A COMPARATIVE STUDY OF PILOT-BASED CHANNEL ESTIMATORS FOR WIRELESS OFDM

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ABSTRACT
THIS REPORT DEALS WITH PILOT
BASED CHANNEL ESTIMATION IN WIRELESSOFDM SYSTEMS. WE
ASSUME THAT THE RECEIVER IS ABLE TO USE ALL TRANSMITTED PILOTS, WHICH IS THE CASE IN BROAD
CASTING AND IN THE DOWNLINK OF A MULTIUSER SYSTEM. FOUR ESTIMATORS (OF WHICH TWO HAVE
BEEN PROPOSED IN THE LITERATURE)  ARE COMPARED, BOTH IN TERMS OF MEAN-SQUARED ERROR
AND BIT-ERROR RATES. IN THE LATTER CASE, WE SIMULATE A MULTIUSER SYSTEM WHICH INCORPORATES
CHANNEL CODING. THE CHANNEL ESTIMATION IS A TWO-DIMENSIONAL PROBLEM (TIME AND
FREQUENCY), AND BOTH SEPARABLE AND NON-SEPARABLE ESTIMATORS ARE INVESTIGATED. WE DESIGN
LOW-RANK APPROXIMATIONS OF THESE ESTIMATORS, AND COMPARE THE PERFORMANCE AT GIVEN
COMPLEXITIES. THE COMPARISON SHOWS THAT THE USE OF SEPARABLE ESTIMATORS INCREASES THE
PERFORMANCE SUBSTANTIALLY COMPARED TO NON-SEPARABLE ESTIMATORS WITH THE SAME
COMPLEXITY. FOR THE SCENARIO INVESTIGATED IN THIS REPORT THE PERFORMANCE IS FURTHER IMPROVED
BY APPLYING LOW-RANK APPROXIMATIONS SEPARABLE ESTIMATORS.

bienvenue

Thanks a lot!

bienvenue

Thanks a lot!

xiaocun

heguohua

下来看看

citta

thank svery much

hearsnow

好文章

coolsonic

谢！！！！！！！！1