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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
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  • 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

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  • 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

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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 ...

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PUM

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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

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Application Information

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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
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