Phase noise compensation apparatus and method and receiver
Embodiments of this disclosure provide a phase noise compensation apparatus and method and a receiver, in which modified signals are determined according to estimated values of an imperfection parameter of a transmitter and training sequence signals in transmission signals, and phase noises of the received signals are determined according to the modified signals, hence, an effect of the imperfection parameter of the transmitter on the phase noise is taken into account, and the phase noise may be accurately estimated, thereby performing compensation on the phase noise, and ensuring a transmission efficiency and performance of the system.
1. A phase noise compensation apparatus, comprising:
a memory;
a processor coupled to the memory, the processor configured to:
determine estimated values of an imperfection parameter that affects performance of a transmitter according to received signals,
determine modified signals according to the determined estimated values of the imperfection parameter of the transmitter and training sequence signals interpolated into transmission signals of the transmitter,
determine phase noises of the received signals according to the modified signals, and
perform a phase noise compensation on the received signals according to the phase noises of the received signals,
wherein the processor is further configured to:
determine phase noises corresponding to the training sequence signals according to the received signals at occurrences of the training sequence signals and the modified signals corresponding to the training sequence signals, and
perform interpolation on the phase noises corresponding to the training sequence signals to obtain phase noises of the received signals at all occurrences.
2. The phase noise compensation apparatus according to claim 1 , wherein the processor is further configured to:
multiply the modified signals corresponding to the training sequence signals by the received signals at the occurrences of the training sequence signals after performing a conjugating operation on the modified signals corresponding to the training sequence signals, and
take angles of results of the multiplication to obtain the phase noises corresponding to the training sequence signals.
3. The phase noise compensation apparatus according to claim 2 , wherein the processor is further configured to:
determine a plurality of modified signals corresponding to a plurality of training sequence signals,
multiply the plurality of modified signals respectively by the received signals at occurrences of the plurality of training sequence signals after performing a conjugating operation on the plurality of modified signals to obtain a plurality of results of the multiplication, and
average the plurality of results of the multiplication and take angles of averaged results of the multiplication to obtain the phase noises corresponding to the training sequence signals.
4. The phase noise compensation apparatus according to claim 1 , wherein,
the estimated values of the imperfection parameter of the transmitter comprises at least one of estimated values of amplitude imbalance of an I path and a Q path of the transmitter, phase imbalance of the I path and the Q path of the transmitter, and a transmitter direct current bias.
5. A receiver, comprising the phase noise compensation apparatus as claimed in claim 1 .
6. A phase noise compensation method, comprising:
determining estimated values of an imperfection parameter that affects performance of a transmitter according to received signals;
determining modified signals according to the determined estimated values of the imperfection parameter of the transmitter and training sequence signals interpolated into transmission signals of the transmitter;
determining phase noises of the received signals according to the modified signals; and
performing a phase noise compensation on the received signals according to the phase noises of the received signals,
wherein the determining phase noises of the received signals according to the modified signals comprises:
determining phase noises corresponding to the training sequence signals according to the received signals at occurrences of the training sequence signals and the modified signals corresponding to the training sequence signals, and
performing interpolation on the phase noises corresponding to the training sequence signals to obtain phase noises of the received signals at all occurrences.
7. The phase noise compensation method according to claim 6 , wherein the determining phase noises corresponding to the training sequence signals according to the received signals at the occurrences of the training sequence signals and the modified signals corresponding to the training sequence signals comprises:
multiplying the modified signals corresponding to the training sequence signals by the received signals at occurrences of the training sequence signals after performing a conjugating operation on the modified signals corresponding to the training sequence signals, and
taking angles of results of the multiplication to obtain the phase noises corresponding to the training sequence signals.
8. The phase noise compensation method according to claim 7 , wherein,
a plurality of modified signals corresponding to a plurality of training sequence signals are determined,
the plurality of modified signals are respectively multiplied by the received signals at occurrences of the plurality of training sequence signals after performing a conjugating operation on the plurality of modified signals to obtain a plurality of results of multiplication, and
the plurality of results of the multiplication are averaged and angles of averaged results of the multiplication are taken to obtain the phase noises corresponding to the training sequence signals.