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AssigneeNokia Corporation
InventorsIlkka Kontola, Samuli Pietila, Harri Valio
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The invention relates to a method for synchronizing a receiver (1) with a transmitted code-modulated spread spectrum signal. In the method, at least one reference code (r(x)) is used, which corresponds to a code used in the modulation, and the frequency shift of the transmitted signal and the code phase of the code used in the modulation are determined. In the method, a correlation step is taken to form a correlation function matrix on the basis of the received signal and said reference code. A non-coherent search matrix is formed of said correlation function matrix. In the method, elements in said non-coherent search matrix are modified on the basis of at least one statistical property of the elements in said non-coherent search matrix, and/or high-pass filtering is performed before the formation of said correlation function matrix. The invention also relates to a system and a receiver in which the method is applied.
A method for synchronizing a receiver with a transmitted code-modulated spread spectrum signal, in which method at least one reference code is used, which corresponds to a code used in the modulation, and the frequency shift of the transmitted signal and the code phase of the code used in the modulation are determined, wherein a correlation step is taken to form a correlation function matrix on the basis of the received signal and said reference code, a non-coherent search matrix is formed of said correlation function matrix, and that the method comprises at least one of the following steps:
A system comprising a receiver with means for acquisition of a code-modulated spread spectrum signal, means for generating at least one reference code corresponding to the code used in the modulation, and means for determining the frequency shift of the transmitted signal and the code phase of the code used in the modulation, wherein the system also comprises correlation means for forming a correlation function matrix on the basis of the received signal and said reference code, means for forming a non-coherent search matrix from said correlation function matrix, and at least one of the following means:
An electronic device comprising a receiver with means for acquisition of a code-modulated spread spectrum signal, means for generating at least one reference code corresponding to the code used in the modulation, and means for determining the frequency shift of the transmitted signal and the code phase of the code used in the modulation, wherein the electronic device also comprises correlation means for forming a correlation function matrix on the basis of the received signal and said reference code, means for forming a non-coherent search matrix from said correlation function matrix, and at least one of the following means:
Dependencies are inferred from the claim text.