Code division multiple access apparatus

Details Code division multiple access apparatus Code division multiple access apparatus

1997-03-20

2000-05-09

Kizou, Hassan

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370208, 370350, 375206, 375207, 375209, H04B 7216, H04B 1500, H04J 306

Patent

active

060613424

ABSTRACT:
A code division multiple access apparatus which is capable of high-speed synchronization, is simple in construction and, moreover, achieves reduced consumption of electric power during standby. When a specific pattern contained in a signal received by a receiving antenna is detected by a SAW matched filter, a correlation peak is output from the filter. A bit synchronization signal generating circuit detects the correlation peak thereof and generates a synchronization signal after a set time has elapsed from the detection of the correlation peak. An orthogonal PN code generator generates a predetermined orthogonal PN code in accordance with the synchronization signal. Further, a carrier generator generates a carrier in response to the output of the SAW matched filter. This generated carrier is modulated by the output of the orthogonal PN code generator. Then, the signal received by the receiving antenna is multiplied together with the modulation output by a multiplier, integrated by an integrator and returned to its original baseband data form.

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"256kbps DS-SS Radio Unit, JU-2100A Using Digital Sliding Correlators", The Institute of Electronics Information And Communications Engineers, Technicle Report of IEICE, pp. 19-24 (with translation).

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