Results 291 to 300 of about 375,907 (328)

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
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MISO Amplify Forward scheme and its viability

2012 International Conference on Computing, Networking and Communications (ICNC), 2012
In this paper, we consider a MISO equivalent of a three node cooperative communication system as described in [1] and compare its energy efficiency with a pure relaying scheme. Specifically, we first quantify the transmit energy required to maintain a target error probability at the destination in an Amplify Forward (AF) based MISO scheme.
Narayanan Krishnan, Bala Natarajan
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Distributed Amplify-and-Forward with Ring-TCM Codes

2010 7th IEEE Consumer Communications and Networking Conference, 2010
This paper proposes a new distributed Amplify-and-Forward (AF) scheme which is integrated with the Ring-Trellis Coded Modulation (TCM) codes in order to achieve both high spectral efficiency and large diversity gain. In the distributed AF scheme, more users cooperate with each other.
Li Chen 0013, Rolando A. Carrasco, Ian J. Wassell   +2 more
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
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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
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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.
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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
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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
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Energy efficiency contours for amplify-and-forward and decode-and-forward cooperative protocols

2012 8th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP), 2012
In this paper we compare the energy efficiency of different cooperative schemes by means of energy efficiency contours. We consider a three-nodes cooperative scenario, employing either the amplify-and-forward (AF) or the decode-and-forward (DF) protocol.
Marcos Tomio Kakitani, Richard Demo Souza, Muhammad Ali Imran 0001   +2 more
openaire   +1 more source