Multiplex communications – Wide area network – Packet switching
Patent
1994-06-29
1996-11-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 18, H04J 1304
Patent
active
055725147
ABSTRACT:
Assuming that 4-system communication with signals A, B, C and D is executed for each frame and one period consists of four frames for the signals A, B, C and D, and signals AS, BS, CS and DS, modulated with spread codes representing the systems to which the signals belong are inserted, a terminal which is about to start communication sequentially tunes the reception frequency to frequencies 1, 2 and 3, detects the signals AS, BS, CS and DS, modulated with the common spread codes, from the received signals per frame over more than one period, acquires the signal levels then, determines from the results of those sequential processes how many spread spectrum signals occupy each frame, and selects the optimal frequency channel that has the least radio interference. It is therefore possible to detect the occupying state of a communication channel and prevent communication from being disabled by an interference signal.
REFERENCES:
patent: 5402413 (1995-03-01), Dixon
patent: 5420850 (1995-05-01), Umeda et al.
Dong-In Kim, "Multiple-Capture Performance of a Common Code DS/SSMA Packet Radio System", IEEE Global Telecommunications Conference 1993.
Casio Computer Co. Ltd.
Jung Min
Olms Douglas W.
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