3,591 Hits in 6.2 sec

Two Quasi Orthogonal Space-Time Block Codes with Better Performance and Low Complexity Decoder [article]

Ali Lotfi-Rezaabad, Siamak Talebi, Ata Chizari
2016 arXiv   pre-print
This paper presents two new space time block codes (STBCs) with quasi orthogonal structure for an open loop multi-input single-output (MISO) systems.  ...  These two codes have been designed to transmit from three or four antennas at the transmitter and be given to one antenna at the receiver.  ...  Although orthogonal space-time block codes (OSTBCs) decoder is much simpler than quasi-orthogonal space-time block codes (QOSTBCs) one, the rate of QOSTBCs is higher than that of OSTBCs for more than two  ... 
arXiv:1605.05901v1 fatcat:olxmy7vgbrgmpbmq3cqdpv7qi4


Younes Djemamar, Saida Ibnyaich, Abdelouhab Zeroual
2020 Jordanian Journal of Computers and Information Technology  
This paper proposes a new full-rate space-time block code for MIMO systems at four transmit antennas, which aims at minimizing the bit error rate with low-complexity decoding using ZF and MMSE linear detection  ...  to be quasi-static and not frequency selective, compared with those of the orthogonal STBC of Tarokh of 1/2 rate and the full-rate quasi-orthogonal STBC of Jafarkhani.  ...  The matrices of full-rate quasi-orthogonal space-time block codes Jaf C Both full-rate quasi-orthogonal codes of Jafarkhani and Tirkkonen have the same BER performance at low and high SNR in Rayleigh  ... 
doi:10.5455/jjcit.71-1580753625 doaj:768fc38477564a0fb96947283954dce8 fatcat:nkymw4qo7bakpgo2nuq5yn7fqa

Analysis of Different Space Time Block Codes with Linear Receiver for Various Modulation Technique

Khushbu Sethi, Kiran Kiran
2013 International Journal of Computer Applications  
Here a new space time block code is proposed and compared with other codes. General Terms Wireless communication, space time coding.  ...  Space-time coding is designed with two-dimensional signal matrices to be transmitted over a period of time from a number of antennas.  ...  Orthogonal space time block codes (OSTBCs) achieve full transmit diversity with a low (linear) decoding complexity.  ... 
doi:10.5120/12180-7760 fatcat:ayvmqnn6r5fhxa3fnv2wjsy7eu

A quasi-orthogonal space-time block code

H. Jafarkhani
2001 IEEE Transactions on Communications  
It has been shown that a complex orthogonal design that provides full diversity and full transmission rate for a space-time block code is not possible for more than two antennas.  ...  Previous attempts have been concentrated in generalizing orthogonal designs which provide space-time block codes with full diversity and a high transmission rate.  ...  QUASI-ORTHOGONAL SPACE-TIME BLOCK CODE An example of a full-rate full-diversity complex space-time block code is Alamouti scheme [2] , which is defined by the following transmission matrix: (4) Here we  ... 
doi:10.1109/26.898239 fatcat:pvue3eancfg3jgw7y6uiz43xfa

Enhancement of Twice Quasi Orthogonal Space Time Block Coded (QOSTBC) Performance System with Zero Forcing EVCM Decoder

Desy Agustin, Nachwan Mufti Adriansyah, Muhsin, W. Martiningsih, R. Wiryadinata, S. Praptodiyono, M.I. Santoso, I. Saraswati
2018 MATEC Web of Conferences  
Although some earlier MIMO standards were develop some space-time codes like (O-STBC)and (Q-OSTBC) to provide high reliability but they are limited able to achieve orthogonality.  ...  One attractive approach to improve that performance is using technique transmit diversity which is spacetime block coding and receiver diversity i.e. zero forcing EVCM (ZF EVCM).  ...  A few studies were already proposed and developed on methods QOSTBC some of research are "Two Quasi Orthogonal Space-Time Block Codes with Better Performance and Low Complexity Decoder" [9] .  ... 
doi:10.1051/matecconf/201821803009 fatcat:2psg4wjtzfcd7hhz3sqryuyaqi

Efficient Space-Time Block Codes Derived from Quasi-Orthogonal Structures

Mohammad Janani, Aria Nosratinia
2007 IEEE Transactions on Wireless Communications  
We propose a new class of block codes that outperforms known space-time block codes at low rates.  ...  The new codes are designed by using appropriate rotations and set partitioning on two quasi-orthogonal codes, and combining subsets of their codewords.  ...  Quasi-orthogonal space-time codes (QOSTC) [1] were designed with an eye towards low-SNR performance while having simple decoding complexity. However, QOSTC could not achieve full diversity.  ... 
doi:10.1109/twc.2007.360365 fatcat:kobrxztqhvguhdcvzf4hjbkiyi

Analysis of Rate One Quasi-Orthogonal Space-Time Block Coding over Rayleigh Fading Channel

Md. Abdullah Al Amin Ranju, Ragib Shakil Rafi
2014 International Journal of Communications, Network and System Sciences  
We consider the codes which decodes pairs of symbols instead of simple separate decoding like Orthogonal Space-Time Block Coding.  ...  In this paper, Bit Error Rate (BER) is calculated for Quasi-Orthogonal Space-time Block Coding (QOSTBC). Here we work with Rayleigh fading channel.  ...  This is called Rotated Quasi-Orthogonal Space Time Block Codes (Rotated QOSTBCs).  ... 
doi:10.4236/ijcns.2014.76021 fatcat:zmygwqbptvcrfmfkkth67dbtba

Performance of Space Time Block Codes and Quasi Orthogonal Space Time Codes on Fading Channel

Sajjad Ahmed Ghauri, Bilal Arshad, Agha Saif, I. M. Qureshi
2013 International Journal for Infonomics  
In this paper the performance of Space Time Codes (STC) & Quasi Orthogonal Space Time Block Codes (QOSTBC) has been analyzed.  ...  Space time codes works with the price of redundancy bits and extra antenna price. Simulation results for QOSTBC also shows better performance with the price of slightly increased decoding complexity.  ...  And its variant QOSTBC is a type of non-orthogonal space time block codes and gives better performance when the system is composed of more than two antennas.  ... 
doi:10.20533/iji.1742.4712.2013.0093 fatcat:vgufa7zenjccjjf7kewczauinu

Super-Orthogonal Co-Ordinate Interleaved Orthogonal Designs

D. Smith
2008 2008 IEEE International Conference on Communications  
A super-orthogonal co-ordinate interleaved orthogonal design (CIOD) space-time block code is introduced for three and four transmit antennas.  ...  Good performance is shown in comparison to other codes of comparable decoding complexity.  ...  decoding complexity quasi-orthogonal space-time block codes (MDC-QOSTBC) [8] .  ... 
doi:10.1109/icc.2008.746 dblp:conf/icc/Smith08 fatcat:eakvzxelefa75fazvk4ys55jim

Space Time Coding Techniques in MIMO: A Review

Shakti Raj Chopra, Navjot Kaur, Himanshu Monga
2016 Indian Journal of Science and Technology  
Spatial diversity techniques by the means of multiple transmitting and receiving antennas and the performance of MIMO systems has been discussed for different space-time coding structures such as Alamouti  ...  Space-time coding techniques rely on the construction of matrices and the signal is to be transmitted at different period of time from multiple of antennas.  ...  Jafarkhani 9 compared the quasi-orthogonal space-time block code (QO-STBC with an orthogonal space-time block code such as Alamouti code. Quasi orthogonal codes areprovide full transmission rate.  ... 
doi:10.17485/ijst/2015/v8i1/106425 fatcat:fmyh2fvd3jeybh4dpv65uucbzu

Unit-rate and Low-complexity Space-time Block Coding for Multiple Antennas

Xiangbin Yu, Dong Tao, Dazhuan Xu
2006 2006 7th International Symposium on Antennas, Propagation & EM Theory  
Space-time block coding (STBC) has been an effective transmit diversity technique for combating fading due to its orthogonal design, simple decoding and high diversity gains.  ...  In this paper, a unit-rate and low-complexity STBC scheme for multiple antennas is proposed, and turbo coding is employed as channel coding to improve the proposed code scheme performance further.  ...  block coding scheme with complex orthogonal design for 3 transmit antennas, and compare its performance with other full-diversity space-time block codes, such as the G2, G3 and H3 code.  ... 
doi:10.1109/isape.2006.353445 fatcat:4u5lecuwg5g5jniwias4anuhni

A Full Rate Quasi-orthogonal STF-OFDM with DAC-ZF Decoder over Wireless Fading Channels

Jiyu Jin, Kwan-Woong Ryu, Yongwan Park
2006 ETRI Journal  
ABSTRACT⎯ In this letter, we propose a quasi-orthogonal space-time-frequency (QOSTF) block coded orthogonal frequency division multiplexing (OFDM) that can achieve full symbol rate with four transmit antennas  ...  Due to modulation advantage and collected diversity advantage, the proposed scheme exhibits a better bit-error rate performance than other orthogonal schemes.  ...  Introduction Space-time block coded orthogonal frequency division multiplexing (ST-OFDM) suffers performance degradation in environments with high Doppler frequency [1] .  ... 
doi:10.4218/etrij.06.0205.0086 fatcat:rfnk5cieffdktoxben6dkv7cmu

Quasi-Orthogonal Space-Frequency Block Codes for MIMO OFDM Channels

Fatemeh Fazel, Hamid Jafarkhani
2006 2006 IEEE International Conference on Communications  
In this paper, we propose a novel class of Space-Frequency and Space-Time-Frequency block codes based on Quasi-Orthogonal designs, over a frequency selective Rayleigh fading channel.  ...  Additionally, the proposed Space-Time-Frequency code benefits from a reduced maximum likelihood decoding complexity, which is a huge simplification compared to the existing codes.  ...  A rotated Quasi-Orthogonal Space-Time Block Code (QOSTBC) provides both full diversity and full rate and performs better in low and high SNR, compared to OSTBC.  ... 
doi:10.1109/icc.2006.255517 dblp:conf/icc/FazelJ06 fatcat:r4gvgfv5p5alficfa67xipdd6q

Space-time block codes from cyclic design

Liang Xian, Huaping Liu
2005 IEEE Communications Letters  
It has been proved that full-rate complex orthogonal space-time block codes do not exist for systems with more than two transmit antennas.  ...  Index Terms-Space-time block codes, spatial diversity, wireless communications.  ...  However, the encoding and decoding complexities of this code are higher than those of quasi-orthogonal codes. In this letter, we present a new space-time block coding scheme based on cyclic design.  ... 
doi:10.1109/lcomm.2005.1411016 fatcat:2a6jkmu3ynantd2jd7y4iizaoy

On OSTBC Codes for LTE-A Systems-Design and Performance Evaluation

Asem Alhammadi, Adnan A. Zain
2015 Journal of Science and Technology  
Based on the theory of real and complex orthogonal designs, this paper deals with the design of real and complex OSTBC codes to be used with real signal set constellation such PAM and complex signal constellation  ...  Real and complex OSTBC codes for MIMO systems with two, three, four, five, six, seven and eight transmit antennas and any number of receive antennas, are presented.  ...  codes [11] , space-time block codes from orthogonal designs [16] , and unitary space-time codes [18, 19] .  ... 
doi:10.20428/jst.20.2.5 fatcat:yiinzeagqja6rldr3qxtmvxu34
« Previous Showing results 1 — 15 out of 3,591 results