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ANALYSING THE BER OF VA R IOUS MODULATION SCHEMES

Journal: International Journal of Engineering Sciences & Research Technology (IJESRT) (Vol.4, No. 7)

Publication Date:

Authors : ;

Page : 462-469

Keywords : Diversity; FEC; coding; efficiency;

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Abstract

An i n t e r e s ti n g appr o ac h for im p l e m e n ti ng d i v e rs i t y i s s p a c e ? tim e t r e lli s c od i n g , wh e re s y m bo l s a re e n c od e d a cc o rd i ng t o t h e a n t e n n a s t hro u g h w h i c h t h e y a re s im u lt a n e ous l y t r a ns mitt e d a nd a r e d e c od e d us i ng a m a x im um li k e li hood d ec o d e r. Th i s s c h e m e i s v e r y e ff e c ti v e , a s i t c o m b i n e s t he b e n e fi t s of f o rw a rd e r ror c o rr ec ti on ( F E C ) c od i ng a nd d i v e rs i t y t ra ns mi ss i on t o prov i de c ons i d e rab l e p e rfor m a n c e g a i ns. T h e c ost for t h i s s c h e m e i s a dd it i on a l pro ce ss i n g , wh i c h i n c r ea s e s e x pon e n ti a l l y a s a fun c ti o n of b a ndw i d t h e f f i c i e n c y (b i t s / s / H z ) a nd t he r e qu i r e d d i v e rs i t y ord e r. T h e r e for e , for so m e app li ca ti ons i t m a y not b e pr ac ti c a l or c os t - e f f ec t i v

Last modified: 2015-07-20 22:43:56