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Today's wireless environment is very dense to support enhanced performance, which is become heterogeneous in cell, applications, services, standards and technologies. This dense deployment of heterogeneous cells has a large impact on the power consumption of network. Thus, issue of energy efficiency need to be considered in perspective of deploy of several base station (BS) in the area. In 5G standard,...
We develop an interference alignment technique, called cyclic IA, for full-duplex (FD) multiple-input multiple-output (MIMO) cellular networks in which a base station (BS) that operates in FD mode supports a set of half-duplex (HD) uplink and downlink users simultaneously. The key idea behind our approach is to construct a set of loop-equations enabling interference alignment, so that beamforming...
We consider a multi-cell massive MIMO system in which every base station is equipped with an array with M ≫ 1 antennas and serves a collection of users inside its cell. We study a scenario in which the base station and the users use OFDM signaling, and the channel state information (CSI) is estimated under time division duplexing (TDD) via orthogonal pilots transmitted from the users in the uplink...
Cell-Free Massive MIMO comprises a large number of distributed single-antenna access points (APs) serving a much smaller number of users. There is no partitioning into cells and each user is served by all APs. In this paper, the uplink performance of cell-free systems with minimum mean squared error (MMSE) and large scale fading decoding (LSFD) receivers is investigated. The main idea of LSFD receiver...
The LTE network is usually deployed with adjacent cells using the same frequency band, which significantly improves the frequency utilization efficiency. However, the cell-edge users may suffer throughput loss due to severe inter-cell interference (ICI). With the rapid grow of user terminals in LTE networks, ICI levels are rising and ICI becoming the dominant factor of the network capacity. Coordinated...
We present the application of statistical classifiers to the problem of automatic identification of radio frequency interference (RFI) in radio astronomy. RFI can corrupt measurements made by radio telescopes and it is therefore very important that such interference can be identified. We compile a dataset of RFI signals gathered at the SKA site near Carnavon, South Africa, and use this data to train...
Ad hoc networks continue to be severely interference limited. One approach to increase capacity is to go to millimeter wave (mmWave). Higher bandwidth but also directional antennas to reduce interference. Another approach is to stay at conventional frequencies but use techniques like interference alignment (IA). In this paper, we derive the scaling laws for dense mmWave ad hoc networks with directional...
Decoupling uplink (UL) and downlink (DL) is a new architectural paradigm where DL and UL are not constrained to be associated to the same base station (BS). Building upon this paradigm, the goal of the present paper is to provide lower, albeit tight bounds for the ergodic UL capacity of a decoupled cellular network. The analysis is performed for a scenario consisting of a macro BS and a set of small...
Future dense small-cell networks are one of the key 5G candidates to offer outdoor high access data rates, especially in millimeter wave (mmWave) frequency bands. At those frequencies, the free space propagation loss and shadowing (from buildings, vegetation or any kind of obstacles) are far stronger than in the traditional radio cellular spectrum. Therefore, the cell range is expected to be limited...
In this paper, a new physical-layer network coding (PNC) scheme is proposed for multiple-input multiple-output two-way relay networks where all network nodes, including two terminal nodes and the relay node, are equipped with multiple antennas. Spatial division multiplexing (SDM) technique is used at the two source nodes to increase transmission rate while the physical-layer network coding based on...
This paper proposes a subframe shift method to provide the full-duplex operation for the full-duplex base station (BS) in the current time-division long term evolution (TD-LTE) systems. For the full-duplex operation using the proposed subframe shift, we also propose a frame structure for the simultaneous transmission and reception of full-duplex BS operating in the current TD-LTE system and a signaling...
The objective of this presentation is to illustrate that the principle of superposition of power is not always valid in electrical engineering and hence not applicable to analysis of multi antenna systems where multi-streams are affected by mutual interference. In electrical engineering, it is the voltage and the current that always can be superposed and that is why another name of it is field theory,...
Resonant induction wireless charging requires two-way communications between the ground side and the vehicle side charging apparatus for vehicle identification, billing, charge control and for other communications and control requirements. To date vehicle wireless charging systems have used off-the-self digital communications devices operating half-duplex operating in the very popular but increasingly...
In this paper, we develop a circuit power selection algorithm to maximize energy efficiency (EE) of mobile users for the uplink multi-user multiple input multiple output system (MU-MIMO) in multi-cell environment. In proposed algorithm, antenna selection algorithm is proposed for circuit power optimization considering a inter-cell interference. We verify the performance of proposed algorithm using...
This paper evaluates the simultaneous impact of antenna correlation and imperfect channel state information (CSI) on the sum rate achievable in the compound multiple-input multiple-output (MIMO) Broadcast Channel (BC). The considered correlation model incorporates the correlation due to the proximity of antenna elements at both transmitter and receiver sides. We analyse the achievable sum rate and...
Pilot contamination caused by non-orthogonal pilot sequences reuse in adjacent cells has become one of the main impairments for massive multiple-input multiple-output (MIMO) systems. A scheme named flexible pilot reuse is proposed in this paper to reduce the effect. The main idea is that users suffered from mild pilot contamination (PC) are allocated the same set of orthogonal pilots, while the users...
In this paper, we investigate link adaption in massive Multiple-Input and Multiple-Output(MIMO) system, where the base station is equipped with a large number of antennas. Specifically for the linear minimum mean square error (MMSE) receiver at the base station, the achievable ergodic rate is used to calculate channel quality indicator (CQI) for each user equipment (UE). We propose a rate calculation...
In this paper, we show the effects of phase noise on the bit-error rate (BER) and average achievable rate per user performance in downlink multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) based amplify-and-forward (AF) relay systems. We derive the mathematical representation of the signal-to-interference-plus-noise ratio (SINR) per user in the presence of phase...
In this paper, we investigate the inter-cell interference mitigation through mode selection of coordinated multi-point (CoMP) techniques in downlink LTE-A networks. The proposed scheme selects the single-cell (SC) or coordinated beamforming (CB) or joint processing (JT) transmission mode according to interference level to maximize the sum rate. We propose a low complexity algorithm which takes full...
In this paper, we propose an in-band full duplex (IBFD) cellular operation with reconfigurable uplink (UL) antennas at base station (BS). For handling mobile station (MS)-to-MS interference in an IBFD cellular system, a repetition coding of UL MSs is considered. While the repetition coding of UL MSs is applied, downlink (DL) MSs can cancel MS-to-MS interference by using one silent symbol to measure...
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