SYSTEM FOR USING RAPID ACQUISITION SPREADING CODES FOR SPREAD-SPECTRUM COMMUNICATIONS
First Claim
1. A code division multiple access (CDMA) subscriber unit comprising:
- circuitry configured to establish a connection as part of an access procedure with a network by sending a first CDMA transmission;
wherein the first CDMA transmission is derived from first message bits and pilot bits;
wherein the first message bits are derived from a message used by the subscriber unit to initiate a connection with the network;
circuitry configured to receive a second CDMA transmission in response to the first CDMA transmission;
wherein the second CDMA transmission is derived from second message bits;
wherein the second message bits are derived from a message indicating connection setup information.
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Accused Products
Abstract
A system for rapidly acquiring a spreading code, used in a code division multiple access (CDMA) system, comprises a generator for generating a first long code and a second long code, with each long code having a length of N chips. The first long code is different from the second long code. A transmitter transmits the first long code and the second long code at a first phase angle and at a second phase angle, respectively, on a carrier signal over a communications channel using radio waves. The first long code and the second long code may be transmitted at an in-phase (I) angle and at a quadrature-phase (Q) angle, respectively, on the carrier signal. From the communications channel, an I acquisition circuit and a Q acquisition circuit may acquire, in parallel, the first long code and the second long code from the I angle and the Q angle, respectively, of the carrier signal by searching, in parallel, N/2 chips of the first long code and the second long code.
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Citations
28 Claims
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1. A code division multiple access (CDMA) subscriber unit comprising:
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circuitry configured to establish a connection as part of an access procedure with a network by sending a first CDMA transmission;
wherein the first CDMA transmission is derived from first message bits and pilot bits;
wherein the first message bits are derived from a message used by the subscriber unit to initiate a connection with the network;circuitry configured to receive a second CDMA transmission in response to the first CDMA transmission;
wherein the second CDMA transmission is derived from second message bits;
wherein the second message bits are derived from a message indicating connection setup information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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sending by a code division multiple access (CDMA) subscriber unit a first CDMA transmission to establish a connection as part of an access procedure;
wherein the first CDMA transmission is derived from first message bits and pilot bits;
wherein the first message bits are derived from a message used by the subscriber unit to initiate a connection with the network; andreceiving by the CDMA subscriber unit a second CDMA transmission in response to the first CDMA transmission and deriving a message indicating connection setup information from the second CDMA transmission. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification