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TD-LTE uplink channel estimation technology research and implementation

Author: GuoYuBin
Tutor: ZhangYuanJian
School: South China University of Technology
Course: Communication and Information System
Keywords: TD-LTE Single Carrier Frequency Division Multiple Access Channel estimation Multiple Input Multiple Output
CLC: TN929.5
Type: Master's thesis
Year: 2011
Downloads: 150
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Abstract


In recent years , 3GPP Long Term Evolution (LTE) attracted widespread attention and become a hot research field of wireless communications . This on OFDM / FDMA and MIMO technology has been selected as the ITU fourth generation mobile communication systems (4G) of the two candidate reference . Uplink LTE system uses a single carrier frequency division multiple access (SC-FDMA) technique , which combines OFDM and single carrier frequency domain equalization (SC-FDE) advantage, and and LTE downlink OFDMA system has a similar structure , uplink reception just do a simple end frequency domain equalization , the most important thing is to have a low signal PAPR (PAPR), will help improve the efficiency of RF power amplifiers user equipment to extend the use of time . This study is based demodulation reference signal (DMRS) for LTE uplink channel estimation techniques . First introduced wireless channel fading characteristics , given the provisions of 3GPP LTE base station conformance test channel model . After detailing the SC-FDMA technology, its implementation, the system structure and its similarities and differences with OFDMA analysis of each . Followed by a brief discussion of the LTE uplink MIMO technology , and discussed in detail LS, MMSE, DFT-based three channel estimation algorithm , and multi-user MIMO channel estimation method, simulation comparison of the different conditions of performance of the algorithm , proposed a An improved DFT-based channel estimation algorithm . Based on the final build an LTE uplink channel PUSCH hardware systems , DSP implementation discussed specific issues above algorithm , we propose a fixed-point DSP for high-precision division algorithm , combined with the channel simulator tests verify the different channels and different modulation and coding environment mode algorithm. Using simulation platform and hardware platform way of contrast , the findings show that the use of the proposed method can be consistent with the theoretical analysis of the performance .

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