Broadcast transmission system with single correction filter for correcting linear and non-linear distortion
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United States of America Patent
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Dec 31, 2002
Grant Date -
N/A
app pub date -
May 14, 1999
filing date -
May 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a digital broadcast transmission system (60), a power amplifier (66) amplifies an information signal to a power level suitable to excite an antenna to emit a broadcast signal. Prior to, an subsequent to, the amplification processing circuitry (68, 70) processes the signal. In particular, the information signal is bandpass filtered. The power amplifier (66) causes non-linear distortion to the information signal. The processing circuitry (68, 70) causes linear distortions to the information signal. A single, memoryful filter (76) pre-distorts the information signal to compensate for all of the linear and non-linear distortions. Preferably, the memoryful filter (76) is a volterra filter. In another embodiment, a memoryful filter (112) pre-distorts an information signal to compensate for linear distortion from a power amplifier (102) and non-linear distortion from pre-amplification processing circuitry (104). Linear distortion from post-amplification processing circuitry is compensated by a linear equalizer (114). For each embodiment, the number of compensation steps is reduced compared to a sequence in which separate compensation occurs.
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