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Transmitting apparatus and peak suppressing method

A sending device and peaking technology, which is applied in the direction of electrical components, transmission systems, orthogonal multiplexing systems, etc., can solve the problems of increased power consumption and signal peak power increase, and achieve the effect of improving throughput

Inactive Publication Date: 2006-10-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only increase the size of the amplifier, but also increase the power consumption
Moreover, the peak power of the signal will increase when transmitting, and an amplifier that can maintain linearity over a wide range is required, so an expensive amplifier is required

Method used

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  • Transmitting apparatus and peak suppressing method
  • Transmitting apparatus and peak suppressing method
  • Transmitting apparatus and peak suppressing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] figure 1 A block diagram showing the configuration of the wireless communication device 100 according to the embodiment of the present invention.

[0033] Coding section 101 encodes transmission data at a predetermined coding rate based on the coding rate information input from transmission parameter determining section 123 , and outputs the coded transmission data to modulation section 102 .

[0034] Modulation section 102 modulates the transmission data input from encoding section 101 with a predetermined modulation scheme based on the modulation scheme information input from transmission parameter determination section 123 , and outputs the modulated transmission data to synthesis section 103 .

[0035] Combining unit 103 converts the waveform of the transmission data input from modulating unit 102 into and reverse replicas are synthesized on the frequency axis, and output to a serial-to-parallel (hereinafter referred to as “S / P”) conversion unit 104 .

[0036] S / P...

Embodiment approach 2

[0068] Figure 12 This is a flowchart showing the operation when the wireless communication device performs peak suppression processing. In addition, the wireless communication device according to Embodiment 2 has and figure 1 The same structure, so its description is omitted here.

[0069] Regarding the operation of the peak suppression processing performed by the wireless communication device, use Figure 12 as well as Figure 13 to illustrate.

[0070] First, IFFT section 105 performs IFFT processing on transmission data (step ST1201).

[0071] Next, PAPR calculation unit 109 measures PAPR (step ST1202).

[0072] Next, the peak determination unit 111, such as Figure 4 As shown, based on the threshold information input from the cut-off instructing section 110, it is determined whether or not there is a peak value whose PAPR is equal to or greater than the threshold value (α) (step ST1203).

[0073] When there is a peak with PAPR equal to or greater than the threshold...

Embodiment approach 3

[0084] Figure 14 as well as Figure 15 It is a flowchart showing the operation of the peak suppression process performed by the wireless communication device. In addition, the radio communication device according to Embodiment 3 has and figure 1 The same structure, so its description is omitted here.

[0085] Regarding the operation of the peak suppression processing performed by the wireless communication device, use Figure 14 to illustrate.

[0086] First, IFFT section 105 performs IFFT processing on transmission data (step ST1401).

[0087] Next, PAPR calculation unit 109 measures PAPR (step ST1402).

[0088] Next, the peak determination unit 111, such as Figure 4 As shown, based on the threshold information input from the cut-off instructing section 110, it is determined whether or not there is a peak value whose PAPR is equal to or greater than the threshold α (step ST1403).

[0089] When there is a peak with PAPR equal to or greater than threshold α, FFT sectio...

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Abstract

A transmission device that suppresses peaks by using a part of the communication frequency band, thereby improving the throughput of the entire system. In the device, the modulation unit (102) performs adaptive modulation on the transmitted data. The synthesizing unit (103) synthesizes the waveform of the transmitted data and the reverse replica, and suppresses the peak above the threshold. A peak determination unit (111) determines whether or not there is a peak value equal to or greater than a threshold in the transmission signal. An inverse replica generation unit (112), when there is a peak value above the threshold, generates an inverse replica while extracting the waveform of the peak value above the threshold, and the inverse replica has the inverse of the extracted waveform characteristic. A subband selection unit (114) selects a frequency in which a subcarrier of an MCS with low transmission efficiency is selected, and outputs an inverse replica within the range of the selected frequency to the synthesis unit (103).

Description

technical field [0001] The present invention relates to a transmission device and a peak suppression method, and relates to a transmission device and a peak suppression method when transmitting a transmission signal using, for example, OFDM. Background technique [0002] In the past, multi-carrier communication devices using OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) have a strong ability to resist multipath and fading, and can perform high-quality communications, and have attracted attention as devices that can realize high-speed wireless transmission. . In OFDM communication, since the transmitted data is converted into parallel data and then superimposed on multiple subcarriers for transmission, there is no correlation between each subcarrier. Accordingly, if the phases of the respective subcarriers are superimposed, the OFDM symbol has a very large signal amplitude. Thus, if the phases of the subcarriers overlap, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B1/707
CPCH04B1/707H04B2201/70706H04B2201/70707
Inventor 吉井勇三好宪一程俊西尾昭彦福冈将
Owner PANASONIC CORP