8-PSK transmit filtering using reduced look up tables

Details 8-PSK transmit filtering using reduced look up tables 8-PSK transmit filtering using reduced look up tables

2006-05-16

2006-05-16

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S278000, C375S284000, C375S285000, C375S135000, C375S146000, C332S103000, C332S107000

Reexamination Certificate

active

07046738

ABSTRACT:
A method for generating a premodulation-filtered modulation waveform having a real part and an imaginary part for transmitting octal symbols uses a reduced lookup table. Successive octal symbols, each comprising three information bits, are input to a logic unit. The logic unit forms a first derived bit by combining the first and third information bits and a second derived bit by combining the second and third information bits. The first and second information bits, along with the first and second derived bits, are delayed in respective L-bit shift registers. The bit sequences in the L-bit shift registers are used to determine a corresponding filtered waveform segment for each bit sequence. The waveform segments corresponding to the delayed first information bits and the delayed first derived bits are combined to obtain a segment of said imaginary waveform part. The waveform segments corresponding to the delayed second information bits and delayed second derived bits are combined to obtain a segment of said real waveform part.

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Allan, R.D.; Bramwell, J.R.; Saunders, D.A.; Tomlinson, M.; “A high performance satellite data modem using real-time digital signal processing techniques,” Journal of the Institution of Electronic and Radio Engineers, vol. 58, No. 3, pp. 117-124.

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