| Publisher | Massachusetts Institute of Technology | ||
|---|---|---|---|
| Format | 1.4MB PDF | Date added | 19 Jul 2006 |
| Topics | Wireless LAN, Software Engineering, Mobile - Wireless Communications | ||
| Downloads | 55 | ||
An adaptive algorithm is proposed for OFDM signal detection on Doppler-distorted, time-varying multipath channels. The focus of the approach is on low complexity post-FFT signal processing. The receiver performs MMSE combining of signals received across an array, using adaptive channel estimation. Nonuniform Doppler compensation across subbands is performed using a single adaptively estimated parameter representing the Doppler rate. Algorithm performance is demonstrated on experimental data, transmitted through a shallow water channel over the distance of 2.5 km. QPSK modulation with a varying number of carriers is used in a 24 kHz acoustic bandwidth. Excellent performance is achieved with up to 1024 carriers, yielding an overall bit rate of 30 kbps.
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