A method and an apparatus for determining a noise shaped quantized parameter contributing to the generation of an output signal

Patent metadata

Field	Value
Publication number	US-2018262384-A1
Application number	US-201615750257-A
Country	US
Kind code	A1
Filing date	Aug 2, 2016
Priority date	Sep 25, 2015
Publication date	Sep 13, 2018
Grant date	—

Abstract

A method for determining a noise shaped quantized parameter contributing to generation of an output signal comprises estimating an error within the output signal using a quantization of the parameter and a quantization of a further parameter contributing to generation of the output signal. The quantization of the parameter is used as the noise shaped quantized parameter according to a selection criterion.

First claim

1 - 25 . (canceled)

26 . A method for determining a noise shaped quantized parameter contributing to generation of an output signal, comprising:
estimating an error within the output signal using a quantization of the parameter and a quantization of a further parameter contributing to generation of the output signal; and using the quantization of the parameter as the noise shaped quantized parameter according to a selection criterion.

27 . The method of claim 26 , further comprising:
calculating a first estimated error within the output signal using a first quantization of the parameter and a first quantization of the further parameter; calculating a second estimated error within the output signal using a second quantization of the parameter and the first quantization of the further parameter; and using the quantization of the parameter resulting in the lower estimated error as the noise shaped quantized parameter.

28 . The method of claim 26 , further comprising:
calculating a third estimated error within the output signal using the first quantization of the parameter and a second quantization of the further parameter; calculating a fourth estimated error within the output signal using the second quantization of the parameter and the second quantization of the further parameter; and using the quantization of the parameter and the quantization of the further parameter resulting in the lowest estimated error as the noise shaped quantized parameter and as a noise shaped quantized further parameter.

29 . The method of claim 27 , wherein the first quantization corresponds to the smallest possible distance between the first quantization of the parameter and the parameter; and wherein the second quantization corresponds to the second smallest possible distance between the second quantization of the parameter and the parameter for the quantization scheme used.

30 . The method of claim 27 , wherein calculating the first estimated error and the second estimated error comprises:
using an information on a notch frequency at which the error within the a spectrum of the output signal shall be small.

31 . The method of claim 26 , wherein the parameter corresponds to a phase value of an output signal and wherein the further parameter corresponds to a radius value of the output signal.

32 . The method of claim 31 , wherein the calculation of the first estimated error Q new1 and of the second estimated error Q new2 is based on the following expressions:
Q new1 =Q old +rad closest *2**[cos− I *sin];
Q new2 =Q old +rad closest *2**[cos− I *sin]; wherein
rad closest corresponds to the radius value, T real corresponds to the parameter, T closest corresponds to the first quantization of the parameter T real , T secondClosest corresponds to the second quantization of the parameter T real , w 0 corresponds to the notch frequency and Q old corresponds to a remaining error contribution of an antecedent quantization.

33 . A method for generating a radio frequency signal based on a phase value as a parameter and a radius value as a further parameter, comprising:
calculating a first estimated error within the radio frequency signal using a first quantization of the phase value and a quantization of the radius value; calculating a second estimated error within the radio frequency signal using a second quantization of the phase value and the quantization of the radius value; and using the quantization of the phase value resulting in the lower estimated error as a noise shaped quantized phase value.

34 . The method of claim 33 , wherein the calculation of the first estimated error and the calculation of the second estimated error use a remaining error contribution of an antecedent quantization.

35 . The method of claim 33 , further comprising:
using the noise shaped quantized phase value to determine a first analog signal having a phase characteristic depending on the quantized phase value; and using the quantization of the radius value to determine a second analog signal having an amplitude depending on the quantized radius value.

36 . The method of claim 35 , further comprising:
combining the first analog signal and the second analog signal to generate the radio frequency signal.

37 . A noise shaper for determining a noise shaped quantized parameter contributing to generation of an output signal, comprising:
an error estimation component configured to receive a parameter and a further parameter contributing to the generation of the output signal, comprising: quantization circuitry configured to calculate a quantization of the parameter and a quantization of the further parameter; error calculation circuitry configured to calculate an error within the output signal using the quantization of the parameter and the quantization of the further parameter; and a decision making component configured to decide on a use of the quantization of the parameter as the noise shaped quantized parameter depending on the calculated error and a selection criterion.

38 . The noise shaper of claim 37 , wherein:
the quantization circuitry is configured to calculate a first quantization of the parameter and a second quantization of the parameter; the error calculation circuitry is configured to calculate a first estimated error within the output signal using the first quantization of the parameter and the quantization of the further parameter and to calculate a second estimated error within the output signal using the second quantization of the parameter and the quantization of the further parameter; and the decision making component comprises a comparator configured to compare the first estimated error and the second estimated error to decide on the use of the quantization of the parameter resulting in the lower estimated error.

39 . The noise shaper of claim 38 , wherein:
the quantization circuitry is further configured to calculate a first quantization of the further parameter and a second quantization of the further parameter; the error calculation circuitry is further configured to calculate a third estimated error within the output signal using the first quantization of the parameter and the second quantization of the further parameter and a fourth estimated error within the output signal using the second quantization of the parameter and the second quantization of the further parameter; and the comparator of the decision making component is configured to decide on the use of the quantization of the parameter and the quantization of the further parameter resulting in the lowest estimated error.

40 . An apparatus for determining a noise shaped quantized parameter contributing to generation of an output signal, comprising:
an error estimating means adapted to estimate an error within the output signal using a quantization of the parameter and a quantization of a further parameter contributing to generation of the output signal; and a processing means adapted to implement the quantization of the parameter as the noise shaped quantized parameter depending on a selection criterion.

41 . The apparatus of claim 40 , further comprising:
means for calculating a first estimated error within the output signal using a first quantization of the parameter and a first quantization of the further parameter; means for calculating a second estimated error within the output signal using a second quantization of the parameter and the first quantization of the further parameter; and means for using the quantization of the parameter resulting in the

Assignees

• Intel Ip Corp

Inventors

• Menkhoff Andreas
• Ibrahim Mohamed

Classifications

• G01R29/26

  Measuring noise figure; Measuring signal-to-noise ratio · CPC title

• H04L27/365

  Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier) · CPC title

• H04L27/2092

  with digital generation of the modulated carrier (does not include the modulation of a digitally generated carrier) · CPC title

• H04L27/361

  Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation · CPC title

• H04L27/368 Primary

  adaptive predistortion · CPC title