H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 13/04 (2006.01) H03K 7/04 (2006.01) H04B 1/707 (2006.01) H04B 14/02 (2006.01) H04J 13/00 (2006.01) H04L 25/49 (2006.01) H04L 25/493 (2006.01)
Patent
CA 2153423
A BPSK-MPP-DS-CDMA system is devised based on an M-ary pulse position mod- ulated spreading-sequence signal. Under same bandwidth, same amount of energy used for one decision, and same bit error rate comparison conditions, if the number of users is less than the number Nu of available sequence signals in the spreading sequence signal set {Sp(t)} used in the BPSK-MPP-DS-CDMA system, the multiple access capacities of the BPSK-MPP-DS-CDMA system according to the present invention for M = 4, M = 8,and M = 16 are improved by factors of at least 1.335, 1.66, and 1.65 over conventional BPSK-DS-CDMA systems. On the other hand, if the number of users reaches Nu, the multiple access capacity can not be increased futher, however, the bit error rate of the system still be reduced. Furthermore, significant amount of transmission energy is saved.
Chang Chen-Yi
R. William Wray & Associates
LandOfFree
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