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Communication terminal apparatus and demodulation method

A communication terminal and signal technology, applied in multiplex communication, communication between multiple stations, modulation carrier system, etc., can solve problems such as inability to determine thresholds

Inactive Publication Date: 2002-10-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the DPCH including individual PLs is transmitted with weaker power than the CPICH including common PLs, in order to suppress interference with other stations, individual PLs are easily affected by noise. There are many errors in the direction and QAM demodulation cannot be performed with high precision.
[0010] Since the DSCH does not contain known signals for estimating the transmission path, there is a problem that the threshold value cannot be determined by the DSCH transmitted with high power compared to the DPCH

Method used

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  • Communication terminal apparatus and demodulation method
  • Communication terminal apparatus and demodulation method
  • Communication terminal apparatus and demodulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the base station device notifies the mobile station device of information (power ratio information) indicating the ratio of the transmission power of the specified common PL to the transmission power of the predetermined signal of the QAM-modulated DSCH, and the mobile station device correctly The embodiment of QAM demodulation is performed with high precision by configuring decision points accurately.

[0024] Figure 4 A block diagram showing the structure of a wireless transmission device according to Embodiment 1 of the present invention. As shown in the figure, the wireless transmission device of this embodiment includes a base station device 100 and mobile station devices 110-1 to 110-K. The base station apparatus 100 transmits data and control signals to the mobile stations 110-1 to 110-K. The mobile station devices 110-1 to 110-K receive signals from the base station device 100, and demodulate them in a predetermined manner.

[0025] Fig...

Embodiment 2

[0059] In this embodiment, the ratio (average power ratio) between the average value of received power of the common PL and the average value of received power of predetermined signals included in the DSCH is calculated on the mobile station device side, and the signal configuration map is determined based on the average power ratio. , so as to perform an embodiment of QAM demodulation with higher precision.

[0060] Figure 9 is a block diagram showing the configuration of the transmission device of this embodiment. As shown in the figure, the transmission device of this embodiment omits Figure 4 In the power ratio extraction unit 119 of the shown transmission device, the channel estimation unit 601 is used instead of the channel estimation unit 117 , and the DSCH demodulation unit 602 is used instead of the DSCH demodulation unit 121 . And, for Figure 9 neutralize Figure 4 The same parts are given the same reference numerals and their descriptions are omitted.

[006...

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Abstract

A base station apparatus 100 conveys information indicating the ratio of the transmission power of a common known signal (common pilot) included in a common control channel to the transmission power of a signal included in a downlink shared channel to a mobile station apparatus 110-K. Based on this power ratio information, the mobile station apparatus 110-K arranges signal points accurately and performs QAM demodulation with high precision. <IMAGE>

Description

technical field [0001] The present invention relates to a communication terminal device performing multi-value quadrature amplitude modulation and a demodulation method for demodulating a wireless signal subjected to multi-value quadrature amplitude modulation. Background technique [0002] In recent years, as a modulation method for digital wireless communication in response to increasing communication demands, amplitude modulation in which information is added to amplitude such as a multilevel quadrature amplitude modulation (multilevel QAM: Quadrature Amplitude Modulation) method is being realized. Multi-valued QAM is a modulation method suitable for land mobile communications where frequency usage is limited because it can transmit multiple bits with one symbol and improves frequency utilization efficiency for each frequency band. For example, in 16QAM, each symbol can convey 4 bits of information. Hereinafter, 16QAM will be used as a representative e...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04B1/707H04J13/00H04L1/00H04L27/38
CPCH04L1/0003H04L1/0025H04L27/3809H04L27/38
Inventor 平松胜彦
Owner PANASONIC CORP
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