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This paper investigates a wireless-powered cooperative communication network consisting of a source, a destination and a multi-antenna decode-and-forward relay. We consider the relay as a wireless-powered node that has no external power supply; but it is equipped with an energy harvesting (EH) unit and a rechargeable battery such that it can harvest and accumulate energy from radio-frequency signals...
In this paper, we propose a new hierarchical modulation scheme for DVB-NGH to improve the performance of LP (Low-Parity) signals by applying a conventional constellation-rotation method to the LP signals with virtually no loss of performance in the HP (High-Parity) signals. The improvement of the LP signals is mainly due to the increased diversity gain caused by the constellation-rotation method which...
Frequency-domain equalization (FDE) is prior than time-domain equalization in complexity. FDE is based on the cyclic signal property within a data block. This means that the channel must remain constant during this time interval. But in fast fading environments, the channel is time-variant. In order to deal with this problem, a variety of sub-block based FDE techniques have been proposed, but these...
In this paper a cognitive radio network is considered where a licensed primary user and an energy harvesting secondary (cognitive) user co-exist, and relaying protocols are proposed where the cognitive user acts as a relay for the primary signal in return for spectrum access. We analyze two relaying paradigms, namely, time-splitting cooperative spectrum sharing (TS-CSS) relaying and power sharing...
Highly dense wireless networks is one of the most important solutions for spectrum shortage expected by 2020. Motivated by a generally assumption that direct links between users in HD-MWR networks are usually ignored, this paper proposes high-dense multiway relay (HD-MWR) networks exploiting available direct links as side information (SI) to serve even higher number of users or devices required for...
In order to improve the error performance of M-ary differential chaotic shift keying (DCSK) systems over multi-path fading channel, two types of iterative structures have been employed in receiver design. One is joint source-channel decoder (JSCD), the other is iterative receiver (IR). Although several works have separately addressed the advantages of IR and JSCD, it is not clear which design provides...
Densely deployed wireless networks is one of the most important solutions for spectrum shortage expected by 2020 with a huge economic impact. This paper proposes decoding schemes for high- dense vehicular multiway multirelaying (HDV-MWMR) systems comprising multiple multiway relays to serve huge number of users or devices. Due to the nature of huge number, instead of using perfect scheduling, we consider...
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...
This paper focuses on the achievable secrecy throughput in the hybrid automatic repeat request (HARQ) protocol over quasi-static Rayleigh fading channels for the wiretap channel model. We propose a scheme that ensures reliable and secure communication utilizing polar coding in conjunction with the HARQ protocol. Security and reliability is ensured even when the instantaneous power of the wiretap channel...
This paper considers differential amplify-and-forward (D-AF) relaying system employing differential encoding and decoding over time-varying fading channels. A practical multiple-symbol differential sphere detection (MSDSD) is designed to overcome the error floor, which the convectional 'two-symbol' differential detection (CDD) reaches at high signal-to-noise ratio region in fast-fading channels. The...
The recently developed orthogonal frequency-division multiplexing relying on index modulation (OFDM-IM) is adopted to the in-vehicle power line communications (PLCs) in order to combat the deleterious effects of frequency-selective fading and impulsive noise, whilst improving the energy efficiency of data communications. Furthermore, the low density parity check (LDPC) coding is invoked to further...
Recent information theoretic results have shown that interference can be exploited in wireless relay-assisted networks to secure the information communicated between two legitimate network nodes from the potentially untrusted nodes. In this paper, we consider a two-hop multi-relay network with untrusted relays, where the destination node, aiming at securing the source node's information signal, designs...
The space-time trellis coded orthogonal frequency division multiplexing (STTC-OFDM) has been implemented with the conventional maximum-likelihood decoder for multiple antenna transmission since the STTC-OFDM was initially proposed. In this paper, a modified maximum-likelihood decoding method with the utilization of a multiplexer at the transmitter and a demultiplexer at the receiver to isolate each...
In this paper, we study the performance of wireless information and power transfer in the presence of statistical queuing constraints. We consider harvest-then-transmit protocol in which users first harvest energy from a dedicated source and then transmit information through an uplink multiple access channel (MAC). Each user is subject to limitations on the buffer overflow probability, specified by...
In this paper, we investigate energy cooperation among sustainable cooperative relay nodes, which adopt decode- and-forward (DF) relaying. The relay nodes work on either information decoding (ID) mode or energy harvesting (EH) mode when receiving the signal from the source. Due to different harvested energy at the relay nodes, effective energy cooperation can benefit the energy efficiency, but suffer...
In this paper, an adaptive cooperation scheme is presented for bidirectional communication between two nodes, where the non-relay direct transmission and the one- or two-way relaying diversity transmission are jointly considered. The results show that the proposed scheme obtains lower outage probability than the conventional bidirectional communication methods.
Power control policies in the fading multiple-access channels (MAC) with quality of service (QoS) constraints and random arrivals are studied. Perfect channel side information (CSI) is assumed to be available at both the transmitters and the receiver. Two types of Markovian sources, namely discrete Markov source and Markov fluid source, are considered. The maximum average arrival rates that can be...
In this paper, we investigate low-complexity, receiver-driven strategies for the transmission of two correlated sources in a multiple access quasi-static fading channel. We consider two different transmission modes at the physical (PHY) layer depending on the average signal to noise ratio (SNR) of the involved Rayleigh fading channels. The two modes that are allowed are orthogonal transmissions and...
In this paper, we propose a multilevel lattice construction, employing binary Reed-Muller codes, for the Rayleigh block fading channel. The construction is performed on a binary two-dimensional lattice partition chain, and Reed-Muller codes are chosen according to capacity rule. The lattice construction based on number-theoretical concepts is explained, and the system's performance is shown for various...
The paper studies the scenario of wireless multicast with a single transmitter and a relay that jointly deliver successively refined (or multi-resolution) sources to multiple receivers. By taking the end-to-end mean square error distortion (EED) as the performance metric, the problems of power allocation at the transmitter and relay are formulated. Due to nonlinearity of the formulations, a generalized...
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