203 Hits in 7.8 sec

A Combined Selective Mapping And Closed-Loop Quasi-Orthogonal Space Time Block Coding Scheme For Peak-To-Average Power Ratio Mitigation In Mimo-Ofdm Transmission

Faisal Alharbi
2008 Zenodo  
Figure 3 shows evaluation results in terms of the CCDF of implementing the new scheme when applied to closed loop QO-STBC with an oversampling factor of unity, L = 1.  ...  In Section 3, the combination of the PAPR mitigation approach in closed loop QO-STBC for MIMO-OFDM transmission with the SLM method is presented. Simulation results are provided in Section 4.  ... 
doi:10.5281/zenodo.40872 fatcat:qfynsflzibf63ietlyxrgtpbba

Improved QO-STBC OFDM System Using Null Interference Elimination

K. O., R. A., Y. A., S. M., T. S., J. Rodrigues, K. N.
2013 International Journal of Advanced Computer Science and Applications  
A method of eliminating this interference in QO-STBC is investigated by nulling the interfering terms towards full diversity for an OFDM system.  ...  The quasi-orthogonal space time block coding (QO-STBC) over orthogonal frequency division multiplexing (OFDM) is investigated.  ...  An interference elimination technique was used in the case of a QO-STBC OFDM system to improve the performance of the QO-STBC scheme over an OFDM system.  ... 
doi:10.14569/ijacsa.2013.040834 fatcat:br6pfvjkdrfqvmvs7vd7pynq3i

Peak-to-average power ratio mitigation in quasi-orthogonal space time block coded MIMO-OFDM systems using selective mapping

F. S. Alharbi, J. A. Chambers
2008 2008 Loughborough Antennas and Propagation Conference  
Peak-to-average power ratio mitigation in quasi-orthogonal space time block coded MIMO-OFDM systems using selective mapping.  ...  Peak-to-average power ratio mitigation in quasi-orthogonal space time block coded MIMO-OFDM systems using selective mapping. Citation: ALHARBI, F.S. and CHAMBERS, J.A., 2008.  ...  CONCLUSION In this paper, a combined SLM approach was proposed for PAPR mitigation in MIMO-OFDM transmission over four transmit antenna systems which exploits closed loop operation with a full rate and  ... 
doi:10.1109/lapc.2008.4516890 fatcat:4t43iqs4v5dqlo6uvhsgnywoii

A simple asynchronous distributed STBC network scheme with full diversity

Wei Song, Qiang Liu, Moon Ho Lee
2012 EURASIP Journal on Advances in Signal Processing  
In this article, we propose a simple distributed space-time block code (STBC) network scheme for asynchronous relay network, where every two traditional relay nodes are combined to one node to amplify  ...  The orthogonal frequency division multiplexing (OFDM) symbols are broadcast from source to relay nodes in the first step, and in the second step, the received signals at the relay nodes are implemented  ...  Q-STBC is implemented.  ... 
doi:10.1186/1687-6180-2012-147 fatcat:bt4fmx654farje4sxyugpaw3qu

Quasi-Orthogonal Time-Reversal Space–Time Block Coding for Frequency-Selective Fading Channels

Hakam Mheidat, Murat Uysal, Naofal Al-Dhahir
2007 IEEE Transactions on Signal Processing  
Since QO-STBCs have been originally proposed for frequency-flat fading channels, it is a challenging design problem to apply them over frequency-selective channels.  ...  Quasi-orthogonal space-time block codes (QO-STBCs) are a powerful code family designed for more than two transmit antennas.  ...  We have demonstrated through the derivation of PEP expressions that our schemes are able to achieve a maximum diversity order of 2(L + 1) for conventional QO-STBC and 4(L + 1) for rotated QO-STBC over  ... 
doi:10.1109/tsp.2006.885766 fatcat:qsc3tibgfvgatdhcxlq5ffp7im

A road to future broadband wireless access: MIMO-OFDM-Based air interface

Hongwei Yang
2005 IEEE Communications Magazine  
We focus on various research topics for the MIMO-OFDM-based air interface, including spatial channel modeling, MIMO-OFDM transceiver design, MIMO-OFDM channel estimation, space-time techniques for MIMO-OFDM  ...  Orthogonal frequency-division multiplexing is a popular method for high-data-rate wireless transmission.  ...  If a system is designed to achieve better QoS for average data rate, STBC/SFBC is a better choice.  ... 
doi:10.1109/mcom.2005.1381875 fatcat:4ejszgcndfafdl7b45hpn6z63u


Woud M. Abed, Raghad K. Mohammed
2019 Zenodo  
This paper simulates and investigates the performance of four widely-used channel estimation techniques for MIMO-OFDM wireless communication systems; namely, super imposed pilot (SIP), comb-type, spacetime  ...  The performance is evaluated through a number of MATLab simulations, where the bit-error rate (BER) and the mean square error (MSE) are estimated and compared for different levels of signal-to-noise ratio  ...  Daoud et. al [23] developed a new algorithm to enhance the performance of the speaker verification over the communication systems based MIMO-OFDM techniques.  ... 
doi:10.5281/zenodo.3540398 fatcat:4ycl5fhrf5aoxhlmhful2jfsfe

Full-rate and full-diversity extended orthogonal space-time block coding in cooperative relay networks with imperfect synchronization

F. T. Alotaibi, J. A. Chambers
2010 2010 IEEE International Conference on Acoustics, Speech and Signal Processing  
QO-STBC.  ...  Although the original implementation of [8] was designed for a single-carrier implementation, this can be extended to our scheme by applying the algorithm in [8] for each OFDM sub-carrier independently  ... 
doi:10.1109/icassp.2010.5496167 dblp:conf/icassp/AlotaibiC10 fatcat:7tvhdtmxfbckfbwkr2pfqg76ai

Single-carrier frequency domain equalization

F. Pancaldi, G. Vitetta, R. Kalbasi, N. Al-Dhahir, M. Uysal, H. Mheidat
2008 IEEE Signal Processing Magazine  
O rthogonal frequency division multiplexing (OFDM) has been recently adopted by major manufacturers and by standardization bodies for a wide range of wireless and wireline applications ranging from digital  ...  The major virtues of OFDM are 1) its resilience to multipath propagation providing a viable low-complexity and optimal (in the maximum likelihood sense) solution for intersymbol interference (ISI) mitigation  ...  A comparative performance study of FDE-QO-STBC with TD equalization and OFDM can also be found in [26] .  ... 
doi:10.1109/msp.2008.926657 fatcat:ttxo64yqqretnhfecgmbww7jxm

Full-Diversity QO-STBC Technique for Large-Antenna MIMO Systems

Kelvin Anoh, Godfrey Okorafor, Bamidele Adebisi, Ali Alabdullah, Steve Jones, Raed Abd-Alhameed
2017 Electronics  
The proposed interference-free QO-STBC is also implemented for 16 × N R and 32 × N R MIMO systems, where N R ≤ 2.  ...  The standard QO-STBC is combined with the modal matrices of the Hadamard matrices motivated by EVD to construct new QO-STBC with no ISI and achieves full diversity.  ...  It can be verified that D 4 is the detection matrix that implements a QO-STBC systems with N T = 4 and N R = 1.  ... 
doi:10.3390/electronics6020037 fatcat:adapdly3bjeorg7oseevnkfsj4

MIMO-OFDM with Enhanced Channel Estimation based on DFT Interpolation

Mahdi AbdulHadi, Omar Almukhtar Tawfeeq
2014 International Journal of Computer Applications  
In this paper channel estimation for STBC-MIMO-OFDM system has been investigated by implementing the most popular channel estimators least Square (LS) and Minimum Mean Error Square (MMSE) both based on  ...  LS and MMSE estimator have been implemented with and without DFT-based estimation technique to estimate the channel effect for STBC-MIMO-OFDM system and compare their performance by measuring the bit error  ...  Pilot insertion can be performed in two approaches, either by inserting pilot tones into all subcarriers of the OFDM symbols with a specific period or inserting pilot tones into each OFDM symbol at periodically-located  ... 
doi:10.5120/18797-0247 fatcat:wokszov32jhbvggotg6t4kpuhq

Multiple Input Multiple Output [chapter]

2015 Wireless Communications Systems Design  
To my family Massimo, Luana and Alberto, their call for tenacity echoes in my ears.  ...  Acknowledgements This work is the result of the research conducted in two years at the University of Florence and during a visiting period of one year at Center for TeleInFrastruktur (CTIF) at the University  ...  Enrico Del Re for supporting me during this three year period. I owe my deepest gratitude to Prof.  ... 
doi:10.1002/9781118759479.ch8 fatcat:zerctkcbnjhxdnv6vsemyyki74

A Reduced-PAR Opportunistic STBC Scheme for Frequency-Selective Channels in the Presence of Frequency Offset

Dandan Wang, Hlaing Minn, N. Al-Dhahir
2008 IEEE Transactions on Wireless Communications  
We show that our scheme achieves a 2dB reduction in PAR over the conventional scheme.  ...  In this paper, we present a novel scheme for integrating them with orthogonal frequency division multiplexing (OFDM) for frequency-selective channels with an unequal error protection capability making  ...  Motivated by this observation, we propose our new opportunistic STBC-OFDM scheme (illustrated in Fig. 1) , where the basic idea is to implement hybrid DEC/S-DEC at the OFDM symbol level.  ... 
doi:10.1109/twc.2008.070200 fatcat:nzp57uh6knhjdpzf55s3ruwwje

Linear diversity-embedding STBC: design issues and applications

K. Z. Islam, P. Rabiei, N. Al-Dhahir, S. Diggavi, A. Calderbank
2009 IEEE Transactions on Communications  
We design a novel class of space-time codes, called linear diversity-embedding space-time block codes (LDE-STBC) where a high-rate STBC is linearly superimposed on a high-diversity STBC without requiring  ...  Furthermore, we investigate the application of LDE-STBC to wireless multicasting and demonstrate its performance advantage over conventional equal-error-protection STBC.  ...  Wang for several interesting discussions and contributions on the subject of this paper.  ... 
doi:10.1109/tcomm.2009.06.080008 fatcat:gfv5owx6lvadpiiqwk3fmwhpt4

A Simple Quasi-Orthogonal Space-Time Scheme For Use In Asynchronous Virtual Antenna Array Enabled Cooperative Networks

J.A. Chambers, Matthew Hayes, Malcolm D. Macleod
2008 Zenodo  
Although the original implementation of [4] was designed for a single-stage single-carrier implementation, this can be extended to our scheme by applying Toker's algorithm for each OFDM sub-carrier independently  ...  In recent years many schemes have utilized the simple encoding and maximum-likelihood (ML) decoding of STBCs in a distributed framework to implement cooperative diversity, for systems where it may not  ... 
doi:10.5281/zenodo.41119 fatcat:7licykraorayvfuisfckalxlvu
« Previous Showing results 1 — 15 out of 203 results