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Professional Mobile Radio (PMR) requires higher reliability with less dense infrastructure than usual public mobile networks. Potential implementation of the next generation public mobile radio system Long Term Evolution (LTE) in PMR can bring new features, e.g., real time video. However, its feasibility must be carefully investigated with realistic PMR applications. This paper presents such an investigation...
The spectrum sharing has recently passed into a mainstream Cognitive Radio (CR) strategy. We investigate the core issue in this strategy: interference mitigation at Primary Receiver (PR).We propose a linear precoder design which aims at alleviating the interference caused by Secondary User (SU) from the source for Orthogonal Space-Time Block Coding (OSTBC) based CR. We resort to Minimum Variance (MV)...
Interference alignment is a promising approach to handle the interference in mobile radio networks especially at high SNR. In the present paper, the interference alignment is achieved using a number of MIMO relays in a scenario with K single antenna node pairs. A two-phase transmission scheme is considered assuming the channel to be constant during the transmission phases. Firstly, the source nodes...
Interference alignment (IA) has been shown to achieve the maximum degrees of freedom in the multiple-input multiple-output (MIMO) K-user interference channel (IFC). In the presence of frequency-selective channels, orthogonal frequency-division multiplexing (OFDM) is typically used to deal with the multipath nature of the channel. While IA techniques can be applied in a per-subcarrier basis (post-FFT),...
In this paper, we propose to evaluate the gain of multiple resource block (RB) allocation to user equipments (UEs) on the LTE uplink. Our multiple RB allocation strategy aims at achieving high cell's capacity and is compliant with SC-FDMA specificities i.e. UE limited transmission power and same modulation and coding scheme (MCS) for all allocated RBs to a given UE. The main implication of these constraints...
In this paper, four transmit beamforming (BF) techniques are selected and compared to realize inter-operator spectrum sharing, which is a promising solution for the spectrum shortage problem. The BF techniques include two game-theoretic (GT) algorithms, zero-forcing (ZF) and minimum mean square error (MMSE). After a brief description of the BF techniques in a multiple-input single-output (MISO) system,...
In this paper, a spatially multiplexed orthogonal frequency division multiplexing multiple input multiple output (SM-OFDM-MIMO) IEEE 802.11n system is assumed. The 802.11n system performance is comparatively analyzed implementing either linear minimum mean squared error (MMSE) receiver or MMSE ordered successive cancellation (MMSE/OSIC) receiver with both hard and soft decision Viterbi decoding over...
In this work, a novel linear precoding algorithm, called linear precoding-based geometric mean decomposition (LP-GMD), is proposed for the downlink of multi-user (MU) multiple-input multiple-output (MIMO) systems. The proposed scheme suppresses the multi-user interference (MUI) at the BS. Then it uses the GMD to decompose the equivalent single-user MIMO channel into multiple parallel sub-channels...
We consider the maximization of Weighted Sum Rate (WSR) for a Noisy Multiple-Input-Multiple-Output (MIMO) K cell Interfering Broadcast Channel (IBC) when only partial channel state information is available at the transmit side (CSIT) while assuming perfect CSI at the receiver (CSIR). In this work, CSIT is modeled by means of a Gaussian prior representing the mean and the covariance of the channel...
The Device-to-Device (D2D) communication can increase data rates and resource utilization in cellular networks. However, the direct application of the D2D communication can cause harmful interference to the cellular network. Therein, power control algorithms become essential tools to keep interference controlled and to ensure improved system performance. In this paper, we study two power control strategies...
This paper investigates an advanced receiver that employs two proposed interference rejection combining (IRC) modeling schemes, one for the covariance matrix and one for channel estimation errors. In a system performance evaluation, the link performance modeling of the IRC receiver, i.e., the output signal-to-interference-plus-noise power ratio (SINR) after IRC reception including the estimation errors,...
In this paper, we study the effect of oversampling in a perfect reconstruction (PR) filter bank multi carrier (FBMC) system recently proposed by the authors. Particularly, we investigate the performance of this system in the presence of carrier frequency offset (CFO). We show that the CFO introduces interference components in the receiver. By exploiting the statistical properties of the received subband...
In the context of Long Term Evolution (LTE)-Advanced, the transmission points responsible for Coordinated Multi-Point (CoMP) transmission can be arranged in a distributed way and each one can be equipped with multiple antennas. In such scenario, efficient Radio Resource Allocation (RRA) strategies are required to exploit the available spatial degrees of freedom, coordinate the resources usage and...
This work1 deals with interference alignment (IA) in a K-users MIMO interference channel with only incomplete Channel State Information at the Transmitters (CSIT). Incompleteness of CSIT is defined by the perfect knowledge of only a sub-matrix of the global channel matrix. Additionally, each Transmitter (TX) may have different incomplete CSIT. Most IA techniques are developed under a full (complete)...
The coexistence of a single-input single-output (SISO) primary link and a multiple-input single-output (MISO) secondary link is considered in an extended cognitive radio channel setup, where the secondary transmitter has to obtain (“learn”) the primary message in a first phase rather than having non-causal knowledge of it. An achievable rate region is derived that combines decode-and-forward relaying...
Femtocells and WiFi have been considered as viable concepts in cellular networks to increase overall system capacity. Critical functionalities for the successful integration of such technologies in macro-cellular topologies are related to radio resource allocation and interference management techniques that must ensure seamless intra-cell and inter-cell interoperation among macro- and femto users,...
In this paper, a DTV interference test was performed in order to measure the affected ranges of the DTV service that result from the operating of a narrowband system as a DTV White Space Service under severe environmental conditions. The DTV coexistence testing was performed in order to review the degree of DTV signal degradation depending on the bandwidth of the secondary users. For this, the criteria...
In FD-AWGN relay channel, the source sends the superposition of many capacity-achieving codewords. The relay decodes them using successive interference cancellation (SIC) and sends the superposition of the same codewords multiplied by random dither sequences and with a new power distribution among the codewords. The destination node decodes all code-words by removing the dithering and then applying...
This paper presents a game theoretic solution for end-to-end flow allocation with joint channel and power assignment in multihop cognitive radio networks under the physical interference model. The objective is to find a distributed solution that maximizes the network utility with limited information. We consider two different criteria to define this network utility: the number of flows that can be...
Energy-based sensing (EBS) has been a topic of strong research in the last years due to its importance to Cognitive Radios (CRs). While EBS has been used in several works, different parameterizations have been adopted. In this work we compare different parameterization criteria to determine the decision threshold to the energy detector. We compare their performance through simulations by characterizing...
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