نتایج جستجو برای: amplify and forward

تعداد نتایج: 16837393  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده برق و کامپیوتر 1392

در دهه ی گذشته مخابرات مشارکتی برای غلبه بر کاستی های ارتباطات بی سیم ‏از طریق افزایش قابلیت اطمینان سیستم,‎ ‎‏افزایش‎ مرتبه چندگانگی سیستم و کاهش توان ارسالی نسبت به حالت انتقال مستقیم,‎‎‎ توجه زیادی را به خود جلب کرده است. رله های مشارکتی با ایجاد چندین منبع مجازی که همان اطلاعات منبع اصلی را انتقال می دهند باعث می شوند که در گره مقصد نمونه های متعدد مستقلی از سیگنال ارسالی از منبع را دریافت ...

M. Shirvanimoghaddam S. Movassaghi

In this paper two different rateless transmissionschemes are developed. In the proposed scheme, relay node candecode and forward the message to the destination if they areable to decode it, or amplify and forward the message to thedestination. Based on the analysis and simulation resultsprovided in this paper, the proposed method has bettertransmission time than the scheme which only the relay ...

In this paper, power efficiency (PE) of a relay interference channel including multiple transmitter nodes, multiple relay nodes and multiple destination is investigated. It is assumed that the destination and transmitter nodes are equipped with a few number of antennas but the relay nodes have a large number of antennas. Amplify-forward and decode-forward schemes by using MRT/MRC and ZF process...

Journal: :International Journal of Communications, Network and System Sciences 2014

Journal: :IEEE Journal on Selected Areas in Communications 2008

Journal: :IEEE Signal Processing Letters 2018

Journal: :journal of electrical and computer engineering innovations 2013
m. shirvanimoghaddam s. movassaghi

in this paper two different rateless transmissionschemes are developed. in the proposed scheme, relay node candecode and forward the message to the destination if they areable to decode it, or amplify and forward the message to thedestination. based on the analysis and simulation resultsprovided in this paper, the proposed method has bettertransmission time than the scheme which only the relay ...

2011
L. Chen

Introduction: Cooperative communications [1] create diversity gains for network users with a single antenna. The classical cooperative scheme consists of two orthogonal time slots (TS): a broadcasting TS for a source (S) to transmit its signal to the intended destination (D), and a relaying TS for a relay (R) to retransmit S’s signal to D. There are amplify-and-forward (AF) and decode-and-forwa...

2007
Charlotte Hucher Ghaya Rekaya

We propose an Adaptive AF protocol based on a new selection criterion, a function of the instantaneous capacities of all possible transmission schemes. Both outage probability and simulation results show that the Adaptive AF has better performance than the best known AF protocol (NAF) and solves the problem of the bad performance at low SNR.

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