Redundancy scheme for Fourier transform coding on peak limited channels
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United States of America Patent
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Dec 7, 1993
Grant Date -
N/A
app pub date -
Jan 21, 1992
filing date -
Jan 21, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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