2 dB Better Than CP-OFDM with OFDM/OQAM for Preamble-Based Channel Estimation

• Published in: 2008 IEEE International Conference on Communications pp. 1302 - 1306
• Main Authors: Lele, C., Siohan, P., Legouable, R.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-05-2008
• Subjects: Channel estimation; Communications Society; Delay; Fading; Interference; OFDM modulation; Pulse shaping methods; Quadrature amplitude modulation; Research and development; Shape
• ISSN: 1550-3607; 1938-1883
• DOI: 10.1109/ICC.2008.253

OFDM/OQAM is a special type of multi-carrier modulation that can be considered as an alternative to conventional OFDM with cyclic prefix (CP) for transmission over multi-path fading channels. Indeed, as it requires no CP, it has the advantage of a theoretically higher spectral efficiency. Furthermore, efficient pulse shaping can also be easily implemented with OFDM/OQAM. However, the classical channel estimation methods used for OFDM cannot be directly applied to OFDM/OQAM. In this paper we present an analysis of this problem and we introduce a new preamble-based channel estimation method. The performance results are obtained either by considering an IEEE802.22 channel model or regarding to the channel delay spread variation of a two-tap channel. The proposed OFDM/OQAM channel estimation method is evaluated, in both scenarios, using different pulse shaping and taking conventional CP-OFDM as reference.