Joint synchronization and modulation scheme for energy-efficient communication
AssigneeAlcatel-Lucent USA Inc.
InventorsUrs NIESEN, Piyush GUPTA, Yu-Chih HUANG
Life of this patent
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Abstract
A system including a transmitter and a receiver that are loosely synchronized, the transmitter encodes signal waveforms having a start time, a width and a height that are determined based on a range of possible relative drifts of a receiver clock with respect to a transmitter clock and the receiver decodes the waveforms based on a sequence of tests, chosen to account for any uncertainty that may arise due to the lack of tight synchronization.
Claims23
A transmitter configured to communicate a first one of a plurality of messages to a receiver having a receiver clock, the transmitter comprising:
- a transmitter clock configured to generate a clock signal that controls timing of the transmitter, a timing of the transmitter clock running independent of a timing of the receiver clock;
- and
- a modulator including a processor configured to,
- determine a start time, a width and a height of a pulse representing the first message based on a range of possible relative drifts of the receiver clock with respect to the transmitter clock,
- generate the determined pulse, and
- transmit the generated pulse to the receiver.
A receiver configured to receive a waveform that includes a pulse representing a first of the plurality of messages from a transmitter having a transmitter clock, the receiver comprising:
- a receiver clock configured to generate a clock signal that controls timing of the receiver, a timing of the receiver clock running independent from the transmitter clock;
- a matched filter bank configured to contain a plurality of sample waveforms for at least one of the plurality of messages and output a plurality of values based on the received waveform and the plurality of sample waveforms;
- and
- a detector including a processor configured to estimate the first message based on the plurality of values output by the matched filter bank.
A system comprising:
- a transmitter and a receiver,
- the transmitter configured to communicate a first one of a plurality of messages to the receiver having a receiver clock, the transmitter including,
- a transmitter clock configured to generate a transmitter clock signal that controls timing of the transmitter, a timing of the transmitter clock running independent of a timing of the receiver clock;
- and
- a modulator including a processor configured to,
- determine a start time, a width and a height of a pulse representing the first message based on a range of possible relative drifts of the receiver clock with respect to the transmitter clock,
- generate the determined pulse, and
- transmit the generated pulse to the receiver;
- the receiver configured to receive a waveform that includes the pulse representing the first of the plurality of messages, the receiver including,
- a matched filter bank configured to contain a plurality of sample waveforms for at least one of the plurality of messages and output a plurality of values based on the received waveform and the plurality of sample waveforms;
- and
- a detector including a processor configured to estimate the first message based on the plurality of values output by the matched filter bank.
A method of communicating a first one of a plurality of messages from a transmitter operating according to a transmitter clock to a receiver operating according to a receiver clock, the method comprising:
- determining a start time, a width and a height of a pulse representing the first message based on a range of possible relative drifts of the receiver clock with respect to the transmitter clock;
- generating the determined pulse;
- and
- transmitting the generated pulse to the receiver.
Dependencies are inferred from the claim text.