CDMA communication method and group spreading modulator

Details CDMA communication method and group spreading modulator CDMA communication method and group spreading modulator

1997-06-18

2000-07-04

Patel, Ajit

Multiplex communications

Channel assignment techniques

Combining or distributing information via code word channels...

370203, 370209, 370342, 375200, H04B 7216

Patent

active

060848847

ABSTRACT:
A CDMA communication method capable of providing a multi-rate user with high quality transmission using a spreading sequence selected from sequences which consist of multilayer sequences arranged in a hierarchical tree structure. A higher level sequence C.sub.16 (1) and its inverted sequence C.sub.16 (1) are included in its lower level sequences {C.sub.32 (1), C.sub.32 (2)} and {C.sub.64 (1), C.sub.64 (2), C.sub.64 (3), C.sub.64 (4)}, for example, and a sequence from a higher level is selected to transmit a higher rate data: The C.sub.16 (1) is used to transmit data whose peak rate is twice the peak rate of the data transmitted using its lower level sequences {C.sub.32 (1), C.sub.32 (2)}, and four times (=2.sup.2) that of the data transmitted using the sequences {C.sub.64 (1), C.sub.64 (2), C.sub.64 (3), C.sub.64 (4)}. The C.sub.16 (l), however, cannot be selected if any one of its lower level sequences {C.sub.32 (1), C.sub.32 (2)} and {C.sub.64 (1), C.sub.64 (2), C.sub.64 (3), C.sub.64 (4)} are already being used. This makes it possible for all the spreading sequences of simultaneous multi-rate users to be orthogonal at any transmission rate.

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