Demodulating A Signal Encoded According To ASK Modulation And PSK Modulation
AssigneeFujitsu Limited
InventorOlga I. Vassilieva
Life of this patent
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Abstract
A system operable to demodulate a PSK-ASK encoded signal encoded according to ASK modulation and PSK modulation includes one or more inversion modulators. An inversion modulator receives an ASK-decoded signal generated according to a first signal split from the PSK-ASK encoded signal. The inversion modulator includes an inverter and an amplitude modulator. The inverter inverts the ASK-decoded signal to yield an inverted ASK-decoded signal, and the amplitude modulator modulates a second signal split from the PSK-ASK encoded signal according to the inverted ASK-decoded signal prior to PSK demodulation.
Claims22
A system operable to demodulate a signal encoded according to amplitude-shift keying (ASK) modulation and phase-shift keying (PSK) modulation, comprising:
- one or more inversion modulators, an inversion modulator operable to:
- receive an ASK-decoded signal generated according to a first signal split from a PSK-ASK encoded signal, the PSK-ASK encoded signal modulated according to ASK modulation and to PSK modulation;
- the inversion modulator comprising:
- an inverter operable to:
- invert the ASK-decoded signal to yield an inverted ASK-decoded signal;
- and
- an amplitude modulator coupled to the inverter and operable to:
- modulate a second signal split from the PSK-ASK encoded signal according to the inverted ASK-decoded signal prior to PSK demodulation.
A method for demodulating a signal encoded according to amplitude-shift keying (ASK) modulation and phase-shift keying (PSK) modulation, comprising:
- performing the following for each ASK-decoded signal of one or more ASK-decoded signals generated according to a first signal split from a PSK-ASK encoded signal, the PSK-ASK encoded signal modulated according to ASK modulation and to PSK modulation:
- receiving an ASK-decoded signal;
- inverting the ASK-decoded signal to yield an inverted ASK-decoded signal;
- and
- modulating a second signal split from the PSK-ASK encoded signal according to the inverted ASK-decoded signal prior to PSK demodulation.
A system for demodulating a signal encoded according to amplitude-shift keying (ASK) modulation and phase-shift keying (PSK) modulation, comprising:
- means for performing the following for each ASK-decoded signal of one or more ASK-decoded signals generated according to a first signal split from a PSK-ASK encoded signal, the PSK-ASK encoded signal modulated according to ASK modulation and to PSK modulation:
- receiving an ASK-decoded signal;
- inverting the ASK-decoded signal to yield an inverted ASK-decoded signal;
- and
- modulating a second signal split from the PSK-ASK encoded signal according to the inverted ASK-decoded signal prior to PSK demodulation.
A system operable to demodulate a signal encoded according to amplitude-shift keying (ASK) modulation and phase-shift keying (PSK) modulation, comprising:
- a splitter operable to:
- split a PSK-ASK encoded signal to yield a first signal and a second signal, the PSK-ASK encoded signal modulated according to ASK modulation and to PSK modulation, the PSK-ASK encoded signal encoded according to return-to-zero (RZ) modulation;
- an ASK demodulator coupled to the splitter and operable to:
- demodulate the first signal split from the PSK-ASK encoded signal to yield a combined ASK-decoded signal;
- a discriminator coupled to the ASK demodulator and operable to:
- separate the combined ASK-decoded signal to yield one or more ASK-decoded signals;
- one or more inversion modulators coupled to the discriminator, wherein:
- the one or more inversion modulators comprise two inversion modulators;
- and
- the PSK-ASK encoded signal is encoded according to 2-level ASK modulation;
- an inversion modulator operable to:
- receive an ASK-decoded signal of the one or more ASK-decoded signals, the inversion modulator having substantially the same extinction ratio an modulator operable to encode the PSK-ASK encoded signal;
- the inversion modulator comprising:
- an inverter operable to:
- invert the ASK-decoded signal to yield an inverted ASK-decoded signal;
- a delay coupled to the inverter and operable to:
- synchronize the inverted ASK-decoded signal with a second signal split from PSK-ASK encoded signal;
- and
- an amplitude modulator coupled to the delay and operable to:
- modulate the second signal according to the inverted ASK-decoded signal prior to PSK demodulation;
- and
- a PSK demodulator coupled to the one or more inversion modulators and operable to:
- demodulate the second signal split from the PSK-ASK encoded signal to yield a PSK-decoded signal.
Dependencies are inferred from the claim text.