Rectangular-to-polar conversion angle quantizer
AssigneeNorthrop Grumman Corporation
InventorHanna S. Hsu
Life of this patent
Estimating the term…
Abstract
A normalizer (70) truncates a variable plurality of numbers of least significant bits of input I and Q words representing an original phase angle in rectangular coordinates. A read only memory (90′) generates a phase signal representing a resultant phase angle range in polar coordinates that includes the original phase angle.
Claims10
In a communication system, apparatus for converting phase information represented by digital words comprising a plurality of bits from rectangular form to polar form comprising in combination:
- an input receiving one or more of said digital words representing an original phase angle in rectangular form;
- a normalizer connected to truncate a plurality of the bits of said digital words to form truncated words;
- and
- a signal generator connected to generate a variable phase angle signal representing a resultant phase angle range including said original phase angle depending at least in part on the number of said bits truncated by said normalizer;
- wherein the plurality of truncated bits comprise least significant bits of said digital words, wherein said normalizer truncates a maximum number of said least significant bits, and wherein said resultant phase angle range depends at least in part on said maximum number.
In a communication system, apparatus for converting phase information represented by digital words comprising a plurality of bits from rectangular form to polar form comprising in combination:
- an input receiving one or more of said digital words representing an original phase angle in rectangular form;
- a normalizer connected to truncate a plurality of the bits of said digital words to form truncated words;
- and
- a signal generator connected to generate a variable phase angle signal representing a resultant phase angle range including said original phase angle depending at least in part on the number of said bits truncated by said normalizer;
- wherein said normalizer truncates a variable plurality of numbers of least significant bits up to a maximum number of least significant bits from said digital words to form truncated words representing a range of phase angles including the original phase angle, each of said variable plurality of numbers representing a different range of truncation phase angles including the original phase angle;
- and
- wherein said resultant phase angle range is derived at least in part from an average of the truncation phase angles.
In a communication system, a method for converting phase information represented by digital words comprising a plurality of bits from rectangular form to polar form comprising in combination:
- receiving one or more of said digital words representing an original phase angle in rectangular form;
- truncating a plurality of the bits of said digital words to form truncated words using a normalizer;
- and
- generating a variable phase angle signal representing a resultant phase angle range including said original phase angle depending at least in part on the number of said bits truncated by said normalizer;
- wherein said plurality of truncated bits comprise least significant bits of said digital words, wherein the truncating comprises truncating a maximum number of said least significant bits, and wherein said resultant phase angle range depends at least in part on said maximum number.
In a communication system, a method for converting phase information represented by digital words comprising a plurality of bits from rectangular form to polar form comprising in combination:
- receiving one or more of said digital words representing original phase angle in rectangular form;
- truncating a plurality of the bits of said digital words to form truncated words using a normalizer;
- and
- generating a variable phase angle signal representing resultant phase angle range including said original phase angle depending at least in part on the number of said bits truncated by said normalizer;
- wherein said truncating comprises truncating a variable plurality of numbers of least significant bits up to a maximum number of least significant bits from said digital words to form said truncated words representing a range of phase angles including the original phase angle, each of said variable plurality of numbers representing a different range of truncation phase angles including the original phase angle;
- and
- wherein said resultant phase angle range is derived at least in part from an average of the truncation phase angles.
Dependencies are inferred from the claim text.