MULTIPATH RESISTANT, ORTHOGONAL CODE-DIVISION MULTIPLE ACCESS SYSTEM

摘要

The present invention is directed to the use of bandwidth efficient OCDMA in a multipath environment (10, 11-2 and 11-1). 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 Serial No. 980,957.