Channel equalization and tracking apparatus and method and receiver
A channel equalization and tracking apparatus and method and a receiver. The apparatus includes: a Fourier transforming unit configured to transform a received time-domain signal into a frequency-domain signal; a compensating and equalizing unit configured to perform phase compensation and frequency-domain equalization on the signal outputted by the Fourier transforming unit by using one time of multiplication according to time delay information and an equalizer coefficient; a deciding unit configured to decide the equalized signal; and a channel tracking unit configured to track a channel according to the signal outputted by the Fourier transforming unit and an error signal obtained by the deciding unit. With embodiments of the present disclosure, not only complexity and hardware demands of the whole system are lowered, but also performance of the system is not affected.
1. A channel equalization and tracking apparatus, comprising:
a Fourier transforming unit configured to transform a received time-domain signal into a frequency-domain signal;
a compensating and equalizing unit configured to perform phase compensation and frequency-domain equalization on the frequency domain signal outputted by the Fourier transforming unit by using one time of multiplication according to time delay information and an equalizer coefficient;
a deciding unit configured to decide an equalized signal; and
a channel tracking unit configured to track a channel according to the frequency domain signal outputted by the Fourier transforming unit and an error signal obtained by the deciding unit using the equalized signal.
2. The channel equalization and tracking apparatus according to claim 1 , wherein the apparatus further comprises:
a phase rotating unit configured to calculate phase error(s) of one or more subcarriers according to the time delay information and the frequency-domain signal outputted by the Fourier transforming unit to obtain a phase offset of a designated sub-channel, and perform phase rotation on the designated sub-channel according to the phase offset;
and the channel tracking unit is further configured to track the channel according to a phase rotated signal outputted by the phase rotating unit and the error signal obtained by the deciding unit.
3. The channel equalization and tracking apparatus according to claim 2 , wherein the phase rotating unit is configured to calculate the phase error(s) of one or more subcarriers using:
Ph
k
=
2
π
F
k
F
s
T
;
where, T is a residual time error, Fk is a central frequency of a k-th subcarrier, Fs is a system sampling frequency, and Phk is a phase error of the k-th subcarrier.
4. A channel equalization and tracking method, comprising:
transforming a received time-domain signal into a frequency-domain signal by using a Fourier transform;
performing phase compensation and frequency-domain equalization on a Fourier transformed frequency domain signal by using one time of multiplication according to time delay information and an equalizer coefficient;
deciding an equalized signal; and
tracking a channel according to the Fourier transformed signal and an error signal obtained by the deciding using the equalized signal.
5. The channel equalization and tracking method according to claim 4 , wherein the method comprises:
calculating phase error(s) of one or more subcarriers according to the time delay information and the Fourier transformed frequency domain signal to obtain a phase offset of a designated sub-channel, and performing phase rotation on the designated sub-channel according to the phase offset; and
tracking the channel according to a phase rotated signal and the error signal obtained by the deciding.
6. The channel equalization and tracking method according to claim 5 , wherein the phase error(s) of one or more subcarriers being calculated using:
Ph
k
=
2
π
F
k
F
s
T
;
where, T is a residual time error, Fk is a central frequency of a k-th subcarrier, Fs is a system sampling frequency, and Phk is a phase error of the k-th subcarrier.
7. A receiver, comprising the channel equalization and tracking apparatus as claimed in claim 1 .
8. A channel equalization and tracking apparatus, comprising:
a computer comprising:
a Fourier transform unit configured to transform a received time-domain signal into a frequency-domain signal;
a compensating and equalizing unit configured to perform phase compensation and frequency-domain equalization on the frequency domain signal using a multiplication of time delay information and an equalizer coefficient to produce a compensated and equalized frequency domain signal;
a deciding unit configured to obtain an error signal using the compensated and equalized frequency domain signal; and
a channel tracking unit configured to track a channel using the compensated and equalized frequency domain signal and the error signal.
9. A non-transitory computer readable storage medium storing a channel equalization and tracking method, the method comprising:
transforming a received time-domain signal into a frequency-domain signal using a Fourier transform;
performing phase compensation and frequency-domain equalization on the frequency domain signal by using a multiplication of time delay information and an equalizer coefficient to produce a compensated and equalized frequency domain signal;
deciding an error signal using the compensated and equalized frequency domain signal; and
tracking a channel using the compensated and equalized frequency domain signal and the error signal.