Adaptive ARQ/FEC for multitone transmission in wireless networks

This paper describes an automatic repeat request and forward error correction (ARQ/FEC) procedure for multitone data transmission. Multitone data transmission is a candidate for broadband wireless applications. The technique makes use of cyclic redundancy checking (CRC) in both time and frequency. When a block of data is found to be in error, the error is located and corrected by iterative partial CRC requests, reducing and possibly eliminating the need for retransmission of the entire block. Cumulative channel measurements via CRCs are used to control the activity in each channel.