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Multiple-input multiple-output (MIMO) is a natural and effective way to increase the capacity of white light-emitting diode (LED) based visible light communication (VLC) systems. Orthogonal frequency division multiplexing (OFDM) using high-order modulation is another widely used technique in VLC systems. Due to the intensity modulation and direct detection nature of VLC systems, Hermitian symmetry...
This paper investigates low complexity detection for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with co-channel interference (CCI). We firstly derive minimum mean square error (MMSE) detection based on sorted QR decomposition (SQRD) and modified MMSE SQRD detection for MIMO-OFDM systems with CCI. Although better performance can be achieved by the...
In order to achieve reliable communication, transmit diversity is commonly used in multiple antenna systems. Currently, to obtain transmit diversity, space-time code is usually used. In this paper, a new multiplicative transformation scheme is proposed for multiple antenna systems with non-binary low-density parity-check (LDPC) codes. It is shown that this scheme can provide transmit diversity. In...
Interference alignment (IA) improves the system performance because it makes maximally overlap the interference in multi-user MIMO system. However, the current study was based on a given power; it does not take full advantage of the system's total power. How to allocate power among the users based on interference alignment is the key to this paper. Firstly, a framework of MIMO interference channel...
Long Term Evolution for Railway (LTE-R) is commonly believed to be the next generation wireless communication system for high speed railway. The main objective of this paper is to assess the performance of LTE-R under realistic conditions using a hybrid high speed railway channel model involving WINNER II Channel Model that was refined and validated using measurements made within the WP1 Channel Model...
Space-time block codes (STBC) are widely used to obtain diversity gain in multiple-input multiple-output (MIMO) channel and Turbo codes are used to provide coding gain. So here a turbo-coded STBC concatenated system, which fully exploits the diversity gain and coding gain are studied. Specially we propose an iterative decoding scheme with a soft information processor created in the system to adjust...
In this paper, we investigate the performance of iterative decoding for concatenated Turbo coded and Space-time block coded (STBC) system. In our proposed system the soft parity bit needs to be estimated, which differs from traditional Turbo decoding, as the receiver adopts iterative decoding not only to Turbo codes but the entire system. In this case a simplified and effective method of parity bit...
In this paper, the performance of vertical Bell labs space-time (V-BLAST) algorithms for the MIMO systems with two transmit antennas is analyzed over correlated-Rayleigh channel. We derive the analytical bit error rates (BERs) of the first and second detection steps for both optimal and fixed detection ordering schemes. We also investigate the signal-to-noise ratio (SNR) degradation of the detection...
In this paper, we investigate MIMO systems with transmit antenna selection over an intra-class correlated Rayleigh fading channel. In our study, one single transmit antenna with an aim to maximizing the total received signal-to-noise ratio (SNR) is selected for transmission, while it is assumed that the receive side use all the available antennas. Using binary-phase-shift-keying (BPSK) modulation...
MIMO schemes can improve the capacity observably. The co-channel interference (CCI) and noise are two major impairments to a multi-user MIMO downlink. The precoding based on signal-to-leakage-and-noise ratio (SLNR) makes a balance between eliminating the CCI and the noise, so it improves the system performance. But the channel state of every user is different, the channel quality effects the performance...
Limited feedback for precoding matrices is very practical in the multiple-input multiple-output antenna communication system. In this paper, a capacity criterion is proposed to design the precoding codebook, which emphasizes the negative impacts of the limited feedback and maximizes the capacity directly. Then, the generalized Lloyd algorithm is used to construct the precoding codebook according to...
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