Patent ID: 6598200
Filing Date: 2003-07-22
Classification: H03M,H04L

Abstract:
A method of operating a frequency domain data transmission system to transmit a data frame from a transmitter to a receiver using a transmission frequency band from which one or more frequency band portions are selected, by adaptive or pre-emptive selection or by allocation, for data transmission such that the frequency band contains one or more unused frequency band portions, comprising the steps of;inserting data bits into a payload portion of the data frame; padding with a predetermined bit sequence a portion of the payload; applying error correction to the data bits and the padding bits and inserting error detection bits into the frame to form a data frame of a predetermined length; mapping the data frame-into the transmission frequency band such that the payload and the error detection bits are mapped to and transmitted in the one or more selected frequency band portions and the padding bits are mapped to the one or more unused frequency band portions and are not transmitted; receiving the data bits and the error detection bits from the one or more selected frequency band portions; reinserting the padding bit sequence to restore the predetermined length frame, subject to any transmission errors; applying error correction using the error detection bits to correct the transmission errors in the data bits, where possible; and extracting the data bits.