Method and apparatus for identifying co-channel interference
AssigneeThe DIRECTV Group, Inc.
InventorsGuangcai Zhou, Ernest C. Chen, Joseph Santoru, Judith M. Wang
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Abstract
Methods and apparatuses identifying a co-channel interference signal in communications systems are disclosed. An exemplary method comprises generating an interference signal by subtracting a reconstructed desired signal from an at least partially demodulated composite signal, and generating synchronization statistics of interference signal using different scrambling codes. The interference signal is identified as the signal associated with the scrambling code that was used to generate an interference signal having a desired synchronization statistic.
Claims24
In a system receiving a composite signal comprising a desired signal having a desired frame including desired synchronization data and an interference signal, a method of receiving the desired signal and rejecting the interference signal, comprising the steps of:
- demodulating the composite signal;
- acquiring a phase of the desired synchronization data of the demodulated composite signal;
- tracking the acquired phase of the demodulated composite signal according to phase tracking information;
- sensing if the tracked phase of the demodulated composite signal is drawn away from the desired signal by the interference signal;
- and
- choosing whether to update the phase tracking information according to whether the tracked phase of the demodulated composite signal is sensed to be drawn away from the desired signal by the interference signal.
In a system receiving a composite signal comprising a desired signal having a desired frame including desired synchronization data and an interference signal, an apparatus for receiving the desired signal and rejecting the interference signal, comprising:
- a demodulator for demodulating the composite signal, acquiring a phase of the desired synchronization data of the demodulated composite signal, and for tracking the acquired phase of the demodulated composite signal according to phase tracking information;
- and
- a carrier synchronization module for sensing if the tracked phase of the demodulated composite signal is drawn away from the desired signal by the interference signal, and for choosing whether to update the phase tracking information according to whether the tracked phase of the demodulated composite signal is sensed to be drawn away from the desired signal by the interference signal.
In a system receiving a composite signal comprising a desired signal having a desired frame including desired synchronization data and an interference signal, an apparatus of receiving the desired signal and rejecting the interference signal, comprising the steps of:
- means for demodulating the composite signal;
- means for acquiring a phase of the desired synchronization data of the demodulated composite signal;
- means for tracking the acquired phase of the demodulated composite signal according to phase tracking information;
- means for sensing if the tracked phase of the demodulated composite signal is drawn away from the desired signal by the interference signal;
- and
- means for choosing whether to update the phase tracking information according to whether the tracked phase of the demodulated composite signal is sensed to be drawn away from the desired signal by the interference signal.
Dependencies are inferred from the claim text.