نتایج جستجو برای: multiple access relay channel

تعداد نتایج: 1255238  

Journal: :CoRR 2013
Kiran Venugopal Vishnu Namboodiri B. Sundar Rajan

Modulation schemes for two-way bidirectional relay network employing two phases: Multiple access (MA) phase and Broadcast (BC) phase and using physical layer network coding are currently studied intensively. Recently, adaptive modulation schemes using Latin Squares to obtain network coding maps with the denoise and forward protocol have been reported with good end-to-end performance. These sche...

2005
Raul L. de Lacerda Neto Mérouane Debbah

Ultra-WideBand (UWB) has been recently presented as a promising radio technology due to the large bandwidth available. This feature enables point to point high data rates at short range as well as high temporal resolution with long channel impulse reponses (CIR). In this paper, we present an original multiple access scheme called Channel Division Multiple Access (ChDMA), where we use the CIR as...

2016
R. Raja Kumar

We investigate a multiple input multiple output (MIMO) relay broadcast channel (RBC) with full cooperation between users. A beamforming and combining design is proposed based on singular value decomposition (SVD) of the channel matrix between users. Then, users can simultaneously relay each other’s information on the same frequency band with zero interference from each antenna’s transmit signal...

Journal: :EURASIP J. Wireless Comm. and Networking 2012
Gordhan Das Menghwar Akhtar Ali Jalbani Mukhtiar Memon Mansoor Hyder Christoph F. Mecklenbräuker

Because of the gains like diversity, throughput, and the coverage extension provided by the multiple-input multipleout (MIMO) systems, it has been part of the various wireless communications standards. However, to reap the benefits offered by MIMO systems in size-constrained nodes, used in wireless communications, has been a challenging issue. To address this challenge, cooperative communicatio...

Journal: :IEICE Transactions 2011
Jun Zou Ming Ding Hanwen Luo

This letter proposes a robust joint linear precoding scheme based on the minimum mean squared error (MMSE) criterion for amplifyand-forward (AF) multiple-input multiple-output (MIMO) relay broadcast systems with limited feedback, where only the quantized channel direction information (CDI) of the forward channel is available for the base station (BS) and the relay station (RS). The proposed sch...

2000
Asimakis Tzamaloukas J. J. Garcia-Luna-Aceves

The medium-access control (MAC) protocols for wireless networks proposed or implemented to date based on collision-avoidance handshakes between sender and receiver either require carrier sensing or the assignment of unique codes to nodes to ensure that intended receivers hear data packets without interference from hidden sources. We present and analyze a protocol that we call channel-hopping mu...

Journal: :Computer Networks 2009
Yuedong Xu John C. S. Lui Dah-Ming Chiu

Network coding has become a prominent approach to improve throughput of wireless networks. However, most of work in the literature concentrates mainly on 802.11-like random access networks. New technologies such as OFDMA (orthogonal frequency division multiple access), offer new opportunities for employing network coding. This paper considers how to apply the practical network coding scheme in ...

2016
Nuri Kapucu Mehmet Bilim Ibrahim Develi

This paper presents analytical solutions for the performance of a single relay aided amplify-and-forward (AF) direct sequence code division multiple access (DS-CDMA) system over Rayleigh/Nakagami-m fading channels. The source-destination channel is assumed to be Rayleigh distributed while relay-destination link is Nakagami-m distributed. First, a cumulative distribution function (CDF) is derive...

Journal: :IEEE Transactions on Information Theory 2017

2008
Ahasanun Nessa Qinghai Yang

Wireless Relaying is a promising solution to overcome the channel impairments and provides high data rate coverage that appears for beyond 3G mobile communications. In this paper we present end to end BER performance of dual hop wireless communication systems equipped with multiple Decode and Forward relays over Rayleigh fading channel with the best relay selection. We compare the BER performan...

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