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Radio transmitting apparatus and radio transmitting method

A technology for wireless transmission and wireless reception devices, applied in the field of wireless transmission devices, which can solve the problems of being difficult to suffer from frequency selective fading, deterioration of error rate characteristics, and inability to fully track lines, etc.

Inactive Publication Date: 2003-01-29
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, if a multi-carrier modulation method is used, it is less susceptible to frequency selective fading
[0004] However, in the conventional multi-carrier modulation method described above, the symbol period becomes longer, so the phase variation and amplitude variation between symbols are relatively large.
Therefore, when the fluctuation of the wireless channel due to high-speed fading etc. is significantly accelerated, the channel estimation by an adaptive equalizer or the like cannot sufficiently follow the fluctuation of the channel, and there is a problem that the error rate characteristic deteriorates.

Method used

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  • Radio transmitting apparatus and radio transmitting method
  • Radio transmitting apparatus and radio transmitting method
  • Radio transmitting apparatus and radio transmitting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a block diagram showing the structures of the transmitting device and the receiving device according to Embodiment 1 of the present invention.

[0025] exist figure 1 In the transmission device 100 shown, the channel fluctuation estimation unit 101 estimates the channel fluctuation amount between the transmission device 100 and the reception device 200 , and outputs the estimation result to the carrier number determination unit 102 . In addition, as a method of estimating the amount of channel variation, the method of measuring the reception level of a signal received by a receiving device (not shown) mounted in a base station device or the like together with the transmitting device 100, and estimating it based on the measurement result .

[0026] The carrier number determination unit 102 determines the number of carriers used for signal transmission based on the estimated amount of channel variation. In addition, the number-of-carriers determination u...

Embodiment 2

[0050] In the transmission device of this embodiment, in OFDM (Orthogonal Frequency Division Multiplexing; Orthogonal Frequency Division Multiplexing) modulation, the greater the channel variation, the more the number of carriers is reduced to transmit signals.

[0051] Here, OFDM is a multi-carrier modulation method, and is a modulation method in which carriers are in an orthogonal relationship.

[0052] Figure 7 It is a structural block diagram of the transmitting device and the receiving device according to Embodiment 2 of the present invention. Among them, in Figure 7 In the sending device and receiving device shown, pair with figure 1 The same structural part is appended with figure 1 The same reference numerals are used, and descriptions thereof are omitted.

[0053] exist Figure 7 In the transmission device 100 shown, the carrier number determination unit 102 outputs a signal indicating the determined number of carriers to the serial-parallel conversion unit 103...

Embodiment 3

[0062] In this embodiment, the transmitting device does not determine the number of carriers, and the transmitting device transmits data based on the number of carriers determined by the receiving device.

[0063] Figure 8 It is a structural block diagram of a sending device and a receiving device according to Embodiment 3 of the present invention. Among them, in Figure 8 In the sending device and receiving device shown, pair with figure 1 The same structural part is appended with figure 1 The same reference numerals are used, and descriptions thereof are omitted.

[0064] exist Figure 8 In the shown receiving apparatus 200 , the channel fluctuation estimation unit 210 estimates the channel fluctuation amount of the multi-carrier signal, and outputs the estimation result to the carrier number determination unit 211 .

[0065] The carrier number determination unit 211 determines the number of carriers used for signal transmission by the transmission device 100 based on ...

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Abstract

A line fluctuation estimating unit (101) estimates a line fluctuation amount between a transmitting apparatus (100) and a receiving apparatus (200). A carrier number deciding unit (102) decides, based on the line fluctuation amount, the number of carriers to be used in transmitting a signal. That is, if the line fluctuation is significantly fast due to a fast fading or the like, the carrier number deciding unit (102) reduces the carrier number to raise the symbol rate per carrier, thereby relatively reducing the line fluctuation between symbols or within a burst.

Description

technical field [0001] The present invention relates to a wireless transmission device and a wireless transmission method using a multi-carrier modulation method. Background technique [0002] In wireless communication, a receiver simultaneously receives a signal (delayed wave) reflected by an obstacle in addition to a signal directly arriving from a transmitter (direct wave). Therefore, frequency selective fading occurs due to multipath, deteriorating reception quality. [0003] In contrast, in the multi-carrier modulation method, after the transmission data sequence is divided into N data by serial-to-parallel conversion, each data is modulated by carriers of different frequencies. In this way, in the multi-carrier modulation scheme, transmission data is allocated to multiple carriers with different frequencies for transmission, so even if frequency selective fading due to multipath occurs, the probability of losing all data can be reduced. That ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J1/00H04B1/04H04B7/26H04J11/00H04L27/26H04W16/02H04W72/04
CPCH04L5/0007H04L27/2637H04L5/006H04L5/0046H04L27/2653
Inventor 北川惠一上杉充
Owner PANASONIC CORP
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