Method for reducing the crest factor of a signal

• US 6,529,925 B1
• Filed: 11/03/1999
• Issued: 03/04/2003
• Est. Priority Date: 11/03/1998
• Status: Expired due to Term

• Current Assignee: Infineon Technologies AG
• Original Assignee: Siemens AG
• Inventors: Schenk, Heinrich
• Primary Examiner(s): Mai, Tan V.
• Application Number:
  US09/433,384
• Time in Patent Office: 1,217 Days
• Field of Search: 708/300, 708/445, 708/819, 708/5, 708/403-404, 708/270, 375/285, 375/296, 370/203
• US Class Current: 708/300
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only

Abstract

A method for reducing the crest factor of a signal, the signal being represented by a digital signal vector whose elements are sampled values of the signal. The method includes the steps of calculating a digital correction vector from the elements of the digital signal vector. Adding the digital correction vector and to the digital signal vector, and outputting a corrected digital signal vector.

Claims

1. A method for reducing a crest factor of signals, which comprises:

generating a digital signal vector having elements y_k being sampled values of a signal and representing the signal in a time domain;

calculating a digital correction vector from the elements of the digital signal vector;

calculating elements Δ

y_1k of the digital correction vector from a maximum (max) element and a minimum (min) element of the elements y_k of the digital signal vector as follows;

2. The method according to claim 1, which comprises expanding the corrected digital signal vector by M elements, the M elements being elements of the corrected digital signal vector.

3. The method according to claim 1, which comprises carrying out the adding step of adding the digital correction vector and the digital signal vector only if at least one of the elements y_k of the digital signal vector exceeds a prescribable threshold value.

4. The method according to claim 1, which comprises carrying out the adding step of adding the digital correction vector and the digital signal vector only if at least one of the elements y_k of the digital signal vector falls below a prescribable threshold value.

5. The method according to claim 1, which comprises generating the signal represented by the digital signal vector using a multi-carrier method.

6. The method according to claim 5, which comprises generating the signal represented by the digital signal vector using discrete multi-tone modulation.

7. A method for reducing a crest factor of signals, which comprises:

generating a digital signal vector having elements y_k being sampled values of a signal and representing the signal in a time domain;

calculating a digital correction vector from the elements of the digital signal vector;

calculating elements Δ

y_2k of the digital correction vector from a maximum (max) element and a minimum (min) element of the elements y_k of the digital signal vector as follows;