Alternative direct sequence spread spectrum symbol to chip...

Details Alternative direct sequence spread spectrum symbol to chip... Alternative direct sequence spread spectrum symbol to chip...

2011-03-08

2011-03-08

Payne, David C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S140000

Reexamination Certificate

active

07903720

ABSTRACT:
Alternative direct sequence spread spectrum symbol to chip mappings and methods for generating the same for use in a direct sequence spread spectrum wireless protocol and embedded in a transceiver chip used by wireless subsystems are provided. The present invention discloses alternative symbol to chip mappings that are orthogonal or nearly orthogonal to the N/2 unused chip sequences defined by a standard transmission protocol. The present invention is advantageous because it provides for an increased number of users and better reliability for wireless subsystems operating in increasingly overcrowded frequency bands. Other advantages of the present invention include a reduction in the negative effects of clear channel assessment including delayed or cancelled signal transmission and interference for wireless subsystems that transmit time-sensitive data.

REFERENCES:
patent: 6590889 (2003-07-01), Preuss et al.
patent: 6606349 (2003-08-01), Kudhrethaya et al.
patent: 6744807 (2004-06-01), Linde et al.
patent: RE40231 (2008-04-01), Snell et al.
patent: 2003/0112849 (2003-06-01), Gorday et al.
patent: 2005/0195732 (2005-09-01), Huh et al.
patent: 2005/0281318 (2005-12-01), Neugebauer
patent: 2009/0110033 (2009-04-01), Shattil
patent: 2009/0290660 (2009-11-01), Neugebauer

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