Modem to be coupled to a directional transmission line of an SS

Details Modem to be coupled to a directional transmission line of an SS Modem to be coupled to a directional transmission line of an SS

1981-05-15

1983-07-05

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

370 19, H03K 1301, H04J 1100, H04J 1300

Patent

active

043922201

ABSTRACT:
In an SS (spread spectrum) modem, a high-pass filter (81) for rejecting a low frequency component including an information signal received by demodulation, produces an SS signal component modified by a PN (pseudo noise) code sequence used for the demodulation. A multiplier (82) substantially regenerates the SS signal component. Band division may be resorted to, in which case an input filter (161) selects a partial band SS signal for the demodulation. A transit filter (164) rejects the partial band SS signal. An SS signal is sent to a destination modem through one of output filters (162) selected for the destination modem. Each generator (67, 71) may generate a PN code sequence given by a product of PN codes, one having a frame period equal to an integral multiple (unity allowed) of the PN clock period of another. Each partial band may be about 1/5 of the entire frequency band of the PN code sequence. A center portion of the band may be used in transmitting a narrow-band synchronizing signal. In a band division network, the highest partial band may be used for an SS (multiplex) signal and other partial bands, collectively for a baseband TDM signal.

REFERENCES:
patent: 4281409 (1981-07-01), Schneider
patent: 4293953 (1981-10-01), Gutleber
patent: 4301530 (1981-11-01), Gutleber

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