EMITTER International Journal of Engineering Technology Vol.1, No.1, December 2013 ISSN : 2443-1168 Copyright © 2013 EMITTER International Journal of Engineering Technology - Published by EEPIS 11 PERFORMANCE OF CHANNEL ESTIMATION TECHNIQUE INMIMO-OFDM SYSTEM USING m-PSKMODULATION Musayyanah, Yoedy Moegiharto, I Gede Puja Astawa Department of Electrical Engineering Politeknik Elektronika Negeri Surabaya Kampus PENS, Jalan Raya ITS Sukolilo, Surabaya 60111 Tel: (031) 594 7280; Fax: (031) 594 6114 E-mail: musay@student.eepis-its.edu, yoedy@eepis-its.edu, puja@eepis-its.edu Abstract Multicarrier modulation technique as Orthogonal Frequency Division Multiplexing (OFDM) is able to vanishIntersymbol Interferences (ISI) caused by multipathchannel. Merging with multi- antenna transmission techniques such asMIMO become MIMO- OFDM system is able to improve (data rate transmission)the transmission of data and capacity of the system. Pilot channel estimation technique with the algorithm Linear Minimum Mean Square Error (LMMSE) with modulation m-PSK is applied in this study. The results obtained in the form of graphs BER against EbNo which shows that the system performance with LMMSEestimator has a different gain for QPSKmodulation better about 0.75 dB, for 8 PSKmodulation is about 1.5 dB and for 16 PSKmodulation around 1 dB compare to LS estimator. Number of the largest antenna both in the transmitter and receiver produce the best system performance. Observation for QPSKmodulation shows a scheme transmitter- receiver antenna 4x2 having gain approximately 9 dB better than the number of the lowest transmitter antenna(1x2). For scheme 4x4 shows gain around 8,5 dB than the number of the lowest receiver antenna. Keywords:MIMO, OFDM,LS, LMMSE, MPSK. 1. INTRODUCTION OFDMis a famous technique of multi-carriermodulationand lot of researches about it have been conducted. The OFDMtechnique divides series of high speed information data become parallel series of low speed information data, so that symbol duration becomes larger than duration of delay spread channel so that it is capable of vanishing the effect of ISI [1].The technology of OFDM has hingher spectral efficiencyand is able to minimize bandwidth by arrange bandwidth of some subcarrier in overlapping orthogonally so itcan not produce Inter Carrier Interference (ICI).Process of transmissioncan be conducted by providing more antenna at both receiver