Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1995-04-17
1996-08-20
Mis, David
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332104, 375296, 375298, 375308, H03C 300, H04L 2720
Patent
active
055482538
ABSTRACT:
A spectrally efficient quadrature amplitude modulator comprising means for providing in-phase (I) and quadrature-phase shifted (Q) bit-streams from an input serial bit-stream, means for selectively suppressing the amplitudes of bits in the I and Q bit-streams in response to transition conditions for the I and Q signals, individual bit-shaping functions for the I and Q signals, and means for quadrature modulating a carrier signal with the I and Q signals. The resultant modulated carrier signal exhibits improved bandwidth efficiency and other desirable power spectral properties, including reduced spectral regrowth after amplitude limiting.
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Mis David
Omnipoint Corporation
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