Multipath resistant, orthogonal code-division multiple access sy

Details Multipath resistant, orthogonal code-division multiple access sy Multipath resistant, orthogonal code-division multiple access sy

1994-07-14

1999-11-16

Nguyen, Chau

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, 375200, H04J 1304

Patent

active

059870141

ABSTRACT:
The present invention is directed to the use of bandwidth efficient OCDMA in a multipath environment. The high rate PN code greatly attenuates multipath components that are delayed enough to have significant impact on the degree of orthogonality that may be achieved. By offsetting the carriers by the RW chipping rate and using precise network timing to align all accesses to a small fraction of a high rate PN chip duration, it is possible to fully utilize the available bandwidth. The procedure for achieving this time base alignment has been previously disclosed in U.S. patent application Ser. No. 980,957.

REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5222100 (1993-06-01), Lundquist et al.
patent: 5235614 (1993-08-01), Bruckert et al.
patent: 5299229 (1994-03-01), Zscheile et al.
patent: 5383219 (1995-01-01), Wheatley et al.
Dixon, R. Spread Spectrum Systems With Commercial Applications, p. 282, '94 .

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