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Radio communication equipment using algorithm diversity

A technology of communication equipment and algorithms, applied in multiplex communication, diversity/multi-antenna system, multiplex code allocation, etc., can solve difficult problems such as modulation methods and parameters

Inactive Publication Date: 2002-09-25
PANASONIC CORP
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Furthermore, since the most suitable demodulation method and parameters are related to line conditions such as fading distance and distribution of various delays, it is difficult to adopt the most appropriate modulation method and parameters for various line conditions, such as which modulation method or Which line conditions are the parameters useful for, etc.

Method used

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  • Radio communication equipment using algorithm diversity
  • Radio communication equipment using algorithm diversity
  • Radio communication equipment using algorithm diversity

Examples

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no. 1 example

[0035] In the first embodiment, a case where a base station processes data using spreading codes with different spreading factors will be described.

[0036] image 3 is a schematic configuration diagram showing the CDMA system used in the first embodiment of the present invention. In this system, the transmitting end includes an extension part 102 for code-spreading the transmitted data 101; a modulation part 103 for modulating the code-spread data; and a transmitting antenna for transmitting modulated signals. In addition, in this system, the receiving end includes a receiving antenna 105 for receiving the transmitted signal; a demodulation part 106 for demodulating the received signal; a despreading part 107 for despreading the demodulated data with a spreading code .

[0037] Next, operations in the CDMA system having the above configuration will be explained. First, transmission data 101 is spread with a certain spreading code in spreading section 102 . Then, the thus...

no. 2 example

[0059] In the second embodiment, a case will be described in which base stations process data using spreading codes having the same spreading factor.

[0060] Figure 7 is a block diagram showing the schematic structure of the receiving part of the base station of the CDMA system, Figure 8 is a diagram explaining the operation. exist Figure 7 Among them, the receiving section at the base station mainly includes a receiving antenna 301 for receiving code spread signals; a radio section 302 for converting received signals into baseband signals; first to eighth demodulators #1 to #8 (303, 305, 307, 309, 311, 313, 315, and 317); selector 327, used to select modulation data; quality selector 328, used to detect the quality of the signal; algorithm diversity controller 329.

[0061] The first to eighth modulators output the first to eighth demodulation results 304, 306, 308, 310, 312, 314, 316, and 318 to the selector 327 and the quality selector 328, respectively. Each modula...

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Abstract

The feature of the present invention is that, in the receiving part of the CDMA system base station including the receiving antenna, the radio part, and the demodulator whose number is equivalent to the number of users and can utilize spreading codes having a plurality of spreading factors, an algorithm diversity controller and a selection algorithm are equipped. The device provides the information related to the spreading factor of the spreading code used by the user to the algorithm diversity controller, and the algorithm diversity controller instructs the number of demodulators and the selectors that are equipped with the number of users to be equivalent to the number of users. When a signal transmitted by a user using a spreading code with a small spreading factor, that is, a signal with a high symbol rate, demodulates the signal by using a different reception method or different parameters at the demodulator left due to the small spreading factor , so as to select the demodulated signal with the highest quality. #!

Description

technical field [0001] The present invention relates to radio communication devices employing algorithmic diversity for use in communication systems such as CDMA (Code Division Multiple Access) and others. Background technique [0002] In the CDMA system, since information signals of users are spread with spreading codes assigned to each user, users can be identified by spreading codes. This makes it possible to multiplex signals of multiple users in the same frequency band, thereby making efficient use of frequencies. [0003] In a conventional base station in a CDMA system, an information signal spread with spreading codes having different spreading factors can be transmitted. In this CDMA system, in the case where all users transmit information signals spread with a spreading code with the largest spreading factor, the number of users is the largest, which means that the information signal has the smallest symbol rate. [0004] For example, halving the spreading factor ...

Claims

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Application Information

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IPC IPC(8): H04J13/00H04B1/711H04B7/08H04L1/02
CPCH04B1/707H04J13/16H04L1/02H04B1/708H04B7/02
Inventor 上杉充加藤修
Owner PANASONIC CORP
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