Method and apparatus for frequency domain ripple compensation for a communications transmitter
First Claim
Patent Images
1. A transmitter for providing a filtered data stream, comprising:
- an interface circuit for receiving a data stream and for generating a frequency encoded data stream; and
a gain circuit coupled to the interface circuit for receiving the frequency encoded data stream, the gain circuit scaling the frequency encoded data stream by a scale factor to create an adjusted data stream, wherein the scale factor generates a desired passband variation in the filtered data stream.
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Abstract
A data stream to be transmitted is received by a digital interface (52) and converted into a frequency encoded data. A gains block (54) receives the frequency encoded data and a gain adjustment signal, and produces a gain adjusted data to compensate for undesirable system level passband gain variation. The gain adjusted data is converted to a time domain data. The time domain data is processed by a high-pass and a droop correction filter (58, 59) to produce a filtered data. The filtered data is provided through an analog front-end (60) in order to provide a filtered analog data.
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Citations
34 Claims
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1. A transmitter for providing a filtered data stream, comprising:
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an interface circuit for receiving a data stream and for generating a frequency encoded data stream; and a gain circuit coupled to the interface circuit for receiving the frequency encoded data stream, the gain circuit scaling the frequency encoded data stream by a scale factor to create an adjusted data stream, wherein the scale factor generates a desired passband variation in the filtered data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for operating a transmitter, comprising the steps of:
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receiving a data stream; determining a data stream power spectral density; determining a variation between the data stream power spectral density and an ideal power spectral density; generating a gain adjustment in response to the variation; and adjusting the data stream power spectral density using the gain adjustment to be substantially identical to the ideal power spectral density. - View Dependent Claims (19, 20, 21)
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22. A method for operating a communication system, comprising the steps of:
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providing an input data stream to the communication system with an ideal frequency response; obtaining a data stream from the communication system in response to the input data stream; converting the data stream from a time domain to a frequency domain to generate a frequency encoded data stream; determining a gain variation between the ideal frequency response and a response of the frequency encoded data stream; defining a gain factor to compensate for the gain variation; and scaling the frequency encoded data stream by the gain factor to generate a gain adjusted data stream. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A communication system, comprising:
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a digital interface for receiving a data stream; and a scaling circuit for selectively scaling the data stream by a scale factor to provide an adjusted data stream, the scale factor being determined in response to a variation between an ideal power spectral density of an input signal and an actual power spectral density of the input signal. - View Dependent Claims (32, 33, 34)
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Specification