Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Wireless transmission apparatus and peak power suppressing method in multicarrier transmission

A technology of wireless transmission and peak power, applied in multiplexing communication, modulated carrier system, multi-frequency code system, etc., can solve problems such as deterioration, signal distortion, and high peak power, and prevent the decline of transmission efficiency and reduce Effect of peak power and throughput reduction prevention

Inactive Publication Date: 2006-12-27
PANASONIC CORP
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in multi-carrier communication using multiple sub-carriers, when the phases of the sub-carriers are aligned, the peak power becomes very large with respect to the average power
When the peak power increases, the signal is distorted due to the limitation of the linear amplifier, thereby deteriorating the transmission characteristics (for example, BER: Bit Error Rate, bit error rate)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wireless transmission apparatus and peak power suppressing method in multicarrier transmission
  • Wireless transmission apparatus and peak power suppressing method in multicarrier transmission
  • Wireless transmission apparatus and peak power suppressing method in multicarrier transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] figure 1 is a block diagram showing the configuration of the radio transmission apparatus according to Embodiment 1 of the present invention. figure 1 The shown wireless transmission device includes: a coding unit 11, a modulating unit 12, an allocating unit 13, a subcarrier selecting unit 14, a changing unit 15, an inverse fast Fourier transform (IFFT) unit 16, a judging unit 17, a guard interval ( GI) unit 18 , wireless transmission unit 19 and antenna 20 .

[0042] The coding unit 11 performs error correction coding on the transmission data (bit string).

[0043] The modulation unit 12 modulates data by generating symbols from encoded data and arranging the generated symbols at any one of a plurality of signal points on the I-Q plane. The multiple signal points on the I-Q plane depend on the modulation scheme used by the modulation unit 12 . Details will be described later.

[0044] Distributing unit 13 converts the modulated symbols serially input from modulatin...

example 1

[0061] Variation 1, in such as Figure 7 Change the phase and amplitude of the subcarrier within the range shown. Specifically, the changing unit 15 converts a shown in the following formula (1) k The subcarrier selected by the subcarrier selection unit 14 is multiplied.

[0062] 【Formula 1】

[0063] a k =p·e jθ ...(1)

[0064] Wherein, p is a variable 0<p<1 for changing the amplitude, and θ is a variable π / 4<θ<π / 4 for changing the phase, both of which are random variables for each subcarrier. Also, k is 1, 2..., N (N is the total number of subcarriers included in one OFDM symbol). In this way, when θ is randomly changed to change the phase of each subcarrier, the phases of each subcarrier can be made out of synchronization, and as a result, the peak power of the OFDM symbol can be suppressed. In addition, since p is 0<p<1, the change range is the range inside the amplitude increase / decrease boundary line (a part of a circle with a radius of 1). Compared with the su...

example 4

[0070] Variation 4, in such as Figure 10 Change the phase and amplitude of the subcarrier within the range of variation shown (within the range in which the circle in Variation 3 is changed to an ellipse). In Variation 4, as in Variation 3, since the variation range is larger on the inside than outside of the amplitude increase / decrease boundary, the transmission power of the OFDM symbol decreases in terms of probability.

[0071] (Variation 5)

[0072] Variation 5, in Figure 11 Change the phase of the subcarrier within the range shown (on the boundary line between amplitude increase and decrease). That is, instead of changing the amplitude, only the phase. Specifically, the changing unit 15 converts a shown in the following formula (2) k The subcarrier selected by the subcarrier selection unit 14 is multiplied.

[0073] [Formula 2]

[0074] a k =e jθ ...(2)

[0075]Wherein, θ is π / 4<θ<π / 4, and is a random variable of each subcarrier. In this modification examp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A wireless transmission apparatus wherein peak power can be suppressed without degradation of throughput and that of transmission efficiency in a multicarrier transmission. In the apparatus, an encoding part (11) encodes data to be transmitted. A modifying part (12) modifies the encoded data to produce a symbol. An assigning part (13) assigns the symbol to one of a plurality of subcarriers that will constitute a multicarrier signal. A changing part (15) changes the phases of the plurality of subcarriers within a range that does not exceed a determination boarder line of signal points on the I-Q plane. An IFFT part (16) produces the multicarrier signal by use of a high-speed inverse Fourier transformation.

Description

technical field [0001] The invention relates to a wireless sending device and a peak power suppressing method in multi-carrier communication. Background technique [0002] In mobile communications, there is an increasing demand for high-speed transmission of various media such as audio, video, and data. Therefore, OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and MC-CDMA (Multi Carrier-Code Division Multiple Access, multi-carrier- Code Division Multiple Access) and other multi-carrier communications. [0003] However, in multi-carrier communication using a plurality of subcarriers, when the phases of the subcarriers match, the peak power becomes very large compared to the average power. When the peak power increases, the signal is distorted due to the limitation of the linear amplifier, thereby deteriorating the transmission characteristics (for example, BER: Bit Error Rate, bit error rate). Therefore, in order to avoid the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04J1/00H04J11/00H04L27/26
CPCH04L27/2621
Inventor 西尾昭彦三好宪一吉井勇松元淳志
Owner PANASONIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com