Hierarchical Modulation
OwnerHong Jiang, Paul A. Wilford +1inventors
InventorsHong Jiang, Paul A. Wilford, Stephen A. Wilkus
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Abstract
A method for modulating first and second bit streams in a communications network that supports at least one of a binary phase-shift keying (BPSK), a quadrature phase-shift keying (QPSK) or a quadrature amplitude modulation (QAM) constellation uses hierarchical modulation. A hierarchical modulation parameter that varies within the network is set. The first bit stream is modulated based on a first constellation of the hierarchical modulation and the hierarchical modulation parameter. The second bit stream is modulated based on a second constellation in the first constellation.
Claims20
A method of modulating first and second bit streams in a communications network that supports at least one of a binary phase-shift keying (BPSK), a quadrature phase-shift keying (QPSK) or a quadrature amplitude modulation (QAM) constellation, the method comprising:
- setting a hierarchical modulation parameter, the hierarchical modulation parameter being a value that can vary within the network;
- modulating the first bit stream based on a first constellation and the hierarchical modulation parameter;
- and
- modulating the second bit stream based on a second constellation in the first constellation.
A method of receiving a signal in a communications network that supports at least one of a binary phase-shift keying (BPSK), a quadrature phase-shift keying (QPSK) or a quadrature amplitude modulation (QAM) constellation, the method comprising:
- determining a hierarchical modulation parameter, the hierarchical modulation parameter being a value that can vary within the network;
- demodulating the signal into first and second bit streams, the signal being demodulated into the first bit stream based on a first constellation and the hierarchical modulation parameter and the signal being demodulated into the second bit stream based on a second constellation in the first constellation.
A communications network that supports at least one of a binary phase-shift keying (BPSK), a quadrature phase-shift keying (QPSK) or a quadrature amplitude modulation (QAM) constellation, the communications network comprising:
- a first transmitter configured to modulate first and second bit streams into a first signal using a first hierarchical modulation parameter and transmit the first signal to a receiver;
- and
- a second transmitter configured to modulate third and fourth bit streams into a second signal using a second hierarchical modulation parameter and transmit the second signal to the receiver, the first signal and the second signal being transmitted at the same frequency.
Dependencies are inferred from the claim text.