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The need for cell densification leads to inter-cell interference mitigation techniques known as coordinated multipoint (CoMP) transmission and reception. In this work, we start from the weighted sum-rate maximization problem by evaluating the capacity of the broadcast channel (BC). We employ non-linear dirty paper coding (DPC) on a cluster basis with additional co-channel interference (CCI) caused...
An inter-cell interference coordination (ICIC) technique that recently has attracted interest is to create protected subframes to reduce inter-cell interference. This technique can under some circumstances lead to almost blank subframes (ABS) where there is interference only on the pilots but no interference on the data. This paper analyzes the performance of traditional MRC and IRC receivers for...
In this paper, a practical approach to pilot contamination precoding (PCP) for massive MIMO is proposed through a joint clustering and pilot reuse scheme. We also introduce power scaling to enforce per-base station (BS) power constraints. We consider a massive MIMO system, where uncoordinated conventional beamforming is implemented in each cell. PCP acts as outer linear precoding prior to conventional...
In this paper, the traditional power minimization problem under some QoS constraints in a SISO cellular network is considered. However, the research is distinguished by two points. (1) The association relationship between base stations (BS) and users is no longer known and fixed. (2) When the QoS constraints are not satisfied, instead of simply claiming the problem is infeasible, the network tries...
Heterogeneous networks (HetNets) are expected to be one of the major performance enhancement enablers of LTE-Advanced. In order to protect pico-UEs from the strong macro interference, the macro eNBs need to reduce the transmission power during protected subframes instead of suspending data transmission introduced in 3GPP Release 10, scheduling strictly users in the vicinity of the macro eNBs. In this...
It is well known that parallel interference channels (ICs) are in general inseparable. Existing results illustrate the benefit of joint encoding across sub-channels by exploiting the asymmetry within the individual sub-channels. In this paper, we show, perhaps surprisingly, that symmetric parallel ICs are also inseparable. To this end, a class of parallel ICs is considered in which each individual...
In this paper, we derive a new outer and two inner bounds for a class of Interference Relay Channels (IRCs) which includes the Gaussian IRC as a special case. The inner bounds are based on the idea of rate-splitting at the sources with either decode-and-forward (DF) or compress-and-forward (CF) at the relay. Our main contribution lies in showing for a wide range of regimes of the Gaussian IRC that...
This paper provides a joint implementation of Fractional Frequency Reuse (FFR) and relays in the downlink of multi-cellular networks like Long Term Evolution (LTE) networks. The forecasted benefits concern inter-cell interference (ICI) mitigation in each cell. Based on this network architecture and related improvements, individual user throughputs and signal to interference plus noise ratio (SINR)...
We propose a multiple-input multiple-output (MIMO) two-way relaying based underlay device-to-device (D2D) communication system, in which relay uses physical layer network coding (PNC). Both cellular and D2D communication take place in the same spectrum. D2D communication is based on PNC, and a joint transceiver design is required to facilitate PNC mapping with MIMO channels. A joint precoder-decoder...
In this paper, we analyze the performances of the Medium Access Control protocol Multi-slot-ALOHA in a wireless ad hoc network modelled by a Poisson Point Process (PPP). By giving to nodes access to the medium for several time slots, Multislot ALOHA strengthens the reliability of transmissions, which is the main weakness of MAC protocols without acknowledgements. To our knowledge, this protocol has...
Network densification with universal resources reuse is regarded as a possible solution to increase capacity and deal with the “1000x” mobile data challenge in future 3GPP radio access networks. Interference is the major performance limitation is such networks, and global coordination of coexisting transmissions comprises the technology enabler for achieving high performance levels. In this work we...
Inter-cell interference in downlink cellular networks can be managed by coordination among the base stations (BSs). Constraints on the backhaul throughput make full coordination still challenging and typically clusters of BSs are organized to serve the user equipments (UEs). Joint precoding within each cluster is designed to deal with intra-cluster interference. Moreover, inter-cluster interference...
This paper addresses the problem of decoding and precoding in the K-user MIMO interference channels. At the receiver side, a joint decoding of the interference and the desired signal is able to improve the receive diversity order. At the transmitter side, we introduce a joint linear precoding design that maximizes the joint cut-off rate, known as a tight lower bound on the joint mutual information...
Coordinated multipoint (CoMP) transmission and reception techniques have been proposed to combat inter-cell interference in cellular systems and, hence, to increase the data rates. Due to the overhead introduced, not all users may be served with CoMP. In this paper, we focus on how to select users for joint processing CoMP under limited backhaul capacity. The evaluated user selection schemes take...
The direct-conversion architecture used for Orthogonal Frequency Division Multiplexing (OFDM) systems suffers from intercarrier interference (ICI) between image subcarriers in each OFDM symbol due to I/Q imbalance between the inphase (I) and quadrature (Q) branches at the transmit and receive sides. One of the widely-used metrics to evaluate the performance degradation due to I/Q imbalance is the...
Underlay cognitive radio (CR) permits unlicensed secondary users (SUs) to transmit their own data over the licensed spectrum unless the interference from the SUs on the licensed primary user (PU) exceeds an acceptable level. This paper proposes two interference alignment (IA)-based distributed optimization designs for multiple secondary transceivers in underlay cognitive radio case with channel uncertainty...
Joint transmission (JT) is a promising coordinated multipoint (CoMP) transmission scheme for achieving high downlink capacities in wireless cellular networks of next generation. In this paper, an adaptive scheme, named as partial JT CoMP is presented. This scheme improves the network throughput by dynamically adjusting points involving in jointly transmitting according to the instantaneous channel...
Wireless devices have experienced great development in the past decade. During this period, secrecy studies have drawn heated attention. Traditionally, there mainly exist two methods to optimize secrecy transmissions, precoding scheme and artificial-noise-aided scheme. In this paper, we propose a joint design of precoding and artificial noise in a relay-aided network with the channel state information...
This paper is concerned with Gaussian interference channels (GIFC) in which all transmitters are coded with binary low-density parity-check (LDPC) codes. We focus on the design of decoding algorithms. The main contributions of this paper include: 1) we present three types of iterative decoding algorithms (IDA), which are computing-decoding type, decodingcomputing type and computing-decoding-computing...
High capacity requirements in wireless systems can be met, at the network level, by using dense small cell deployments and, at the link level, by improving spectral efficiency via spectrum reuse. In this context, we consider a small-area radio system, e.g. a pico-or femtocell, where a full-duplex access point serves simultaneously two half-duplex devices, one in downlink and one in uplink direction...
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