proposed to improve the performance of non-cooperative receiver and the three methods that meet the non-cooperative conditions, it gets the similar results of correlative channel that this paper adopts, thereby it proves the realistic feasibility of these schemes.The Chapter Ⅴ summarizes the research work of this paper, and points out the next possible research directions.