Hybrid Equalization for FTDM Coding on Magnetic Disks
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Fourier transform division multiplexing (FTDM) schemes 1,2 transmit data in contiguous blocks. They augment redundant data to these blocks in order to equalize the effects of the channel memory. This redundancy may be a significant fraction of the data. We disclose here how to drastically reduce this redundancy without loss of channel integrity (at the expense of extra computation in the decoder).