Signal quality measure in packet data communication

Details Signal quality measure in packet data communication Signal quality measure in packet data communication

1990-12-19

1992-04-07

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

380 34, H04L 900

Patent

active

051034611

ABSTRACT:
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central compuer which maintains a database management system. Data packets are sent from the remote units by an RF link to intermediate base stations, then sent by the base stations to the central computer by a serial link. Direct sequence spread spectrum modulation is used for the RF link. The remote hand-held units initiate an exchange using RF transmission to and from the base stations, receiving only during a rigid time window following a transmission from the remote unit. The base stations cannot initiate communication to the remote units, but instead send data to the remote units only as part of the exchange.

REFERENCES:
patent: 4933953 (1990-06-01), Yagi
patent: 4995053 (1991-02-01), Simpson et al.
patent: 5008899 (1991-04-01), Yamamoto

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