NASA NTRS · 20090032071
Parallel-Processing CMOS Circuitry for M-QAM and 8PSK TCM
Abstract
There has been some additional development of parts reported in "Multi-Modulator for Bandwidth-Efficient Communication" (NPO-40807), NASA Tech Briefs, Vol. 32, No. 6 (June 2009), page 34. The focus was on 1) The generation of M-order quadrature amplitude modulation (M-QAM) and octonary-phase-shift-keying, trellis-coded modulation (8PSK TCM), 2) The use of square-root raised-cosine pulse-shaping filters, 3) A parallel-processing architecture that enables low-speed [complementary metal oxide/semiconductor (CMOS)] circuitry to perform the coding, modulation, and pulse-shaping computations at a high rate; and 4) Implementation of the architecture in a CMOS field-programmable gate array.
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Gray, Andrew, Lee, Dennis, Hoy, Scott, Fisher, Dave, Fong, Wai, Ghuman, Parminder. 2009-09-01. Parallel-Processing CMOS Circuitry for M-QAM and 8PSK TCM. https://ntrs.nasa.gov/citations/20090032071
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