Apparatus and method of adaptive filter
DC CAFCFirst Claim
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1. A method of adapting a filter for compensating deviation of actual parameter of a phase modulation unit in a polar modulation transmitter, the method comprising:
- measuring actual parameters related to a phase modulation unit, wherein the actual parameters comprise a Voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β
) and loop filter (H(S)); and
generating the filter based on measured values of the actual parameters and stored predetermined filters coefficients for providing a compensated signal to compensate deviation of the at least one actual parameter of the phase modulation unit.
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Abstract
Briefly, according to some embodiments of the invention a method and apparatus to generate a filter are provided. The apparatus may include a phase modulation unit to vary a phase component of a signal, a measurement unit to measure a parameter of the phase modulation unit and a filter generator to generate a filter based on the parameter. In some embodiments of the invention, the filter is adapted to provide a compensated signal to the phase modulation unit to compensate for deviation of the parameter.
8 Citations
20 Claims
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1. A method of adapting a filter for compensating deviation of actual parameter of a phase modulation unit in a polar modulation transmitter, the method comprising:
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measuring actual parameters related to a phase modulation unit, wherein the actual parameters comprise a Voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β
) and loop filter (H(S)); andgenerating the filter based on measured values of the actual parameters and stored predetermined filters coefficients for providing a compensated signal to compensate deviation of the at least one actual parameter of the phase modulation unit. - View Dependent Claims (2, 3, 4)
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5. A communication device comprising:
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a phase modulation unit to vary a phase component of a signal; a measurement unit to measure a voltage controlled oscillator gain (Kv), an integer frequency division ration(N), a fractional division ratio (β
) and a loop filter (H(s)), wherein Kv, N, β
, and H(s) are actual parameters of the phase modulation unit;a filter generator to generate a filter based on the actual parameters and a predetermined filter of a matrix of predetermined filters, wherein the filter is adapted to provide a compensated signal to the phase modulation unit to compensate for deviation of at least one actual parameter of the actual parameters Kv, N, β
, and H(S). - View Dependent Claims (6, 7, 8)
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9. A communication device comprising:
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an internal antenna to transmit a signal; an amplitude path and a phase path to provide polar modulation to the signal, both operably coupled to a power amplifier and wherein the phase path comprises; a matrix of predetermined filters stored in a memory; a phase modulation unit to vary a phase component of the transmit signal; a measurement unit to measure a voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β
) and a loop filter (H(S)), wherein Kv, N, β and
H(S) are actual parameters of the phase modulation unit; anda filter generator to generate a filter based on the actual parameters and a predetermined filter of a matrix of predetermined filters, wherein the filter is adapted to provide a compensated signal to the phase modulation unit to compensate for deviation of at least one actual parameter of the actual parameters Kv, N, β and
H(S). - View Dependent Claims (10, 11, 12)
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13. A communication system for generating a filter in a transmitter comprising, in a transmitter;
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a wireless communication device that includes a phase modulation unit to vary a phase component of a signal; a measurement unit to measure a voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β
) and a loop filter (H(S)), wherein Kv, N, β and
H(S) are actual parameters of the phase modulation unit; anda filter generator to generate a filter based on the actual parameters and a predetermined filter of a matrix of predetermined filters, wherein the filter is adapted to provide a compensated signal to the phase modulation unit to compensate for deviation of at least one actual parameter of the actual parameters Kv, N, β and
H(S). - View Dependent Claims (14, 15, 16)
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17. An article for generating a filter in a transmitter comprising storage medium, having stored thereon instructions that, when executed, result in, in a transmitter:
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measuring actual parameters related to a phase modulation unit, wherein the actual parameters comprise a Voltage controlled oscillator gain (Kv), an integer frequency division ratio (N), a fractional division ratio (β
) and loop filter (H(S)); andgenerating the filter based on measured values of the actual parameters and stored predetermined filters coefficients for providing a compensated signal to compensate deviation of the at least one actual parameter of the phase modulation unit. - View Dependent Claims (18, 19, 20)
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Specification