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Random code acquisition

A technology for obtaining circuits and local devices, which is applied in the field of code synchronization devices, and can solve problems such as frequency and timing uncertainty of received signals

Inactive Publication Date: 2004-07-28
NOKIA SIEMENS NETWORKS GMBH & CO KG
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  • Abstract
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Problems solved by technology

[0008] When spread-spectrum signals are transmitted over rapidly varying distances between the transmitter and receiver of a spread-spectrum system, for example, frequency and timing uncertainties in the received signal may arise due to Doppler shift

Method used

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  • Random code acquisition
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Embodiment Construction

[0039] Receivers used to detect and recover direct sequence spread spectrum signals are generally equipped with means to detect the transmitted signal and restore the received signal form to substantially baseband frequency signals. The received spread spectrum signal is then compressed. For this purpose, the receiver is equipped with means for synchronizing the locally generated reference code with the spreading code of the received signal. Figure 1 shows a circuit block diagram of an acquisition circuit used to acquire code synchronization. In FIG. 1 , the received spread spectrum signal is sent to the variable delay device 1 through the wire 2 . A delayed received signal of one form is then fed from variable delay 1 to a first input of scaled multiplier 3 . A signal from the code generator 4 is supplied to a second input of the scaling multiplier 3, the signal representing a local reference spreading code for spreading the spectrum of the received radio signal. The outpu...

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Abstract

A code acquisition circuit for acquiring code synchronization between an n-chip spreading code of a received spread spectrum radio signal and an n-chip local reference code generated by a code generator within a receiver, includes a variable delay means which operates to introduce a delay shift into the said received radio signal. A correlator operates to correlate n-chips of the local reference code with n-samples of the received signal communicated thereto, and generates a correlation signal representative of a result of the correlation. A code acquisition controller operates in combination with the correlation signal to maintain the delay shift for at least one correlation and thereafter to change the delay shift, wherein the delay shift is a fraction of one chip period.

Description

[0001] This application is a divisional application of the Chinese patent application 97115362.0 filed on July 23, 1997, entitled "Obtaining Random Codes". technical field [0002] The invention relates to a device for acquiring code synchronization between a spreading code and a local reference code of a received spread spectrum radio signal. More specifically, the present invention relates to an apparatus for acquiring code synchronization between a spreading code of a received spread spectrum radio signal and a local reference code, wherein there is a time sum between the received spread spectrum radio signal and the local reference code. Frequency offset. [0003] In addition, the present invention relates to a method for acquiring code synchronization between a received spread spectrum radio signal and a local reference code, and more particularly, to a method for acquiring code synchronization in which, between the received spread spectrum radio signal and the local refe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B1/709H04B1/7075H04B1/70755H04B2201/7071
Inventor A·P·胡尔伯特
Owner NOKIA SIEMENS NETWORKS GMBH & CO KG
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