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Parallel spread spectrum communication system and method

A technology of data communication and bit expansion, which is applied in transmission system, multiplex communication, orthogonal multiplex system, etc., can solve the problem that conventional systems cannot provide enhanced processing gain practically and effectively, and cannot support large PN sequence length, PN correlator is difficult to detect, etc., to achieve low power requirements, increase communication distance, and reduce the effect of acquisition cycle

Inactive Publication Date: 2006-10-11
开普兰奇无线电马来西亚有限公司
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Problems solved by technology

However, if the nonjamming transmitter is very close to the jamming transmitter, the received signal power of the nonjamming transmitter may be much higher than that of the jamming transmitter
In this case, the PN correlator in the receiver will have difficulty detecting and despreading the weak interfering emission
[0014] Another significant disadvantage is that conventional systems cannot practically and efficiently provide enhanced processing gains
Currently, spread spectrum techniques cannot support large PN sequence lengths that improve processing gain
Additionally, conventional systems have difficulty employing optimal processing gain for forward error correction

Method used

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  • Parallel spread spectrum communication system and method

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Embodiment Construction

[0041] now refer to Figure 3-14 The preferred embodiments of the present invention are discussed, wherein like numerals indicate like elements and the leftmost value of each numeral corresponds to the numeral first used in the drawing. The description of these preferred embodiments is limited to the aspects of a radiotelephone communications system. However, the present invention has a wide range of applications, such as, but not limited to, broadband wireless point-to-point and point-to-multipoint digital communication links; low power wireless applications (such as satellite and outer space communications); telemetry applications using CDMA; WLAN applications; and secure communication channels. These preferred embodiments involve Parallel Bi-Sequence Spread Spectrum ("PBSS") techniques of spreading encoded data onto a predetermined auxiliary sequence.

[0042] The present invention can also be applied to any existing digital communication channel or link to essentially cr...

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Abstract

The invention involves a parallel spread spectrum ('PSS') technique of spreading orthogonal encoded data. In a preferred embodiment, a method and system for communicating data comprises encoding and spreading a data stream using a scheme employing orthogonal Walsh functions, and thereby segmenting the data stream into multiple bit data packets representing one of a number of true or inverted Walsh codes. The data stream is then differentially encoded for either BPSK or QPSK modulation, and spread using a PN-sequence. The parallel spread data stream is modulated for transmission to a receiver. At the receiver, the data stream is recovered by computing a cross correlation between the digitized data stream and a programmed sequence. One of the benefits of the PSS techniques over conventional communication systems is that additional processing gain plus data forward error correction can be simultaneously achieved.

Description

technical field [0001] The present invention relates to digital communications, and more particularly to systems and methods for providing spread spectrum related communications. Background technique [0002] Spread spectrum communication technology has a wide range of applications. For example, spread spectrum has its origins in military communications that are sensitive to interception / eavesdropping and vulnerable to tampering / jamming. However, a host of commercial applications for spread spectrum have been developed, especially in the field of wireless communications, eg cellular mobile communications. [0003] The basic concept of spread spectrum is contrary to long-standing communication practice. In particular, conventional practice focuses on minimizing the frequency bandwidth of information-bearing signals in order to fit more signals into the communication link (channel). On the contrary, the goal of spread spectrum is to substantially increase the bandwidth of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B1/707H04B1/713H04J11/00
CPCH04J13/18H04B1/707
Inventor K·马尔贡
Owner 开普兰奇无线电马来西亚有限公司
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