1. A method for inverse channel transfer function estimation in a radio receiver, comprising: in the radio receiver, receiving a modulated signal including a received pilot and storing a frequency-domain representation of the modulated signal in a buffer; in a digital processing unit included in the radio receiver, calculating a value representing a power of the received pilot; determining a bit-shift value; left-shifting the value representing the received pilot's power by the bit-shift value; using a CORDIC algorithm to divide a local reference pilot value by the left-shifted value representing the received pilot's power, obtaining a division result; left-shifting the division result by the bit-shift value; and multiplying the left-shifted division result with a conjugate value of the received pilot to obtain an inverse channel transfer function estimate.