Method and system for communicating sub-synchronization signals using a phase rotator
AssigneeDelphi Technologies, Inc.
InventorsGlenn A. Walker, Eric A. DiBiaso
Life of this patent
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Abstract
A system and method of communicating sub-synchronization information into a transmitted digital audio stream and extracting sub-synchronization information from a received digital audio stream is provided. The method includes the steps of having a transmitter introduce sub-synchronization information into a data stream at a period less than that of existing transmitter pre-amble signals, and transmitting that data to a receiver. The method further includes the steps of receiving the transmitted data stream in the receiver circuitry, extracting the synchronization information, and using the synchronization information to accurately decode the received audio data.
Claims25
A method for communicating sub-synchronization information in a communication system, comprising the steps of:
- generating a data stream comprising pre-amble information having a first period;
- introducing phase-rotated sub-synchronization information into the data stream at a second period less than that of the first period of the pre-amble information, wherein a modified signal has a wobbling effect that is biased in a known direction;
- transmitting the modified signal comprising the data stream containing the sub-synchronization information to one or more receivers;
- receiving via one or more updated, coherent receivers the modified transmitted signal containing the sub-synchronization information, wherein the introduction of the sub-synchronization information comprises the sub-synchronization information modifying data in the data stream;
- switching among a plurality of antennas, and passing the received signal from one antenna;
- extracting the sub-synchronization information from the transmitted signal via the one or more updated, coherent receivers;
- decoding the transmitted signal using the extracted sub-synchronization information via the one or more updated, coherent receivers, wherein the extracted sub-synchronization information is used to correct for at least one of phase and polarity ambiguity in the received signal, the phase ambiguities being resolved based upon the wobbling effect being biased in a known direction, wherein a quadrature (“Q”) bit ambiguity and an in-phase (“I”) bit ambiguity are resolved at different times, which allows for quickly switching among the plurality of antennas;
- and
- receiving via one or more non-updated receivers, the modified transmitted signal, wherein the sub-synchronization information appears as noise,
- wherein the Q ambiguity is solved by an algorithm comprising if Q data=1, then send I=I and Q=1, else send I=sign (I)*sqrt (2) and Q=0, and the I ambiguity is solved by an algorithm comprising if I data=1, then send Q=Q and I=1, else send Q=sign (Q)*sqrt (2) and I=0.
A system for transmitting and receiving communication signals containing a sub-synchronization information having a period less than that of an existing pre-amble signal, comprising:
- at least one communication signal transmitter for transmitting a modified signal comprising a data stream having pre-amble signals at a first period, the transmitter comprising
- a phase rotator for introducing sub-synchronization information into the data stream at a second period, wherein the introduction of the sub-synchronous information comprises the sub-synchronous information modifying data in the data stream less than that of the first period, and the modified signal has a wobbling effect that is biased in a known direction;
- at least one updated, coherent communication signal receiver for receiving the modified transmitted signal, the receiver comprising
- a sub-synchronization correlator for extracting the sub-synchronization information from the signal received from the transmitter and
- an antenna selector configured to switch among a plurality of antennas, and passing the received signal from one antenna, said receiver further decoding the transmitted signal using the extracted sub-synchronization information, wherein the modified transmitted signal is used to correct both an in-phase bit ambiguity and a quadrature bit ambiguity, the phase ambiguities being resolved based upon the wobbling effect being biased in a known direction, wherein a quadrature (“Q”) bit ambiguity and an in-phase (“I”) bit ambiguity are resolved at different times, such that the Q ambiguity is solved by an algorithm comprising if Q data=1, then send I=I and Q=1, else send I=sign (I)*sqrt (2) and Q=0, and the I ambiguity is solved by an algorithm comprising if I data=1, then send Q=Q and I=1, else send Q=sign (Q)*sqrt (2) and I=0, which allows for quickly switching among the plurality of antennas;
- and
- at least one non-updated communication signal receiver for receiving the modified transmitted signal, wherein the sub-synchronization information appears as noise.
Dependencies are inferred from the claim text.