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Service interruptions from mobility events, such as handovers and connection failures, are some of the major impairments for fulfilling the ultra-reliability requirements in fifth Generation (5G) mobile networks. One of the solutions to tackle the aforementioned challenges is multi-connectivity with Single Frequency Network (SFN) transmission, which refers to noncoherent joint transmission of a signal...
Effective Capacity (EC) indicates the maximum communication rate subject to a certain delay constraint while effective energy efficiency (EEE) denotes the ratio between EC and power consumption. In this paper, we analyze the EEE of ultra-reliable networks operating in the finite blocklength regime. We obtain a closed form approximation for the EEE in Rayleigh block fading channels as a function of...
In this paper, we investigate the sum-rate maximization in the Device-to-Device (D2D) communication underlaying cellular networks, where many cellular users (CUs) share the uplink resource with the D2D pairs. We show that the system sum- rate maximization problem can be formulated as a mixed integer non-linear programming problem, which is NP-hard in general. We circumvent this difficulty by applying...
We consider a hybrid satellite-terrestrial spectrum sharing system wherein multiple terrestrial secondary networks coexist with a primary satellite network. We propose an amplify-and-forward based cooperative spectrum sharing protocol by employing an opportunistic secondary network selection (OSNS) scheme. The best secondary network is selected to minimize the outage probability of primary satellite...
This paper provides an enlightment into the pairwise error probability (PEP) of multi-antenna (MIMO) space-time code (STC) based selective decode then forward cooperative scheme considering Nakagami-m channel. We examine the pairwise error probability at the destination node, and we have formulated the closed form expression for pairwise error probability. We have achieved full diversity order in...
In following paper, firstly we have considered a 2-hop relay network in which more than one relay is accessible. And then analysis of relay selection for the decode-and-forward cooperative protocol for minimizing the outage probability over a short-term power constraint is done. Investigation of effect of power control in selecting a relay from view of capacity is done. Here an assumption is made...
In this paper, the power allocation in cognitive radio networks is studied by considering the power amplifier non linearity causing adjacent channel interference to the primary receivers and disturbing the received signal to noise ratio in the secondary receivers. Dynamic range of the power amplifier is assumed to be limited. Throughput is derived for probability of data transmission between the secondary...
Physical layer security has attracted tremendous attention in recent years. This paper proposes a novel transmit antenna selection and cooperative communication design to enhance physical layer security. The proposed scheme is brought up in order to take full advantage of macro diversity, so that security performance can be enhanced to some extent. Specifically, we consider the scenario which contains...
The frequency spectrum is an expensive and limited resource while the massive demand of telecommunication services both of data and number of connection continue to raise. The ordinary network becomes denser to meet the growing needs of the services. It can be done by introducing more cells in the network, with lower coverage than the ones that already exist or simply by splitting the existing cell,...
In this paper, we investigate the impact of relative distance and large-scale fading of legitimate user and eavesdropper on the artificial noise (AN) assisted secrecy scheme in a multiple-input single-output (MISO) wiretap channel. We show that AN does not always improve the achievable ergodic secrecy rate (ESR), and provide an exact signal-to-noise ratio (SNR) threshold below which AN does not work...
In this paper, we study three cooperative transmission schemes by use of amplify-and-forward (AF) relaying strategies. It is assumed that there is one source, one destination and several AF-relays. First, a parallel-relay strategy is considered wherein the transmitted message from the source is received by each relay independently. Then, the relay retransmit the message by use of AF relaying to the...
Cooperative communication is a promising technique, which can greatly improve the performance and extend the coverage of cellular networks. In this paper, the resource allocation problem is investigated for multi-carrier amplify-and-forward (AF) relay assisted multi-access networks with multiple users and subcarriers. The joint relay selection and subcarrier allocation problem is formulated as a combinatorial...
In this paper, an optimal algorithm is proposed for the joint power allocation and relay assignment problem in OFDM relay networks. The network model consists of single-source single-destination with N half-duplex decode-and-forward (DF) relays. The source node uses orthogonal frequency division multiplexing (OFDM) to transmit information to relays where each serves one subcarrier. Our objective is...
Fractional frequency reuse (FFR) is an efficient management technique to eliminate inter-cell interference (ICI) in multi-cell orthogonal frequency division multiple access (OFDMA) networks through inter-cell coordination. Generally, the derivations of throughput and coverage probability are treated as separate problems or investigated in different ways. In this paper, we derive average cell throughput...
In this paper, we consider video communication over fading channel, where the perfect instantaneous channel state information (CSI) is available at both sender and receiver. Most of existing coding schemes are inefficient in this communication scenario. The reason is that for digital coding scheme, it has high coding efficiency but unavoidably leads to the cliff effect; while for analog scheme, it...
Robust adaptive modulation (AM) is a promising technique to improve the spectrum efficiency (SE) of high speed railway (HSR) communication system. Although robust AM transmission schemes with assumption of block fading channel have been extensively investigated, which are no longer valid in the fast time-varying channel due to the channel variation in frame duration. This paper investigates the optimum...
In this study, we investigate the outage performance of full-duplex fixed-gain amplify-and-forward (AF) relaying systems over Rayleigh fading channels. New exact outage probability expression of full-duplex fixed-gain AF relaying is derived analytically in single-integral form by using the cumulative distribution function (CDF) approach. The analytical results for outage performance are verified by...
Communication systems need for regeneration of consistent information by controlling errors in a noisy environment. This is accomplished by incorporating suitable forward error correcting coding techniques into the system. In this context, Turbo Code (TC) is regarded as one of the high-performance forward error correcting codes whose BER performances tends to the “Shannon limit”. An advanced form...
In this paper, we propose a self-organized resource allocation method in a macrocell/picocell heterogeneous network employing Cell Range Expansion (CRE). To protect expanded Pico User Equipments (ePUEs) from severe Macro Base Station (MBS) interference in downlink, in the conventional method, MBS makes use of reduced power Almost Blank Subframes (ABSs) where ePUEs can be scheduled. However, this severely...
The analytical evaluation of the average bit error rate (ABER) performance of a digital multihop transmission system operating in the presence of co-channel interference and Rayleigh fading is presented. It is assumed that the number of interferers at each relay node and the destination is a binomial random variable that belongs to a binomial point process. Analytical expressions for the ABER of Amplify-andForward...
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