Title :
Channel Estimation in CP-OQAM-OFDM Systems
Author :
Dejin Kong ; Xiang-Gen Xia ; Tao Jiang ; Xiqi Gao
Author_Institution :
Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
Due to the insertion of cyclic prefix (CP), orthogonal-frequency-division multiplexing (OFDM) systems with offset quadrature amplitude modulation (OQAM) (OQAM-OFDM) and CP, denoted as CP-OQAM-OFDM, systems have more robustness to combat a multi-path fading channel and simpler and better receivers than the conventional OQAM-OFDM systems. In this paper, two channel estimators, i.e., weighted least square (WLS) and pairs of pilots (POP) are presented in CP-OQAM-OFDM systems. To evaluate the proposed WLS and POP estimators, the corresponding Cramér-Rao bounds are given for comparison. In addition, the computational complexities of the proposed estimators are analyzed as well. Simulation results demonstrate that both of the proposed channel estimators can achieve good bit error rate (BER) performance.
Keywords :
OFDM modulation; channel estimation; computational complexity; error statistics; fading channels; least squares approximations; multipath channels; quadrature amplitude modulation; BER performance; CP-OQAM-OFDM systems; Cramér-Rao bounds; POP estimators; WLS estimators; bit error rate performance; channel estimation; channel estimators; computational complexities; cyclic prefix; multipath fading channel; offset quadrature amplitude modulation; orthogonal-frequency-division multiplexing; pairs of pilots estimators; weighted least square; Channel estimation; Delays; Equalizers; OFDM; Quadrature amplitude modulation; Receivers; Wireless communication; Channel estimation; OFDM; OQAM-OFDM; equalization; filterbank multicarrier modulation;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2014.2356441