Results 231 to 240 of about 134,511 (264)

Relay-Aided Amplify-and-Forward Powerline Communications

IEEE Transactions on Smart Grid, 2013
Powerline communications (PLC) is a favorable technique for many smart grid applications. By transmitting information over the existing powerline infrastructure, PLC has the benefit of low deployment cost. However, due to low transmit power, limited bandwidth, and harsh channel conditions, reliable long-distance and high-capacity PLC is challenging ...
Xilin Cheng, Rui Cao, Liuqing Yang 0001
openaire   +1 more source

Hybrid Decode-Forward Amplify-Forward Relaying with Opportunistic Layered Multicast

2018 10th International Conference on Wireless Communications and Signal Processing (WCSP), 2018
In this paper, we propose a hybrid decode-forward & amplify-forward relaying with opportunistic layered multicast (HDAF-OLM) scheme for a cellular system with multiple relays and multiple users. The scheme integrates hybrid decode-forward and amplify-forward with non-orthogonal multiple access transmission (HDAF-NOMA) scheme and layered multicast ...
Yifan Liu, Yang Liu, Guannan Ma
openaire   +1 more source

Linear theory of multistage forward-wave amplifiers

Physical Review E, 1999
A small-signal theory describing multistage gyro-traveling-wave tubes (gyro-TWTs) is developed. Multistage configurations of gyro-TWTs as well as conventional TWTs seem to be attractive because of their principal ability to operate stably with a high gain, since the stability can be provided by a shortening of each stage while the gain increases with ...
G S, Nusinovich, M, Walter
openaire   +2 more sources

On the Outage Probability in Amplify-and-Forward Relay Channels

2009 IEEE Wireless Communications and Networking Conference, 2009
The overall relay channel from the source to the destination via relays has temporal properties quite different from any cellular channel. This work presents a study for time-dependent performance of relay channels for both fast-fading and log-normal shadow fading in terms of average outage duration, frequency of outage and probability of outage ...
Dorra Ben Cheikh Battikh, Ahmed Saadani
openaire   +1 more source

Multiple-Access Capabilities of Amplify-and-Forward Relaying

2015 IEEE Global Communications Conference (GLOBECOM), 2014
This paper is concerned with the performance of a gateway connecting a group of independent users to their destinations and employ the random slotted- Aloha type protocol. The users are isolated from their destinations and the only way to communicate with their destinations is through the common gateway which acts as a blind amplify and forward relay ...
Abdurrahman Alfitouri, Khairi Ashour Hamdi   +1 more
openaire   +1 more source

Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links

IEEE Communications Letters, 2009
We consider a two-hop relay link in which orthogonal frequency division multiplexing (OFDM) is used on both hops. Under a joint sum-power constraint, our aim is to allocate power over subcarriers on the two hops such that the instantaneous rate of the relay link is maximized.
Yong Li 0001, Wenbo Wang 0007, Jia Kong, Mugen Peng   +3 more
openaire   +1 more source

Robust Cooperative Relaying in an Amplify-and-Forward Network

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011
It has been shown that cooperative communication can significantly improve performance by utilizing distributed relay nodes. In most cases, cooperative communication systems have been designed and evaluated assuming perfect channel state information (CSI).
Gubong Lim, Leonard J. Cimini Jr.
openaire   +1 more source

Multicarrier HF communications with amplify-and-forward relaying

2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications, 2011
High-frequency (HF) radio communication has been recognized as the primary means for long-range wireless communications since the advent of radio. With its unique features, HF communication continues to be used for a wide range of civilian, government and military applications as a powerful alternative to a myriad of more sophisticated communication ...
Mohammad Reza Heidarpour, Murat Uysal
openaire   +2 more sources

Compressed cooperation in an amplify-and-forward relay channel

2015 IEEE 26th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2015
The theory of compressed sensing (CS) is very attractive in that it is possible to reconstruct sparse signals with a sub-Nyquist sampling rate. Recently many researches have applied CS as the channel code, and show its great potential in communication systems. This paper studies the compressed cooperation in an amplify-and-forward (CC-AF) relay channel,
Wenbo Xu 0003, Yifan Wang 0006, Jiaru Lin, Lixi Fu   +3 more
openaire   +1 more source

A Practical Differential Receiver for Amplify-and-Forward Relaying

IEEE Wireless Communications Letters, 2014
A practical sequence detector of differential phase-shift keying (DPSK) is developed in closed-form for amplify-and-forward (AF) cooperative networks. This detector is applicable for general M-DPSK (M ≥ 2) with arbitrary sequence length N 8 ≥ 1, which includes a single-by-symbol detector as a special case N 8 = 1.
Peng Liu 0015, Saeed Gazor, Il-Min Kim 0001   +2 more
openaire   +1 more source