Abstract
We propose a novel Iterative Decision-Directed Differential Detection (iD4) technique for Orthogonal Frequency Division Multiplexing (OFDM) systems employing Differential Phase Shift Keying (DPSK) modulation in each subcarrier, such as the Eureka 147 Digital Audio/Multimedia Broadcasting (DAB/DMB) system. The iD4 technique improves the differential detection performance in fast fading channels by estimating and compensating the time-domain Channel Phase Variation (CPV). Computer simulations show that significant performance improvement is achieved by using iD4 over Conventional Differential Detection (CDD), and the maximum Doppler spread, at which the OFDM receiver can achieve satisfactory reception, is greatly extended. Taking the DAB/DMB system operating in mode IV at L-band as an example, iD4 increases the maximum receiver vehicle speed from 95 kilometers per hour (km/h) to 190 km/h, in a Typical Urban (TU) channel environment.
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