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ANALYSIS AND DESIGN OF H-INFINITY CHANNEL ESTIMATION IN MULTICELL MULTIUSER DISCRETE WAVELET BASED MIMO-OFDM SYSTEMS
A.Vamsidhar, P.Rajesh Kumar, K.Raja Rajeswari

Published in: International Journal of Current Engineering And Scientific Research ( IJCESR)
Volume- 4, Issue-9, pp.31-37, Sep 2017
DPI :-> 16.10046.IJCESR.2017.V4I9.3137.1915



Abstract
This paper investigates the uplink transmission in multicell multiuser a couple of-enter multiple-output (MIMO) orthogonal frequency-depart multiplexing (OFDM) systems. The system version considers imperfect channel estimation, pilot contamination (PC), and multicarrier and multipath channels. Analytical expressions are first offered on the Minimum square errors (MSE) of classical channel estimation algorithms [i.e., least squares (LS) and minimum mean square error (MMSE)] inside the presence of PC. Then, a discrete Wavelet Transformation (DWT) channel estimation method is proposed to have excellent suppression to PC. This technique exploits the space-alternating generalized expectation– maximization (SAGE) iterative method to decompose the multicell multiuser MIMO (MU-MIMO) hassle into a sequence of singlemobile single-consumer single-input singleoutput (SISO) issues, which reduces the complexity notably. According to the analytic results given herein, growing the quantity of pilot subcarriers cannot mitigate PC, and a clue for suppressing PC is acquired. It is proven from the results that the DWT has higher suppression functionality to PC than classical estimation algorithms. Its overall performance is close to that of the optimal MMSE as the duration of channel impulse reaction (CIR) is expanded. By using the SAGE manner, the overall performance of the DWT does no longer degrade while the number of antennas is massive at the bottom station (BS).

Key-Words / Index Term
PC, MIMO, OFDM, LS, MMSE, DWT, SAGE

How to cite this article
A.Vamsidhar, P.Rajesh Kumar, K.Raja Rajeswari , “ANALYSIS AND DESIGN OF H-INFINITY CHANNEL ESTIMATION IN MULTICELL MULTIUSER DISCRETE WAVELET BASED MIMO-OFDM SYSTEMS”, International Journal of Current Engineering And Scientific Research ( IJCESR), 4, Issue-9, pp.31-37, Sep 2017. DPI:16.10046.IJCESR.V4.I9.1915