System for controlling and shaping the spectrum and redundancy o

Details System for controlling and shaping the spectrum and redundancy o System for controlling and shaping the spectrum and redundancy o

1998-03-25

1999-10-19

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

Antinoise or distortion

H04L 2506

Patent

active

059701005

ABSTRACT:
Methods and apparatus are disclosed for shaping and controlling the spectrum of transmitted samples with a set of predetermined frequency characteristics and a predetermined set of allowable transmitted signal levels are disclosed. In particular, methods of minimizing the energy of the signal at unwanted frequencies are described. For each of the transmitted samples, the system computes a running measure of unwanted components. It then computes, for each block (or "data frame") of the transmitted samples, an objective function, for example, a running filter sum based upon a biquad filter function. It then selects, for each block or spectral shaping frame of transmitted samples, a sign combination from a sign-combination subset such that the objective function is optimized.

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"A Spectral Shaping Technique for PCM Modems", Vedat Eyuboglu, Telecommunications Industry Association (TIA), Nov. 13-15, 1996.

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