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Wireless communication apparatus, mobile terminal and wireless communication method

A wireless communication device and wireless communication technology, applied in wireless communication, multiplexing communication, transmission path separation device, etc., capable of solving problems such as low-cost terminal barriers

Active Publication Date: 2008-01-09
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the transmitting side can perform digital / analog conversion and suppress the frequency band and current consumption of the power amplifier independently, but the receiving side needs to increase the sensitivity to remove adjacent channel interference in order to extract a specific frequency band from closely allocated subcarriers. Standard requirements such as filtering, analog / digital conversion and sampling clock, etc., may hinder the provision of low-cost terminals

Method used

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  • Wireless communication apparatus, mobile terminal and wireless communication method
  • Wireless communication apparatus, mobile terminal and wireless communication method
  • Wireless communication apparatus, mobile terminal and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0071] FIG. 4 is a block diagram showing a schematic configuration of a base station related to the first embodiment. The wireless signal received by the antenna unit 1 is converted from the wireless signal into an electric signal by the high-frequency circuit and the analog processing unit 2 , and FFT (Fast Fourier Transform: Fast Fourier Transform) is performed by the FFT unit 3 . Next, in the equalization unit (equalization unit) 4 , the reception waveform deteriorated by multipath delay distortion and the like is calibrated, and in the subcarrier demodulation unit 5 , demodulation is performed for each subcarrier.

[0072] Next, the terminal reception quality information processing unit 6 analyzes the reception quality information received from each terminal. That is, in the limited-band terminal as described above, only in the limited-band portion, it is possible to once measure reception quality information such as a channel with a better reception status than the downli...

no. 2 Embodiment approach

[0090] Fig. 10 is a diagram showing an example of channel arrangement for DL ​​in the related OFDM communication system according to the second embodiment. The base station recognizes that the channel is assigned to the channel terminal, and sets the magnitude of the transmission power to zero for all subcarriers of the channel adjacent to the terminal's reception frequency band. That is, it is equivalent to extending the corresponding subcarriers to all frequency channels and not allocating power. This is performed after other users are always allocated to adjacent channels in the first embodiment, whereas the second embodiment is different in that other users are not allocated to adjacent channels from the beginning.

[0091] For example, in FIG. 10 , the number of channels that can be handled is limited to 1 channel (1SC) in two adjacent channels within the receivable range of a limited-band terminal, and all subcarriers have transmission power levels of zero. Likewise, in...

no. 3 Embodiment approach

[0093] Fig. 11 is a diagram showing an example of a communication frame in the related OFDM communication system according to the third embodiment. In the first and second embodiments, the allocation on the frequency axis has basically been described. However, the allocation of channels for each communication partner basically uses a period determined by a plurality of symbols with a certain duration as a time channel, and uses a unit called a communication frame composed of multiple time channels and multiple channels. method to proceed. That is, in the method of allocating the most appropriate time slot to each communication partner in the communication time slot determined from one frame by the time channel and frequency channel, the present invention is applied to the allocation in units of the communication frame after that instruction of. The communication frame is numbered by using 10 frequency channels as channels and 10 time slots as time channels as one frame. In ...

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Abstract

To achieve a wireless communication even with the other end of communication that is a limited-band terminal capable of receiving only limited frequencies. [MEANS FOR SOLVING PROBLEMS] There are included a frequency channel assigning part (10) for assigning frequency channels; a terminal reception quality information processing part (6) for calculating a required transmission power and an optimum modulation rate for each of subcarriers; a subcarrier power control part (12) for controlling the transmission power level for each of the subcarriers; and a determining part (10) for determining the reception bandwidth of the other end of communication and further determining whether the other end of communication is an all-band terminal capable of receiving all of the frequency channels within a system band or a limited-band terminal capable of receiving only limited frequencies. If the other end of communication is a limited-band terminal, then the transmission power of all or part of the subcarriers is reduced for frequency channels that are adjacent to the reception band assigned to the other end of communication and that are to be assigned to different other ends of communication.

Description

technical field [0001] The present invention relates to a wireless communication device, a portable terminal, and a wireless communication device that perform wireless communication by using a multi-carrier transmission method that divides a plurality of subcarriers allocated continuously at equal frequency intervals in a system frequency band into groups of a certain number. method. Background technique [0002] In recent years, with the rapid penetration of wired broadband services such as ADSL and FTTH into ordinary households, so-called rich content services (rich contents services) using audio, video, and music have become more and more popular. The amount of information processed by individuals is also increasing. The rate of use of non-voice call services such as portable Web and music delivery in mobile communications is rapidly expanding, and expectations for broadband wireless communications equivalent to wired communications are rising. [0003] Various studies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04J1/02H04W4/24H04W72/54
CPCH04L5/0064H04W52/42H04L5/006H04L5/0007H04L5/0046H04W72/048H04W52/346H04W52/247H04L5/0037H04W52/16H04W72/085H04W52/0212Y02D30/70H04W72/51H04W72/542H04W72/21H04J1/00H04L5/0066H04W72/0473H04W88/02H04W88/08
Inventor 柏木宏贵浜口泰弘
Owner SHARP KK
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