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Heterogenous networks and massive MIMO can significantly enhance spectral and energy efficiencies of wireless networks and have recently attracted lots of attention. In this letter, we investigate joint user association and spectrum allocation to further improve spectral efficiency for massive MIMO enabled heterogeneous networks with full-duplex wireless backhauls. The optimization problem is formulated...
Heterogenous network and massive MIMO can significantly enhance spectral and energy efficiency of wireless networks and therefore have attracted much attention. In this paper, we analyze the performance of a downlink heterogenous network where a macro base station (BS) is equipped with a large number of antennas. Lower bounds on ergodic rates for macro and pico users are derived when macro and pico...
In this paper, we investigate the impact of power amplifier (PA) nonlinear distortion in pre-coded multi-user large antenna or massive MIMO downlink systems. First, detailed signal and sys-tem models are derived for the received signal at single-antenna user equipment (UE) under channel-aware linear precoding in the base-station combined with behavioral models for the individ-ual PA units, covering...
In this paper, we contribute to the secrecy outage analysis of transmit antenna selection (TAS) with switch-and-examine combining (SEC) in the Multiple-input multiple-output (MIMO) wiretap channel. The complexity of SEC is lower than maximum-ratio combining (MRC) and selection combining (SC). The transmit antenna which maximizes the instantaneous signal-to-noise ratio (SNR) at the receiver is selected...
The virtual multiple-input multiple-output (V-MIMO) and coordinated multipoint transmission and reception (CoMP) have been adopted by the LTE- Advanced as these techniques can significantly improve the uplink spectral efficiency. Given the poor cell-edge performance of the conventional determinant pairing scheduling (DPS), and the heavy backhaul brings about by performing coordinated reception (CR)...
Orthogonal experimental design (OED) is a well-known method in statistical experiment which aims to reduce the testing complexity. This paper tries applying OED to reduce the computational complexity in Multiple-input Multiple-output (MIMO) detection. Several times of sorted QR decomposition (SQRD) algorithm are applied firstly to get the diverse solutions. Then a subspace is constructed with the...
A novel Multiple-input Multiple-output (MIMO) detection scheme based on orthogonal experimental design (OED) is proposed in this paper. By exploiting the initial solutions given by linear detection and non-linear detection algorithms, a searching subspace is constructed to obtain additional performance gain. Exhaustive searching method is optimal in the subspace, but with quite high complexity. Then...
Multi-User Multiple Input Multiple Output (MU- MIMO) technique is introduced into 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) to enhance the system capacity and spectrum efficiency. On the other hand, Coordinated Multi-Point transmission and reception (CoMP) technique which can reduce inter-cell interference (ICI) significantly, has been adopted in LTE-Advanced as one of the...
Next generation wireless communication systems, such as 3GPP LTE-Advanced and ITU IMT-Advanced, are demanded to support 1Giga-bit per second (Gbps) peak data rate. Compared with traditional systems, 1Gbps high throughput systems have some different difficulties in system design and hardware implementation. This paper mainly presents some important design criterions and novel methods on parameter design...
Closed-loop MIMO system can provide dramatic gains in channel capacity. However, mobile terminal (MT) must feedback the downlink channel state information (CSI) to Base station (BS), and transmitting CSI is a heavy burden consuming considerable uplink bandwidth. To address this bottleneck problem, a zero-overhead downlink CSI feedback scheme is proposed in this paper. After receiving the downlink...
A user pairing method is proposed to improve the throughput and users' fairness performance in virtual multiple input multiple output (VMIMO) in 3rd Generation (3G) long-term evolution (LTE). This approach is based on post-processing signal to interference plus noise ratio (SINR) of each user, and takes both large scale and small scale fading into account, which renders more spatial multi-user diversity...
With the advent of multimedia services featured 4th generation (4G) mobile communications, multiple input multiple output (MIMO) combined with multi-level quadrature amplitude modulation (M-QAM) technique gains great popularity for its capability of supporting high data rate. In this paper, the statistical distribution of post signal to noise plus interference ratio (SINR) in each iterative step of...
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