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CDMA mobile communication receiver, method and system

A communication receiver, a technology for receiving energy, applied in transmission systems, wireless communications, radio transmission systems, etc., and can solve problems such as transmission fading

Inactive Publication Date: 2004-09-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the sector transmitters of the same base station are co-located, their transmissions will be subject to simultaneous fading, which causes the reception quality in the mobile station to drop below acceptable limits

Method used

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  • CDMA mobile communication receiver, method and system
  • CDMA mobile communication receiver, method and system
  • CDMA mobile communication receiver, method and system

Examples

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Embodiment Construction

[0049] Figure 6is a block schematic diagram illustrating a mobile communication receiver constructed in accordance with the present invention. As in the prior art RAKE receiver of FIG. 1 , a receiver input signal 1 is input to a plurality of spreading code demodulation circuits (also called finger circuits) 2 and a search circuit 8 . Each finger outputs a demodulated signal 3 which is input to a combining circuit 4 . The combining circuit 4 outputs a combined demodulated signal 5 which is the weighted sum of the demodulated signals 3 . A search circuit 8 is provided to continuously measure the received energy of each transmission in the receiver input signal 1 according to its transmitted spreading code phase and received timing. The search circuit 8 outputs the received energy, spreading code phase, and received timing of each transmission as update information 9 to the table update circuit 11 .

[0050] The mobile communication receiver constructed according to the prese...

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Abstract

A demodulator for a cellular communications receiver system is disclosed which preferentially selects for concurrent demodulation the transmissions which originate from different base stations. The cellular receiver system selects a group of transmissions having the highest reception energies at each reception timing and preferentially assigns those transmissions to be demodulated. The receiver is also equipped to select a second group of transmissions having reception energies other than the highest at each reception timing. The receiver is provided with a priority one table and a priority two table for storing records of the reception energy and reception timing for each respective group of transmissions.

Description

technical field [0001] The present invention relates to a spread spectrum mobile communication receiver, and more particularly to a system and method for providing improved reception by a mobile communication receiver when communicating near boundaries between different transmission areas. Background technique [0002] In recent years, digital mobile communication systems implementing Code Division Multiple Access (CDMA) have attracted attention. In the United States, the Telecommunications Industry Association (TIA) has adopted a standard for CDMA. The specification and operating principles of this standard have been summarized as "Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Digital Cellular System" (IS-95) (hereinafter referred to as "CDMA Standard"). [0003] According to the CDMA standard, information signals are transmitted by area-wide transmitters on code division multiplexed channels occupying the same transmission frequ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/04H04B7/26
CPCH04B7/0491H04B1/707H04B1/7117H04B1/7073H04W72/563
Inventor 浅野延夫大崎吉晴
Owner PANASONIC CORP
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