System and method of frequency offset compensation for radio system with fast doppler shift

A method for compensating frequency variation associated with relative motion between a radio base station and a locomotive radio terminal, the method comprising:

• receiving a signal transmitted between the radio base station and the locomotive radio terminal;
• determining an estimated value of frequency offset based on a plurality of previous frequency offsets according to a Doppler shift model, wherein the Doppler shift model is represented by Doppler shift frequency versus a principal distance between the radio base station and the locomotive radio terminal and a location of the locomotive radio terminal for a given locomotive speed;
• and
• compensating the signal according to the estimated value.

A radio communication system comprising:

• a stationary radio terminal associated with a base station and a mobile radio terminal associated with a locomotive, wherein at least one of the stationary radio terminal and the mobile radio terminal is operable to:
• receive a signal associated with a packet, wherein the packet comprises a preamble part and a payload part;
• determine a first estimated value of next coarse frequency offset based on a first plurality of coarse frequency offsets, first-order derivatives of the first plurality of coarse frequency offsets, and second-order derivatives of the first plurality of coarse frequency offsets;
• and
• compensate the signal associated with the packet according to the first estimated value.

A radio communication system comprising:

• a stationary radio terminal associated with a base station and a mobile radio terminal associated with a locomotive, wherein at least one of the stationary radio terminal and the mobile radio terminal is operable to:
• receive a signal transmitted between the stationary radio terminal and the mobile radio terminal;
• determine an estimated value of frequency offset based on a plurality of previous frequency offsets according to a Doppler shift model, wherein the Doppler shift model is represented by Doppler shift frequency versus a principal distance between the stationary radio terminal and the mobile radio terminal and a location of the mobile radio terminal for a given locomotive speed;
• and
• compensate the signal according to the estimated value.