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Transmitting device and transmitting method

A technology of a sending device and a sending method, which is applied in channel estimation, communication between multiple stations, and modulated carrier system, etc., and can solve problems such as inability to fully track line error rate characteristics, deterioration, etc.

Inactive Publication Date: 2001-11-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when the channel fluctuates quickly due to high-speed fading, there is a problem that the channel estimation of the adaptive equalizer cannot sufficiently follow the channel fluctuation, and the error rate characteristic is deteriorated.

Method used

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  • Transmitting device and transmitting method
  • Transmitting device and transmitting method
  • Transmitting device and transmitting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] figure 1 A block diagram showing the structures of the transmitting device and the receiving device according to Embodiment 1 of the present invention.

[0021] 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 symbol rate determination unit 102 . As a method of estimating channel fluctuations, there is a method of measuring the reception level of a signal received by a receiving device (not shown) mounted on a base station device or the like together with the transmitting device 100, and based on the measurement result. estimate.

[0022] The symbol rate determination unit 102 determines the symbol rate based on the estimated channel variation. Then, the symbol rate determination unit 102 outputs a signal indicating the determined symbol rate to the framing unit 103 , the b...

Embodiment 2

[0041] Figure 4 A block diagram showing the structures of a transmitting device and a receiving device according to Embodiment 2 of the present invention. Among them, in Figure 4 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.

[0042] exist Figure 4 in, compared to figure 1 Specifically, the transmission device 100 adopts a configuration in which the channel fluctuation estimation unit 101 and the symbol rate determination unit 102 are removed, and the demodulation unit 401 and the symbol rate extraction unit 402 are added. Additionally, compared to figure 1 In other words, the reception device 200 adopts a configuration in which the symbol rate detection unit 203 is removed, and the channel estimation fluctuation estimation unit 301 , the symbol rate determination unit 302 , and the modulation unit 303 are added. exist ...

Embodiment 3

[0048] In Embodiments 1 and 2, the case where the symbol rate determining unit 102 or the symbol rate determining unit 302 determines the symbol rate of the transmission data based only on the amount of channel variation has been described.

[0049] However, even for the same delayed wave, the number of delayed symbols becomes relatively larger after the symbol rate is increased. The number of delayed symbols that can be equalized by the adaptive equalizer is determined by the number of taps of the adaptive equalizer. Therefore, when the symbol rate is continuously increased In some cases, there is a delay wave exceeding the possible range, which causes a problem that the performance of the adaptive equalizer deteriorates.

[0050] For example, a delayed wave of 1 μs existing in a wireless line is delayed by one symbol when the symbol rate is 1 Msps, and is delayed by two symbols when the symbol rate is 2 Msps.

[0051] In the case where the adaptive equalizer is 5 taps, equal...

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Abstract

A line variation estimating section (101) estimates the variation of the line between a transmitting device (100) and a receiving device (200). A symbol rate determining section (102) determines the symbol rate on the basis of the variation of the line to transmit a signal at an increased symbol rate if the line variation is significantly fast because of fast phasing to make relatively minute the line variation between symbols or in a burst. Thus even if the line variation is significantly fast because of fast phasing, an adaptive equalizer can have a sufficient follow-up performance almost without increasing the device structure, maintaining the favorable communication quality.

Description

technical field [0001] The present invention relates to a transmitting device and a transmitting method used in a mobile communication system. Background technique [0002] In a mobile communication system, the amplitude and phase of a signal received by a receiver fluctuate drastically due to reflection and diffraction of multiple transmission waves reaching the receiver or movement of the receiver itself. [0003] In a mobile communication system, in order to maintain good communication quality, it is necessary to compensate the amplitude and phase fluctuations of the received signal in the receiver. In addition, it is necessary to perform the same compensation when processing such as synchronous detection and delayed wave detection. [0004] As a method of compensating the amplitude and phase changes of the received signal, the general method is to estimate the amplitude and phase changes of the line by an adaptive equalizer, and adaptively shape the waveform of the rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/74H04B7/26H04L1/00H04L1/20H04L25/02
CPCH04L1/0002H04L25/0202H04L1/20H04B7/26
Inventor 北川惠一上杉充齐藤佳子
Owner PANASONIC CORP
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