Reliable decoding of a high-speed shared control channel
First Claim
1. A method for detecting a control channel message in a communication receiver, the method comprising:
- decoding messages transmitted over a plurality of shared control channels;
determining at least one likelihood metric for each of the decoded messages;
selecting a best candidate from the decoded messages, based on the likelihood metrics;
generating one or more additional candidate messages in addition to the decoded messages;
calculating additional likelihood metrics corresponding to the additional candidate messages; and
comparing the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the decoded messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message;
wherein the at least one likelihood metric for each of the decoded messages includes a decoder metric and a correlation value obtained by re-encoding the decoded message to obtain a re-encoded bit sequence and correlating the re-encoded bit sequence with a received sequence of soft values corresponding to the decoded message;
wherein calculating the additional likelihood metrics corresponding to the additional candidate messages comprises encoding the additional candidate messages and correlating the encoded the additional candidate messages with the received sequence of soft values to obtain the additional likelihood metrics;
wherein selecting the best candidate from the decoded messages comprises selecting the message corresponding to a best decoder metric;
wherein comparing the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message comprises comparing the correlation value for the best candidate to correlation values for the messages other than the best candidate and to the additional likelihood metrics.
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Abstract
Methods and apparatus are disclosed for detecting a control channel message transmitted on one of a plurality of shared control channels and targeted to a wireless receiver. In an exemplary method, messages transmitted over a plurality of shared control channels are decoded, and at least one likelihood metric is determined for each of the decoded messages. A best candidate is selected from the decoded messages, based on the likelihood metrics, and the at least one likelihood metric for the best candidate is compared to corresponding likelihood metrics for the messages other than the best candidate to determine whether the best candidate is a valid message. Wireless communication receivers configured correspondingly are also disclosed.
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Citations
18 Claims
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1. A method for detecting a control channel message in a communication receiver, the method comprising:
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decoding messages transmitted over a plurality of shared control channels; determining at least one likelihood metric for each of the decoded messages; selecting a best candidate from the decoded messages, based on the likelihood metrics; generating one or more additional candidate messages in addition to the decoded messages; calculating additional likelihood metrics corresponding to the additional candidate messages; and comparing the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the decoded messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message; wherein the at least one likelihood metric for each of the decoded messages includes a decoder metric and a correlation value obtained by re-encoding the decoded message to obtain a re-encoded bit sequence and correlating the re-encoded bit sequence with a received sequence of soft values corresponding to the decoded message; wherein calculating the additional likelihood metrics corresponding to the additional candidate messages comprises encoding the additional candidate messages and correlating the encoded the additional candidate messages with the received sequence of soft values to obtain the additional likelihood metrics; wherein selecting the best candidate from the decoded messages comprises selecting the message corresponding to a best decoder metric; wherein comparing the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message comprises comparing the correlation value for the best candidate to correlation values for the messages other than the best candidate and to the additional likelihood metrics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless communications receiver comprising one or more processing circuits configured to:
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decode messages transmitted over a plurality of shared control channels; determine at least one likelihood metric for each of the decoded messages; select a best candidate from the decoded messages, based on the likelihood metrics; generate one or more additional candidate messages in addition to the decoded messages; calculate additional likelihood metrics corresponding to the additional candidate messages; and compare the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message; wherein the at least one likelihood metric for each of the decoded messages includes a decoder metric and a correlation value obtained by re-encoding the decoded message to obtain a re-encoded bit sequence and correlating the re-encoded bit sequence with a received sequence of soft values corresponding to the decoded message; wherein the one or ore processing circuits are configured to calculate the additional likelihood metrics corresponding to the additional candidate messages by encoding the additional candidate messages and correlating the encoded additional candidate messages with the received sequence of soft values to obtain the additional likelihood metrics; wherein the one or more processing circuits are configured to select the best candidate from the decoded messages by selecting the message corresponding to a best decoder metric; and wherein the one or more processing circuits are configured to compare the at least one likelihood metric for the best candidate to the corresponding likelihood metrics for the messages other than the best candidate and to the additional likelihood metrics to determine whether the best candidate is a valid message by comparing the correlation value for the best candidate to correlation values for the messages other than the best candidate and to the additional likelihood metrics. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification