MIMO-OFDM Detection Algorithm Design And Its DSP Implementation For TD-LTE System

The development of wireless communication changed rapidly, greatly expands the application fields of wireless communication technologies and products. On land, Wireless communication system is becoming more and more mature and advanced. On the other hand, communication, especially the technology of broadband wireless communication is facing the pressure of wireless spectrum resources and capacity, Especially in flexible intelligent use of wireless spectrum resources are basicly in the early stage. OFDMA as a multiple access technology can effectively improve the utilization of spectrum and transmission rate, MIMO technology can enhance the anti-interference ability of wireless communication system and system capacity. Therefore, MIMO-OFDM technology has become the two core technologies of LTE physical layer.This thesis focuses on the research of MIMO signal detection technology of MIMO-OFDM system of TD-LTE uplink. Firstly, the system principle of TD-LTE standard MIMO-OFDM is elaborated,then,it introduces the TD-LTE protocol of baseband signal processing and a simple analysis of the transmit diversity and spatial multiplexing and beamforming. Also,this thesis builds the downlink and uplink level simulation platform of TD-LTE system. Then several classic MIMO detection algorithms are discussed in detail, including ML, MMSE, ZF, OSIC and SD detection algorithms. Combined with the LTE simulation platform, through the analysis of BER performance comparison and complex ways to analyze and test the several detection algorithm.The last part is an important part of this thesis introduces the DSPs part of software radio platform FT4000 implementation of the TD-LTE link level system. Introduces the realization of LTE system software architecture in the 3 cores DSP chip TMS320C6474, the function module division, each kernel processes and the concrete implementation scheme. The detail of the implementation of MMSE detection algorithm based on DSP has been given. Focusing on the complex matrix multiplication, division and the complex matrix inversion implementation and code optimization technique of DSP. In the end,the correctness and rationality of the whole TD-LTE link design are verified by the hardware in the semi simulation platform.