Radio base station and communication terminal

A wireless base station and communication terminal technology, applied in wireless communication, selection device, multiplex communication, etc., can solve the problems of impossible accurate measurement of delay envelope, reduced spectrum efficiency, insufficient time resolution, etc.

Inactive Publication Date: 2003-12-24
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, because the symbol period increases, the time resolution is not enough, so it is not possible to measure the delay profile accurately
When the guard interval is determined from a delay profile produced with insufficient temporal resolution, there is a danger of setting unnecessary time for the guard interval and reducing spectral efficiency

Method used

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  • Radio base station and communication terminal
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  • Radio base station and communication terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, CDMA is used as an uplink access system, and the base station generates an accurate delay envelope to determine the guard interval.

[0025] figure 2 is a block diagram of the configuration of the radio base station apparatus (hereinafter, abbreviated as BS if necessary) of Embodiment 1 of the present invention.

[0026] Wireless reception section 202 receives an uplink signal transmitted from a communication terminal device (hereinafter, abbreviated as MS if necessary) via antenna 201 . The radio reception section 202 performs predetermined reception processing (eg, frequency down conversion and A / D conversion) on the uplink signal, and outputs the radio reception processed signal to the despreading section 203 .

[0027] The despreading part 203 uses the same spreading code as the MS to despread the wirelessly received and processed signal, and outputs the despreading signal to the demodulation part 204 and the delay profile generation part 205 ....

Embodiment 2

[0047] In this embodiment, the leading part for generating the delay envelope is composed of a CDMA signal, and the data part is composed of an OFDM signal, and the two signals are multiplexed and then sent.

[0048] Figure 6 is a block diagram of the configuration of the BS according to Embodiment 2 of the present invention.

[0049] Wireless receiving section 602 receives an uplink signal transmitted from MS through antenna 601 . The radio reception section 602 performs predetermined reception processing (for example, frequency down conversion and A / D conversion) on the uplink signal, and outputs the radio reception processed signal to the despreading section 603 .

[0050] The despreading section 603 performs despreading on the wireless reception processed signal using the same spreading code as that of the MS, and outputs the despreading signal to the demodulation section 604 . Demodulation section 604 demodulates the despread signal, and outputs received data.

[0051...

Embodiment 3

[0082] This embodiment illustrates the use of information in the MS such as reception quality, Doppler shift, and envelope delay to determine OFDM transmission parameters (guard interval, subcarrier frequency spacing, and number of subcarriers), modulation scheme, and FEC coding rate situation.

[0083] Figure 10 It is a block diagram of the configuration of the BS according to Embodiment 3 of the present invention.

[0084] The radio receiving section 1002 receives an uplink signal transmitted by the MS through the antenna 1001 . Wireless reception section 1002 performs predetermined reception processing (such as down-conversion and A / D conversion) on the uplink signal, and outputs the wireless reception-processed signal to despreading section 1003 .

[0085] The despreading section 1003 performs despreading on the wireless reception processed signal using the same spreading code as that used in the MS, and outputs the despreading signal to the demodulation section 1004, t...

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PUM

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Abstract

A downlink line signal transmitted during a guard interval determined by using a delay profile made accurately with an uplink line CDMA signal is received by an MS, the preamble portion of the downlink line signal is Fourier-transformed, and demodulated. The transmission parameters (guard interval, subcarrier frequency interval, number of subcarriers) contained in the preamble portion are extracted and outputted to a Fourier transform block (303). The data portion is Fourier-transformed according to the extracted transmission parameters by the Fourier transform block (303). The Fourier-transformed signal is demodulated by a demodulating block (304) and outputted as reception data. Thus, the delay profile used for determining the guard interval can be accurately made. Therefore the transmission quality is ensured, and the frequency use efficiency is improved.

Description

technical field [0001] The present invention relates to a wireless base station device and a communication terminal device in a digital wireless communication system. Background technique [0002] In recent years, OFDM (Orthogonal Frequency Division Multiplexing) transmission system has attracted a lot of attention. This system can effectively resist multipath interference, and multipath interference is the main reason for reducing the transmission performance of signals in path transmission. The OFDM system uses mutually orthogonal frequencies in the signal interval to multiplex a large number (tens to hundreds) of digitally modulated signals. [0003] One of the communication methods using OFDM transmission was published in "Coded OFDM System using Guard Internal Length Control" IEICE, General Conference, B-5-92, 2001. [0004] In this method of communication, a base station (described above as an access point) receives a known signal (preamble) transmitted from a mobile ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04B1/7113H04J13/00H04L5/02H04L5/14H04L27/26H04W24/10H04W28/18H04W76/02H04W88/02H04W88/08H04W92/10
CPCH04B1/692H04L27/2607H04L5/026H04L27/364H04L27/2605H04L5/1484H04L25/0216H04J11/00
Inventor 平松胜彦三好宪一须增淳
Owner INTERDIGITAL PATENT HLDG INC
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