Codebook indexing to achieve high bit densities in a...

Pulse or digital communications – Spread spectrum – Direct sequence

Reexamination Certificate

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C375S130000

Reexamination Certificate

active

07729409

ABSTRACT:
Apparatuses for achieving high bit densities in a direct-sequence CDMA spread spectrum communication system are disclosed. A table of orthogonal pseudo-noise codes is stored. This table is then partitioned into multiple codebook. Then, the codebook is assigned to a user. The pseudo-noise code contained within the codebooks are used to spread information signal. Information signal for a first user is spread by a pseudo-noise code contained within the codebook assigned to the first user. Multiple bits of information signal may be sent at a time by using the location of the pseudo-noise code within the codebook such that the value of the information signal corresponds the location of the pseudo-noise code within the codebook. The information signal is then despread by using the same pseudo-noise code.

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Written Opinion, PCT/US98/27591, Oct. 5, 1998, 4 pgs.
“Coherent Ultrashort Light Pulse Code Division Multiple Access Communication Systems” Salehi et al., IEEE 1990, pp. 478-491.

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