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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...
This paper studies the end to end distortion of transmission of a layered encoded source over a cooperative relay broadcast channel. A jointly optimised source-channel code is proposed to multicast a two-layered encoded source to two destinations. A degraded discrete memoryless broadcast channel is assumed, where the first destination with better channel conditions decodes both layers consisting of...
In this paper, we investigate the performance of energy harvesting relay-aided cooperative system wherein, the source node transmits hierarchical signal to the relay and destination nodes. But, since in cooperative networks relays are often nearer to the source than the destination, the relay node is able to decode multi-resolution signal whereas, the destination is only capable of detecting the most...
We present in this paper a MAC layer protocol capable to cope with lossy links in interference-prone wireless environments. Our approach exploits the recent advances in information theory and physical layer coding by relaying at intermediate nodes corrupted messages. To do so, we rely on collaboration between nodes and on a complete rethinking of the header structures and wireless access techniques...
In this paper we investigate the achievable sum-rates of device-to-device (D2D) communication assisted by decode-and-forward (DF) relay node. Firstly we introduce the operation principles of three communication transmission modes which are named as classical cellular communication mode, direct D2D communication mode and two-way-DF-relayed D2D communication mode. Then we derive the corresponding expressions...
We investigate the application of network coding to file transfers from a single source to multiple destinations in a two-hop ad hoc relay network that consists of half-duplex packet radios. Our network-coded file distribution techniques make simultaneous use of a pair of relay nodes. All transmissions by the source and the relay nodes employ packet-by-packet adaptive modulation and channel coding...
Physical-layer network coding (PNC) can significantly improve the throughput of wireless communication systems by exploiting signal superimposition at relays. It is practically challenging to achieve symbol alignment in PNC. In this paper, we study the impact of the signal power loss and the inter-symbol-interference (ISI) on the system performance when the symbols are not aligned. We show that when...
Now a days mobile phone has become a part of our daily life. Due to low cost of mobile phones, mobile phones are widely used for home automation. In this paper a remotely operated mobile phone controlled home appliances system is proposed. It is a DTMF (dual- tone multiple-frequency) based system consists of two mobile phones, DTMF decoder and ATmega8 microcontroller. One mobile phone is used as remote...
We describe models based on a multilayer topology for wireless multi-hop networks employing linear physical layer network coding, and accounting for the scheduling of transmission in such networks. We discuss algebraic frameworks for the network code mappings, and requirements for unambiguous decoding at the destination. With reference to some simple examples we show that a framework based on binary...
In this work, we propose the construction of distributed turbo network codes that have close-to-outage probability performance over the quasi-static fading multiple-access relay (MARC) channel, where two users share a common relay to transmit their information to the destination. Our designs are based on full-diversity channel multiplexing schemes initially developed for point-to-point block fading...
In this paper, we propose to optimize the distribution of the average relay energy in a Cooperative Automatic Repeat reQuest (C-ARQ) scheme. We consider wireless transmissions over Rayleigh fading channels between two sources nodes, one relay node and one destination node. We propose to use specific relay and destination treatment for different possible cases. When only one received packet is detected...
This paper presents Powerline Physical-layer Network Coding (Powerline-PNC), a powerline communication architecture that employs physical-layer network coding (PNC). As the first work that applies PNC in powerline communication, we show that Powerline-PNC improves the throughput of bidirectional information interchange in the powerline network by 100% at the SNR cost of 3dB. Specifically, we design...
This paper considers the two-user interference relay channel where each source wishes to communicate to its destination a message that is confidential from the other destination. Furthermore, the relay, that is the enabler of communication, due to the absence of direct links, is untrusted. Thus, the messages from both sources need to be kept secret from the relay as well. We provide an achievable...
This paper investigates the iterative decoding for spectrally efficient two-way relay (TWR) communications in which two end nodes exchange information through a relay (R). With the use of physical-layer network coding (PNC), information exchange throughput can be significantly improved as only two orthogonal time slots (TS) are required to realize both the multiple access (MAC) and the broadcast (BC)...
In this paper, we investigate how to adapt a composite decode-forward (DF) two-way relaying scheme to fading links. We develop a maximum entropy (ME) quantization algorithm to feed back the link magnitudes such that the transmitters are able to perform link adaptation. The ME algorithm outperforms that of Lloyd-Max in mid and high range SNR, and performs comparably at low SNR. With just one bit of...
To account for the problems of long delay, large loss, low SNR and no feedback information in IPN (InterPlaNetary Internet) backbone network, we proposed multihop relay protocols based on fountain codes. The rateless property, erasure property and no need feedback of fountain codes, which combined the advantage of relay make us propose the Random Linear Network Coding (RLNC) based and LT code based...
We propose two coding schemes for discrete memoryless multicast networks with rate-limited feedback from receivers and relays to the transmitter. The coding schemes are based on block Markov coding, joint backward decoding and hybrid relaying strategy. In each block, the receivers and relays compress their outputs and send the compression indices to the transmitter through the feedback links. In the...
This paper focuses on two-way relaying (TWR) system, where two source nodes exchange information with each other simultaneously via the relay node. We proposes a denoise-and-forward two-way relaying (DNF-TWR) scheme using non-coherent multiple differential phase-shift keying (M-DPSK) modulation when the channel state information (CSI) is unknown. Firstly, we design the denoising mapping function at...
Applying network coding to a wireless cooperative communication network always proves beneficial, in terms of gains in spatial diversity, improved coverage and channel capacity. In this paper, a relay-selection method for a bidirectional (two-way) wireless cooperative communication system is proposed. A single best relay node or set of relay nodes are selected to jointly forward the combined data...
Coding scheme for discrete memoryless multicast networks with rate-limited feedback from the receivers and relays to the transmitter is proposed. The coding scheme is based on block-Markov coding, joint backward decoding and hybrid relaying strategy. In each block, the relays use partial decode-forward strategy to decode part of the source message. Meanwhile, the receivers and relays use compress-forward...
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