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Transmitter, receiver, and method of data transmission

A technology of sending device and receiving device, which is applied in the direction of digital transmission system, transmission system, radio transmission system, etc., and can solve the problems such as the decrease of frequency utilization efficiency

Inactive Publication Date: 2002-08-14
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the mobile communication system using the conventional OFDM modulation method, since the guard bands 52 and 53 are used for signal transmission, there is a problem that the frequency utilization efficiency decreases due to this part.
[0011] In addition, in the OFDM modulation method, there is a problem that the amplitude (peak value) at the time when the same carrier signal overlaps is larger than the average power. As a countermeasure, in the existing mobile communication system, a small number of carriers are assigned to suppress the peak value
However, if the carrier used for peak suppression is set, there is still the problem that the frequency utilization efficiency decreases

Method used

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  • Transmitter, receiver, and method of data transmission
  • Transmitter, receiver, and method of data transmission
  • Transmitter, receiver, and method of data transmission

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Embodiment 1

[0026] Fig. 3 is a block diagram showing the structures of a transmitting device and a receiving device according to Embodiment 1 of the present invention. The transmitting device and receiving device shown in FIG. 3 are installed in a base station device and a communication terminal device of a mobile communication system using the OFDM modulation method, respectively. In this embodiment, wireless communication between a transmitting device mounted on a base station device and a receiving device mounted on a communication terminal device will be described.

[0027] The transmitting device 100 mainly includes an S / P converting unit 101 , an IFFT unit 102 , a spreading unit 103 , a band limiting filter unit 104 , an adding unit 105 , and a modulating unit 106 .

[0028] The S / P conversion unit 101 converts serial transmission data into N (N is a natural number) subcarriers in parallel. The IFFT unit 102 performs inverse Fourier transform on N (N is a natural number) subcarrier...

Embodiment 2

[0046] Figure 5 A block diagram showing the structures of a transmitting device and a receiving device according to Embodiment 2 of the present invention. exist Figure 5 In the transmission device and reception device shown, the same components as those in FIG. 3 are given the same reference numerals as those in FIG. 3 and their explanations are omitted.

[0047] Figure 5 The transmission device 300 shown has a configuration in which a spectrum processing unit 301 is added to the transmission device 100 shown in FIG. 3 .

[0048] The spectrum processing unit 301 processes the spectrum of the band-limited signal output from the band-limiting filter unit 104 to increase the portion close to the signal transmission band (hereinafter referred to as "spectrum coloring").

[0049] The adder 105 adds the OFDM modulated signal spectrally colored by the spectrum processing unit 301 and the band-limited signal output from the band-limited filter unit 104 .

[0050] Figure 5 The...

Embodiment 3

[0055] Figure 7 A block diagram showing the structures of a transmitting device and a receiving device according to Embodiment 3 of the present invention. exist Figure 7 In the transmission device and reception device shown, the same components as those in FIG. 3 are given the same reference numerals as those in FIG. 3 and their explanations are omitted.

[0056] Figure 7 The transmission device 500 shown has a configuration in which an S / P conversion unit 501 and a plurality of frequency shift units 502 are added to the transmission device 100 shown in FIG.

[0057] The S / P conversion unit 501 performs parallel conversion on the forecast information. Spreading units 103-1 to 103-n (n is a natural number greater than or equal to 2) multiply each piece of forecast information after parallel conversion by a spreading code. Each band limiting filter unit 104-1 to 104-n limits the frequency band of the forecast information output from the corresponding spreading unit 103-1 ...

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PUM

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Abstract

A transmitting apparatus 100 spreads broadcast information by means of a spreading section 103, limits the band of spread broadcast information by means of a band limiting filter section 104 so as not to overlap a guard frequency band, adds the output signal of a band limiting filter section 104 to transmit data after an inverse Fourier transform by means of an adding section 105, modulates the resulting signal by means of a modulation section 106, and transmits it. A receiving apparatus 150 passes only a signal in a guard frequency band by means of a reception filter section 154, demodulates it by means of a demodulation section 155, despreads it by means of a despreading section 156, and performs rake reception by means of a rake reception section 157 to obtain broadcast information. By this means, guard frequency bands can be used efficiently, and spectrum efficiency can be improved.

Description

technical field [0001] The present invention relates to a transmission device, a reception device, and a data transmission method used in a communication terminal device and a base station device of a mobile communication system using an OFDM (Orthogonal Frequency Division Multiple) modulation method. Background technique [0002] The technology related to the mobile communication system of the conventional OFDM modulation method is disclosed in JP-A-11-17643 and the like. [0003] figure 1 A block diagram showing the structure of a conventional transmitting device and receiving device. figure 1 The transmitting device and the receiving device are installed in the base station device and the communication terminal device of the mobile communication system of the OFDM modulation method, respectively. [0004] The transmission device 10 is mainly composed of an S / P (Serial / Parallel: serial / parallel) conversion unit 11 , an IFFT (Inverse Fast Fourier Tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B7/26H04H1/00H04L5/02H04L5/06H04W52/34H04W52/42H04W72/04
CPCH04L5/023H04L5/06H04B1/707H04B7/00
Inventor 上杉充
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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