System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher
First Claim
1. A method for detecting direct sequence spread spectrum signals with a searcher comprising:
- specifying a first hypothesis for a direct sequence spread spectrum signal from a Universal Mobile Telephony System (UMTS) compliant network;
specifying a second hypothesis for a direct sequence spread spectrum signal from a Code-Division Multiple Access-2000 (CDMA2000) compliant network;
generating a pseudo-random number (PN) sequence based on the hypothesis associated with a selected one of the Universal Mobile Telephony System (UMTS) compliant and Code-Division Multiple Access-2000 (CDMA2000) compliant communications networks;
providing the PN sequence to the searcher to correlate with a received signal;
adjusting the PN sequence to conform to the selected communications network; and
correlating the adjusted PN sequence with the received signal.
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Accused Products
Abstract
System and method for detecting multiple direct sequence spread spectrum signals using a multi-mode searcher. A preferred embodiment comprises the specification of a hypothesis for a particular communications network. The hypothesis can then be used to generate a pseudo-random number (PN) sequence that is provided to a searcher. The searcher can then make adjustments to the PN sequence to bring the PN sequence to conformity with requirements of the particular communications network. The adjustment to the PN sequence permits the use of a multi-mode searcher to perform searches for signals of various communications networks with minimal hardware dedicated to each communications network.
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Citations
31 Claims
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1. A method for detecting direct sequence spread spectrum signals with a searcher comprising:
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specifying a first hypothesis for a direct sequence spread spectrum signal from a Universal Mobile Telephony System (UMTS) compliant network; specifying a second hypothesis for a direct sequence spread spectrum signal from a Code-Division Multiple Access-2000 (CDMA2000) compliant network; generating a pseudo-random number (PN) sequence based on the hypothesis associated with a selected one of the Universal Mobile Telephony System (UMTS) compliant and Code-Division Multiple Access-2000 (CDMA2000) compliant communications networks; providing the PN sequence to the searcher to correlate with a received signal; adjusting the PN sequence to conform to the selected communications network; and correlating the adjusted PN sequence with the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A circuit comprising:
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a memory to store information relevant to hypotheses associated with at least two incompatible communications networks; sequence generator coupled to the memory, the sequence generator containing circuitry to generate a pseudo-random number (PN) sequences based on one of the hypotheses; a searcher coupled to the sequence generator, the searcher containing circuitry to correlate a PN sequence for a selected one of the communications networks generated by the sequence generator with a received signal and to accumulate results from the correlation; and a search controller coupled to the memory, the search controller containing circuitry to configure and control the operation of the searcher. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless receiver comprising:
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an analog front end coupled to an antenna, the analog front end containing circuitry to filter and amplify a received signal provided by the antenna; an analog-to-digital converter (ADC), the ADC to convert an analog signal provided by the analog front end into a digital symbol stream; and a digital signal processing section coupled to the ADC, the digital signal processing section containing circuitry to synchronize the wireless receiver with a communications network, comprising; a memory to store information relevant to a hypotheses associated with at least two incompatible communications networks; sequence generator coupled to the memory, the sequence generator containing circuitry to generate pseudo-random number (PN) sequences based on the hypotheses; a searcher coupled to the sequence generator, the searcher containing circuitry to correlate a PN sequence for a selected one of the communications networks generated by the sequence generator with a received signal and to accumulate results from the correlation; and a search controller coupled to the memory, the search controller containing circuitry to configure and control the operation of the searcher. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A method, comprising the steps of:
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storing information relevant to hypotheses associated with at least two incompatible communications networks; generating pseudo-random number (PN) sequences based on the hypotheses; correlating a PN sequence for a selected one of the communications networks generated by a sequence generator with a received signal and accumulating results from the correlation; and configuring and controlling the operation of a search controller coupled to a memory storing the relevant information.
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29. A method, comprising the steps of:
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providing an analog front end coupled to an antenna, the analog front end containing circuitry to filter and amplify a received signal provided by the antenna; providing an analog-to-digital converter (ADC), the ADC to convert an analog signal provided by the analog front end into a digital symbol stream; and providing a digital signal processing section coupled to the ADC, the digital signal processing section containing circuitry to synchronize the wireless receiver with a communications network, comprising; providing a memory to store information relevant to hypotheses associated with at least two incompatible communications networks; providing a sequence generator coupled to the memory, the sequence generator containing circuitry to generate pseudo-random number (PN) sequences based on the hypotheses; providing a searcher coupled to the sequence generator, the searcher containing circuitry to correlate a PN sequence for a selected one of the communications networks generated by the sequence generator with a received signal and to accumulate results from the correlation; and providing a search controller coupled to the memory, the search controller containing circuitry to configure and control the operation of the searcher.
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30. A method for detecting direct sequence spread spectrum signals with a searcher comprising:
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specifying a first hypothesis for a direct sequence spread spectrum signal from a first communications network; specifying a second hypothesis for a direct sequence spread spectrum signal from a second communications network; generating a pseudo-random number (PN) sequence based on the hypothesis associated with a selected one of the first and second communications networks, wherein a PN sequence for the first communications network is of a length different than the length of a PN sequence for the second communications network; providing the PN sequence to the searcher to correlate with a received signal; adjusting the PN sequence to conform to the selected communications network; and correlating the adjusted PN sequence with the received signal. - View Dependent Claims (31)
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Specification