Robust erasure detection and erasure-rate-based closed loop...

Details Robust erasure detection and erasure-rate-based closed loop... Robust erasure detection and erasure-rate-based closed loop...

H - Electricity

04

L

H04L 1/00 (2006.01) H04B 7/005 (2006.01) H04L 1/20 (2006.01)

Patent

CA 2570343

Techniques for performing erasure detection and power control for a transmission without error detection coding are described. For erasure detection, a transmitter transmits codewords via a wireless channel. A receiver computes a metric for each received codeword, compares the computed metric against an erasure threshold, and declares the received codeword to be "erased" or "non-erased". The receiver dynamically adjusts the erasure threshold based on received known codewords to achieve a target level of performance. For power control, an inner loop adjusts the transmit power to maintain a received signal quality (SNR) at a target SNR. An outer loop adjusts the target SNR based on the status of received codewords (erased or non-erased) to achieve a target erasure rate. A third loop adjusts the erasure threshold based on the status of received known codewords ("good", "bad", or erased) to achieve a target conditional error rate.

L'invention concerne des techniques de détection d'effacement et de commande de puissance pour transmission sans codage de détection d'erreur. S'agissant de la détection d'erreur, un émetteur transmet des mots de code via un canal sans fil. Un récepteur calcule une métrique pour chaque mot de code reçu, compare la valeur de métrique avec un seuil d'effacement et déclare le mot de code reçu <= effacé >= ou <= non effacé >=. Le récepteur règle de façon dynamique le seuil en question sur la base des mots de code connus reçus pour assurer un niveau cible de performance. S'agissant de la commande de puissance, une boucle interne règle la puissance d'émission pour maintenir une qualité de signal reçu à une valeur cible de rapport signal-bruit (SNR). Une boucle externe règle le SNR cible sur la base de l'état des mots de code reçus (effacé ou non effacé) pour assurer un taux d'effacement cible. Une troisième boucle règle le seuil en question sur la base de l'état des mots de code connus reçus (<= bon >=, <= mauvais >=, ou effacé) pour assurer un taux d'erreur conditionnel cible.

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