Patent ID: 7120439

Claim:
A radio, comprising: a receiver for receiving a radio signal; and a velocity estimation block coupled to the receiver for estimating the velocity of the radio, the velocity estimation block including: an autocorrelation block coupled to the receiver for determining the autocorrelation of the received signal using a predetermined lag; a power block coupled to the receiver for determining the power of the received signal; and a Bessel lookup table coupled to the autocorrelation and power blocks for estimating the velocity of the radio; wherein the velocity estimation block estimates the velocity of the radio using the equation v = λ ⁢ InverseJ 0 ⁡ ( E ⁡ [ r ⁡ ( t ) ⁢ r ⁡ ( t - τ ) ] E ⁡ [ r ⁡ ( t ) 2 ] ) 2 ⁢ πτ , where, E[r(t)r(t−τ)] Autocorrelation of the received signal, τ Lag associated with the correlation, E[r(t) 2 ] Signal power, J 0 Bessel function of order 0 , v Velocity of the radio communication device, λ Wavelength of the signal; and Inverse J 0 0 values found in the inverse Bessel function table.