초록 ▼

A data transmission system comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, wherein data signals are transmitted as packets including one or more blocks of data encoded with an error correcting cod

A data transmission system comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, wherein data signals are transmitted as packets including one or more blocks of data encoded with an error correcting code, wherein each station is arranged automatically to issue a request for repeat of a packet of data should it receive a packet containing errors which cannot be corrected, and wherein should the error rate in received packets be more than a predetermined amount over a predetermined interval of data transmission, the system is arranged automatically to reduce the rate of data transmission within each packet and/or change the channel frequency.

대표청구항 ▼

In an HF radio communication system for transmitting data comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, the method comprising the steps of: (A) providing each radio station with a plurality of p

In an HF radio communication system for transmitting data comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, the method comprising the steps of: (A) providing each radio station with a plurality of predetermined channel frequencies for transmission which have acceptable levels of noise and interference, and providing each such channel frequency with a predetermined reserve channel frequency to which transmission may be changed; (B) transmitting data from a first of said radio stations on one of said predetermined channel frequencies in the form of a data packet, said packet including one or more blocks of data encoded with an error correcting code; (C) receiving and decoding the transmitted data packets at a second of said radio stations and correcting errors, and automatically transmitting a request to said first station for retransmitting of a data packet should it be received with more than a predetermined number of errors; (D) determining the error rate at said second radio station in received data packets; (E) transmitting a request to said first radio station from said second radio station to reduce the rate of data transmission if the error rate is greater than a predetermined amount over a predetermined time interval of data transmission; and (F) transmitting a request to said first radio station from said second radio station to change the channel frequency to said predetermined reserve channel frequency if said step of transmitting a request to said first radio station to reduce the rate of data trasmission does not reduce the error rate below said predetermined amount.