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Channel estimation is a key issue in time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) system, which is usually based on pseudorandom noise (PN) sequences time domain correlation. However, in space time block coding (STBC)-based TDS-OFDM MIMO system, PN sequences received in each receiver antenna are the overlaps of multiple transmitters' linear convolution of PN sequences...
Block diagonalization (BD) is a low-complexity linear preceding scheme for multiuser MIMO (MU-MIMO) downlink, which can completely eliminate multi-user interference with perfect channel state information (CSI) at the transmitter. Under the assumption of block fading channels, BD with fixed amount of feedback is interference-limited. In this paper, we first introduce a low-complexity CSI feedback scheme,...
In this paper we study a MIMO fading broadcast channel where each receiver has perfect channel state information (CSI) while the transmitter only acquires quantized CSI by finite rate feedback. We analyze the zero-forcing dirty-paper coding (ZF-DPC) scheme, which is a nonlinear preceding scheme inherently superior to linear ZF beamforming. Lower bound in closed-form expression and upper bound on the...
Tomlinson-Harashima precoding (THP) is a successive pre-equalization technique that arranges all the receivers into a group of layers and then suppresses the interlayer interference in sequence at the transmitter. There are two basic THP structures according to the positions of the diagonal weighted filter-decentralized at the receivers or centralized at the transmitter-which are denoted dTHP or cTHP,...
Many precoding schemes in downlink multiuser MIMO systems require perfect channel state information of all users at the transmitter, which is hard to realize in practical systems. Random beamforming scheme is a conventional method to reduce the amount of feedback. However, it only enjoys significant performance gains with a large number of users, which limits its practical application. We propose...
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