Radio receiver
First Claim
1. A method comprising:
- over-sampling, at a desired frequency, a passband of received signals to create a bitstream, wherein the received signals include signals of interest and interference generating signals, the interference generating signals capable of generating intermodulation products inband of the signals of interest;
isolating signals of interest in the bit stream using one or more decimating filters;
isolating source signals that generate one or more intermodulation products inband of the signal of interest using one ore more decimating filters;
computing an estimate of each of the one or more intermodulation products from the source signals that generate the one or more intermodulation products; and
canceling out one or more inband intermodulation products using the estimate of the intermodulation products.
4 Assignments
0 Petitions
Accused Products
Abstract
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.
-
Citations
129 Claims
-
1. A method comprising:
-
over-sampling, at a desired frequency, a passband of received signals to create a bitstream, wherein the received signals include signals of interest and interference generating signals, the interference generating signals capable of generating intermodulation products inband of the signals of interest;
isolating signals of interest in the bit stream using one or more decimating filters;
isolating source signals that generate one or more intermodulation products inband of the signal of interest using one ore more decimating filters;
computing an estimate of each of the one or more intermodulation products from the source signals that generate the one or more intermodulation products; and
canceling out one or more inband intermodulation products using the estimate of the intermodulation products. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 118, 119, 120, 121, 122)
-
-
11. The method defined in claim I wherein the signals of interest and interfacing signals are coherent after isolation.
-
27. An apparatus comprising:
-
means for over-sampling, at a desired frequency, a passband of received signals to create a bitstream, wherein the received signals include signals of interest and interference generating signals, the interference generating signals capable of generating intermodulation products inband of the signals of interest;
means for isolating signals of interest in the bit stream using one or more decimating filters; and
means for isolating source signals that generate one or more intermodulation products inband of the signal of interest using one ore more decimating filters;
means for computing an estimate of each of the one or more intermodulation products from the source signals that generate the one or more intermodulation products; and
means for canceling out one or more inband intermodulation products using the estimate of the intermodulation products. - View Dependent Claims (28, 29)
-
-
30. An apparatus comprising:
-
a sampling unit to sample, at a desired frequency, a passband of received signals to create a bitstream, wherein the received signals include signals of interest and interference generating signals, the interference generating signals capable of generating inter-modulation products inband of the signals of interest;
one or more filters to isolate signals of interest and interfering signals in the bitstream; and
a cancellation unit to cancel out isolated interference generated signals using estimations of the intermodulation products generated by the isolated interfering signals. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
-
-
46. A method comprising digitizing a full pass band into a bit stream;
- and
sending a copy of the bit stream to each of a plurality of filters to process multiple high resolution, narrow band, time coherent signals simultaneously. - View Dependent Claims (47, 48, 49, 50)
- and
-
51. An apparatus comprising:
-
means for digitizing a full pass band into a bit stream; and
means for sending a copy of the bit stream to each of a plurality of filters to process multiple high resolution, narrow band, time coherent signals simultaneously.
-
-
52. A method comprising:
-
outputting a pair of identical digital samples from a Sigma Delta A/C converter after sampling an IF signal with the Sigma Delta A/D converter;
applying a first decimating filter to one of the pair to perform a bandpass operation to obtain a signal of interest with in-band interference inter-modulation products;
applying a second decimating filter to the other of the pair to perform a band reject operation for the signal of interest to create out of band signals that are a source of the in-band interference inter-modulation products;
generating an estimate of in-band inter-modulation interference based on the out of band signals; and
adding an inverted version of the estimate of in-band inter-modulation interference to the signal of interest having the in-band interference inter-modulation products to cancel interference caused thereby and create a resulting signal. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
-
-
65. An apparatus comprising:
-
means for outputting a pair of identical digital samples from a Sigma Delta A/C converter after sampling an IF signal with the Sigma Delta A/D converter;
means for applying a first decimating filter to one of the pair to perform a bandpass operation to obtain a signal of interest with in-band interference inter-modulation products;
means for applying a second decimating filter to the other of the pair to perform a band reject operation for the signal of interest to create out of band signals that are a source of the inband interference inter-modulation products;
means for generating an estimate of in-band inter-modulation interference based on the out of band signals; and
means for adding an inverted version of the estimate of in-band inter-modulation interference to the signal of interest having the in-band interference inter-modulation products to cancel interference caused thereby and create a resulting signal. - View Dependent Claims (66)
-
-
67. An apparatus, comprising:
-
a sampling rate multiplier to sample a signal at a first sampling rate that is greater than a second sampling rate of a subsequent digital down conversion;
one or more decimating filters coupled to the sampling rate multiplier to filter digital data samples taken from the signal at the second sampling rate; and
a compensation cell coupled to the one or more decimating filters to reduce interference in a signal of interest prior to the subsequent digital down conversion. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82)
-
-
83. An apparatus comprising:
-
a converter to generate a pair of identical bit streams;
at least one decimating filter coupled to the converter to filter the bit streams from an intermediate frequency (IF) signal prior to application of a digital down conversion;
a low pass filter coupled to the decimating filter to filter the digital samples output from the decimating filter; and
an in-band interference compensation unit coupled to the low pass filter. - View Dependent Claims (84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117)
-
-
123. 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. - View Dependent Claims (124, 125, 126, 127, 128)
-
-
129. 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.
-
Specification