Communication device with code sequence and frequency selection system
First Claim
1. A Code Division Multiple Access (CDMA) communication system for reuse of available spreading codes, the system having a control spreading code and a control frequency and comprising:
- a first communication device for transmitting a signal having the control frequency and spread by the control spreading code, the signal includes a request for an optimum spreading code and an optimum operating frequency;
a second communication device, including;
a receiver for receiving the signal;
first means for identifying a first operating frequency optimum for the second communication device;
second means for identifying a first spreading code optimum for the reception of signals by the second communication device; and
a transmitter for transmitting the identity of the first spreading code and the first optimum operating frequency to the first communication device;
whereby the first and second communication devices communicate using the first operating frequency and the first spreading code.
1 Assignment
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Accused Products
Abstract
A code division multiple access (CDMA) communication system (10) for reuse of available spreading codes includes a first communication device (100) and a second communication device (106). The first and second communication devices (100, 106) are capable of identifying spreading codes and operating frequencies that are optimum for their respective radios. The identity of the optimum spreading code and the frequency of the optimum frequency is communicated from one communication device (100) to another (106), hence allowing the two devices to communicate with each other using their respective optimum codes and frequencies. These codes and frequencies may be periodically updated to provide reusability of codes. By dynamically updating codes and frequencies without the use of a central station, the efficiency and reusability of codes in the CDMA system (10) is significantly enhanced.
32 Citations
24 Claims
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1. A Code Division Multiple Access (CDMA) communication system for reuse of available spreading codes, the system having a control spreading code and a control frequency and comprising:
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a first communication device for transmitting a signal having the control frequency and spread by the control spreading code, the signal includes a request for an optimum spreading code and an optimum operating frequency; a second communication device, including; a receiver for receiving the signal; first means for identifying a first operating frequency optimum for the second communication device; second means for identifying a first spreading code optimum for the reception of signals by the second communication device; and a transmitter for transmitting the identity of the first spreading code and the first optimum operating frequency to the first communication device; whereby the first and second communication devices communicate using the first operating frequency and the first spreading code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a DS-CDMA communication system having at least a first and a second communication device, a method for providing communication between the first and the second communication devices with optimum reuse of spreading codes and available frequencies, comprising the steps of:
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in the first communication device; transmitting a signal to the second communication device requesting an optimum spreading code and an optimum operating frequency; in the second communication device; receiving the signal; identifying a first operating frequency optimum for the second communication device; identifying a first spreading code optimum for the second communication device; transmitting information about the first spreading code and the first operating frequency; and communicating with the first communication device using the first spreading code and the first operating frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A multi-channel CDMA communication device having a plurality of codes including a control code, comprising:
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a receiver for receiving a signal on a control channel and coded with the control code from a communication unit, the signal including a request for an optimum spreading code and an optimum operating frequency; first means for identifying the optimum operating frequency; second means for identifying the optimum spreading code; a transmitter for transmitting the optimum operating frequency and information about the optimum spreading code; and the receiver includes means for receiving signals on the optimum operating frequency and decoding signals spread by the optimum spreading code. - View Dependent Claims (22, 23, 24)
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Specification