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Traditional semi-blind channel estimation schemes for massive multiple-input multiple-output systems are based on eigenvalue decomposition (EVD) or singular value decomposition (SVD). However, EVD based or SVD based estimators are too complex for practical implementation. To reduce the complexity, a new adaptive semi-blind channel estimator for massive MIMO systems is developed in this paper. The...
The existing cooperative spatial multiplexing (CSM) schemes for MIMO-CDMA network have four vital problems to hinder CSM's application: exact synchronization among the mobile stations(MSs) and base station (BS), spatial channels' estimation for MSs, space-time coding and decoding for BS and MSs, the implementation complexity of BS and MSs. To solve the problems, a simplified cooperative spatial multiplexing...
This paper investigates two problems of transmit beamforming in MIMO spatial multiplexing (SM) systems: 1. remove the feedback for channel estimation of mobile stations; 2. remove the classical space-time coding of MIMO systems. In the proposed MIMO spatial multiplexing (SM) systems, mobile stations only send uplink pilots in their uplink data transmitting, do not need to estimate spatial channels...
Channel estimation is important for coherent detection in UWB-OFDM systems, which accuracy affects system performance directly. Based on direct DFT, a windowed DFT estimation algorithm is proposed. The Hanning window is applied to channel impulse response to reduce the spectral leakage in the time domain. The channel information gained from the estimation is used for equalizing signals to reduce the...
Channel estimation is important for coherent detection in UWB-OFDM systems, which accuracy affects system performance directly. Based on direct DFT, a windowed DFT estimation algorithm is proposed. The Hanning window is applied to channel impulse response to reduce the spectral leakage in the time domain. The channel information gained from the estimation is used for equalizing signals to reduce the...
This paper proposes a FIR-RAKE receiver algorithm that makes use of a pilot signal broadcast by the TD-SCDMA (time division-synchronous code division multiple access) base station to obtain channel parameter estimates in the downlink of TD-SCDMA wireless network. The algorithm can reduce multipath interference for the mobile units and with lower complexity of FIR implementation, where only one marching...
This paper proposes a feedback pre-equalization (F-PE) method based on channel estimation in uplink channel. The transmitter signal is pre-equalized in transmitter by channel estimate information, which form downlink pilot channel. In receiver, the orthogonality of each spreading code is restored, but the power of noise isn't increased. So, the BER performance is improved. The F-PE method shows the...
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