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This paper propose a method of suppressing inter-user interference in the in-band full duplex communication. In this method, an interference compress technique is used for eliminating the interference at the receiving terminal. Also, we evaluated the achievable transmission rate of the proposed method by using channel state information (CSI) measured by the outdoor field experiment.
In this paper, we propose a novel pseudo-random beamforming (BF) technique in multi-cell downlink networks consisting of multiple base stations (BSs) and one BS coordinator. In the proposed technique, each BS first generates M BF matrices with a pseudo-random manner and each mobile station (MS) opportunistically feeds back the received signal-to-interference-and-noise (SINR) ratio for each random...
In this paper, the downlink ergodic rate of distributed antenna systems (DASs) is studied with linear beamforming under pilot contamination. Utilizing Jensen's inequality and the properties of Gamma distribution, we derive a closed-form expression of the achievable rate with maximum ratio transmission (MRT) beamforming. Then, based on the approximation for non-isotropic vectors as well as the properties...
This paper addresses the robust beamforming design for a downlink cloud radio access network (cloud RAN) subject to per-base-station (BS) power constraint and individual signal-to-interference-plus-noise ratio (SINR) requirements. Our objective is to minimize the overall network power and backhaul cost while guaranteeing the users' SINR constraints for every channel realization by designing the joint...
This paper provides an tractable analysis of the downlink spectral efficiency of multi-cell multi-user distributed antenna systems (DASs) using stochastic geometry with maximal ratio transmission (MRT) and zero-forcing (ZF) beamforming. Firstly, based on the properties of Gamma variable, the distributions of signal and interference power can be obtained. Then by modeling remote antenna units (RAUs)...
In this paper, we consider an alternative low-cost and flexible solution of using an analog antenna array for radio sensing at the base station receiver in the recently proposed perceptive mobile networks. We provide receiver beamforming design, and advanced compressive sensing (CS) signal processing techniques for sensing parameter estimation in a multiuser-MIMO (MU-MIMO) communications system. Simulation...
In this paper we consider transmit beamforming schemes for downlink control channel. In particular, we propose exploiting information on user location for selecting both the serving transmission/reception point (TRP) and transmit beam used for control channel transmissions. Moreover, a suppressed zero-forcing (SZF) scheme based on vertically and horizontally polarized transmit beams is proposed with...
Hybrid preceding, which refers to the combined use of phased arrays and digital (baseband) beamforming, is the main transceiver architecture under consideration for millimeter-wave (mmWave) wireless systems. However, this configuration is not suitable for receivers with a single RF chain, that must rely on fully-analog beamforming. In this paper, we consider the problem of finding the best analog...
A scenario consisting of several cells is considered where each cell contains a multiple-antenna enhanced remote radio head (eRRH) and several single-antenna mobile stations (MSs). All eRRHs can access the cloud with limited capacity fronthaul links. The beamforming problem aiming at maximizing the sum rate with per eRRH power constraint is considered. In this paper, a hierarchical one-shot top-down...
Although non-orthogonal multiple access (NOMA) is recently considered for cellular systems, its key ideas such as successive interference cancellation (SIC) and superposition coding have been well studied in information theory. In this paper, we overview principles of NOMA based on information theory and present some recent results. Under a single-cell environment, we mainly focus on fundamental issues,...
In millimeter-wave communication systems with large-scale antenna arrays, conventional digital beamforming may not be cost-effective. A promising solution is the implementation of hybrid beamforming techniques, which consist of low-dimensional digital beamforming followed by analog radio frequency (RF) beamforming. This work studies the optimization of hybrid beamforming in the context of a cloud...
In this paper, we propose two practical and economic beamforming design methods under consideration of an effective acquisition mechanism of partial channel state information at transmitter (CSIT) for frequency-division duplex (FDD) massive MIMO systems. In contrast to previous beamforming designs with total power constraint, per-antenna power constraints are considered in this paper because of the...
Cloud radio access network (Cloud-RAN) has great potentials to improve energy efficiency and increase capacity of wireless networks. In this paper, we study the green communication for Cloud-RANs. Instead of only focusing on the transmit power consumption, we minimize the network power consumption which includes not only transmit power consumption but also circuit power consumption. In addition, we...
In a conventional cellular wireless networks, single cell processing (SCP) is usually considered where inter-cell interference is treated as noise. As we know, interference can cause severe information leakage for secret communication, the paper studies the secrecy performance with coordination beamforming (CBf) scheme in the downlink of a two-cell multi-user MIMO (MU-MIMO) cellular network. For CBf,...
Heterogeneity and convergence are two distinctive features for new generation networks like the Long Term Evolution-Advanced (LTE-A) system. LTE-A is now being deployed and is the way forward for high speed cellular services. LTE-A enhancements the four areas of capacity, coverage, inter-cells coordination, and cost. Improvements in these areas are based on using several technologies. Multiple-Input...
In order to improve the spectral efficiency of downlink in a multiuser system, nonorthogonal multiple access (NOMA) has been extensively studied for 5th generation (5G) systems. NOMA allows a group of users to share a given channel by exploiting the power difference. Since downlink multiuser beamforming can also be used to support multiple users for a given channel, in this paper, we combine NOMA...
In this paper, we propose a new method for nonorthogonal multiuser downlink transmission, referred to as multiple-input multiple-output lattice partition multiple access (MIMO-LPMA). The new method is based on the combination of user selection, zero forcing beamforming, and LPMA, and it uses N base station antennas to deliver information to N clusters of M users each. The method thus accommodates...
In this paper, we propose an optimization framework for selecting an optimal downlink beamforming vector and an optimal uplink transmission power level in full-duplex small cell wireless networks. We study the case in which the full-duplex base station is equipped with multiple antennas and each half-duplex UE is equipped with a single antenna. To benefit from recent progresses in all-digital self-...
The uplink spectrum of cellular networks is often underutilized due to the asymmetric behavior of wireless data services. To enhance the efficiency, a full-duplex (FD) cellular system is proposed to reuse the uplink spectrum for concurrent uplink and downlink transmissions. By jointly designing transmit beamforming and power control, a weighted sum-interference power minimization problem is formulated...
We propose a beamforming technique for the multicell downlink of a multicarrier code division multiple access (MC-CDMA) system with sparse signatures. We propose a distributed beamforming algorithm using the sum-product algorithm. The distributed beamforming algorithm converges very quickly to the centralized beamforming solution, minimizing the delay associated with computation of the transmit vector...
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