Transmitter crosstalk cancellation in multi-standard wireless transceivers
First Claim
1. A method comprising;
- providing at least a receiver for receiving signals according to a first wireless standard, the receiver comprising at least one band-limiting filter of a plurality of band-limiting filters;
providing at least a transmitter for transmitting a transmit signal according to a second other wireless standard;
providing a first signal for transmission from the transmitter;
generating a first cancellation signal, the first cancellation signal being at least a portion of the transmit signal and having at least one of a predetermined time delay, predetermined amplitude relationship, and predetermined phase relationship with respect to the transmit signal;
providing the first cancellation signal by other than the transmitter, the first cancellation signal for combining with a received signal received at the receiver; and
generating a control signal, the control signal for controlling an aspect of the generation of the first cancellation signal and being generated in dependence upon a measure of the received signal power after filtering thereof by the band-limiting filters.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of suppressing interference from a transmitter operating to a first standard to a local receiver operating to a second standard is provided. Such interference being increasingly common as a result of the deployment of multiple wireless transceivers within electronic devices supporting multiple international standards, such as WiFi and WiMAX. Advantageously, the invention presents a means of actively cancelling interference both from transmitters operating within the same frequency range as defined by the standard as well as those operating in different frequency ranges. The active cancellation accordingly allows improved performance for systems with very low received signal powers, such as GPS, in addition to wireless data communications standards. An exemplary embodiment providing active cancellation through delaying a portion of the transmitted signal and adjusting both the amplitude and phase by means of polar modulation prior to summing this signal with the detected signal to provide a receive signal within which the transmit signal is nulled.
128 Citations
55 Claims
-
1. A method comprising;
-
providing at least a receiver for receiving signals according to a first wireless standard, the receiver comprising at least one band-limiting filter of a plurality of band-limiting filters; providing at least a transmitter for transmitting a transmit signal according to a second other wireless standard; providing a first signal for transmission from the transmitter; generating a first cancellation signal, the first cancellation signal being at least a portion of the transmit signal and having at least one of a predetermined time delay, predetermined amplitude relationship, and predetermined phase relationship with respect to the transmit signal; providing the first cancellation signal by other than the transmitter, the first cancellation signal for combining with a received signal received at the receiver; and generating a control signal, the control signal for controlling an aspect of the generation of the first cancellation signal and being generated in dependence upon a measure of the received signal power after filtering thereof by the band-limiting filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 30, 40, 41)
-
-
25. A circuit comprising;
-
at least a receiver for receiving signals according to a first wireless standard, the receiver comprising at least one band-limiting filter of a plurality of band-limiting filters; at least a transmitter for transmitting a transmit signal according to a second other wireless standard; a first cancellation signal generating circuit for generating a first cancellation signal in response to a control signal, the first cancellation signal being at least a portion of the transmit signal and having at least one of a predetermined time delay, predetermined amplitude relationship, and predetermined phase relationship with respect to the transmit signal; a transmission path for providing the first cancellation signal by other than the transmitter, the first cancellation signal for combining with a received signal received at the receiver; and a control signal output port for providing the control signal for controlling an aspect of the generation of the first cancellation signal and being generated in dependence upon a measure of the received signal power after filtering thereof by the band-limiting filters. - View Dependent Claims (26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
-
-
52. A computer readable medium having stored therein data according to a predetermined computing device format, and upon execution of the data by a suitable computing device a method of improving a receiver is provided, comprising:
-
providing at least a receiver for receiving signals according to a first wireless standard, the receiver comprising at least one band-limiting filter of a plurality of band-limiting filters; providing at least a transmitter for transmitting a transmit signal according to a second other wireless standard; providing a first signal for transmission from the transmitter; generating a first cancellation signal, the first cancellation signal being at least a portion of the transmit signal and having at least one of a predetermined time delay, predetermined amplitude relationship, and predetermined phase relationship with respect to the transmit signal; providing the first cancellation signal by other than the transmitter, the first cancellation signal for combining with a received signal received at the receiver; generating a control signal, the control signal for controlling an aspect of the generation of the first cancellation signal and being generated in dependence upon a measure of the received signal power after the band limiting filters. - View Dependent Claims (53)
-
-
54. A computer readable medium having stored therein data according to a predetermined computing device format, and upon execution of the data by a suitable computing device a circuit is provided, comprising:
-
at least a receiver for receiving signals according to a first wireless standard, the receiver comprising at least one band-limiting filter of a plurality of band-limiting filters; at least a transmitter for transmitting a transmit signal according to a second other wireless standard; a first cancellation signal generating circuit for generating a first cancellation signal in response to a control signal, the first cancellation signal being at least a portion of the transmit signal and having at least one of a predetermined time delay, predetermined amplitude relationship, and predetermined phase relationship with respect to the transmit signal; a transmission path for providing the first cancellation signal by other than the transmitter, the first cancellation signal for combining with a received signal received at the receiver; and a control signal output port for providing the control signal for controlling an aspect of the generation of the first cancellation signal and being generated in dependence upon a measure of the received signal power after filtering thereof by the band-limiting filters. - View Dependent Claims (55)
-
Specification