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Mobile communicating system

A mobile communication system and mobile device technology, applied in the field of mobile communication systems, can solve the problem that the control cannot keep up with the faster changes of the transmission path, etc.

Inactive Publication Date: 2003-10-08
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the disadvantage is more pronounced if intermittent launches are performed
As the number of thinned slots increases, the control interval is lengthened such that the control cannot keep up with faster changes in the transmission path

Method used

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  • Mobile communicating system
  • Mobile communicating system
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Examples

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Embodiment Construction

[0040] The present invention will be described in detail by way of examples.

[0041] figure 1 The transceiver part of the base station included in the mobile communication system of the embodiment of the present invention is given. This mobile communication system completes the transfer of data between the base station and each mobile phone through the function of the code division multiple access system.

[0042] The transceiver part 100 of the base station comprises: an antenna 101, an antenna transceiving converter 102 connected with the antenna 101, a transmitting part 104 typically comprising a radio transmitter 103, and typically comprising a receiving radio receiver 105 Section 106.

[0043] The radio receiver 105 included in the receiving section 106 performs conversion of a signal received on a radio frequency band into a composite baseband signal. The complex baseband signal is composed of an in-phase component and a quadrature component. The composite baseband ...

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Abstract

A mobile communication system in code division multiple access mode, in order to reduce the interference between channels, it reduces the control error of uplink transmission power. The receiving part of the base station has a pilot code symbol in-phase addition circuit for detecting carrier signal points. The amplitude correction circuit fetches the control value of the previous transmit power from the memory to correct the carrier signal point. The prediction circuit predicts the carrier signal point when the next power control is performed at the carrier signal point. A comparison circuit compares the carrier signal point with a reference signal. The transmission power control circuit generates the next transmission power control value sent to the mobile device and stores it in the memory. The mobile transmits power according to the control value.

Description

technical field [0001] The present invention relates to a mobile communication system, which has a transmission power control circuit for controlling the transmission power, especially relates to a car phone or a portable phone which is suitable for being provided with a direct diffusion code division multiple access system. Background technique [0002] Generally, various systems have been used as cellular systems for vehicle-mounted or portable telephone systems. Those known systems include a Japanese standard system (PDC: RCR STD27), a North American standard (TIAIS54), and a European standard system using Time Division Multiple Access (TDMA), and another North American standard system (TIA IS95 ), which employs Code Division Multiple Access (CDMA). [0003] A cellular system using code division multiple access is arranged so that two or more mobile phones connect to a base station via a carrier frequency of one frequency. This cellular system requires the base station ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04B7/005H04B7/216H04B7/26H04J13/00H04W52/00H04W52/22
CPCH04W52/221H04W52/223H04B7/26
Inventor 佐藤俊文
Owner NEC CORP
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