Apparatus and method for estimating a clipping parameter of an ofdm system
OwnerWen-Rong Wu, Chuntao Lininventors
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Abstract
An apparatus and a method for estimating a clipping parameter of an OFDM system are disclosed. The apparatus includes a clipping error detection module for evaluating a received clipping error; a division module coupled to the clipping error detection module for obtaining a characteristic value according to the received clipping error; and a computation module coupled to the division module for estimating the clipping parameter according to the characteristic value.
Claims18
A method utilized in an orthogonal frequency division multiplexing (OFDM) receiver for estimating a clipping parameter corresponding to an OFDM time domain signal, wherein the receiver receives the OFDM time domain signal and converts the OFDM time domain signal to an OFDM frequency domain signal consisting of a plurality of sub-carrier signals, the method comprising:
- (a) detecting a clipping error corresponding to a sub-carrier according to a difference between a sub-carrier signal corresponding to the sub-carrier and a frequency domain decision signal;
- (b) obtaining a characteristic value corresponding to the sub-carrier by dividing a power value of the clipping error corresponding to the sub-carrier by a power value of the frequency domain decision signal;
- and
- (c) obtaining a clipping parameter according to an average characteristic value, wherein the average characteristic value is an average of at least one characteristic value respectively corresponding to one sub-carrier.
An apparatus utilized in an orthogonal frequency division multiplexing (OFDM) receiver for estimating a clipping parameter corresponding to an OFDM time domain signal, wherein the receiver receives the OFDM time domain signal and converts the OFDM time domain signal to an OFDM frequency domain signal consisting of a plurality of sub-carrier signals, the apparatus comprising:
- a clipping error detection module for evaluating a clipping error corresponding to the sub-carrier according to a difference between a sub-carrier signal corresponding to the sub-carrier and a frequency domain decision signal;
- a division module coupled to the clipping error detection module for obtaining a characteristic value corresponding to the sub-carrier by dividing a power value of the clipping error corresponding to the sub-carrier by a power value of the frequency domain decision signal;
- and
- a computation module coupled to the division module for estimating a clipping parameter according to an average characteristic value, wherein the average characteristic value is an average of at least one characteristic value respectively corresponding to one sub-carrier.
Dependencies are inferred from the claim text.