AAA.rar - In this letter, we propose a simple orthogonal
frequency-division multiplexing (OFDM) scheme for an asynchronous cooperative system, where OFDM is implemented at the source node, and time-reversion and complex conjugation are implemented at the relay nodes. The cyclic prefix (CP) at the source node is used for combating the timing errors the relay nodes.
In this scheme, the received signals at the destination node have the Alamouti code structure on each subcarrier, and thus, it has
the fast symbol-wise ML decoding. It should be emphasized that the relay nodes only need to implement the time-reversion, some sign changes plus to minus, and/or the complex conjugation to the received signals, and no IDFT or DFT operation is needed.It is shown that this simple scheme achieves second-order diversity
gain without the synchronization requirement at the relay nodes.,2016-06-20 22:52:38,下载2次
20130704_085800.rar - In this letter, we consider a half-duplex amplify-andforward two-way relaying network consisting of two sources with each having a single antenna and one relay having two antennas.
For such a system, a distributed orthogonal space-time block code (STBC) is proposed by making use of the Alamouti coding
scheme and jointly processing the signals the two antennas at the relay node. Such a code turns out to make the equivalent channel at each source node be a product of the two Alamouti
channels and thus, is called distributed concatenated Alamouti STBC.,2016-06-20 22:47:35,下载2次
1687-1499-2014-112.rar - In this paper, an Alamouti-coded decode-And-forward protocol with optimum relay selection for three-user one
destination cooperative communications is investigated. Particularly, we design the new protocol that allows the
source node retransmitting the signal to the destination node at the same time as the relay node forwarding the
received signal to the destination node with an Alamouti coding scheme. We exploit the cooperative maximum
ratio combining technique (C-MRC) at the destination for combining a multiple copy of received signals.,2016-06-20 22:44:26,下载2次
1011.1352.rar - In this paper, we propose a distributed Alamouti
space-time code (DASTC) for two-way relay networks employing
a single amplify-and-forward (AF) relay. We first derive closedform
expressions for the approximated average sum-rate of
the proposed DASTC scheme. Our analysis is validated by
a comparison against the results of Monte-Carlo simulations.
Numerical results verify the effectiveness of our proposed scheme
over the conventional DASTC with one-way communication.,2016-06-20 22:41:12,下载1次
ENERGY-DETECTION.rar - Spectrum sensing is the basic and essential mechanisms of Cognitive Radio (CR) to find the unused spectrum. This paper presents an overview of CR architecture, discusses the haracteristics and benefits of a CR. Energy detectionbased spectrum sensing has beenproposed and used widely because it doesnt require transmitted signal properties, channel information, or even the type of modulation. In this paper, a surveyof energy detector over Additive White Gaussian Noise (AWGN), different fading channels for spectrum sensing methodologies in cognitive radio is presented.Theoretical analysis of time domain energy detection and threshold setting is investigated. Cooperative spectrum sensing and a multiple antenna processing based energy detector receptions are also discussed.,2016-06-20 22:31:44,下载3次
AAA.rar - In this letter, we propose a simple orthogonal
frequency-division multiplexing (OFDM) scheme for an asynchronous cooperative system, where OFDM is implemented at the source node, and time-reversion and complex conjugation are implemented at the relay nodes. The cyclic prefix (CP) at the source node is used for combating the timing errors the relay nodes.
In this scheme, the received signals at the destination node have the Alamouti code structure on each subcarrier, and thus, it has
the fast symbol-wise ML decoding. It should be emphasized that the relay nodes only need to implement the time-reversion, some sign changes plus to minus, and/or the complex conjugation to the received signals, and no IDFT or DFT operation is needed.It is shown that this simple scheme achieves second-order diversity
gain without the synchronization requirement at the relay nodes.
Index Terms—Alamouti code, asynchronous cooperative diversity,
orthogonal frequency-division multiplexing (OFDM).,2015-05-12 17:29:25,下载2次
Cooperative-Diversity-using-Soft-Decision-and-Dis - Cooperative communications techniques exploit the
spatial diversity of wireless radio channel by forming antenna arrays in order to achieve Multiple Input Multiple Output (MIMO) performance in multi-user single-antenna environment.,2013-10-02 18:42:24,下载8次
Adaptive-Turbo-Trellis-Coded-Modulation.rar - In this contribution, we propose an adaptive Turbo
Trellis Coded Modulation (TTCM) aided Distributed Space-Time Trellis Coding (STTC) scheme for cooperative communication over quasi-static Rayleigh fading channels.,2013-10-02 18:38:15,下载11次
A-convolutional-based-distributed-coded-cooperati - In this paper, we consider a coded cooperation diversity scheme that is suitable for L-relay channels that operate in the decode–forward mode. The proposed scheme is based on convolutional coding, where each codeword of the source node is partitioned into two frames that are transmitted in two phases.,2013-07-10 19:03:19,下载7次
cooperative_turbo.rar - c est un code matlab qui décrit une comminication turbo cooperative ,2013-05-06 20:38:32,下载4次