Cdma transmission employing clipping function

H - Electricity – 04 – J

Patent

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Details

H04J 13/00 (2006.01) G06F 9/46 (2006.01) H04B 1/707 (2006.01) H04B 7/005 (2006.01) H04J 3/06 (2006.01) H04J 11/00 (2006.01) H04J 13/02 (2006.01) H04L 9/32 (2006.01) H04L 12/24 (2006.01) H04L 12/26 (2006.01) H04L 12/28 (2006.01) H04L 12/403 (2006.01) H04L 12/56 (2006.01) H04L 12/66 (2006.01) H04L 29/06 (2006.01) H04Q 7/32 (2006.01) H04Q 7/38 (2006.01) H04Q 11/04 (2006.01) H04Q 7/20 (2006.01) H04Q 7/34 (2006.01)

Patent

CA 2222734

A CDMA signal processing circuit (300) includes a summer circuit (302) that receives a plurality of CDMA signals from a plurality of channels (304). The summer circuit (302) combines the plurality of CDMA signals according to a power magnitude value and power direction value associated with each CDMA signal. The summer circuit (302) generates a summed signal (306) that is applied to a clipping circuit (308). The clipping circuit (308) removes a portion of the summed signal (306) outside a desired threshold range and generates a clipped signal (310) therefrom. Digital to analog processing circuits (312 and 314) convert the clipped signal (310) into a half width encoded format. Digital to analog processing circuits (312 and 314) transform the half width encoded clipped signal into analog I and Q signals, respectively. The analog I and Q signals are applied to corresponding filters (316 and 318) prior to transmission.

Circuit de traitement de signal AMRC (300). Comprend un circuit sommateur (302) qui reçoit un certain nombre de signaux AMRC provenant d'un certain nombre de canaux (304). Le circuit sommateur (302) combine lesdits signaux AMRC en fonction d'une valeur de grandeur de puissance et d'une valeur d'orientation de puissance associées à chaque signal AMRC. Le circuit sommateur (302) produit un signal additionné (306) qui est appliqué à un circuit d'écrêtage (308). Le circuit d'écrêtage (308) supprime une partie du signal additionné (306) à l'extérieur d'une plage de seuil désirée et produit ainsi un signal écrêté (310). Des circuits de traitement numérique-analogique (312 et 314) convertissent le signal écrêté (310) en un format codé demi-largeur. Les circuits de traitement numérique-analogique (312 et 314) transforment le signal écrêté codé demi-largeur en des signaux I et Q analogiques. Les signaux I et Q analogiques sont appliqués à des filtres correspondants (316 et 318) avant la transmission.

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