نتایج جستجو برای: way relay channel

تعداد نتایج: 683447  

Journal: :CoRR 2014
Lennart Gerdes Christoph Hellings Lorenz Weiland Wolfgang Utschick

This paper considers the partial decode-and-forward (PDF) strategy for the Gaussian multiple-input multiple-output (MIMO) relay channel. Unlike for the decode-and-forward (DF) strategy or pointto-point (P2P) transmission, for which Gaussian channel inputs are known to be optimal, the input distribution that maximizes the achievable PDF rate for the Gaussian MIMO relay channel has remained unkno...

2011
Haim Permuter Ziv Goldfeld

i−1 1) Fig. 1. Relay channel. The user, aided by the relay, sends the message M to the receiver. The relay channel is a channel in which there is one sender and one receiver with an intermediate node that acts as relay to help the communication. The channel model consists of four finite sets X , X 1 , Y, Y 1 , and a collection of conditional pmfs p(y, y 1 |x, x 1) on X × X 1 × Y × Y 1. The send...

In this paper, an interval approach is presented to achieve perfect selectivity and maximum sensitivity in distance relay zones, considering uncertainties. For this purpose, first, the uncertainties affecting the settings of the three zones of a distance relay are discussed. Then, by using the Monte-Carlo simulation, the uncertainties are modelled and the impedances seen by the distance relay a...

Journal: :EURASIP J. Adv. Sig. Proc. 2014
Christos Mavrokefalidis Eleftherios Kofidis Athanasios A. Rontogiannis Sergios Theodoridis

Preamble-based channel estimation in filter bank-based multicarrier (FBMC) systems using offset quadrature amplitude modulation (OQAM) has been extensively studied in the last few years, due to the many advantages this modulation scheme can offer over cyclic prefix (CP)-based orthogonal frequency division multiplexing (OFDM) and in view of the interesting challenges posed on the channel estimat...

2015
Jinhong Fan Chaowei Yuan Ke Xiao

In this paper, we consider the transmission scheme for asymmetric decode-and-forward (DF) multi-input multi-output (MIMO) two-way relay system with channel estimation error. In order to transmit with asymmetric data rates from the relay to the receivers according to their individual link qualities, we propose a novel transmission scheme for the broadcast phase by employing a priori bit informat...

2015
R. Jeyanthi N. Malmurugan V. Kejalakshmi

In cooperative relay networks, Channel State Information (CSI) is estimated at receiver. The estimated CSI is sent back to the relays through feedback link. This estimated CSI is often outdated due to feedback delay and the estimated outdated CSI is used for relay selection and detection which affects the performance of the system. The outage and error rate performance of the relay selection sc...

2017
Yishan Su Guangyao Han Xiaomei Fu Naishen Xu Zhigang Jin

Physical layer security is an attractive security mechanism, which exploits the randomness characteristics of wireless transmission channel to achieve security. However, it is hampered by the limitation of the channel condition that the main channel must be better than the eavesdropper channel. To alleviate the limitation, cooperative communication is introduced. Few studies have investigated t...

Journal: :CoRR 2011
Hyunseok Chang Sae-Young Chung

In this paper, we study the interference relay-without-delay channel which is an interference channel with a relay helping the communication. We assume the relay’s transmit symbol depends not only on its past received symbols but also on its current received symbol, which is an appropriate model for studying amplify-and-forward type relaying when the overall delay spread is much smaller than th...

Journal: :EURASIP J. Wireless Comm. and Networking 2011
Suhua Tang Hiroyuki Yomo Tetsuro Ueda Ryu Miura Sadao Obana

Network coding is an effective method to improving relay efficiency, by reducing the number of transmissions required to deliver data from source(s) to destination(s). However, its performance may be greatly degraded by rate mismatch, which is seldom touched in previous works and remains a challenge. In this paper, we reinterpret network coding as a mapping of modulation constellation. On this ...

Journal: :IET Communications 2017
Erfan khordad Soroush Akhlaghi Meysam Mirzaee

This paper concerns maximizing the minimum achievable secrecy rate of a two-way relay network in the presence of an eavesdropper, in which two nodes aim to exchange messages in two hops, using a multi-antenna relay. Throughout the first hop, the two nodes simultaneously transmit their messages to the relay. In the second hop, the relay broadcasts a combination of the received information to the...

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