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Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system

A code division multiple access, slow frequency hopping technology, applied in the field of code division multiple access systems, can solve problems such as mutual interference

Inactive Publication Date: 2004-03-10
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, in this multi-carrier DS CDMA system, each user uses the entire frequency band, which brings mutual interference with other users in the entire frequency band

Method used

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  • Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system
  • Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system
  • Parallel hopping hybrid direct sequence/slow frequency hopping CDMA system

Examples

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Embodiment Construction

[0022] The present invention provides a hybrid DS / SFH CDMA wireless communication system that combines aspects of a Direct Sequence (DS) Code Division Multiple Access (CDMA) system with a Frequency Hopping (FH) CDMA system and a multi-carrier system.

[0023] A hybrid DS / SFH CDMA system according to the present invention may be referred to as a partial transmission multi-carrier DS CDMA system. However, in actual operation, the method of the present invention does not produce frequency hopping of PN sequence values ​​in the frequency synthesizer as conventional hybrid DS / SFH CDMA systems do. Instead, the present invention arbitrarily selects a subset of frequencies from a set of available carriers for parallel transmission. That is, the set of available carriers consists of a set of "on" frequencies and "off" frequencies.

[0024] In addition, compared with the partial transmission multi-carrier DS CDMA system that continuously transmits a predetermined subset of carrier freq...

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Abstract

A transmitter for a parallel hopping hybrid direct sequence slow frequency hopping code division multiple access system comprises a data signal generator for generating a data signal waiting for transmitting; a spreader for spreading a data signal to produce a spread spectrum signal; a plurality of frequency hopping apparatus for performing frequency hopping by multiplying the spread spectrum signal by a carrier for each of a plurality of sub-bands; a plurality of gate function generators for selecting specific ones of the sub-bands; and a combiner for combining the selected spread spectrum signal of sub-bands by the gate function; a RF transmitter for transmitting the multiplying signal.

Description

technical field [0001] The invention relates to a code division multiple access (CDMA) system, in particular to a parallel hopping hybrid direct sequence (DS) / slow frequency hopping (SFH) code division multiple access (CDMA) system. Background technique [0002] In the past decade, wireless communication has been greatly developed. At the beginning of the next century, the wireless communication market will reach 60 billion US dollars. In order to meet the ever-increasing needs in the future, the key link in the wireless network lies in the expanded wireless channel capability. [0003] Currently, there are two basic schemes for allocating fixed spectrum resources to different users: a narrowband channel allocation system and a broadband system. There are two types of narrowband systems, the first employs Frequency Division Multiple Access (FDMA), where each user is assigned to a different frequency. Guard bands are reserved between adjacent signals to minimize crosstalk ...

Claims

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Application Information

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IPC IPC(8): H04B1/69H04B1/692H04B7/26H04W72/04H04W88/02H04W88/08
CPCH04B1/692H04B7/2621H04B1/708H04B1/709H04B1/7136H04J13/16
Inventor 朴赞范
Owner SAMSUNG ELECTRONICS CO LTD
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