CAJ | 학술논문

准确的频偏测量与补偿对于MIMO系统获得好的性能具有重要作用.在实际的环境中,信道中可能还存在空间相关的干扰.如果将相关干扰按白噪声来处理,那么频偏测量与补偿的精度会下降.如果干扰相关矩阵已知,它可直接用于频偏测量以提高精度;而通常情况下,干扰相关矩阵是未知的,对于这种情况提出一种迭代的频偏测量方法,以迭代方式估计和利用干扰相关矩阵,使频偏测量精度不断得到提高.频偏补偿分成粗补偿以及基于锁相环的精补偿,并在锁相环中加入干扰抑制处理.仿真结果表明,本文方法可以有效提高相关干扰情况下MIMO系统频偏测量与补偿的精度.
준학적빈편측량여보상대우MIMO계통획득호적성능구유중요작용.재실제적배경중,신도중가능환존재공간상관적간우.여과장상관간우안백조성래처리,나요빈편측량여보상적정도회하강.여과간우상관구진이지,타가직접용우빈편측량이제고정도;이통상정황하,간우상관구진시미지적,대우저충정황제출일충질대적빈편측량방법,이질대방식고계화이용간우상관구진,사빈편측량정도불단득도제고.빈편보상분성조보상이급기우쇄상배적정보상,병재쇄상배중가입간우억제처리.방진결과표명,본문방법가이유효제고상관간우정황하MIMO계통빈편측량여보상적정도.
Accurate frequency offset measurement and compensation is important for MIMO (multiple input multiple output) system to achieve good performance. In real environment, spatially correlated interference may exist in the channel. If the correlated interference is treated as white noise, the accuracy of frequency offset measurement and compensation will be degraded. The covariance matrix of interference can be directly used in frequency offset measurement to improve the accuracy provided that the covariance matrix is known. However,in general case, the covariance matrix of interference is unknown. In this case, an iterative frequency offset measurement method to improve the accuracy by estimating and utilizing the covariance matrix of interference in iterative way is presented. The compensation for frequency offset is divided into course compensation and precise compensation based on phase locked loop with the process of interference suppression. Simulation re-suits show that the method is valid to improve the accuracy of frequency offset measurement and compensation for MIMO system in the presence of correlated interference.