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Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence

A technology of pilot symbols and pilot sequences, which is applied in the field of OFDM communication, can solve the problems of reducing spectrum utilization and large amount of calculation, and achieves the effect of low complexity and peak-to-average ratio

Inactive Publication Date: 2005-01-19
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

It can be seen that the calculation amount of these two methods is particularly large, and additional information needs to be transmitted, which will reduce the spectrum utilization

Method used

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  • Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence
  • Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence
  • Method and apparatus for reducing peak-to-average ratio of OFDM system using pilot frequency symbol sequence

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Embodiment Construction

[0026] The present invention utilizes the method of pilot symbol sequence to reduce the peak-to-average ratio of OFDM system, first changes the polarity and power of the original pilot sequence in OFDM symbols, and obtains a group of all possible sequences; secondly, for this Each sequence in the group sequence is subjected to inverse Fourier transform (IDFT); then, the coded and interleaved data sequence is also subjected to inverse Fourier transform, and the calculation result is combined with a set of sequences obtained after the previous pilot transformation Each sequence in is added to get another set of sequences. Finally, the peak-to-average ratio of each sequence in this group of sequences is calculated separately, and the sequence corresponding to the smallest peak-to-average ratio is selected as the emission sequence. Changing the polarity and power of the original pilot sequence in the OFDM symbol is to allow each pilot to take two values ​​of +1 or -1, so that a se...

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Abstract

The invention is a method of using guide frequency character sequence to reduce peak average ratio in orthogonal frequency division multiplex (OFDM) system, including the steps: changing the polarity and power of original guide frequency in OFDM character sequence to obtain a group of all possible sequences; making Fourier transform on each sequence in the group; making Fourier transform on coded and interlaced data sequences and adding the calculation result to each sequence in a group of sequences obtained after guide frequency transform so as to obtain the other group of sequences; calculating the peak average ratio of each sequence in the new group, selecting out a sequence corresponding to the minimum peak average ratio to act as an emission sequence. By changing the polarity and emission power of guide frequency sequence in the OFDM system, it adopts low complexity, high efficiency algorithm and reduces the peak average ratio of the OFDM system on the premise of not needing to transmit added information and not increasing the complexity of receiver.

Description

technical field [0001] The present invention relates to the technical field of Orthogonal Frequency Division Multiplexing (OFDM) communication, specifically, the present invention mainly relates to a method and a device for reducing peak-to-average ratio in an OFDM communication system. Background technique [0002] Due to its high spectral efficiency and the convenience of providing higher data rates, Orthogonal Frequency Division Multiplexing (OFDM) technology has become the mainstream technology of the next generation communication system. However, this technique has an inherent disadvantage of a high peak-to-average ratio. Peak-to-average ratio (abbreviated as PAPR) refers to the ratio of peak power to average power. To avoid distortion and spectral spread, a high peak-to-average ratio requires a transmit amplifier with a large linear range and high output power. In order to solve this problem, there are currently many methods. [0003] These methods can be divided in...

Claims

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Application Information

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IPC IPC(8): H04B1/69H04J11/00H04L27/34
Inventor 许昌龙王海王家城周潘渝
Owner BEIJING SAMSUNG TELECOM R&D CENT
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