Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for generating quasi-orthogonal code and spreading channel signals in mobile communication system

A communication system, quasi-orthogonal technology, applied in the direction of transmission system, wireless communication, secure communication, etc., can solve the problem of limited number of available orthogonal codes, hindering channel capacity, etc.

Inactive Publication Date: 2001-03-07
SAMSUNG ELECTRONICS CO LTD
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the number of available orthogonal codes is limited
This limitation will hinder the increase of channel capacity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for generating quasi-orthogonal code and spreading channel signals in mobile communication system
  • Device and method for generating quasi-orthogonal code and spreading channel signals in mobile communication system
  • Device and method for generating quasi-orthogonal code and spreading channel signals in mobile communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Detailed description of the preferred embodiment

[0030] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the invention in unnecessary detail.

[0031] In a CDMA communication system, in order to increase channel capacity or maximize the capacity of a single cell, the invention generates quasi-orthogonal codes with limited interference to orthogonal codes.

[0032] The binary orthogonal code should satisfy the following equation: Here, i=0,1,2,...,log 2 M-1.

[0033] In equations (1) to (3), W k (t) represents the kth Walsh orthogonal code sequence whose length is N (1≤k≤N), S i (t) represents the i-th quasi-orthogonal code of length N (1≤i≤X), where X represents the number of orthogonal codes satisfying conditions 1 to 3. Condition 1 expressed by equation (1) express...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A device and method for generating a binary quasi-orthogonal code in a CDMA communication system. The method comprises generating an m-sequence, and specific left and right sequences having a good full correlation property with the m-sequence; column permuting the specific left and right sequences in a column permutation method used when converting the m-sequence to a Walsh orthogonal code, and connecting the left sequences to the right sequences to generate mask candidates; operating the mask candidates and Walsh orthogonal codes having the same length as the mask candidates to generate quasi-orthogonal code candidate families; and selecting a quasi-orthogonal code out of the generated quasi-orthogonal code candidate families, the selected quasi-orthogonal code satisfying a partial correlation property with the Walsh orthogonal codes, and selecting a mask related to generation of the selected quasi-orthogonal code.

Description

Background of the invention [0001] 1. field of invention [0002] The present invention generally relates to a channel communication device and method used in a CDMA communication system, and specifically relates to a device and a method for generating binary quasi-orthogonal codes and using the generated binary quasi-orthogonal codes to spread channel signals. [0003] 2. Related Technical Notes [0004] Generally, a CDMA (Code Division Multiple Access) mobile communication system utilizes orthogonal codes for channel division in order to increase channel capacity. Orthogonal codes commonly used are Walsh (Walsh) orthogonal codes. For example, the forward link specified in the IS-95 / IS-95A standard uses Walsh orthogonal codes to divide the channel. [0005] Figure 1 shows the IS-95 / IS-95A forward link using Walsh orthogonal codes to split the channel. Referring to FIG. 1, each channel is divided by a unique Walsh orthogonal code Wi (here, i=0 to 63), respectively. The ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B7/216H04B15/00H04J13/00H04J13/10H04K1/00H04L27/30H04Q1/00H04W88/18
CPCH04J13/0048H04J13/10
Inventor 梁景喆金宰烈姜熙原金英基
Owner SAMSUNG ELECTRONICS CO LTD