Automatic gain control for a time division duplex receiver

Details Automatic gain control for a time division duplex receiver Automatic gain control for a time division duplex receiver

H - Electricity

04

B

H04B 7/216 (2006.01) H03G 3/20 (2006.01) H03M 1/18 (2006.01) H04B 7/005 (2006.01) H04B 7/26 (2006.01) H04L 1/00 (2006.01) H04L 27/18 (2006.01) H04B 17/00 (2006.01)

Patent

CA 2425464

A method and system for automatic gain control (AGC) in a TDD communication system, wherein each time slot of the communication signal contains a preamble in binary phase shift keying (BPSK) format, located at the beginning of the time slot. The channel estimation by the receiver is improved since the preamble allows AGC to quickly estimate the signal strength and adjust the gain accordingly. This permits all data symbols within the data burst, which follows the preamble, to be correctly received, and results in a midamble channel estimate that is much more accurate. It also allows the AGC circuit within the TDD receiver to be greatly simplified.

La présente invention concerne un procédé et un système de commande automatique de gain (CAG) utilisés dans un système de communication DRT dans lequel chaque intervalle de temps du signal de communication contient un préambule se présentant dans un format de modulation par déplacement binaire de phase (MDBF), situé au début de l'intervalle de temps. L'estimation de la voie par le récepteur est améliorée étant donné que le préambule permet à la CAG d'estimer rapidement l'intensité du signal et d'ajuster le gain en conséquence. Ceci permet à tous les symboles de données de la rafale de données, qui suivent le préambule, d'être correctement reçus et assure une estimation de la voie du préambule intermédiaire qui est plus précise. Ceci permet également de simplifier fortement le circuit CAG du récepteur DRT.

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