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Spread spectrum communication transmitter and receiver, and CDMA mobile communication system and method

Inactive Publication Date: 2009-11-24
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]A specific object of the present invention is to provide a CDMA transmitter and a CDMA receiver which can realize a CDMA mobile communication system in which an interference by signals transmitted via pilot channels by base stations is eliminated and an increased channel capacity and an improved SIN ratio can be obtained.

Problems solved by technology

However, the conventional CDMA mobile communication system thus configured has a disadvantage in that a good S / N ratio cannot be obtained at the time of receiving the pilot signals from the base stations due to the fact that all the base stations continue to transmit the pilot signals.

Method used

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  • Spread spectrum communication transmitter and receiver, and CDMA mobile communication system and method
  • Spread spectrum communication transmitter and receiver, and CDMA mobile communication system and method
  • Spread spectrum communication transmitter and receiver, and CDMA mobile communication system and method

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Experimental program
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first embodiment

[0060]FIG. 7 is a block diagram of a spread spectrum communication transmitter used in a CDMA mobile communication system according to the present invention. In FIG. 7, parts that are the same as those shown in the previously described figures are given the same reference numbers.

[0061]The transmitter shown in FIG. 7 includes a pilot channel transmit unit 40, and n traffic channel transmit units 411, 412, . . . , and 41n, which communicate with the first, second, . . . , and nth mobile stations. The pilot channel transmit unit 40 includes a pilot transmission timing generator 50 in addition to the aforementioned pilot data generator 1, the information modulator 2 and the spread spectrum modulator 3. The pilot transmission timing generator 50 generates a pilot transmission timing signal, which is applied to the pilot data generator 1, the information modulator 2 and the spread spectrum modulator 3. In this regard, the pilot channel transmit unit 40 shown in FIG. 7 differs from that s...

second embodiment

[0086]A description will now be given of the present invention.

[0087]FIG. 13 is a block diagram of a spread spectrum communication receiver according to the second embodiment of the present invention. In FIG. 13, parts that are the same as those shown in the previously described figures are given the same reference numbers. The receiver shown in FIG. 13 has a pilot channel receive unit 44A in which a propagation path state estimating unit 17 is provided. The propagation path state estimating unit 17 estimates the state of the propagation path by using the pilot signals intermittently transmitted.

[0088]FIG. 14 shows a structure of the propagation path state estimating unit 17. As shown in FIG. 14, the unit 17 includes a fading variation measuring part 250 and a fading variation estimating part 251 receiving an output signal of the fading variation measuring part 250.

[0089]In the actual mobile communication systems, a radio wave propagated through a transmission path is affected by mu...

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Abstract

A transmitter used in a CDMA mobile communication system includes a pilot channel transmit unit which intermittently transmits a pilot signal in a spread spectrum formation, and traffic channel transmit units which respectively transmit data signals in respective traffic channels.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a CDMA (Code Division Multiple Access) mobile communication system and method using a spread spectrum communication system. Further, the present invention is concerned with a spread spectrum communication transmitter and receiver used for such a CDMA mobile communication system.[0003]2. Description of the Related Art[0004]FIG. 1 is a block diagram of a base station transmitter used in a CDMA mobile communication system using a conventional spread spectrum communication system, which is typically described in the IS / 95 that is a standard system in the U.S. Telecommunications Industry Association / Electronic Industries Association (TIA / EIA). FIG. 2 is a block diagram of a mobile station receiver in the CDMA mobile communication system.[0005]The transmitter shown in FIG. 1 can simultaneously communicate with n mobile stations where n is an integer. More particularly, the transmitter includes...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04B7/216H04B1/707H04B1/712H04B7/26H04W24/02H04W56/00H04W76/02
CPCH04B1/707H04B7/2637H04B2201/70701H04B1/7073
Inventor SUNAGA, TERUMI
Owner SONY CORP