||In this thesis, implementation of a MIMO-OFDM transceiver for indoor high throughput wireless communication systems is presented. Turbo encoder at the outer transmitter is used for improving performance. The inner transmitter supports 4 antennas, 64-QAM constellation and three operation models for different numbers of subcarrier (512, 256 and 128 point). At inner receiver, three main function block of synchronization, channel estimation and MIMO detection are implemented. To support Turbo decoding in the outer receiver, we design a soft-output K-Best sphere decoder. Which uses discard paths to improve the performance of system. Observing analyzing the relationship between the number of discard paths and performance, we propose independent path selection method and merged path selection method to reduce the complexity of discard paths. Independent path selection method has lower complexity and is suitable for hardware implementation. Merge path selection method has better performance. In the hardware implementation, we choose the Independent path selection method because of low complexity and good performance. In the end, we integrate inner and outer transceiver, and simulate the system performance in TGn channel model.|
In the project, we download the transceiver design into the FPGA, and integrate the RF analog frount-end. Finally we measure the signals of symbol boundary detection and channel estimation.
|| Chunhui Ju, Jun Ma, Chengzhi Tian, and Guanghui He, “VLSI Implementation of An 855 Mbps High Performance Soft-output K-Best MIMO Detector,” IEEE Circuits and Systems (ISCAS), pp. 2849-2852, May 2012.|
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