OFDM with Cyclic-Pilot Time Diversity

Abstract— We present a novel transceiver design for orthogonal frequency-division multiplexing (OFDM) wireless systems employing pilot symbol aided channel estimation (PSACE). The design is based on the insertion of known pilots into the timefrequency OFDM grid in a controlled cyclic fashion to exploit time diversity in the pilot tones without consuming additional bandwidth resource. Semi-blind iterative detection based on the expectation-maximization algorithm along with optimum combining is employed at the receiver. Despite moderately increased transceiver complexity, simulations show that the proposed design has superior error rate performance compared to conventional PSACE methods for the same pilot overhead.

• Type: Conference
• Year: 2007
• Where: VTC
• Authors: Ali Yazdanpanah, Behrang Nosrat-Makouei, Rodney G. Vaughan
• Keywords: Orthogonal Frequency-division Multiplexing, Systems Employing Pilot, Timefrequency Ofdm Grid, VTC 2007