CDMA communication with a propagation delay between a base and a

Details CDMA communication with a propagation delay between a base and a CDMA communication with a propagation delay between a base and a

1995-03-15

1997-04-01

Safourek, Benedict V.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

370350, 370508, 379 59, 455 331, 455 511, 455 541, H04J 1304

Patent

active

056174101

ABSTRACT:
In a CDMA communication network, each base station (BS) is made to establish synchronism between a downward transmission signal directed to a mobile station (MS) and an upward reception signal received from the mobile station by adjusting in the mobile station a mobile generated SS pattern into an adjusted SS pattern of producing an upward transmission signal for reception at the base station as the upward reception signal. In order to get the adjusted SS pattern, the base station inserts in the downward transmission signal an inserted signal representative of a propagation delay t(D) between the base and the mobile stations and a propagation delay increment t(d) while the mobile station is in a prelminary state of receiving the downward transmission signal as a downward reception signal first from the base station and is in a steady state, respectively. The signals may ba propagated through at least one communication satellite. Preferably, each mobile station comprises a delay circuit (53) for synchronizing the adjusted SS pattern with an adjusted time, which is equal to t(B)-t(D) and to t(B)-t(d) in the preliminary and the steady states, where t(B) represents a base station absolute time at which a base generated SS pattern is generated for downward transmission signals directed to mobile stations covered by the base station.

REFERENCES:
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5111478 (1992-05-01), McDonald
patent: 5235615 (1993-08-01), Omura
Patent Abstracts of Japan, vol. 16, No. 462 (E-1269), Sep. 25, 1992 & JP-A-04 162840, Jun. 8, 1992.

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