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Method of reducing peak even ratio of orthoganal frequency division complexing signals

A technology of multiplexing signals and orthogonal frequency division, which is applied in the field of reducing the peak-to-average ratio of orthogonal frequency division multiplexing signals, and can solve problems such as reducing transmission efficiency and demodulation errors

Inactive Publication Date: 2007-02-21
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, the existing method needs to send side information to the receiver, which reduces the transmission efficiency on the one hand, and needs to receive the side information reliably on the other hand, otherwise, demodulation errors will occur

Method used

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  • Method of reducing peak even ratio of orthoganal frequency division complexing signals
  • Method of reducing peak even ratio of orthoganal frequency division complexing signals
  • Method of reducing peak even ratio of orthoganal frequency division complexing signals

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no. 1 example

[0073] figure 2 A schematic diagram of the pilot and data of the present invention is shown. A certain OFDM symbol (N points) is used as a pilot for channel estimation, followed by data (M points). The channel is considered to be invariant (M>=N) in N+M points. This is done because in a slow fading environment, the channel changes slowly and can be considered as constant for a long period of time.

[0074] In this way, one data symbol of OFDM can be lengthened (M points). When estimating the channel, if the length of the channel is within a certain range, a smaller symbol (N points) can be used to estimate the time domain response of the channel.

[0075] image 3 A flowchart showing the operations performed at the sending end in the first embodiment of the present invention. In the first embodiment, the frequency domain defining the basic pilot is denoted as s 1 , s 2 , s 3 , s 4 , the time domain representation of the basic pilot is a 1 、a 2 、a 3 、a 4 . Predet...

no. 2 example

[0097] Figure 7 A flowchart showing the operations performed at the sending end in the second embodiment of the present invention. The difference between the method of the second embodiment and the first embodiment is that a part of the frequency domain pilot is used as a PTS weighted sequence.

[0098] As mentioned above, in the process of channel estimation, if the performance of LS estimation of the channel is to be the best, the S matrix in formula (3) must be an orthogonal matrix, that is, the pilots in the domain are shifted and orthogonal. However, for block pilots that meet the above conditions, it is required that the frequency domain pilots be of equal power. Assuming that the power of the frequency-domain pilot symbol is 1, the frequency-domain pilot can be e jθ (θ is any value from 0 to 2π), so that the above requirements can be met. Therefore, a part of the frequency domain representation of the pilot sequence can be used as a PTS weighted sequence.

[0099] ...

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Abstract

The method comprises: a) according to the preset sequence, saving multi weighted sequences; b) the data vector in OFDM (orthogonal frequency division multiplexing) signals is divided into multi subvectors; c) selecting one weighted sequence from said multi weighted sequences in order to make peak value of the signals formed by the combination of the weighted sequence and said multi subvectors to be least; d) according to the location of the weighted sequence selected in multi weighted sequences, shifting the pilot frequency in OFDM signals.

Description

technical field [0001] The invention relates to a method for reducing the peak-to-average ratio (PAPR) of an Orthogonal Frequency Division Multiplexing (OFDM) signal and a corresponding method for recovering data, which can improve the efficiency of information transmission while reducing the PAPR. Background technique [0002] Orthogonal frequency division multiplexing is an efficient data transmission method. Its basic idea is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and each sub-carrier is parallel transmission. In this way, although the overall channel is non-flat and has frequency selectivity, each sub-channel is relatively flat, and narrowband transmission is performed on each sub-channel, and the signal bandwidth is smaller than the corresponding bandwidth of the channel, so the signal waveform can be greatly eliminated. Interference between. [0003] The difference bet...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/261H04L27/2614
Inventor 吴强李继峰
Owner PANASONIC CORP
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