Blind equalization of multilevel turbo coded-continuous phase frequency shift keying over MIMO channels
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Date
2007
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info:eu-repo/semantics/closedAccess
Abstract
In this paper, multilevel turbo coded-continuous phase frequency shift keying (MLTC-CPFSK) is introduced and its bit error performance in multiple input multiple output (MIMO) fading channels are investigated considering a blind maximum likelihood channel estimation. Multilevel turbo coded signals with continuous phase modulation (CPM) provides low spectral occupancy and is suitable for power and bandwidth-limited channels. Besides, antenna diversity is one of the best method to combat with multipath fading effects. The performance of 2LTC for 4-ary CPFSK over AWGN, Rician (for Rician channel parameter K = 10 dB) and Rayleigh channels are given for 1Tx-1Rx, 2Tx-1Rx and 2Tx-2Rx antenna configurations. Channel capacities of 2LTC-4CPFSK signals are obtained as -5.26, -7.65 and -7.14 dB for 1Tx-1Rx, 2Tx-1Rx and 2Tx-2Rx antenna configurations, respectively. Baum-Welch (BW) algorithm is used to estimate the channel parameters. Bit error probabilities of 2 level turbo coded 4 CPFSK (2LTC-4CPFSK) are drawn in the cases of no channel state information (CSI), BW estimation, and perfect CSI. Approximately 0.1 and 0.75 dB gains in Es/N 0 are obtained using BW channel estimator for Rician and Rayleigh channels, respectively. Therefore, MLTC-CPFSK with BW channel estimator has excellent performance in MIMO fading channels. Copyright © 2006 John Wiley & Sons, Ltd.
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Keywords
Channel capacity, Continuous phase modulation, MIMO channels, Multilevel coding, Turbo codingblind channel estimation
Journal or Series
International Journal of Communication Systems
WoS Q Value
Q3
Scopus Q Value
Q2
Volume
20
Issue
1
