Variable bitrate radio modem system to enhance data transmission and reduce error rates

A variable bitrate radio modem system, comprising:

• a receiver for receiving data transmitted at a bitrate by a transmitting device;
• an error detection circuit for detecting an error rate of said data received by said receiver;
• a processor for establishing a bitrate control signal based upon said error rate;
• a transmitter for transmitting said bitrate control signal to said transmitting device;
• and
• a data modulator within said transmitting device equipped with a variable bitrate data generator varying said bitrate based on said bitrate control signal.

A variable bitrate radio modem system, comprising:

• a transmitter transmitting first data and a first bitrate control signal at a first bitrate to a remote device;
• a receiver receiving second data and a second bitrate control signal transmitted by said remote device at a second bitrate;
• a data modulator within said transmitter equipped with a variable bitrate data generator varying said first bitrate based on said second bitrate control signal;
• an error detection circuit within said receiver detecting an error rate of said second data received by said receiver;
• and
• a processor connected to said variable bitrate data generator and said error detection circuit establishing said first bitrate control signal based upon said error rate.

A method of enhancing the transmission of data from a first radio modem unit to a second radio modem unit, said method comprising the steps of:

• (a) establishing a communications link between said first radio modem unit and said second radio modem unit;
• (b) transmitting a packet of data and a first bitrate control signal from said first radio modem unit to said second radio modem unit at a bitrate set at a predetermined level based on a second bitrate control signal which indicates said bitrate;
• (c) receiving said packet of data and said first bitrate control signal at said second radio modem unit, recovering said packet of data using said second bitrate control signal which indicates said bitrate, and determining an error rate of said packet of data received by said second radio modem unit;
• (d) increasing said bitrate by a predetermined amount if said error rate is greater than a predetermined upper threshold;
• (e) decreasing said bitrate by a predetermined amount if said error rate is less than a predetermined lower threshold;
• (f) transmitting said second bitrate control signal which indicates said bitrate from said second radio modem unit to said first radio modem unit, and transmitting another packet of data from said first radio modem unit to said second radio modem unit at said bitrate;
• and
• (g) repeating steps c, d, e, and f until all of said data has been transmitted.

A method of enhancing the transmission of data from a first radio modem unit to a second radio modem unit, said method comprising the steps of:

• (a) establishing a communications link between said first radio modem unit and said second radio modem unit;
• (b) transmitting a packet of data and a first bitrate control signal from said first radio modem unit to said second radio modem unit at a bitrate set at a predetermined level based on a second bitrate control signal which indicates said bitrate;
• (c) receiving said packet of data and said first bitrate control signal at said second radio modem unit, recovering said packet of data using said second bitrate control signal which indicates said bitrate, and determining an error rate of said packet of data received by said second radio modem unit;
• (d) increasing said bitrate by a predetermined amount if said error rate is greater than a predetermined upper threshold for longer than a predetermined time interval;
• (e) decreasing said bitrate by a predetermined amount if said error rate is less than a predetermined lower threshold for longer than a predetermined time interval;
• (f) transmitting said second bitrate control signal which indicates said bitrate from said second radio modem unit to said first radio modem unit, and transmitting another packet of data from said first radio modem unit to said second radio modem unit at said bitrate;
• and
• (g) repeating steps c, d, e, and f until all of said data has been transmitted.

A variable bitrate radio modem system, comprising:

• a transmitter which transmits first data and a first bitrate control signal at a first bitrate to a remote device;
• a data modulator within said transmitter equipped with a variable bitrate data generator which varies said first bitrate based on a second bitrate control signal;
• a receiver which (i) receives second data and said second bitrate control signal from said remote device, (ii) determines an error rate based on said second data, and (iii) generates an error rate signal based on said error rate;
• a clock/data recovery circuit within said receiver which recovers said second data using said first bitrate control signal;
• and
• a processor coupled to said transmitter and to said receiver which generates said first bitrate control signal based on said error rate signal.