Frequency domain equalization in communications systems with scrambling

A technology of frequency domain equalization and equalization, applied in multi-frequency code system, transmission control/equalization, secure communication, etc.

Inactive Publication Date: 2005-10-12
SOMA NETWORKS INC
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, it is not feasible to use the FDEq described above in this type of DS-CDMA communication system

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
  • Frequency domain equalization in communications systems with scrambling
  • Frequency domain equalization in communications systems with scrambling
  • Frequency domain equalization in communications systems with scrambling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] As mentioned above, so far, frequency domain equalization in DS-CDMA system is still not feasible. According to an embodiment of the present invention, in order to apply frequency domain equalization to the DS-CDMA system, the transmitted data block is spread by adding a prefix and suffix known to the receiver before being scrambled, or the transmitted data block is Spreading is done after scrambling but before transmission so it has a scrambled cyclic prefix. In the former case, the receiver synthesizes the prefixes, data blocks or suffixes that would have been received if the scrambled spread transmitted data blocks had a cyclic prefix. In each variant embodiment of the invention, the above-described diagonalization process is performed on the receiving block or the compositing block. To simplify the discussion below, it is assumed that the receiver "knows" (has previously determined) the channel response.

[0057] In the discussion below and the attached Figure 4 ...

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 method of, and system for applying frequency-domain equalization in a DS- CDMA system, either by augmenting the transmitted data block before it is scrambled by appending a prefix and a suffix known to or knowable by the receiver or by augmenting the transmitted data block after it is scrambled b ut prior to transmission so that it has a scrambled cyclic prefix. In the forme r case, the receiver synthesizes one of the prefix, the data block, or the suffix that would have been received if the augmented transmitted data block after scrambling had had a cyclic prefix.

Description

field of invention [0001] The present invention relates to a method and system for providing frequency domain equalization in a Direct-Sequence Code-Division Multiple-Access (DS-CDMA) system. Background of the invention [0002] Communication channels suffer from dispersion (time spreading) of the transmitted signal. In radio channels, for example, dispersion is caused by the fact that the received signal is actually a superposition of multiple echoes and reflections of the transmitted signal, each of which takes a different physical propagation path. In other channel media such as cable systems, different propagation velocities at different frequencies and other phenomena can lead to similar dispersion. These different signal components can interfere constructively and destructively, resulting in signal level fluctuations known as multipath fading. [0003] Regardless of the dispersion mechanism, a general model for this effect is the linear discrete-time tapped delay lin...

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): H04B1/707H04B7/005H04K1/10H04L25/03
CPCH04L25/03165H04L25/03159H04L2025/03522H04L2025/03484H04L2025/03375H04B1/7115H04B1/7097
Inventor 吴士泉让-菲利普·拉罗什勒内·R·C·拉蒙塔涅弗兰克·R·克希尚杰弗里·T·戴恩斯
Owner SOMA NETWORKS INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap