Method and system for generating and decoding a bandwidth efficient multi-level signal
AssigneeQuellan, Inc.
InventorsMichael G. Vrazel, Stephen E. Ralph
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AssigneeQuellan, Inc.
InventorsMichael G. Vrazel, Stephen E. Ralph
Estimating the term…
The present invention combines standard binary ASK modulation with differential PSK (DPSK) modulation to achieve a two times or doubled increase in data throughput and a spectral efficiency of 1 bit/s/Hz. In other words, the present invention can be characterized as overlaying DPSK onto a regular binary ASK transmission. Each bit generated by the inventive modulation technique can have one of two intensities and one of two phases such that every symbol transmitted can comprise two bits. The present invention encodes (and subsequently decodes) information into both the phase and amplitude of a carrier signal. This translates into less complex circuitry and lower costs for a receiver in the inventive system. This also means that phase integrity does not need to be maintained throughout the communications system like that of a coherent QAM communications system because the relative phase instead of the absolute phase is tracked.
A method for high speed communications comprising:
A transmitter for generating multilevel signals comprising:
A receiver for decoding multilevel signals comprising:
A transmitter for generating multilevel signals comprising:
A receiver for decoding multilevel signals comprising:
Dependencies are inferred from the claim text.