| Summary: | 博士 === 國立中興大學 === 電機工程學系所 === 105 === In this dissertation, we will discuss the design and performance of adaptive receivers in wireless communications with multipath fading channel. The article structure is divided into three parts: firstly, we use the pipelined structure to design the iterative channel tracking, multiuser detection (MUD) and turbo equalization which with low latency, reasonable computation complexity and good channel tracking capability in MU-MIMO (multiple input multiple output) SC-FDMA system. The proposed scheme iteratively exchanges the estimated channel information and the detected data between the channel estimator and MUD employing a turbo technique, which gradually improves the accuracy of the channel estimation and the MUD. Secondly, we employ an adaptive receiver and construct two-path conjugate transmission that is based on the phase rotated conjugate cancellation (PRCC) concept in MIMO OFDM system. Moreover, we also consider joint Kalman filter and Turbo equalization to update Kalman filter, equalization and decoder information. Thirdly, we propose a turbo receiver with CFO compensation for MIMO GFDM (Generalized frequency division multiplexing) system with index modulation (IM). The adaptive receiver to solve CFO cancellation by two-path conjugate transmission and using modify phase rotated conjugate cancellation (PRCC) in receiver side is proposed. In order to reduce complexity, we employ Log-Likelihood Ratio (LLR) to search which subcarrier is active. Moreover, the Kalman filter is used to trace the time-varying channels. In the simulations, we compare the proposed receiver with existing conjugate cancellation (CC) and PRCC schemes in different time-varying channels and modulation. The proposed scheme outperforms the others.
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