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This paper focuses on the problem of throughput maximization in a self-powered point-to-point Multi-Input Multi-Output (MIMO) wireless communication system, the transmitter of which is powered only by energy harvested from ambient radio signals. The transmitter follows a save-then-transmit protocol in transmission frames. The protocol requires the system first carry out the energy harvesting process...
Cooperative multi-cell MIMO techniques are well known for their outstanding capability to mitigate inter-cell interference by allowing user data to be jointly processed by several interfering base stations for the improvement of the system performance. This paper proposes an iterative algorithm that designs the precoding matrix for cooperative multi-cell MIMO downlink communications. As the demand...
In this paper, we compare performances of the constant modulus algorithm (CMA) and data-aided time domain equalization (DA-TDE) algorithm for mode demultiplexing in few mode transmission systems. Simulation results of 4×56 Gbit/s QPSK mode-division multiplexed system show that the maximum required OSNRs with CMA are less than that of DA-TDE by 0.8dB and 4.6dB for maximum coupling coefficient of 0...
Adaptive blind MIMO equalization algorithm adopting decision feedback recurrent neural network(DFRNN) is proposed and investigated in 4 × 56 Gbit/s MDM-QPSK system. The required-data-length of DFRNN is 1/3 of that in CMA with similar performance.
In the Multiple Input Multiple Output (MIMO) systems, the receiver performance is greatly affected by Antenna Gain Imbalance (AGI). This paper proposes an novel AGI detection algorithm based on the Least Square (LS) channel estimation. The AGI parameter is accurately obtained after eliminating the influence of noise from the channel through the long-term statistics. Moreover, a compensation algorithm...
This paper proposed an efficient iterative frequency domain equalization (FDE) for cooperative multi-relay-assisted automatic repeat request (ARQ) single carrier systems operating over multiple-input-multiple-output (MIMO) channel. The receiver employs each retransmission as an additional set of virtual receive antennas to exploit the space diversity. At each iteration, soft inter-symbol interference...
The fixed-complexity sphere decoder (FSD) has been proposed to attain the near-optimal performance achieving the same diversity order as the maximum-likelihood decoder (MLD) recently. However, it suffers great redundant computations resulting in high power consumption. In this paper, we conduct an improved algorithm for the original FSD by using early termination (ET). This algorithm (abbreviated...
Simulation of wireless communication system is usually divided into system-level and link-level. Link-level simulation is generally used to simulate the point-to-point physical layer technologies with propagation model taken into account, which means it is based on single-cell and single terminal scenario. Multi-cell model is not often studied in link-level mainly due to its high complexity. So we...
In this paper, we consider practical multiuser multiple-input multiple-output (MU-MIMO) systems where each user has multiple receive antennas and limited channel feedback is available at the base station (BS). The joint combiner and precoding scheme for downlink transmission is proposed, in which we consider the joint use of the receive antenna combiner at each user and precoding at the BS. In the...
The asymptotic performance of transmit antenna selection (TAS) in a two-hop amplify-and-forward (AF) MIMO relay network over Rayleigh-fading channels is analyzed. Assuming that the source and destination are equipped with NS and ND antennas, respectively, and communicate with each other with the help of an NR-antenna relay, we derive closed-form statistics of received signal-to-noise ratio (SNR) around...
Random Network Coding (RNC) has emerged as an important technology in wireless communication. The present paper proposes a novel cooperative Virtual-MIMO (V-MIMO) structure by applying RNC to the cooperative transmission. Then the diversity gain of the RNC-based cooperative strategy is analyzed and compared with the conventional cooperative strategies. Higher diversity gain or multiplexing gain can...
We propose a cooperative orthogonal space-time block codes (OSTBC) transmission scheme in the adaptive-gain amplify-and-forward MIMO relaying with NS source antennas, NR relay antennas, and ND destination antennas, and analyze the asymptotic performance of the proposed scheme. Specifically, we explore the instantaneous channel state information (CSI) of source-to-relay channel and design an OSTBC...
The performance of transmit antenna selection (TAS) in a two-hop amplify-and-forward (AF) MIMO relaying network over Rayleigh-fading channels is analyzed. Assuming that the source, destination are equipped with NS and ND antennas, respectively, and communicate with each other with the help of an NR-antenna relay, we derive closed-form cumulative distribution function (CDF) of received signal-to-noise...
This paper focuses on maximizing Cognitive radio (CR) system capacity by flexible Multiple input multiple output (MIMO) system, while maintaining the interference to primary user (PU) within a limit. It is proposed that MIMO implemented in CR can not only increase throughput but also avoid interference to PU, so two corresponding multi-user MIMO schemes are given and a parameter called transition...
In the downlink cellular network, the coordinated multi-point transmission for single-user multi-input multi-output (CoMP-SU-MIMO) is employed in Long Term Evolution Advanced (LTE-A) system, which can effectively reduce inter-cell interference for cell-edge user equipments (UEs). A novel transmission scheme with the joint proportional fairness (PF) scheduling algorithm, which does not need to allocate...
Cooperative Communication enables wireless devices with relatively less antennas to share their antennas and create virtual multiple-antenna transmitter, thereby achieving transmit diversity to combat fading caused by multi-path propagation in wireless environment. At the receiver in a multi- input multi-output (MIMO) relay system, we can still utilize the traditional detection algorithm, such as...
Maximum-likelihood detection (MLD) is the optimal scheme for multiple-input multiple-output (MIMO) channels. However, due to its exponentially high complexity, many alternative algorithms, including some parallel detection (PD) ones with low complexity and high stability, have been proposed for practical applications. Nevertheless, the existing PD algorithms are unable to exploit sufficiently the...
This paper proposes a novel sub-optimal transmit antenna selection (TAS) strategy for non-regenerative half-duplex MIMO relay channel. While antenna selection is a sub-optimal form of beamforming, it still enjoys the advantage of tractable optimization and low feedback overhead. The diversity order of this proposed strategy is derived to prove that it can achieve the full diversity order as the optimal...
The maximum likelihood detection with QR decomposition and M-algorithm (QRM-MLD) has been proposed as a near-optimal multiple-input multiple-output (MIMO) detection scheme which can achieve near maximum likelihood (ML) performance with complexity greatly reduced. However, the performance of the QRM-MLD algorithm will deteriorate with the increasing of the number of transmit antennas, as well as the...
CDMA2000, WCDMA and WiMAX are three widely used 3G technologies. Since they share the same goal, which is to provide broader coverage and higher throughput in 3G networks, an impartial comparison of their performance is indispensable. However, they are based on different design principles and methodologies, which make the comparison challenging. This paper presents a comparative study of these technologies,...
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