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Coordinated multi-points (CoMP) transmission has been widely proved to be effective to combat inter-cell interference in 3GPP LTE-Advanced systems. However, implementation complexity of inter-site CoMP and relatively low capacity gain of intra-site CoMP motivate us propose a beam coordinated multipoints (Beam-CoMP) transmission scheme for 5G millimeter-wave cellular network. Considering the specific...
Because of the effect of the space local scattering, when two non-coherent desired signals are incident in the mainlobe of the beampattern at the same time, the beampattern of the conventional adaptive beamformer can form a null in one of the desired signal directions, which will further destroy the integrity of the mainlobe and lead the output signal-to-interference-plus-noise ratio (SINR) to drop...
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.
Investigations on antenna array for 5.8 GHz frequency band applications are presented in this paper. In order to enhance the characteristics of the dielectric resonator antenna elements, a pair of resonators with different sizes and dielectric constants is used. The antenna elements are connected to four daughter-boards of Universal Software Radio Peripherals, which perform the signal processing required...
This paper considers a frequency-division-duplexing (FDD) massive multiple-input multiple-output (MIMO) system that operates with two-stage beamforming based on user grouping. In this system, we propose a first stage beamformer and a user grouping method for the two-stage beamforming. The proposed first stage beamformer maximizes an approximate sum rate calculated from the second-order statistic of...
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...
For the specific propagation characteristics of millimeter wave, in this paper, we study the beamforming design and interference management in millimeter wave cellular networks with partial channel state information (CSI). Specifically, we propose two beamforming schemes, namely eigen beamforming and orthogonal beamforming, based on the information of channel covariance matrix, and analyze the intercell...
The main objective of this paper is to develop an efficient satellite digital beam-forming (BF) method that can provide user specific desirable signal-to-interference-plus-noise ratio (SINR) or data rate for each user in each zone. And a massive multiple-input multiple-output (MIMO) communications system model and its favorable channel propagation condition are assumed (i.e., channel independence...
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...
In this paper, we consider a two-tier cellular network consisting of a primary macro cell base station (PMBS) which is overlaid by cognitive small cell base stations (CSBSs) to achieve efficient spectrum utilization. The deployment of two-tier cellular networks can provide higher capacity for the system but also causes cross-tier, intra-tier, and inter-tier interference within the cellular networks...
In this paper, we investigate multiple-input single-output (MISO) simultaneous wireless information and power transfer (SWIPT) broadcast channels with confidential messages (BCC) scenario, in which a multiple-antenna transmitter simultaneously transmits confidential messages and power to multiple single-antenna receivers. Considering the imperfect channel state information (CSI), we study the joint...
A linearly constrained minimum variance (LCMV) beamformer aims to completely remove interference and optimize the signal-to-noise ratio (SNR). We examine an array geometry consisting of multiple sub-arrays. Our analysis shows that the increased intersensor distance typical of such setups is beneficial for the task of signal separation. Another unique feature of distributed arrays is the necessity...
In this paper, we propose hybrid beamforming scheme for multi-user transmission in millimeter wave (mmWave) communications. The sum rate maximization problem considering limited feedback is formulated and solved by the joint scheduling and hybrid beamforming algorithm with two-stage channel state information (CSI) feedback framework. In the proposed scheme, the base station (BS) first narrows down...
With the explosive growth of mobile data demand, exploiting millimeter wave (mmWave) frequency band is regarded as a promising solution in the fifth-generation (5G) cellular networks. In each generation of cellular networks, cell planning (CP) is the primary stage before deployment. However, due to mmWave's characteristics being different from traditional microwave at relatively low frequency, CP...
In this paper, the problem of adaptive beamforming in the presence of direction-of-arrival (DOA) mismatch is investigated. To develop a robust beamformer against such an imperfection, a new approach is devised by formulating an output signal-to-interference-plus-noise ratio (SINR) maximization problem. In particular, the proposed robust beamforming approach consists of two steps. At first, the standard...
In this paper, we investigate the secrecy rate maximization problem for a multi user multiple-input single-output (MISO) broadcast interference communication system with simultaneous wireless information and power transfer (SWIPT), in the presence of external eavesdroppers. Assuming that the channel state information is perfectly known at the transmitter, the main aim is to maximize the secrecy rate...
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)...
Due to dense small cells deployment in a heterogeneous network, the backhaul links among the small cells and macro cell are band-limited when they share the same spectrum with the user equipments. To mitigate the intra- and inter-cell interference caused by the band-limited backhaul, we propose a recursive estimation-based zero-forcing beamforming (RE-ZFBF) scheme. Based on initial values obtained...
This paper considers the virtual cell(VC) association and multi cell scheduling in Ultra-Dense Network for sum-rate maximization where multi dimensional resources allocation strategy is coupled and interference environment is complex. For virtual cells association, a metric is proposed which is transformed from the non-convex problem via a series of decouples and captures the gain of multi user diversity...
By simultaneously transmitting multiple waveforms, multiple-input multiple-output (MIMO) radar can obtain enhanced flexibility in transmit beampattern synthesis and signal processing. However, the most existing research works concentrate on matching the desired beampattern and neglect the following signal processing, such as pulse compression and adaptive receiving beamforming. As MIMO radar is able...
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