Title :
Hybrid Domain Compensation for Analog Impairments in OFDM Systems
Author :
Lin, Hai ; Zhu, Xu ; Yamashita, Katsumi
Author_Institution :
Dept. of Electr. & Inf. Syst., Osaka Prefecture Univ., Sakai
Abstract :
In orthogonal frequency division multiplexing (OFDM) systems with direct-conversion transceivers, transmission performance is severely degraded by analog impairments, typically, carrier frequency offset, transmitter/receiver I/Q imbalance, and DC offset. The existing research considered only part of these impairments. In this paper, we analyze the OFDM signal corrupted by all these impairments. Then, a hybrid domain compensation scheme consisting of the time-domain and frequency-domain compensation is proposed. For the purpose of practical implementation, we also propose a comparable preamble, with which the compensation coefficients can be obtained by a low- complexity acquisition algorithm.
Keywords :
OFDM modulation; frequency-domain analysis; transceivers; DC offset; I/Q imbalance; analog impairments; carrier frequency offset; direct-conversion transceivers; frequency-domain compensation; hybrid domain compensation scheme; low-complexity acquisition algorithm; orthogonal frequency division multiplexing systems; time-domain compensation; Bandwidth; Degradation; Discrete cosine transforms; Frequency estimation; Maximum likelihood estimation; OFDM; Signal analysis; Time domain analysis; Transceivers; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Conference_Location :
New Orleans, LO
Print_ISBN :
978-1-4244-2324-8
DOI :
10.1109/GLOCOM.2008.ECP.615
