For multi-user MIMO downlink transmission, a block-diagonal zero-forcing (BD-ZF) precoder is usually used to suppress multi-user interference. In the case of a large number of transmitted antennas installed at the bas...
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For multi-user MIMO downlink transmission, a block-diagonal zero-forcing (BD-ZF) precoder is usually used to suppress multi-user interference. In the case of a large number of transmitted antennas installed at the base station, there exists a larger nullspace than the precoder requires. An optimal BD-ZF precoder is developed to maximise throughput using the determinant maximisation technique. It helps to gather all gain for the transmission of each user. Numerical results validate that the precoder obtains throughput improvement.
The authors present the performance analysis of a scheduled transmit antenna selection with maximal ratio combining (TAS-MRC) for multiple-input multiple-output transmission in the presence of multiple interferers. Th...
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The authors present the performance analysis of a scheduled transmit antenna selection with maximal ratio combining (TAS-MRC) for multiple-input multiple-output transmission in the presence of multiple interferers. They derive the probability density function of the instantaneous post-processing signal to interference plus noise ratio for the scheduled TAS with MRC over the Rayleigh fading channels under multiple interferers. Using the distribution, the closed-form expressions of the scheduled TAS with MRC are derived for symbol error rate (SER), outage probability and ergodic capacity in the presence of multiple interferers. From the analysis results, the performance of the scheduled TAS-MRC in the presence of multiple interferers is mainly determined by the signal-to-interference ratio. The performance of SER and ergodic capacity is less sensitive to the number of interferers.
In recent years, the demand for satellite communication has increased, and the realization of a higher capacity has become a challenge. However, the service area of each low-Earth orbital satellite changes constantly,...
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In recent years, the demand for satellite communication has increased, and the realization of a higher capacity has become a challenge. However, the service area of each low-Earth orbital satellite changes constantly, requiring many satellites for continuous communication, which increases space debris and the risk of collision accidents. This paper proposes a multiple-input multiple-output transmission system using low-Earth orbit and quasi-zenith satellites that can expand the channel capacity while reducing the number of required satellites. Numerical simulations demonstrate a 50% increase in throughput or a quarter reduction in the number of satellites required to achieve the same performance.
In this paper, we consider a MIMO Free-Space Optical (FSO) communication system over gamma-gamma turbulence channels and derive a closed-form analytical expression for the outage probability taking into account the ef...
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ISBN:
(纸本)9781467358224
In this paper, we consider a MIMO Free-Space Optical (FSO) communication system over gamma-gamma turbulence channels and derive a closed-form analytical expression for the outage probability taking into account the effects of both the inner scale size of optical channel and the aperture averaging. Our results demonstrate that by increasing the number of transmit and/or receive apertures, the degrading effect of the inner scale size is effectively reduced by extracting the spatial diversity gain of the MIMO scheme. We further provide Monte Carlo simulation results to confirm the validity of the derived expression.
In this paper, we investigate the outage performance of a multi-input multi-output (MIMO) free-space optical (FSO) communication system with selection combining (SC). Under the assumption of log-normal distributed atm...
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ISBN:
(纸本)9781467355636;9781467355629
In this paper, we investigate the outage performance of a multi-input multi-output (MIMO) free-space optical (FSO) communication system with selection combining (SC). Under the assumption of log-normal distributed atmospheric turbulence, we first derive a closed-form outage probability expression, and then demonstrate the achievable diversity order. We further provide Monte Carlo simulation results to confirm the validity of the derived outage probability expression and present the corresponding diversity gains.
This paper proposes an uplink power control strategy with a low-complexity receiver for massive multiple-inputmultiple-output (MIMO) transmission in the correlated Rayleigh block-fading channel. To avoid the large di...
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ISBN:
(纸本)9781479941452
This paper proposes an uplink power control strategy with a low-complexity receiver for massive multiple-inputmultiple-output (MIMO) transmission in the correlated Rayleigh block-fading channel. To avoid the large dimensional matrix inversion required by a minimum mean-square-error (MMSE) receiver in massive MIMO systems, we adopt the receiver based on truncated polynomial expansion (TPE) to reduce the complexity. We apply the uplink power control with the TPE receiver for the purpose of saving power consumption of all users. Due to the deterministic equivalent for the post-processing Signal to Interference plus Noise Ratio (SINR), we propose an iterative algorithm to jointly optimize the polynomial coefficients of the TPE receiver and the total transmit power of all users based on the long-term channel state information (CSI) without the exchange of the excessive amount of instantaneous CSI. We prove that the proposed algorithm is converged. Numerical results show that the transmit power consumed by the system using the uplink power control strategy with the TPE receiver is close to that with the MMSE receiver when the polynomial degree is properly high.
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