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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...
Caching is an effective technique to improve user perceived experience for massive content delivery in wireless networks. An essential problem in cache-aided wireless networks is to find what and how much gain can be achieved by caching. This paper provides a study of the fundamental storage- latency tradeoff for a cache-aided MIMO interference network with 3 transmitters and 3 receivers and each...
This paper considers interference mitigation techniques in the forward link of multibeam satellite systems. In contrast to previous works, either devoted to receiver interference mitigation (e.g. multiuser detection) or transmitter interference mitigation (precoding), this work evaluates the achievable rates of the joint combination of both techniques. On the one hand, precoding cannot properly mitigate...
In this paper, we consider a heterogeneous network in which a macro-cell tier is overlaid with a very dense tier of small cells. The macro-cell base station (BS) that applies a massive MIMO scheme not only serves the macro user equipment but also provides a wireless backhual for small-cell access points (APs). These APs serve their associated small-cell user equipment. A reverse time division duplex...
In traditional cellular networks, cell edge users suffer from severe interference. This paper considers a cell free network scenario that multiple base stations (BSs) serve a group of users without cell boundary. Each user can only be served by its own BS according to the traditional cellular network paradigm, while in the user centric cell free network, users can be associated with multiple nearby...
In this paper1 we consider the Network MIMO channel under the so-called Distributed Channel State Information at the Transmitters (D-CSIT) configuration where the precoder is designed in a distributed manner at each Transmitter (TX) on the basis of local versions of Channel State information (CSI) of various quality. In that setting, a novel transmission scheme has been developed in [1] and surprisingly...
By employing sparse sampling, MIMO radars with matrix completion (MIMO-MC) achieve the performance of MIMO radars but with significantly fewer data samples. Further, due to the way the sparse sampling modulates the interference channel between radar and communication systems, MIMO-MC radars are good candidates for spectrum sharing. In this paper, we design a scenario in which a MIMO-MC radar optimally...
The present work deals with optimized strategies to address the issue of link adaptation (Adaptive Coding and Modulation — ACM) in a multi-user multi-beam satellite system employing precoding at the gateway side. Accordingly, the focus is on the forward link of a multi-beam satellite system employing a full frequency reuse configuration. In such an interference limited setting, the Super-Framing structure...
A low-complexity version of the offset maximization technique for robust precoding is developed for massive MISO downlink systems. Offset maximization precoding provides sub-stantial robustness under different channel uncertainty models, and can be modified to handle per-antenna power constraints. We also provide an improved power loading technique for any set of beamforming directions. This technique...
This paper deals with the problem of non-orthogonal multiple access (NOMA) in multibeam satellite systems. In the current NOMA approach, it is assumed a successive interference cancellation (SIC) receiver. To increase the spectral efficiency, NOMA with simultaneous non-unique detection (SND) is investigated. Since conventional scheduling heuristic rules do not longer apply in this scenario, different...
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 a closed-form interference alignment and cancellation scheme for the three-user multiple-input multiple-output (MIMO) X-channel network without symbol extension. We first demonstrate the basic principle of how to design the beamforming matrices for this set-up, then we estimate the sum rate achievable under perfect and imperfect channel state information. It is shown that...
In this paper, we consider two base stations (BSs) which maximize the achievable rate for two users connecting to each BS and sharing channel state information (CSI) in a multi-cell processing (MCP) framework. We propose a two way channel estimation or prediction process. Such framework has promising outcomes in terms of feedback reduction and achievable rates moving the system from one with unknown...
Millimeter wave (mmWave) is coming to fifth generation (5G) cellular, wireless local area networks (WLANs), and wireless personal area networks (WPANs). The benefits of using millimeter wave carriers arise from the potential for larger bandwidths (hundreds of megahertz to gigahertz) compared to lower carrier frequencies. Differences in the propagation, challenges introduced by hardware constraints,...
A price based spectrum sharing scheme is considered where a primary user allows certain secondary users to access its unused licensed band opportunistically or with coexistence. While in coexistence, network of multiple users, competing for the same idle spectrum, ends up causing intolerable interferences to the primary receiver. Since PU is of prior importance, any kind of interruption to its transmission...
In this paper, we consider bandwidth efficient design and channel estimation over time-varying frequency-selective environments, where the basis expansion model (BEM) is used to describe the time-varying channel. Superimposed training based channel estimation based affine precoding model is designed, where the data interference is eliminated from received data prior to performing channel estimation,...
The evolving fifth generation (5G) cellular wireless networks provide higher data rates, enhanced end-user quality-of-experience (QoE), reduced end-to-end latency, and lower energy consumption. The 5G networks will consist of macrocells, femtocells and picocells with heterogeneous characteristics and capacities which will result in a multi-tier architecture. Hence, interference is one of the main...
The superframing option of the recent DVB-S2X standard specifies, for the so-called SF-Pilot fields, the use of the orthogonal set of Walsh-Hadamard (WH) sequences. In order to exploit this orthogonality, waveforms coming from different beams to the k-th User Terminal (UT) should be quasi perfectly aligned in time. While in the downlink part of a terrestrial system this is quite straightforward, in...
The present work focuses on the forward link of fixed multibeam broadband satellite systems which employ aggressive frequency reuse patterns in the user-link. For such scenarios, the state-of-the art frame based precoding methods can improve the system performance, exploiting the super framing structure of the latest physical layer evolutions in satellite communications. Nevertheless, the limitations...
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