LTE-R系统的双流波束赋形方案设计与研究

摘要

In order to improve the spectrum efficiency and reduce the co-channel interference in high-speed railway quick-changing channel environment, a PMI-quantized dual-stream beam-forming method is proposed with a view to maximize effective power of transmitted signals. The method makes dual-stream beam-forming more efficient by constructing a weighted codebook applied to high-speed railway and offers rapid searching according to the reciprocal channel estimation information of TDD. Simulation results show that the method reduces the computational complexity of dual-stream beam-forming enormously with very small performance loss compared with the traditional algorithm based on SVD decomposition, and efficient dual-beam-forming can be realized in the LTE-R system downlink.%在高速铁路快变无线信道条件下，为了提高频谱利用效率，减小同频干扰，利用有效功率最大化准则提出一种新的基于PMI量化的双流波束赋形方案。所提方案构建了适合高速铁路场景下基站八天线下行波束赋形权值码本并设计波束赋形权值快速搜索方案，进而利用TDD系统信道互异性搜索量化赋形权值。仿真结果表明，该方案在大大降低系统双流波束赋形复杂度的同时，相对于传统基于SVD分解算法性能损失不大，可实现LTE-R系统下行快速双流波束赋形。