Data recovery system and applications thereof in radio receivers
First Claim
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1. A method for data recovery, the method comprises:
- receiving an encoded signal at a transmit symbol rate, wherein the encoded signal includes first data values having a positive sign with respect to a reference and second data values having a negative sign with respect to the reference;
determining at least one reference crossing of the encoded signal;
determining a sampling phase based on the at least one reference crossing and a system symbol rate to produce a determined sampling phase; and
sampling the encoded signal at the determined sampling phase with respect to the system symbol rate to recapture data from the encoded signal.
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Abstract
A method and apparatus for data recovery includes processing that begins by receiving an encoded signal at a transmit symbol rate. Such an encoded signal includes data that is represented by positive and negative pulses. The processing continues by determining at least one reference crossing of the encoded signal (e.g., detecting a 0 crossing). The processing then continues by determining a sampling phase of a system symbol rate based on the reference crossing. The processing then continues by sampling the encoded signal at the determined sampling phase with respect to the system symbol rate to recapture the data.
14 Citations
27 Claims
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1. A method for data recovery, the method comprises:
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receiving an encoded signal at a transmit symbol rate, wherein the encoded signal includes first data values having a positive sign with respect to a reference and second data values having a negative sign with respect to the reference;
determining at least one reference crossing of the encoded signal;
determining a sampling phase based on the at least one reference crossing and a system symbol rate to produce a determined sampling phase; and
sampling the encoded signal at the determined sampling phase with respect to the system symbol rate to recapture data from the encoded signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A data recovery module comprises:
- processing module; and
memory operably coupled to the processing module, wherein the memory includes operational instructions that cause the processing module to;
receive an encoded signal at a transmit symbol rate, wherein the encoded signal includes first data values having a positive sign with respect to a reference and second data values having a negative sign with respect to the reference;
determine at least one reference crossing of the encoded signal;
determine a sampling phase based on the at least one reference crossing and a system symbol rate to produce a determined sampling phase; and
sample the encoded signal at the determined sampling phase with respect to the system symbol rate to recapture data from the encoded signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26)
- processing module; and
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20. A radio receiver comprises:
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low noise amplifier operably coupled to amplify a radio frequency (RF) signal to produce an amplified RF signal;
frequency step-down section operably coupled to step-down frequency of the amplified RF signal to provide an intermediate frequency signal;
bandpass filter operably coupled to pass frequency components of the intermediate frequency signal in a bandpass range and to substantially attenuate frequency components of the intermediate frequency signal outside of the bandpass range to produce a filtered signal;
analog to digital converter operably coupled to convert the filtered signal into a digital signal;
digital intermediate frequency demodulator operably coupled to demodulate the digital signal to produce a demodulated signal; and
data and timing recovery module operably coupled to recapture data from the demodulated signal, wherein the data and timing recovery module includes;
DC offset estimation module to generates a DC offset from the demodulated signal;
subtraction module operably coupled to subtract the DC offset from the demodulated data to produce an encoded signal; and
timing recovery module operably coupled to sample the encoded signal at a determined sampling phase with respect to a system symbol rate to produce the recaptured data, wherein the timing recovery determines the determined sampling phased based on at least one reference crossing of the encoded signal. - View Dependent Claims (21, 27)
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Specification