Redundancy scheme for Fourier transform coding on peak limited channels
US5268938A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Jan 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and method for fourier transform coding of data on peak limited channels using a redundancy scheme. The system and method section the data to be transmitted into contiguous blocks having sequence lengths of 2N. Each block is coded in the frequency domain and its Inverse Discrete Fourier Transform (IDFT) for each coded block is computed. The IDFT blocks are then clipped at predetermined peak values .+-. P to thereby derive clipping error values. The magnitude of the clipping error values is then determined. The magnitude squared values of the clipping error is summed for each block. If the sum exceeds a threshold .phi. for a given block, then, the block is transmitted X number of times, where X is a fixed number, each time using less than the prescribed power for the transmission, otherwise, a continuous signal is transmitted whose sampled values at the Nyquist rate are the clipped values of the IDFT for that particular block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.