Patent ID: 9209937
Filing Date: 2015-12-08
Classification: H03M,H04L

Abstract:
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.