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Simple Cooperative Relaying Strategies for WiMAX Communication System
2009
2009 IEEE Wireless Communications and Networking Conference
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The cooperative schemes proposed combine the Amplify and Forward (AAF) and the Decode and Forward (DAF) algorithm with Delay Diversity (DD) and Cyclic Delay Diversity (CDD) techniques, in order to exploit ...
Cooperative Relaying Systems represent a promising solution for future wireless communications. ...
Cooperative Cyclic Delay Diversity scheme Adapting the CDD schemes to the cooperative relaying systems is more complicated than DD ones: in fact, in the CDD techniques, the delay, which is distinctive ...
doi:10.1109/wcnc.2009.4917966
dblp:conf/wcnc/MorosiMFRJ09
fatcat:lqgx4w6bdbdlxhfktnqnibzfzi
On the Error Rate and Delay Performance Analysis of OFDM based Cooperative Protocol for 802.11 Networks
2013
INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY
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Transmit diversity is provided by the relays in close proximity to source node. ...
Space frequency block codes (SFBC) are spread over OFDM subcarriers instead of OFDM symbols to compensate for the small coherence time. ...
In this paper, we design a space-frequency cooperative system, based on, PHY layer OFDM, distributed SFBC, and MAC layer RTS/CTS/ACK (Request-to-send/Clear-to-send/Acknowledgement) protocol and evaluate ...
doi:10.24297/ijct.v10i2.7001
fatcat:v2uvz3xrxzaejhgem3ztalx2ia
An Adaptive MIMO-OFDMA Relay System
2012
IEEE Wireless Communications Letters
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We consider multi-input multi-output (MIMO) antennas relay systems under time-varying channels and propose a joint relay, antenna, subband, and MIMO transmission mode adaptation scheme which enables antenna ...
Moreover, we propose temporal power and bit loading for the cascaded source-relay-destination link with/without inter-hop power allocation to further enhance the system performance. ...
For each link associated with relay R k , one can choose a mode between TAS and SFBC, which returns a smaller conditional BER based on CSI of the middle OFDM symbol within one frame. ...
doi:10.1109/wcl.2012.071612.120357
fatcat:kqli4o3ytzeehmjkxnhqyghjgi
Implementation of BER Performance in SFBC/STBC Based On QAM-OFDM Detection Techniques in OFDM Systems
English
2015
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering
English
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CONCLUSION The results show M-ary QAM OFDM-based system with Best Relay Selection the best-relays selection cooperative has BER better than the regular cooperative diversity. ...
Cooperative wireless communication relay networks in OFDM-based systems have been shown to improve performance in various systems using digital modulation techniques as a form of spatial diversity, this ...
Multiple-relay cooperative diversity in M-ary QAM OFDM-based systems with Best Relay Selection has better performance than the regular cooperative system. ...
doi:10.15662/ijareeie.2015.0402023
fatcat:o34l25mqdjhzlhvvuyqq66cd4m
ICI-ISI Mitigation in Cooperative SFBC-OFDM with Carrier Frequency Offset
2007
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications
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For OFDM based systems, loss of performance due to imperfect carrier synchronization is severe, since it results in inter-carrier interference (ICI). ...
The proposed algorithm could be applied to any orthogonal or quasi-orthogonal designs in cooperative SFBC OFDM schemes. ...
In this paper, we are concerned with combating the ISI and ICI effects in SFBC-OFDM based cooperative schemes. ...
doi:10.1109/pimrc.2007.4394652
dblp:conf/pimrc/SreedharC07
fatcat:7brtbggzbvcbnmsqonxsozcs2u
Wireless Cooperative Networks
2008
EURASIP Journal on Advances in Signal Processing
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The problem of choosing the best relay node in relaying networks is addressed in "Performance of multiple-relay cooperative diversity systems with best-relay selection over rayleigh fading channels" by ...
They consider an amplify-and-forward (AF) cooperative diversity system where a source node communicates with a ...
In "Delay optimization in cooperative relaying with cyclic delay diversity," S. B. ...
doi:10.1155/2008/810149
fatcat:c6vwhztbpjaglnjnz2fsdpgvam
Performance comparison of distributed IDM-STC versus cooperative OFDM for practical decode-and-forward relay-networks
2012
2012 International ITG Workshop on Smart Antennas (WSA)
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In this paper, we compare two different multiplexing strategies for a two-hop parallel relay channel. ...
show the performance of distributed Interleave-Division-Multiplexing Space-Time Coding (dIDM-STC) and cooperative Orthogonal Frequency Division Multiplexing (cOFDM) operating in a decode-and-forward relay ...
Cyclic Delay Diversity (dCDD), the relays forward a cyclically shifted signal of the processed and re-encoded source signal. ...
doi:10.1109/wsa.2012.6181197
dblp:conf/wsa/VorkoperLKWD12
fatcat:55ppkaut4vdrxf7ut6q3oh3cmq
Adaptive resource allocation within three-stage OFDM relay networks
2008
2008 42nd Asilomar Conference on Signals, Systems and Computers
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In this work we consider OFDM transmission, due to its potential for meeting the stringent quality of service (QoS) targets of nextgeneration broadband distributed wireless networks, over three-stage relay ...
on the channel state information (CSI) and knowledge of the network topology. ...
SYSTEM MODEL In this section, the basic system model for cooperative relaying based OFDM system is introduced. ...
doi:10.1109/acssc.2008.5074825
fatcat:lnox3yom4ja6bpnkckkajxceui
Data-precoded algorithm for multiple-relay-assisted systems
2012
EURASIP Journal on Advances in Signal Processing
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We present the analytical derivation of the gain obtained with the data-precoded algorithm in comparison with distributed spacefrequency block code (SFBC) ones. ...
A data-precoded relay-assisted (RA) scheme is proposed for a system cooperating with multiple relay nodes (RNs), each equipped with either a single-antenna or a two-antenna array. ...
The flow of signals is described in Figure 2 , for the case of single-antenna RNs and an OFDM-based system. The received symbols are represented in blue, while the transmitted ones are in white. ...
doi:10.1186/1687-6180-2012-22
fatcat:vgaa3p5rzbdtjcpzq7743bz54q
An iterative pilot-data-aided estimator for SFBC relay-assisted OFDM-based systems
2012
EURASIP Journal on Advances in Signal Processing
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In this article, we propose and assess an iterative pilot-data-aided channel estimation scheme for space frequency block coding relay-assisted OFDM-based systems. ...
The relay node (RN) employs the equalise-and-forward protocol, and both the base station (BS) and the RN are equipped with antenna arrays, whereas the user terminal (UT) is a single-antenna device. ...
Conclusion We proposed a pilot-data-based estimation algorithm for an OFDM-based cooperative scenario where spatial diversity provided by SFBC is complemented with the use of a half-duplex RN using the ...
doi:10.1186/1687-6180-2012-74
fatcat:m5wyjxgvv5gyldofilu245gtqy
Design Philosophy of MIMO OFDM system for Underwater Communication
수중 통신 환경을 위한 MIMO-OFDM 시스템 설계
2011
The Journal of the Korean Institute of Information and Communication Engineering
수중 통신 환경을 위한 MIMO-OFDM 시스템 설계
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As multi-input multi-output (MIMO) processing techniques, Alamouti code is implemented and evaluated to perform for space time block coding (STBC) and space frequency block coding (SFBC) for UWA OFDM systems ...
In this paper, we first analyze the differences of underwater acoustic (UWA) orthogonal frequency division multiplexing (OFDM) systems and conventional terrestrial OFDM system, and give a simple introduction ...
System performance for different transmit
diversity and receive combining schemes with perfect
channel estimation
그림 8은 완벽한 채널 추정을 가정하고 있는 상황
에서 SISO-OFDM 시스템의 경우와 2×1 SFBC/STBC
및 1×2 MRC 기술을 적용한 ...
doi:10.6109/jkiice.2011.15.1.022
fatcat:bvbl4ayfx5bqvbwbp5xr5jw6j4
3G Radio Access Evolution — HSPA and LTE for Mobile Broadband —
2009
IEICE transactions on communications
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The paper also discusses the current stage of the 3GPP activities on evolving LTE towards LTE-Advanced and full IMT-Advanced compliance. ...
LTE transmit diversity is based on so-called Space-Frequency Block Coding (SFBC), complemented with Frequency Switched Transmit Diversity (FSTD) in case of four antenna ports. ...
Compared to Layer-1 relaying (a repeater), Layer-2/3 relaying implies additional delay, as the transmission needs to be decoded and re-encoded within the relay. ...
doi:10.1587/transcom.e92.b.1432
fatcat:tcq3p7s6rzgappelwgdloftzke
Timing and carrier synchronization in wireless communication systems: a survey and classification of research in the last 5 years
2016
EURASIP Journal on Wireless Communications and Networking
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on the system model assumptions for synchronization, the synchronization challenges, and the state-of-the-art synchronization solutions and their limitations. ...
literature review and classification of the recent research progress in achieving timing and carrier synchronization in single-input-single-output (SISO), multiple-input-multiple-output (MIMO), cooperative relaying ...
The well-known multi-carrier system is based upon OFDM. 1 In OFDM systems, at the transmitter side, an IFFT is applied to create an OFDM symbol and a cyclic prefix is appended to the start of an OFDM symbol ...
doi:10.1186/s13638-016-0670-9
fatcat:xqzvzx4trrgdnbw2sde5gjoisa
A Novel Signal Detection Algorithm for Underwater MIMO-OFDM Systems Based on Generalized MMSE
2019
Journal of Sensors
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This paper presents a novel signal detection algorithm based on generalized MMSE. First, we propose a model for the underwater MIMO-OFDM system. ...
As the core, a signal detection algorithm determines the performance and complexity of the MIMO-OFDM system. ...
Oshiro and Wada [16] design an underwater MIMO-OFDM communication system based on the cyclic-free prefix space-time block (CFPSTB) coding. ...
doi:10.1155/2019/2603051
fatcat:bittkwq7dzd2tjcczckja2jpxi
Channels and Parameters Acquisition in Cooperative OFDM Systems
[chapter]
2011
Vehicular Technologies: Increasing Connectivity
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Based on the non-Gaussian dual-hop relay link nature (Zhou et al., 2009) proposed a first-order autoregressive channel model and derived an estimator based on Kalman filter. ...
Scenario description The studied scenario, depicted in Fig. 1 , corresponds to the proposed RA schemes for downlink OFDM-based system. ...
/books/vehicular-technologies-increasingconnectivity/channels-and-parameters-acquisition-in-cooperative-ofdm-systems ...
doi:10.5772/14883
fatcat:ogmvho63sbbkpmoatkmlufclpe
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