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Mobile-terminal-for-transmission-diversity-CDMA-communication-system

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Mobile terminal for transmission diversity CDMA communication system

Details

Inventors: Komatsu, Masahiro;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Maung; Nay
Assistant Examiner: Orgad; Edan
Attorney, Agent or Firm: Sughrue Mion, PLLC

The mobile terminal of the present invention receives signals from the base station which receives the control command from the mobile terminal and executes, on the basis of the control command, the antenna switching transmission diversity. The mobile terminal includes: a reception unit for receiving downward signal from the base station; a downward link estimation unit for estimating the downward link on the basis of the received downward signal; an upward link estimation unit for estimating the upward link on the basis of the received downward signal; a base station estimation unit for estimating a state of the base station on the basis of the outputs from the downward estimation unit and the upward estimation unit; and a demodulator unit for demodulating the received signal on the basis of the output from the base station estimation unit.

DETAILED DESCRIPTION What is claimed is: 1.
A mobile terminal which transmits a control command to a base station which is provided with two or more antennas for transmission diversity, which comprises: a reception unit for receiving a downward signal from said base station; a downward link estimation unit for estimating said downward link on the basis of said downward signal; an upward link estimation unit for estimating said upward link on the basis of said downward signal; a base station estimation unit for estimating a transmission state of said base station on the basis of the outputs from said downward estimation unit and said upward estimation unit; and a demodulator unit for demodulating said downward signal on the basis of the output from said base station estimation unit, wherein said base station estimation unit estimates said transmission state of said base station on the basis of said downward link estimated by said down link estimation unit, when said downward link is in a good condition and said upward link is in a bad condition, while said base station estimation unit estimates that said base station executes a transmission in accordance with said control command from mobile terminal, when said downward link is in a bad condition and said upward link is in a good condition.
2.
The mobile terminal according to claim 1, wherein said base station estimation unit estimates said transmission state of said base station on the basis of said downward link estimated by said down link estimation unit, when said downward link is in a bad condition and said upward link is in a bad condition.

Description:
BACKGROUND OF THE INVENTION 1.
Technical Field of the Invention The present invention relates to mobile terminals such as digital land mobile radiotelephones and pocket telephones, and particularly to mobile terminals for code division multiple access (CDMA) or CDMA frequency division duplex (CDMA/FDD).
2.
Description of the Prior Art The diversity is used for overcoming the fading or a fluctuation of a level of received electromagnetic wave due to interference by the waves which propagate through various routes

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