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Communication terminal and radio communication method

A communication terminal and wireless communication system technology, which is applied in the field of communication terminal devices, can solve problems such as communication deterioration, and achieve the effect of shortening processing time and reducing computing burden

Inactive Publication Date: 2004-06-02
OPTIS WIRELESS TECH LLC
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Problems solved by technology

Therefore, in the reception section of the communication terminal apparatus (equivalent to the transmission section of the base station apparatus), there is a problem that communication deteriorates in the reception section of the communication terminal apparatus because the opposite characteristic of the channel condition is not updated.
image 3 The example shown is symmetric communication, but if it is asymmetric communication, the deterioration of communication becomes significant if precoding is also performed using tap coefficients estimated at the previous time

Method used

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  • Communication terminal and radio communication method
  • Communication terminal and radio communication method
  • Communication terminal and radio communication method

Examples

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Embodiment Construction

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0034] Figure 4 is a structural block diagram of a base station device according to an embodiment of the present invention, Figure 5 is a block diagram showing the structure of a communication terminal device according to an embodiment of the present invention.

[0035] Figure 4 The shown base station apparatus includes: a plurality of antennas 101; a direction control unit 102 that controls the directivity of reception and transmission; and a replica generation unit that generates replicas using an adaptive algorithm 103 that obtains tap coefficients of filters of estimated transmission lines 104; the judgment section 105 that compares the copy and the transmission data to determine the data; the error detection section 106 that performs error detection processing on the determined data; the modulation section 107 that digitally modulates the transmissio...

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Abstract

The processing up to initial value setting in adaptive algorithm in a communication terminal apparatus is omitted by the use of a tap coefficient set by the adaptive algorithm in a base station as an initial value, and thereby the load of the calculation of equalization processing in the communication terminal apparatus is decreased, and the processing time of the equalization processing is shortened.

Description

technical field [0001] The present invention relates to a communication terminal device and a wireless communication method used in a digital wireless communication system. Background technique [0002] In multimedia mobile communication, since not only sound but also data and images are transmitted, high-speed and highly reliable transmission is required. In order to realize such transmission, it is necessary to suppress intersymbol interference due to frequency selective fading. [0003] As a method of suppressing such frequency selective fading, there is a precoding technique. In this precoding technique, a base station performs channel estimation using an uplink received signal to obtain a channel estimated value, and by assigning an inverse characteristic of the channel estimated value to a downlink signal and transmitting it to a communication terminal, ideally, it is not necessary to The communication terminal corrects the distortion of the signal in the transmissio...

Claims

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Application Information

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IPC IPC(8): H04L5/16H04B3/06H04B7/005H04B7/04H04B7/08H04L25/03
CPCH04L25/03038H04L2025/03808H04L25/03006H04L2025/03656H04L2025/03471H04B7/005
Inventor 齐藤佳子上杉充加藤修
Owner OPTIS WIRELESS TECH LLC
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