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Base station apparatus, communication terminal apparatus and communication method

A technology of communication terminals and base stations, which is applied in communication between multiple stations, wireless communication, multiplexing communication, etc., and can solve problems such as path misdetection, deterioration of reception quality, and deterioration of line estimation accuracy in data parts, etc.

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

AI Technical Summary

Problems solved by technology

[0012] However, the above-mentioned existing cellular communication system has the following problem: Since the common pilot signal inserted in each sub-slot is time-division multiplexed, it is difficult to detect the demodulation timing of the received signal when the propagation environment changes drastically. The false detection of the path is caused in the path search, which deteriorates the accuracy of the line estimation of the data part, resulting in the deterioration of the reception quality

Method used

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  • Base station apparatus, communication terminal apparatus and communication method
  • Base station apparatus, communication terminal apparatus and communication method
  • Base station apparatus, communication terminal apparatus and communication method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] FIG. 4 is a block diagram showing the structure of base station apparatus 100 according to Embodiment 1 of the present invention.

[0032] In FIG. 4 , a base station apparatus 100 includes an antenna 101 , a duplexer 102 , a reception RF unit 103 , a despreading unit 104 , a demodulation unit 105 , and a receiving end determination unit 106 . The base station apparatus 100 further includes a data selection unit 151, a modulation scheme determination unit 152, an adaptive modulation unit 153, a spectrum spreading unit 154, an individual pilot signal generation unit 155, a modulation unit 156, a spectrum spreading unit 157, and a code division multiplexing unit 158 , a control signal generation unit 159 , a modulation unit 160 , a spectrum spreading unit 161 , a time division multiplexing unit 162 , and a transmission RF unit 163 .

[0033] The duplexer 102 outputs the signal received by the antenna 101 to the reception RF unit 103 . Also, the duplexer 102 wirelessly tra...

Embodiment 2

[0081] In Embodiment 2, a case where an adaptive array antenna (hereinafter referred to as "AAA") is applied to HDR will be described.

[0082] Fig. 7 is a block diagram showing the structure of a base station apparatus 300 according to Embodiment 2 of the present invention. In the base station apparatus 300 shown in FIG. 7, the same components as those of the base station apparatus 100 shown in FIG. 4 are given the same reference numerals as in FIG. 4, and description thereof will be omitted.

[0083] The base station apparatus 300 shown in FIG. 7 adopts the following configuration: Compared with the base station apparatus 100 shown in FIG. Section 351.

[0084]The duplexer 102 outputs each signal received by the antennas 301 to 303 to the reception RF unit 103 . Also, the duplexer 102 transmits each signal output from the transmission RF unit 163 through the antennas 301 to 303 .

[0085] The reception RF unit 103 converts each radio frequency reception signal output from...

Embodiment 3

[0097] Here, using one of the codes originally used for data transmission to transmit dedicated pilot signals results in lower transmission efficiency. In the case of using high-rate multi-value modulation methods such as 16QAM or 64QAM, it is easily affected by fading fluctuations, so it is necessary to use individual pilot signals to compensate the phase deviation of the data part, but when using low-rate modulation methods such as BPSK or QPSK In this case, the phase deviation of the data part can be sufficiently compensated even by using the common pilot signal.

[0098] In Embodiment 3, a case where transmission control of dedicated pilot signals is performed according to modulation schemes will be described.

[0099] Fig. 8 is a block diagram showing the structure of a base station apparatus 400 according to Embodiment 3 of the present invention. In base station apparatus 400 shown in FIG. 8 , the same components as those in base station apparatus 100 in FIG. 4 are assi...

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Abstract

A data selector unit (151) selects, based on a decision by a destination deciding unit (106), only the transmitted data of a corresponding communication terminal apparatus. An application modulator unit (153) modulates an output signal of the data selector unit (151) according to a modulation system specified by a modulation system deciding unit (152). A spreader unit (154) spreads and outputs an output signal of the application modulator unit (153) to a code multiplexer unit (158). An individual pilot signal generator unit (155) generates an individual pilot signal. A modulator unit (156) modulates the individual pilot signal. A spreader unit (157) spreads and outputs an outputs signal of the modulator unit (156) to the code multiplexer unit (158). The code multiplexer unit (158) code multiplexes and outputs the output signals of the application spreader unit (154) and spreader unit (157) to a time multiplexer unit (162). In this way, in a case of effecting a downstream high-speed packet transmission, the quality of receiving the data portion can be maintained at a predetermined level even when the phase varies abruptly.

Description

technical field [0001] The present invention relates to a base station device, a communication terminal device and a communication method used in a cellular communication system. Background technique [0002] A cellular communication system is a system in which one base station device and a plurality of communication terminal devices simultaneously perform wireless communication, and as demand increases in recent years, it is required to improve its transmission efficiency. [0003] An HDR (High Data Rate, high data rate) scheme has been proposed as a technique for improving the downlink transmission efficiency from a base station apparatus to a communication terminal apparatus. HDR is a method in which a base station device performs scheduling, that is, time-divides and allocates communication resources to each communication terminal device, and further sets a transmission rate for each communication terminal device according to communication qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04B1/707H04B7/06H04B7/10H04B7/26H04J13/00H04W16/28H04W24/10H04W28/18H04W52/04H04W72/04
CPCH04B7/2628H04J13/00H04B2201/70701H04B1/707
Inventor 青山高久宫和行平松胜彦三好宪一
Owner PANASONIC CORP
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