Dragonwave Inc.

4472314 Canada Inc.

Keith Morris

Interference carrier regeneration and interference cancellation involve generating a Cross Polarization Interference Cancellation (XPIC) error signal representative of a difference between a first signal derived from a first communication signal that is received over a wireless communication link and a first symbol decision that is based on the first signal. The first communication signal is affected by interference from a second communication signal, on an orthogonal polarization channel of the same nominal frequency channel, for example. Based on the XPIC error signal and a second symbol decision for the second communication signal, a carrier of interference affecting the first signal from the second communication signal is regenerated. A rotation and derotation arrangement rotates a cross-channel interference signal and derotates a main channel equalizer feedback signal based on the regenerated interference carrier. The derotated main channel equalizer feedback signal can be provided as a feedback signal to a cross-channel interference equalizer.

Interference carrier regeneration and interference cancellation apparatus and methods

Communication signal symbol timing error detection and recovery apparatus and techniques are disclosed. A communication signal that includes symbols is sampled according to receive symbol timing. The samples are band-edge filtered to provide a filtered output signal including band edges of the samples. The filtered output signal is converted to baseband, and a phase error of the receive symbol timing is calculated based on the down converted baseband signal. The communication signal may include symbols associated with quadrature channels, in which case a respective filtered output signal that includes band edges of samples associated with each quadrature channel may be down converted. The down converted baseband signals may then be separated into upper and lower band-edge signals, which are used to calculate a phase error of the receive symbol timing. The upper and lower band-edge signals may also be used for other purposes, such as slope equalization and/or carrier synchronization.

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Arnprior, Canada

Keith Morris