Link Adaptation and Precoding for Spatial Multiplexing in LTE System
碩士 === 國立暨南國際大學 === 通訊工程研究所 === 99 === This thesis presents an efficient method for calculating the Precoding Matrix Indicator (PMI), Rank Indicator (RI) and Channel Quality Indicator (CQI) at a Long Term Evolution (LTE) User Equipment (UE). The indicators are required for spatial preprocessing and...
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| Format: | Others |
| Language: | zh-TW |
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2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/00396885076682746929 |
| Summary: | 碩士 === 國立暨南國際大學 === 通訊工程研究所 === 99 === This thesis presents an efficient method for calculating the Precoding Matrix Indicator (PMI), Rank Indicator (RI) and Channel Quality Indicator (CQI) at a Long Term Evolution (LTE) User Equipment (UE). The indicators are required for spatial preprocessing and link adaption in the downlink of a 3GPP UMTS/LTE system. In order to reduce the computational complexity for the UE, it is must to be decomposes the problem into two separate steps, one of jointly evaluating the PMI and RI based on a mutual information metric and one of choosing the CQI value to achieve a given target Block Error Ratio (BLER) constraint. We use these two steps proposed several methods to reduce complexity. The first is a majority vote method (Majority), the second is a channel average method (Average) and the third is a reference signal method (Reference). We use the proposed algorithm to analyzing how much complexity can be reduced without losing too much throughput.
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