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This paper considers the joint antenna selection (AS) problem for a classical two-user non-orthogonal multiple access (NOMA) network where both the base station and users are equipped with multiple antennas. Since the exhaustive-search-based optimal AS scheme is computationally prohibitive when the number of antennas is large, two computationally efficient joint AS algorithms, namely max-min-max AS...
The work in this manuscript proposes to enhance the secrecy level of wireless systems through the use of a jamming technique that uses uncorrelated reciprocal channel estimations from the legitimate channel as a common random source to select discrete jamming signals in both sides of the legitimate link. After that selection, these jamming signals are combined with data at the legitimate transmitter,...
The topic of this paper is low-complexity yet high-precision phase-noise mitigation in a realistic cm-wave radio link. The proposed algorithm for phase-noise induced intercarrier interference mitigation works in time domain. We propose a filtering solution that is computationally very simple to implement on silicon. Noise from initial phase-noise estimate is removed with cumulative sum filtering instead...
This paper presents a novel retransmission strategy for communication networks based on index coding. The particular example of OFDMA downlink networks is taken to illustrate its efficacy. The benefits and challenges in using index coding as a transmission strategy are highlighted. The paper concludes with characterization of expected index coding gain in terms of channel parameters.
In this paper we introduce an improvement of the symbol request sharing (SRS) cooperative scheme, namely the adaptive SRS (A-SRS). Both schemes are designed for systems assuming a source and several receivers with one target receiver among them which is denoted as destination. In addition, the source or the receivers are not restricted to be static. These schemes follow a request-answer strategy,...
The RAN architecture splitting BS functions within PHY layer is prototyped and evaluated to confirm its validity. Experiments show that mobile fronthaul optical bandwidth is reduced by 90% compared to conventional C-RAN maintaining wireless performance.
We propose a new selective multi-carrier index keying in orthogonal frequency division multiplexing (OFDM) systems that opportunistically modulate both a small subset of sub-carriers and their indices. Particularly, we investigate the performance enhancement in two cases of error propagation sensitive and compromised device-to-device (D2D) communications. For the performance evaluation, we focus on...
With recent advances and interests in underwater wireless optical communications (UWOC), a proper understanding of optical propagation in underwater environment is more essential. In this paper, we study the channel model taking absorption, scattering and turbulence into account. Then we consider average (ergodic) channel capacity of UWOC links under weak turbulence. The fading coefficient of weak...
Complex Wishart matrices represent a class of random matrices exploited in a number of wireless communication problems. This paper analyzes the first and second order statistical moments of complex Wishart matrices' minors. This enables to derive new closed-form approximations for the outage capacity of multiple input multiple output (MIMO) systems operating in Rayleigh fading channels at any signal-to-noise...
A simple low-sampling-rate receiving scheme is proposed for W-band OFDM-RoF systems. Using the proposed preprocess, aliasing-free subcarriers can be received, and employing the optimized delays to ADCs can achieve the performance insensitive to sampling rate.
This paper presents a novel scheme of adaptive self-organization network (SON) by integrating cognitive radio (CR) with inter-cell interference coordination (ICIC) for LTE-A heterogeneous networks (HetNets). Particularly, we take advantage of the spectrum sensing function from CR and the radio resource layering function from ICIC. Our work addresses the issues of smart low-power node (SLPN) development,...
Pico eNodeBs (PeNB) are deployed in 3GPP LTE-A networks to improve the overall performance. However, the inter cell interference may become severe without suitable coordination. In this paper, a dynamic distributed power control scheme is proposed. First, each PeNB gathers information about pico user equipments (PUE) in this cell and macro user equipments (MUE) this PeNB is interfering. Then, in power...
The nature of wireless channel in a wireless body area network is highly dynamic and hence, any static design is trivially sub-optimal. In this paper we propose a cross-layer channel-adaptive framework to adjust the MAC frame body length of the data packets. We propose two different approaches to incorporate the impact of the time-varying channel gain in the transmission policy aiming to improve the...
Wireless heterogeneous networks have emerged as a new paradigm to meet the fast increasing wireless capacity and coverage demands. Coordinated Multipoint Processing (CoMP) and Precoding are two promising techniques to further improve the network capacity and spectral efficiency. This paper presents an optimal intra-cell CoMP resource allocation scheme in a wireless heterogeneous network and explores...
In this paper, a non-coherent base station cooperation (NC-BSC) scheme is examined for the downlink OFDMA wireless cellular networks. We formulate the resource allocation in the scheme as a subcarrier allocation optimization problem with equal power allocated on each subcarrier. To balance the tradeoff between system throughput and fairness, a multi-cell scenario controllable fairness is extended...
The use of opportunistic multicast scheduling (OMS) for systems with multiple multicast groups is examined in this work. Here, a general downlink scenario where a single basestation is to transmit independent data streams to multiple groups of users is considered. Within each group, common information is transmitted, but between groups, the source information is independent. In the literature, the...
Exponential effective signal-to-interference plus noise ratio mapping, also known as EESM, is a link-to-system level (L2S) interface that have been successful to exchange information between a system-level simulator (SLS) and a link-level simulator (LLS). However, in some special adverse conditions, such as where the Gaussian distribution does not hold for the interference term, the accuracy provided...
In this paper, a novel differential precoding scheme is proposed for LTE systems. The proposed scheme utilizes a differential codebook to update the precoding matrix. Due to the temporal correlation of adjacency time slots in temporally correlated channels, the current precoding matrix is restricted in a limited scope around the previous precoding matrix. This approach utilizes the differential information...
In this work, we propose an adaptive distributed network-channel coding for a cooperative multiple access channel where M users cooperatively communicate with a common base station. The scheme is based on the recently proposed generalized dynamic-network codes (GDNC), in which the network code design that maximizes the diversity order was recognized as equivalent to the design of linear block codes...
A distributed optimization algorithm is presented for resource allocation in wireless relay networks. This algorithm is particularly useful in multiple-source, multiple-relay wireless networks employing fractional cooperation, in which each relay contributes only a fraction of its resources to each source; in this case, the algorithm is used to find the optimal fractions. The advantage of this distributed...
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