US 2010/0166105 A1 · Transmitter and the Method Therefor

Abstract

A transmitter and the method therefor are provided. The transmitter is applied in an orthogonal frequency division multiplexing (OFDM) based or other multicarrier communication systems. The transmitter uses N sub-carriers. Among the N sub-carriers, L sub-carriers (or tones) are reserved for PAPR reduction. L is less than N. The method includes the following steps. Original frequency domain data symbols are generated and fed into the reserved-tone symbol generation unit. The reserved-tone symbols are generated by using pure frequency domain signal processing. Then the reserved-tone symbols are combined with original data symbols to generate combined PAPR reduction signal. The resultant PAPR reduction signal can be fed into reserved-tone symbol generation unit iteratively to obtain updated reserved-tone symbols. For proper iterations, the original data symbols combined with L frequency domain reserved-tone symbols will result in lower PAPR transmit signal.

Claims14

Dependent claims

A method for reducing a peak-to-average power ratio (PAPR), the method being applied by using N sub-carriers, L sub-carriers of the N sub-carriers being reserved sub-carriers, L being less than N, the method comprising:

receiving a data signal, the envelope power of the data signal having a constant power and a fluctuant power;
generating L reserved sub-carrier symbols of the L sub-carriers located in the reserved sub-carriers;
modifying the L reserved sub-carrier symbols according to the data signal, and generating a to-be-combined signal accordingly;
and
combining the to-be-combined signal into the data signal in frequency domain.

2 more elements

A transmitter, applied in an orthogonal frequency division multiplexing (OFDM) based system, the transmitter using N sub-carriers, L sub-carriers of the N sub-carriers being reserved sub-carriers, L being less than N, the transmitter comprising:

a modulation unit, for outputting a data signal, the envelope power of the data signal having a constant power and a fluctuant power;
a reserved sub-carrier symbol generation unit, for generating L reserved sub-carrier symbols of the L sub-carriers located in the reserved sub-carriers, for modifying the L reserved sub-carrier symbols according to the data signal and generating a to-be-combined signal accordingly;
and
a combination unit, for combining the to-be-combined signal into the data signal in frequency domain.

1 more element

Dependencies are inferred from the claim text.

Transmitter and the Method Therefor

Life of this patent

Transmitter and the Method Therefor

Life of this patent

Abstract

Claims14