Reduced complexity intercarrier interference cancellation
View Patent ↗Described is a transmission system for transmitting a multicarrier signal from a transmitter ( 10 ) to a receiver ( 20 ). The receiver ( 20 ) comprises an equalizer ( 24 ) for canceling intercarrier interference which may be included in the received multicarrier signal. The equalizer ( 24 ), which preferably is a MMSE equalizer, comprises a reduced complexity filter for deriving a vector of estimated symbols ( 25 ) from a vector of received symbols ( 23 ). The reduced complexity filter comprises a multiplication of an approximation of an inverse matrix R −1 with the vector of received symbols ( 23 ). The approximation of the inverse matrix R −1 is preferably a first order approximation.
1. A transmission system, the transmission system comprising:
a transmitter for transmitting a multicarrier signal; and
a receiver for receiving the multicarrier signal from the transmitter, the receiver comprising an equalizer for canceling intercarrier interference included in the received multicarrier signal, wherein the equalizer comprises a fitter having a complexity less than cubic with respect to a number of subcarriers, said filter deriving a vector of estimated symbols from a vector of received symbols;
wherein said filter is implemented by approximating an inverse matrix R −1 .
2. the transmission system according to claim 1 , wherein the equalizer is a MMSE equalizer.
3. The transmission system according to claim 1 , wherein the reduced complexity filter implements a multiplication of an approximation of the inverse matrix R −1 with the vector of received symbols.
4. The transmission system according to claim 3 , wherein the approximation of the inverse matrix R −1 is a first order approximation.
5. A receiver for receiving a multicarrier signal from a transmitter, the receiver comprising an equalizer for canceling intercarrier interference included in the received multicarrier signal, wherein the equalizer comprises a filter having a complexity less than cubic with respect to a number of subcarriers, said filter deriving a vector of estimated symbols from a vector of received symbols;
wherein said filter is implemented by approximating an inverse matrix R −1 .
6. the receiver according to claim 5 , wherein the equalizer is a MMSE equalizer.
7. The receiver according to claim 5 , wherein the reduced complexity filter implements a multiplication of an approximation of the inverse matrix R −1 with the vector of received symbols.
8. The receiver according to claim 7 , wherein the approximation of the inverse matrix R −1 is a first order approximation.
9. An equalizer for canceling intercarrier interference included in the received multicarrier signal, wherein the equalizer comprises a filter having a complexity less than cubic with respect to a number of subcarriers, said filter deriving a vector of estimated symbols from a vector of received symbols;
wherein said filter is implemented by approximating an inverse matrix R −1 .
10. The equalizer according to claim 9 , wherein the equalizer is a MMSE equalizer.
11. The equalizer according to claim 9 , wherein the reduced complexity filter implements a multiplication of an approximation of the inverse matrix R −1 with the vector of received symbols.
12. The equalizer according to claim 11 , wherein the approximation of the inverse matrix R −1 is a first order approximation.
13. A method for canceling intercarrier interference included in a received multicarrier signal, the method comprising filtering a vector of received symbols with a filter having a complexity less than cubic with respect to a number of subcarriers in order to derive a vector of estimated symbols;
wherein said filter is implemented by approximating an inverse matrix R −1 .
14. The method according to claim 13 , wherein the reduced complexity filter implements a multiplication of an approximation of the inverse matrix R −1 with the vector of received symbols.
15. The method according to claim 14 , wherein the approximation of the inverse matrix R −1 is a first order approximation.