Method and apparatus for a multi-mode multi-rate telemetry transmitter
View Patent ↗A method and apparatus for a multi-mode and multi-rate telemetry transmitter includes a digital baseband lineup, a digital-to-analog converter (“DAC”), and an analog reconstruction filter. The digital baseband lineup may be programmed to any desired bit rate, enabling the transmitter to support multi-rate capabilities. Different coefficients and numerical values may be programmed in the digital baseband lineup to support any desired modulation scheme, enabling the transmitter to support multi-mode capabilities. The digital baseband lineup may be designed by implementing up-sampling stages, down-sampling stages, and digital filters in a variety of arrangements.
1. A multi-rate telemetry transmitter, comprising:
a first digital baseband lineup;
a first digital-to-analog converter in communication with said first digital baseband lineup;
a first analog reconstruction filter in communication with said first digital-to-analog converter;
wherein said first digital baseband lineup is programmable to support any one of a plurality of bit rates; and
wherein said first digital baseband lineup includes:
an up-sampling stage; and
a FIR digital filter in communication with said up-sampling stage.
2. A transmitter as in claim 1 , wherein said first digital baseband lineup is programmable to support any one of a plurality of modulation schemes.
3. A transmitter as in claim 1 , further comprising:
a second digital baseband lineup;
a second digital-to-analog converter in communication with said second digital baseband lineup; and
a second analog reconstruction filter in communication with said second digital-to-analog converter;
wherein said second digital baseband lineup is programmable to support any one of a plurality of bit rates.
4. A transmitter as in claim 1 , wherein said first digital baseband lineup includes a FIR digital filter.
5. A transmitter as in claim 1 , wherein said first digital baseband lineup includes:
an up-sampling stage;
a FIR digital filter in communication with said up-sampling stage; and
a IIR digital filter in communication with said FIR digital filter.
6. A transmitter as in claim 1 , wherein said first digital baseband lineup includes:
an up-sampling stage;
a FIR digital filter in communication with said up-sampling stage; and
a down-sampling stage in communication with said FIR digital filter.
7. A transmitter as in claim 1 , wherein said first digital baseband lineup includes:
a fractional sampling rate interpolator stage;
an up-sampling stage in communication with said fractional sampling rate interpolator stage; and
a FIR digital filter in communication with said up-sampling stage.
8. A transmitter as in claim 1 , wherein said first digital baseband lineup includes:
a fractional sampling rate interpolator stage; a first up-sampling stage in communication with said fractional sampling rate interpolator stage;
a FIR digital filter in communication with said first up-sampling stage;
a second up-sampling stage in communication with said FIR digital filter; and
an interpolation FIR digital filter in communication with said second up-sampling stage.
9. A transmitter as in claim 1 , wherein said first digital baseband lineup includes:
a fractional sampling rate interpolator stage;
a first up-sampling stage in communication with said fractional sampling rate interpolator stage;
a FIR digital filter in communication with said first up-sampling stage; and a second up-sampling stage in communication with said FIR digital filter.
10. A method for supporting multi-rate capabilities in a telemetry transmitter, comprising:
providing a digital baseband lineup, wherein said digital baseband lineup is programmable to support any one of a plurality of bit rates;
providing a digital-to-analog converter to be in communication with said digital baseband lineup;
providing an analog reconstruction filter to be in communication with said digital-to-analog converter; and
programming said digital baseband lineup to support a desired bit rate;
wherein said digital baseband lineup includes:
an up-sampling stage;
a FIR digital filter in communication with said up-sampling stage; and
a IIR digital filter in communication with said FIR digital filter.
11. A method as in claim 10 , further comprising:
programming said digital baseband lineup to support a desired modulation scheme.
12. A method as in claim 10 , wherein said digital baseband lineup includes:
an up-sampling stage;
a FIR digital filter in communication with said up-sampling stage;
a down-sampling stage in communication with said FIR digital filter; and
a IIR digital filter in communication with said down-sampling stage.
13. A method as in claim 10 , wherein said digital baseband lineup includes:
a fractional sampling rate interpolator stage;
an up-sampling stage in communication with said fractional sampling rate interpolator stage; and
a FIR digital filter in communication with said up-sampling stage.
14. A method as in claim 10 , wherein said digital baseband lineup includes:
a fractional sampling rate interpolator stage;
a first up-sampling stage in communication with said fractional sampling rate interpolator stage;
a FIR digital filter in communication with said first up-sampling stage;
a second up-sampling stage in communication with said FIR digital filter; and
an interpolation FIR digital filter in communication with said second up-sampling stage.
15. A method as in claim 10 , wherein said digital baseband lineup includes:
a fractional sampling rate interpolator stage;
a first up-sampling stage in communication with said fractional sampling rate interpolator stage;
a FIR digital filter in communication with said first up-sampling stage;
a second up-sampling stage in communication with said FIR digital filter; and
a IIR digital filter in communication with said second up-sampling stage.
16. A method for supporting multi-rate capabilities in a telemetry transmitter, comprising:
programming a digital baseband lineup to support a desired bit rate, wherein said digital baseband lineup is programmable to support any one of a plurality of bit rates;
processing a plurality of buffered data symbols using said digital baseband lineup to generate a digital signal;
converting said digital signal to an analog signal; filtering said analog signal;
up-sampling said plurality of buffered data symbols to produce samples;
pulse-shaping said samples to produce an output; and
filtering said output to produce said digital signal.
17. A method as in claim 16 , further comprising:
programming said digital baseband lineup to support a desired modulation scheme.