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PN code producing method and device

A generation method and technology for generating devices, which are applied in the direction of safety devices, selection devices, multiplexing code generation, etc., and can solve the problems of inability to shut down devices and inability to reduce power consumption, etc.

Inactive Publication Date: 2003-03-12
INVT SPE LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, in the existing PN code generating device, the long PN code with a cycle much longer than the intermittent receiving cycle must keep the code pattern synchronization even when not receiving, so there is a problem that the device cannot be turned off and the power consumption cannot be reduced. question

Method used

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  • PN code producing method and device

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Embodiment Construction

[0026] Before the embodiment of the present invention is described in detail, the calculation principle used for "from the state of the PN code generator at a certain moment to obtain the state of the PN code generator when shifting a predetermined number of times" is explained.

[0027] Consider cyclic codes first. Cyclic codes (n, k) (n is the length of the code, k is the length of the information bit) take the polynomial with the information bit as the coefficient as M(x), (k-1) times, and take the generator polynomial as G(x) , (n-k) times, divide M(x)x by G(x) n-k It is enough to find the remainder, and it is expressed as formula (1) when calculating.

[0028] M(x)x n-k =Q(x)G(x)+R(x) ... (1) where R(x), degree (n-k-1) is a residual polynomial providing redundant bits. Transform formula (1) into

[0029] M(x)x n-k -R(x)=Q(x)G(x)...(2) then M(x)x n-k -R(x) becomes a codeword divisible by G(x).

[0030] With G(x)=x m +g m-1 x m-1 +...+g1x+g0 (m=n-k) based division...

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Abstract

The patent relates to PN code generator and mobile radio commucation system. In a PN code generating apparatus, a code of the predetermined number of stages is generated using primitive polynomial G(x), then the code content of each stage is shifted to the next stage. And a state setting section obtains a code state of the PN code generating section after shifted the specific times from a code state of the PN code generating apparatus at a certain time, based on ximodG(x) as the number of shift times is i.

Description

[0001] This application is a divisional application of the invention patent application submitted on August 27, 1998 with the application number 98118564.9. technical field [0002] The present invention relates to a PN code generating device and a generating method that can be used by a mobile device of a mobile communication system that performs intermittent reception, such as a CDMA (Code Division Multiple Access, Code Division Multiple Access) communication system. Background technique [0003] In recent years, the use of CDMA-based mobile communication in the field of digital mobile communication has attracted attention. In the United States, TIA (Telecommunications Industry Association) standardized the CDMA-based mobile communication system and summarized it as "for dual-mode wideband spread spectrum digital Mobile Station-Base Station Compatibility Standard for Cellular Network System, Mobile Station-BaseStation Compatibility Standard for Dual Mode Wideband Spectrum D...

Claims

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Application Information

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IPC IPC(8): G06F7/58H03K3/84H04J13/00H04J13/10H04W12/00H04W88/02H04W88/08
CPCG06F7/584H04J13/10H04J13/0022H03K3/84Y02D30/70H04J13/0074
Inventor 浅野延夫
Owner INVT SPE LLC
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