RADIO RECEIVER
Various apparatuses and methods are described to reduce interference in signals subject to intermodulation products and high power narrow band interfering signals on lower power wideband signals. Apparatuses and methods described herein also provide the capability for supporting multi-standards, multi-modes and multi-bands in wireless and wired applications with a single receiver or a receiver with minor variations. The receiver described herein samples the entire band in which there can be signals of interest or signals that can generate interference. All of these signals are sampled in one bit stream and the bit stream is processed to isolate signals of interest and interfering signals. The isolated interfering signals are then cancelled out of the signals of interest.
1 . A method comprising:
subjecting a wideband low amplitude signal to interference from a high amplitude narrow band signal; and
isolating the narrow band signal by digital filters and using the isolated narrow band to cancel the interference in the low amplitude wideband signal.
2 . The method of claim 1 wherein the narrow band signal is a frequency hopped signal and the phase and amplitude of each hopped frequency are stored and used when said each hopped frequency is used.
3 . The method of claim 2 further comprising adjusting the phase and amplitude of the narrowband signal to cause the interference to be reduced and storing the values for each frequency hop for use when said each frequency hop is used.
4 . The method of claim 2 a transmitter baseband processor providing the sequence of frequency hops, and a receiver using programmable digital decimating filters to isolate the wideband low amplitude signal and the narrow band high amplitude frequency hopped signals from the same over sampled bit stream of the receive band.
5 . The method of claim 4 further comprising using the isolated narrowband signal to process one service and using the signal to cancel the interference of the narrowband signal in the wideband signal.
6 . The method of claim 1 further comprising processing 802.11b/g and Bluetooth simultaneously and canceling the interference of the Bluetooth signal on the 802.11b/g.
7 . An apparatus comprising:
means for subjecting a wideband low amplitude signal to interference from a high amplitude narrow band signal; and
means for isolating the narrow band signal by digital filters and using the isolated narrow band to cancel the interference in the low amplitude wideband signal.