Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system

a mobile communication system and data message technology, applied in orthogonal multiplex, multiplex communication, phase-modulated carrier systems, etc., can solve the problem that the modulation scheme cannot effectively reduce the papr in the mobile communication system, and achieve the effect of reducing the peak-to-average power ratio and improving the power efficiency of the mobile station

Inactive Publication Date: 2006-09-28
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] It is, therefore, an object of the present invention to provide an apparatus and method for modulating a data message that is c

Problems solved by technology

However, there is a problem that the above-mentioned modulation scheme

Method used

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  • Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system
  • Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system
  • Apparatus and method for modulating data message by employing orthogonal variable spreading factor (OVSF) codes in mobile communication system

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Embodiment Construction

[0027] Referring to FIG. 1, there is shown a block diagram illustrating a mobile station to which the present invention is applied. As shown, the mobile station includes a user interface 20, a central processing unit (CPU) 180, a modem 12, a source codec 30, a frequency converter 80, a user identification module 50 and an antenna 70. The modem 12 includes a channel codec 13, a modulator 100 and a demodulator 120. The channel codec 13 includes an encoder 110 and a decoder 127.

[0028] The user interface 20 includes a display, a keypad and so on. The user interface 20, coupled to the CPU 180, generates a data message in response to a user input from a user. The user interface 20 sends the data message to the CPU 180.

[0029] The user identification module 50, coupled to the CPU 180, sends user identification information as a data message to the CPU 180. The source codec 30, coupled to the CPU 180 and the modem 12, encodes source data, e.g., video, voice and so on, to generate the encode...

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Abstract

A method for converting source data to a channel-modulated signal having pairs of in-phase (I) and quadrature-phase (Q) data in a mobile station, wherein the mobile station includes: encoding the source data to generate at least one data part and a control pant; generating a spreading code to allocate to a channel, wherein each spreading code is selected on the basis of a data rate of the data part and the control part and spreading codes are selected so two consecutive pairs of I and Q data correspond to two points located on same point or symmetrical with respect to a zero point on a phase domain; and spreading the control part and the data part with the spreading code, to generate the channel-modulated signal. The method is capable of improving a power efficiency of a mobile station of a mobile communication system by reducing a peak-to-average power ratio.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an apparatus and method for modulating a data message in a mobile communication system; and, more particularly, to an apparatus and method for modulating a data message by employing orthogonal variable spreading factor (OVSF) codes in a mobile communication system. DESCRIPTION OF THE PRIOR ART [0002] Generally, a mobile communication system such as an international mobile telecommunication-2000 (IMT-2000) system is capable of providing various services of good quality and large capacity, an international roaming and so on. The mobile communication system can be applicable to high-speed data and multimedia services such as an Internet service and an electronic commerce service. The mobile communication system carries out orthogonal spread with respect to multiple channels. The mobile communication system allocates the orthogonal spread channels to an in-phase (1) branch and a quadrature-phase (Q) branch. A peak-to-average...

Claims

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Application Information

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IPC IPC(8): H04B1/00H04B1/707H04J11/00H04L27/20H04J13/12H04J13/20
CPCH04B2201/70703H04J13/0044H04B1/7073H04J13/20Y02B60/50H04J13/10
Inventor BANG, SEUNG-CHANKIM, TAE-JOONGKIM, JAE-HEUNGKIM, JUNG-IMCHAE, JONG-SUKLEE, HYUCK-JAESHIM, JAE-RYONGLEE, NARM-HEE
Owner ELECTRONICS & TELECOMM RES INST
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