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Radio communication apparatus and peak suppressing method

A wireless communication device and peak technology, which is applied in multiplexing communication, modulated carrier system, signaling feature, etc., can solve the problems of peak signal generation, deterioration of transmission characteristics of transmitted signals, nonlinear distortion of transmitted signals, etc. , to achieve the effect of reducing the peak-to-average ratio

Inactive Publication Date: 2006-10-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When peak clipping is performed, the transmission signal will generate nonlinear distortion, resulting in deterioration of the transmission characteristics of the transmission signal
In addition, excess radiation outside the frequency band will also be generated. Although it needs to be removed by a band-limiting filter, when passing through the band-limiting filter, the signal may generate peaks again.
Furthermore, it is well known that the influence of peak clipping in the prior art on transmission characteristics is different for each subcarrier on the peak power

Method used

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  • Radio communication apparatus and peak suppressing method
  • Radio communication apparatus and peak suppressing method
  • Radio communication apparatus and peak suppressing method

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Experimental program
Comparison scheme
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Embodiment approach 1

[0035] figure 1 is a block diagram showing the configuration of wireless communication device 100 according to Embodiment 1 of the present invention.

[0036] Coding sections 101-1 to 101-n encode the input data at a coding rate specified for each subcarrier based on the control from MCS setting section 116, and output the data to modulation sections 102-1 to 102-1 for each subcarrier. 102-n.

[0037] Modulation sections 102-1 to 102-n modulate the input data of each subcarrier input from coding sections 101-1 to 101-n with a predetermined modulation scheme based on the control from MCS setting section 116, and output the data to buffer unit 103.

[0038] The buffer unit 103 outputs the input data input by the modulation units 102-1 to 102-n to the switching unit 104, and temporarily stores the input data input by the modulation units 102-1 to 102-n, and transfers the stored input data at a specified time. The data is output to the signal restoration unit 115 .

[0039] Sw...

Embodiment approach 2

[0079] Figure 10 It is a block diagram showing the configuration of wireless communication device 1000 according to Embodiment 2 of the present invention.

[0080] The configuration of wireless communication device 1000 according to Embodiment 2 is that figure 1 In the shown wireless communication device 100 according to Embodiment 1, as Figure 10 As shown, the peak elimination unit 107, the BPF unit 108 and the signal restoration unit 115 are removed, and a puncture unit 1001 and a peak suppression signal insertion unit 1002 are added. In addition, in Figure 10 in with figure 1 Units with the same structure are marked with the same numbers, and their descriptions are omitted here.

[0081] The puncturing unit 1001 assigns a part of the subcarriers (low transmission rate subcarriers) set to indicate a low bit transmission rate MCS of a level lower than a predetermined threshold value (third threshold value) based on the MCS information input from the MCS setting unit 11...

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Abstract

A wireless communication device that can reduce the peak-to-average ratio without reducing transmission efficiency. In this device, the buffer unit (103) temporarily stores input data before peak suppression. The peak detection unit (106) detects peaks whose amplitude level is greater than or equal to the threshold. The peak elimination unit (107) suppresses the detected peak to a threshold. The switching unit (109) outputs the peak-suppressed signal to the FFT unit (114) when a peak is detected, and switches when no peak is detected so that the peak-suppressed signal is sent for processing. The signal repair unit 115 removes the signal assigned to the subcarrier with MCS set to high level based on the MCS information, and assigns the signal before peak suppression stored in the buffer unit (103) to the subcarrier instead. . The MCS setting unit (116) selects the MCS based on the reception quality information of the communication partner.

Description

technical field [0001] The present invention relates to a wireless communication device and a peak suppression method thereof, in particular to a wireless communication device that transmits transmission data using a plurality of subcarriers and a peak suppression method thereof. Background technique [0002] The subcarrier transmission method is a technology that transmits data using multiple carriers (subcarriers) that suppress the transmission speed without causing frequency-selective fading, improves transmission efficiency, and ultimately enables high-speed transmission. Especially in the OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) modulation mode, multiple subcarriers configuring data are orthogonal to each other, so it is the mode with the highest frequency utilization rate among the multi-carrier transmission modes. Therefore, the OFDM scheme and the OFDM-CDMA scheme in which the CDMA (Code Division Multiple Access, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/26
CPCH04L27/2624H04L1/0026
Inventor 蛯子惠介上杉充
Owner PANASONIC CORP