Apparatus and method for cancellation of partially overlapped crosstalk signals
First Claim
1. An apparatus for canceling a crosstalk signal that is generated due to overlapping of a transmit frequency and a receive frequency in a mobile communication system, the apparatus comprising:
- a pre-processor for frequency down-shifting an input signal having the crosstalk signal to a baseband;
a crosstalk signal cancellation module for canceling the crosstalk signal from the input signal by dividing the frequency down-shifted input signal by an interpolation ratio;
a post-processor for converting an output of the crosstalk signal cancellation module into a passband signal; and
an error feedback processor for receiving a residual crosstalk signal generated during a crosstalk signal cancellation process of the crosstalk signal cancellation module from the post-processor, performing a decimation operation, and feeding a result of the decimation operation back to the crosstalk signal cancellation module.
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Abstract
The present invention is related to a partially overlapped single-carrier crosstalk signal cancellation method and an apparatus using the same. For this purpose, the present invention provides a crosstalk canceller including a pre-processor for frequency down-shifting an input signal, a crosstalk signal cancellation module for canceling the crosstalk signal by dividing the input signal by an interpolation ratio, a post-processor for converting an output of the crosstalk signal cancellation modulation into a passband signal, and an error feedback processor for performing a decimation operation on a residual crosstalk signal and feeding backing the decimated residual crosstalk signal to the crosstalk signal cancellation module. In addition, the present invention provides a crosstalk signal cancellation method for performing interpolation and filtering operations by frequency down-shifting an input signal including a crosstalk signal to a baseband and decimating a residual crosstalk signal by frequency-shifting to an original signal frequency. According to the present invention, implementation complexity of the crosstalk signal canceller can be reduced and the crosstalk signal cancellation process can be preformed at a low speed by using the interpolation filter and the decimation filter, thereby achieving reduction of computational complexity.
26 Citations
14 Claims
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1. An apparatus for canceling a crosstalk signal that is generated due to overlapping of a transmit frequency and a receive frequency in a mobile communication system, the apparatus comprising:
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a pre-processor for frequency down-shifting an input signal having the crosstalk signal to a baseband;
a crosstalk signal cancellation module for canceling the crosstalk signal from the input signal by dividing the frequency down-shifted input signal by an interpolation ratio;
a post-processor for converting an output of the crosstalk signal cancellation module into a passband signal; and
an error feedback processor for receiving a residual crosstalk signal generated during a crosstalk signal cancellation process of the crosstalk signal cancellation module from the post-processor, performing a decimation operation, and feeding a result of the decimation operation back to the crosstalk signal cancellation module. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for canceling a crosstalk signal that is generated due to overlapping of a transmit frequency and a receive frequency in a mobile communication system, the method comprising:
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(a) frequency down-shifting an input signal having a crosstalk signal to a baseband;
(b) converting the frequency down-shifted input signal into a passband signal by performing an interpolation operation;
(c) filtering the interpolated signal and frequency-shifting to an original signal frequency; and
(d) decimating a residual crosstalk signal generated during the interpolation and filtering processes, and repeating from step (b). - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification