Differential encoding is known to simplify receiver complexity because it by-passes channel estimation. However, over rapidly fading wireless channels, extra transceiver modules are necessary to enable differential transmission. Relying on a basis expansion model for time and frequency selective (doubly-selective) channels, we derive such a generalized block differential (BD) codec that achieves the maximum Doppler and multi-path diversity gains, while affording low-complexity maximum likelihood (ML) decoding. We further show that existing BD systems over frequency-selective or time-selective channels follow as special cases of our novel system. Simulations corroborate our theoretical analysis.
|Original language||English (US)|
|Number of pages||5|
|Journal||IEEE International Conference on Communications|
|State||Published - Sep 12 2005|
|Event||2005 IEEE International Conference on Communications, ICC 2005 - Seoul, Korea, Republic of|
Duration: May 16 2005 → May 20 2005