Direct sequence frequency ambiguity resolving receiver

Details Direct sequence frequency ambiguity resolving receiver Direct sequence frequency ambiguity resolving receiver

H - Electricity

04

B

H04B 1/707 (2011.01) H04L 27/06 (2006.01) H04L 27/14 (2006.01)

Patent

CA 2223504

A parallel frequency acquisition technique is disclosed for increasing receiver sensitivity and increasing process gain while reducing the necessary preamble duration required for spread spectrum acquisition. In addition, techniques are disclosed for reducing the effects of jamming and impulse noise on the performance of the receiver as well as enhanced antenna diversity approaches. Further, techniques are taught which compensate for chip code alignment drift, providing an associated transmitter maintains carrier and chip code coherence. These techniques allow for the use of lower cost frequency setting crystals in both the receiver and transmitter as well as the operation of the system over a wider temperature range.

La technique décrite d'acquisition de fréquences parallèles sert à améliorer la sensibilité de récepteurs et à augmenter le gain de traitement tout en réduisant la durée du préambule requis pour l'acquisition de spectres dispersés. L'invention concerne également des techniques pour réduire les effets de brouillage et de bruits d'impulsions sur les performances du récepteur, ainsi que des approches améliorées d'antennes de diversité. D'autres techniques décrites compensent la dérive de l'alignement du code à puce, à condition qu'un émetteur associé assure la cohérence de porteuse et de code à puce. Ces techniques permettent d'utiliser des cristaux de régulation de fréquence d'un coût réduit tant dans le récepteur que dans l'émetteur et d'exploiter le système sur une plage plus large de températures.

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