Adaptive correlation of access codes in a packet-based communication system
AssigneeEricsson Technology Licensing AB
InventorJacobus C. Haartsen
Life of this patent
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Abstract
Whether to indicate reception of an access code in a receiver operating in a communications system is determined by receiving a signal and generating a correlation value by correlating the received signal with a reference code. A threshold level is set to a first value if the receiver is in a scan mode. The threshold level is set to a second value if the receiver is in a traffic mode, wherein the second value corresponds to a lower degree of correlation than the first value. The correlation value is compared with the threshold level. Reception of the access code is indicated only if the correlation value compares favorably with the threshold level.
Claims47
A method of determining whether to indicate reception of an access code in a receiver operating in a communications system, comprising:
- receiving a signal;
- generating a correlation value by correlating the received signal with a reference code;
- setting a threshold level to a first value if the receiver is in a scan mode;
- setting the threshold level to a second value if the receiver is in a traffic mode, wherein the second value corresponds to a lower degree of correlation than the first value;
- comparing the correlation value with the threshold level;
- and
- indicating reception of the access code only if the correlation value compares favorably with the threshold level.
An apparatus for determining whether to indicate reception of an access code in a receiver operating in a communications system, comprising:
- logic that receives a signal;
- logic that generates a correlation value by correlating the received signal with a reference code;
- logic that sets a threshold level to a first value if the receiver is in a scan mode;
- logic that sets the threshold level to a second value if the receiver is in a traffic mode, wherein the second value corresponds to a lower degree of correlation than the first value;
- logic that compares the correlation value with the threshold level;
- and
- logic that indicates reception of the access code only if the correlation value compares favorably with the threshold level.
A computer readable carrier having stored thereon one or more instructions for causing a processor to determine whether to indicate reception of an access code in a receiver operating in a communications system, wherein the one or more instructions cause the processor to perform:
- receiving a signal;
- generating a correlation value by correlating the received signal with a reference code;
- setting a threshold level to a first value if the receiver is in a scan mode;
- setting the threshold level to a second value if the receiver is in a traffic mode, wherein the second value corresponds to a lower degree of correlation than the first value;
- comparing the correlation value with the threshold level;
- and indicating reception of the access code only if the correlation value compares favorably with the threshold level.
Dependencies are inferred from the claim text.