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Method for reducing peak-to-average ratio in OFDM system and access device

An orthogonal frequency division and peak-to-average ratio technology, applied in the field of methods and access devices, can solve the problems of large amount of calculation and large number of pilot candidate combinations

Inactive Publication Date: 2014-11-12
GLOBAL INNOVATION AGGREGATORS LLC
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Problems solved by technology

The disadvantage of this scheme is that due to the large number of pilot candidate combinations, it is necessary to traverse all the pilot signals in the set, and the amount of calculation is large

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  • Method for reducing peak-to-average ratio in OFDM system and access device
  • Method for reducing peak-to-average ratio in OFDM system and access device
  • Method for reducing peak-to-average ratio in OFDM system and access device

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0036] Such as figure 1 As shown, the embodiment of the present invention provides a method to achieve the above object, the first aspect of the present invention provides a method for reducing peak-to-average ratio in an OFDM system, and the execution subject of the method may be a wireless local area network The access point (Access Point, AP) used for the user equipment in the wireless local area network may also be a handheld terminal that can access the wireless local area network in the wireless local area network, and the method includes:

[0037] Step 1, performing inverse fast Fourier transform on the frequency-domain symbol signal to be sent to obtain the first time-domain signal sequence;

[0038]Specifically, corresponding to the data to be sent by the access point or the access terminal in the OFDM system...

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Abstract

The present invention relates to a method for reducing the peak-to-average ratio in an OFDM system. The method comprises the steps of: step 1, rapid inverse Fourier transforming a modulation signal that needs to be transmitted, acquiring a first time-domain signal collection; step 2, searching in the first time-domain signal collection for multiple time-domain signals of powers that satisfy a threshold and time-domain positions of the time-domain signals when at maximum power; step 3, transmitting a frequency-domain auxiliary signal in a determined subcarrier, and reversely adjusting second time-domain signals of the auxiliary signal at the time-domain positions of first time-domain signals when at maximum power, where the first time-domain signals are the time-domain signals of the greatest power among the multiple time-domain signals; and, step 4, adding the adjusted second time-domain signals of the auxiliary signal to the multiple first time-domain signals to reduce the peak-to-average ratio of the modulation signal. The method allows for implementation of a reduction in the peak-to-average ratio of the modulation signal in the OFDM system insofar that power consumption and the amount of computations are reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and an access device for reducing peak-to-average ratio in an orthogonal frequency division multiplexing system. Background technique [0002] Wireless local area network (Wireless Local Area Network, WLAN) technology has the advantage of high-speed access, and is widely used in the field of mobile network access. In WLAN technology, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology, but due to PFDM peak-to-average power ratio (Peak to Average Power Ratio, PAPR) is relatively large, the power amplifier (power amplifier , PA) has an impact on the linearity requirement, so PAPR reduction for WLAN OFDM systems is required. [0003] In the prior art, one method for reducing the PAPR is to adopt a remapping method. By performing an exhaustive search on any combination of bits corresponding to each symbol in the transmitted sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/005
CPCH04L27/2618
Inventor 王力
Owner GLOBAL INNOVATION AGGREGATORS LLC
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