Patent ID: 6606296
Filing Date: 2003-08-12
Classification: H04L

Abstract:
A data transmission method used in a radio system comprising at least one base station (1) and a subscriber terminal (2-4) which modulate a signal to be transmitted on subcarriers of an orthogonal multicarrier modulation and transmit a reference signal (6-8) in a band in use by using reference carriers formed by the multicarrier modulation, characterized in thatthe reference carriers are substantially randomly placed in the band in use; the reference carriers have a reference number; and the reference carriers are placed in the band in use by using a linear congruential generation formula based on iteration: fn=(afnâˆ’1+b)mod N, where a and b are constants, N is a maximum amount of carriers in the band in use, fn is a determining reference number of a desired reference carrier and fnâˆ’1 is a determining reference number of the desired reference carrier formed during previous iteration and as an initial value the reference number fnâˆ’1 has a freely selected value.