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In this paper, we aim at green small cell networks by jointly achieving self-backhaul and energy harvesting. We study full duplex (FD) technology and massive multiple-input and multiple-output (MIMO) technology to enhance the performance. In order to improve the energy efficiency (EE) further, we design a precoding scheme to eliminate the inter-tier interference. Moreover, we formulate the cell association...
This work focuses on the downlink of a single-cell large-scale MIMO system in which the base station equipped with M antennas serves K single-antenna users. In particular, we are interested in reducing the implementation complexity of the optimal linear precoder (OLP) that minimizes the total power consumption while ensuring target user rates. As most precoding schemes, a major difficulty towards...
Analytical expressions to approximate the expected per-user signal-to-interference-plus-noise-ratio (SINR) and ergodic sum-rate of a multiuser multiple-input-multiple-output system are presented. Our analysis assumes uncorrelated Ricean fading channels with regularized zero-forcing precoding on the downlink. The derived expressions are averaged with respect to the previously unknown arbitrary eigenvalue...
Power and spectrum are considered as the significantly resource in the satellite communication systems, recently multiple-input multiple-output (MIMO) precoding has been identified as an excellent choice for the multibeam satellite communication systems (MSCSs). In order to improve power and spectrum utilization while mitigate the intra-beam interference and inter-beam interference, the crucial challenge...
For conventional multiple-input and multiple-output (MIMO) selective decode-and-forward (S-DF) relaying network, without global channel knowledge, base station (BS) normally allocates its transmission power for the channel links between itself and its served users. In this case, if the received signal power at relay station (RS) is larger enough, RS will help BS decode and forward the messages. However,...
We study the precoding for the high-rank MIMO in the LTE-A Pro systems. Unlike the low-rank precoding, layer mapping has a relatively large impact on the performance for high-rank precoding. First, we construct a model on the relationship between layer mapping and precoding. Then we derive the system throughput with the resulting model, so that the performance of the layer mapping and precoding can...
In massive multiple-input multiple-output (MIMO) system with time-shifted pilots, the interference from other cell groups, where the pilots are staggered with the ones in the target cell group, can be eliminated when the number of antennas at base station (BS) is infinite. However, with only hundreds of antennas at the BS in practice, both intra-group interference and inter-group interference can...
Interference alignment (IA) is a well-known transmission strategy for interference channels, with which the sum rate can linearly scale with the number of users at high signal-to-noise ratio (SNR). However, most existing works on IA considered only the maximization of the sum rate without taking into account the bit error rates (BER) performance. In this work, we firstly propose a novel IA algorithm...
Abstract-The paper studies a scheme that jointly considers beamforming based MU-MIMO and NOMA in a downlink cellular network with underlaid D2D users. Two different MU-MIMO beamforming schemes are developed. The first beamforming scheme aims to eliminate the interference caused by different beams while the second one aims to cancel out the interference from base stations to D2D users. An optimization...
Downlink Coordinated Multi-Point (CoMP) transmission schemes are often considered as an effective means to minimize the impact of co-channel interference from neighboring transmission point(s) on the performance of cell-edge users. For Long-Term Evolution Advanced (LTE-A), CoMP was defined in Rel 11 and supports three types of transmission schemes: Coordinated Scheduling and Coordinated Beamforming...
The communication system based on the faster-than-Nyquist (FTN) signaling is a bandwidth-efficient technology which has drawn much attention recently. Since FTN uses faster symbol rate than Nyquist signaling, inter-symbol interference (ISI) is generated inevitably in the receiver. Partial Decision Feedback Equalization (PDFE) cancellation is an efficient interference cancellation and signal detection...
Cooperation among mobile operators non-orthogonally sharing the communication resources can considerably boost network efficiency if the interference originated from the non-orthogonal communication is properly addressed. Utilization of standard precoding methods would require sharing of sensitive information such as users' signals and channel state information. In this paper, we propose a novel cooperative...
Abstract-Interference is a key problem for multi-cell networks and interference alignment (IA) is a promising method to manage interference. This paper investigates whether a feasible IA scheme can improve the system performance of Device-to-Device(D2D) communication underlaying multiple-input-multiple-output (MU-MIMO) uplink in multi-cell networks. We propose a novel cell division pattern based on...
Several research efforts are invested to develop stochastic geometry models for cellular networks with multiple antenna transmission and reception (MIMO). On one hand, there are models that target abstract outage probability and ergodic rate for simplicity. On the other hand, there are models that sacrifice simplicity to target more tangible performance metrics such as the error probability. Both...
A general framework for the analysis of expected per-user signal-to-interference-plus-noise-ratio (SINR) of a multiuser multiple-input-multiple-output system is presented. Our analysis assumes spatially correlated Rayleigh fading channels with regularized zero-forcing precoding on the downlink. Unlike previous works, our analytical expressions are averaged over the eigenvalue densities of the complex...
Precoding for multibeam satellites with aggressive frequency reuse has attracted interest of late towards enhancing system capacity. Most of the works on precoding mitigate the linear co-channel interference between the beams caused by frequency reuse. However, the high power amplifier (HPA), an integral part of the satellite payload, is inherently non linear. Non-linear amplification combined with...
We present centralized iterative algorithms that jointly determine the optimal transmit and receive filters as well as the optimal power allocation for a K-user multiple-input multiple-output (MIMO) interference channel (IC). The optimality criterion is based on the achievable sum-rate and the average per user multiplexing gain in the MIMO IC. By allowing channel state information (CSI) exchanged...
The weighted sum rate (WSR) maximizing linear precoder algorithm is studied in large correlated multiple-input single output (MISO) interference broadcast channels (IBC). We consider an iterative WSR design which exploits the connection with Weighted sum Minimum Mean Squared Error (WMMSE) designs as in [1], [2] and [3], focusing on the version in [1]. We propose an asymptotic approximation of the...
In this paper, we propose an adaptive linear pre-coder design for an underlay cognitive radio (CR) multiuser MIMO broadcasting system. The proposed adaptive precoder employs regularized channel inversion based on the minimum mean square error (MMSE) criterion. Unlike the conventional MMSE precoder, the proposed precoder exploits degrees of freedom not being used so far, which considerably improves...
In-band full-duplex, allowing simultaneous transmission and reception on the same device over the same frequency, can double the spectral efficiency theoretically. However, the severe self-interference challenges the physical layer design. Thus, to simplify the interference cancellation (IC), the space division full-duplex (SDFD) is considered, where two spatial-separated transmission points (TPs),...
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