Title :
Joint estimation of synchronization impairments in MIMO-OFDM system
Author :
Jose, Renu ; Hari, K.V.S.
Author_Institution :
Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India
Abstract :
A joint Maximum Likelihood (ML) estimation algorithm for the synchronization impairments such as Carrier Frequency Offset (CFO), Sampling Frequency Offset (SFO) and Symbol Timing Error (STE) in single user MIMO-OFDM system is investigated in this work. A received signal model that takes into account the nonlinear effects of CFO, SFO, STE and Channel Impulse Response (CIR) is formulated. Based on the signal model, a joint ML estimation algorithm is proposed. Cramer-Rao Lower Bound (CRLB) for the continuous parameters CFO and SFO is derived for the cases of with and without channel response effects and is used to compare the effect of coupling between different estimated parameters. The performance of the estimation method is studied through numerical simulations.
Keywords :
MIMO communication; OFDM modulation; maximum likelihood estimation; synchronisation; CFO; CIR; CRLB; Cramer-Rao Lower Bound; SFO; STE; carrier frequency offset; channel impulse response; channel response effects; joint ML estimation algorithm; joint maximum likelihood estimation algorithm; multiple-input multiple-output system; nonlinear effects; numerical simulations; orthogonal frequency division multiplexing; sampling frequency offset; single-user MIMO-OFDM system; symbol timing error; synchronization impairments; Channel estimation; Maximum likelihood estimation; OFDM; Receiving antennas; Synchronization; Carrier Frequency Offset; Channel Impulse Response; Cramer-Rao Lower Bound; MIMO-OFDM; Sampling Frequency Offset; Symbol Timing Error; Synchronization;
Conference_Titel :
Communications (NCC), 2012 National Conference on
Conference_Location :
Kharagpur
Print_ISBN :
978-1-4673-0815-1
DOI :
10.1109/NCC.2012.6176835
