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Full-rate is very important inany data transmission coding.
For transmitting data at low bit rate thanfull-rate code, higher modulation scheme is required.
But it is impossible todesign full rate orthogonal designs with complex constellation for more thantwo transmit antennas.
Only Alamouti code provides full-rate for two transmitantennas.
In this paper, Bit Error Rate BER is calculated forQuasi-Orthogonal Space-time Block Coding QOSTBC.
Here we work with Rayleighfading channel.
We consider the codes which decodes pairs of symbols instead ofsimple separate decoding like Orthogonal Space-Time Block Coding.
InQuasi-Orthogonal Space-time Block Code full-rate is achieved but full-diversityis sacrificed.
Diversity is the most important techniques for providingreliable communication over fading channels.
One of the diversity techniquesthat uses multiple transmit and-or receive antennas is space diversity.Multiple antenna technique provides a space diversity to struggle with thefading without necessarily sacrificing bandwidth resources, so the excellentsolutions of removing the fading of the channel for broadband wirelesscommunications is using space diversity.
Then, with the constellation rotationof the symbol, rotated version of Quasi-Orthogonal Space-Time Block Code isgenerated.
It provides full diversity.
We simulate BER for QOSTBC, rotatedQOSTBC, orthogonal STBC and for uncoded system.
The simulation result showsthat QOSTBC and rotated QOSTBC perform better than other systems.
It shows thatQOSTBC provides a full transmission rate but that rotated QOSTBC provides the fullrate with the full diversity.

KEYWORDS

Orthogonal Space-Time Block Coding, Quasi-Orthogonal Space-Time Block Coding, Rayleigh Fading, Rotated Quasi-Orthogonal Space-Time Block Coding

Cite this paper

Ranju, M.
and Rafi, R.
2014 Analysis of Rate One Quasi-Orthogonal Space-Time Block Coding over Rayleigh Fading Channel.
International Journal of Communications, Network and System Sciences, 7, 196-202.
doi: 10.4236-ijcns.2014.76021.






Autor: Md.
Abdullah Al Amin Ranju, Ragib Shakil Rafi


Fuente: http://www.scirp.org/





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