Patent ID: 8295415
Filing Date: 2012-10-23
Classification: H04B,H04J

Abstract:
1. A method of evaluating usage in a received signal of codes from a tree of codes adapted for use to orthogonalise communications signals, the method comprising: testing to determine if a given code is in use in the received signal; analyzing the testing and the tree to determine if a second testing of the received signal for additional codes in a portion of the tree depending from the given code is required; concluding that the given code and its subtree codes are blocked from use if the given code is determined to be in use; when the testing determines the given code is unused, making at least one prediction related to usage of codes in the portion based at least in part on a value indicative of a signal power associated with the given code; and for a given time frame, selecting, as the given code for testing, a code that was employed in a previous time frame, and then performing the method only on a subset of the codes from the tree of codes, wherein the method is applied upon a determination that the received signal is being subjected to a high level of interference.