Signal receiving apparatus and signal processing method thereof
AssigneeMStar Semiconductor, Inc.
InventorsChia-Chun Hung, Ting-Nan Cho, Kai-Wen Cheng, Tai-Lai Tung
Life of this patent
Estimating the term…
Abstract
A signal receiving apparatus includes a phase recovery look, a phase estimation circuit, a phase noise detection circuit, and a bandwidth setting circuit. The phase recovery loop performs a phase recovery process on an input signal according to a bandwidth setting. The phase estimation circuit generates an estimated phase associated with the input signal. The phase noise detection circuit determines a phase noise amount according to the estimated phase. The bandwidth setting circuit calculates an average and a variance of the phase noise amounts, and adjusts the bandwidth setting of the phase recovery loop according to the average and the variance.
Claims14
A signal processing apparatus, comprising:
- a phase recovery loop, performing a phase recovery process on an input signal according to a bandwidth setting;
- a phase estimation circuit, generating an estimated phase associated with the input signal;
- a phase noise detection circuit, determining a phase noise amount according to the estimated phase;
- and
- a bandwidth setting circuit, calculating an average and a variance of the phase noise amount, and adjusting the bandwidth setting of the phase recovery loop according to the average and the variance,
- wherein the bandwidth setting circuit comprises:
- a detection circuit, detecting a channel quality of a communication channel where the signal processing apparatus is located to acquire a channel quality indicator;
- a threshold setting circuit, determining a first threshold and a second threshold according to the channel quality indicator;
- a first comparison circuit, comparing the average with the first threshold to generate a first comparison result;
- a second comparison circuit, comparing the variance or a value associated with the variance with the second threshold to generate a second comparison result;
- a control circuit, generating a control signal according to the first comparison result and the second comparison result;
- and
- a selection circuit, selecting one bandwidth setting from a plurality of bandwidth settings and providing the one bandwidth setting to the phase recovery loop.
A signal processing method, applied to a signal receiving apparatus, comprising:
- (a) generating an estimated phase associated with an input signal;
- (b) determining a phase noise amount according to the estimated phase;
- (c) calculating an average and a variance of the phase noise amount;
- and
- (d) adjusting, according to the average and the variance, a bandwidth setting of a phase recovery process performed on the input signal,
- wherein step (d) comprises:
- (d1) detecting a channel quality of a communication channel where the signal receiving apparatus is located to acquire a channel quality indicator;
- (d2) determining a first threshold and a second threshold according to the channel quality indicator;
- (d3) comparing the average with the first threshold to generate a first comparison result;
- (d4) comparing the variance or a value associated with the variance with the second threshold to generate a second comparison result;
- (d5) generating a control signal according to the first comparison result and the second comparison result;
- and
- (d6) selecting one bandwidth setting from a plurality of bandwidth settings and providing the one bandwidth setting to the phase recovery process to use.
Dependencies are inferred from the claim text.