Multiplex communications – Wide area network – Packet switching
Patent
1994-07-19
1996-06-25
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375200, 375205, H04J 1300
Patent
active
055306977
ABSTRACT:
A PN code demodulator reduced in hardware scale and a code-division multiplex communication apparatus using the PN code demodulator are provided wherein the quantity of external noise is detected during communications and the number of multiplexed channels can be immediately changed in accordance with the quantity of external noise. In the PN code demodulator, an exclusive-OR unit derives an exclusive-OR of a PN code and a baseband signal modulated by the PN code. A counting unit counts the number of anticoincidence bits at which the baseband signal does not coincide with the PN code, based on the output of the exclusive-OR unit over a predetermined code length. A determining unit and a restoring unit restore a data signal in accordance with whether the number of anticoincidence bits counted by the counting unit has reached the value of the (predetermined code length+1)/2. A correlation value output unit obtains a correlation value based on the count value of the counting unit. In the code-division multiplex communication apparatus, the number of multiplexed channels is controlled in accordance with the correlation value.
REFERENCES:
patent: 4930140 (1990-05-01), Cripps et al.
patent: 5128959 (1992-07-01), Bruckert
patent: 5319634 (1994-06-01), Bartholomew et al.
patent: 5390167 (1995-02-01), Inatsu et al.
Commonly assigned U.S. pending patent application Ser. No.: 08/152,047, Filed Nov. 12, 1993.
Fujitsu Limited
Hom Shick
Olms Douglas W.
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