Systems and methods for enhanced-isolation coexisting time-division duplexed transceivers
First Claim
Patent Images
1. A system for enhancing isolation in coexisting first and second time-division duplexed (TDD) transceivers, comprising:
- a blocker canceller that, in a first operating mode, transforms a transmit signal of the first TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal of the second TDD transceiver;
wherein the transmit signal is transmitted in the first frequency band in the first operating mode;
wherein the receive signal is received in a second frequency band non-identical to the first frequency band in the first operating mode;
a first tunable bandpass filter that, in the first operating mode, filters the blocker cancellation signal to remove noise in the second frequency band generated by the blocker canceller;
a second tunable bandpass filter that, in the first operating mode, filters the transmit signal to remove power in the first frequency band; and
a transmit-noise canceller that, in the first operating mode transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal of the second TDD transceiver;
wherein the system, in the first operating mode, combines the filtered blocker cancellation signal and the transmit-noise cancellation signal with the receive signal of the second TDD transceiver, resulting in generation of a reduced-interference receive signal;
wherein the system is switchable from the first operating mode to a second operating mode;
wherein, in the second operating mode;
the blocker canceller transforms a transmit signal of the second TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal of the first TDD transceiver;
wherein the transmit signal is transmitted in the second frequency band;
wherein the receive signal is received in the first frequency band;
the second tunable bandpass filter filters the blocker cancellation signal to remove noise in the first frequency band generated by the blocker canceller;
the first tunable bandpass filter filters the transmit signal to remove power in the second frequency band;
the transmit-noise canceller transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal of the first TDD transceiver; and
the system combines the filtered blocker cancellation signal and the transmit-noise cancellation signal with the receive signal of the first TDD transceiver, resulting in generation of a reduced-interference receive signal.
6 Assignments
0 Petitions
Accused Products
Abstract
A system for enhancing isolation in coexisting time-division duplexed (TDD) transceivers includes: a blocker canceller that transforms a transmit signal of a TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal; a first filter that filters the blocker cancellation signal; a second filter that filters the transmit signal; and a transmit-noise canceller that transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal.
-
Citations
19 Claims
-
1. A system for enhancing isolation in coexisting first and second time-division duplexed (TDD) transceivers, comprising:
-
a blocker canceller that, in a first operating mode, transforms a transmit signal of the first TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal of the second TDD transceiver;
wherein the transmit signal is transmitted in the first frequency band in the first operating mode;
wherein the receive signal is received in a second frequency band non-identical to the first frequency band in the first operating mode;a first tunable bandpass filter that, in the first operating mode, filters the blocker cancellation signal to remove noise in the second frequency band generated by the blocker canceller; a second tunable bandpass filter that, in the first operating mode, filters the transmit signal to remove power in the first frequency band; and a transmit-noise canceller that, in the first operating mode transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal of the second TDD transceiver; wherein the system, in the first operating mode, combines the filtered blocker cancellation signal and the transmit-noise cancellation signal with the receive signal of the second TDD transceiver, resulting in generation of a reduced-interference receive signal;
wherein the system is switchable from the first operating mode to a second operating mode;
wherein, in the second operating mode;the blocker canceller transforms a transmit signal of the second TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal of the first TDD transceiver;
wherein the transmit signal is transmitted in the second frequency band;
wherein the receive signal is received in the first frequency band;the second tunable bandpass filter filters the blocker cancellation signal to remove noise in the first frequency band generated by the blocker canceller; the first tunable bandpass filter filters the transmit signal to remove power in the second frequency band; the transmit-noise canceller transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal of the first TDD transceiver; and the system combines the filtered blocker cancellation signal and the transmit-noise cancellation signal with the receive signal of the first TDD transceiver, resulting in generation of a reduced-interference receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A system for enhancing isolation in coexisting first and second time-division duplexed (TDD) transceivers, comprising:
-
a blocker canceller that, in a first operating mode, transforms a transmit signal of the first TDD transceiver into a blocker cancellation signal configured to remove transmit-band interference in a receive signal of the second TDD transceiver;
wherein the transmit signal is transmitted in the first frequency band in the first operating mode;
wherein the receive signal is received in a second frequency band non-identical to the first frequency band in the first operating mode;a first tunable bandpass filter that, in the first operating mode, filters the blocker cancellation signal to remove noise in the second frequency band generated by the blocker canceller; a second tunable bandpass filter that, in the first operating mode, filters the transmit signal to remove power in the first frequency band; and a transmit-noise canceller that, in the first operating mode transforms the filtered transmit signal into a transmit noise cancellation signal configured to remove receive-band interference in the receive signal of the second TDD transceiver; wherein the system, in the first operating mode, combines the filtered blocker cancellation signal and the transmit-noise cancellation signal with the receive signal of the second TDD transceiver, resulting in generation of a reduced-interference receive signal;
further comprising a local oscillator exchanger;
wherein, in the first operating mode, the transmit signal is received at the second tunable bandpass filter after power amplification by the first TDD transceiver;
wherein, in the first operating mode, a receive chain of the first TDD transceiver is used, along with the local oscillator exchanger, to convert the filtered transmit signal to a digital filtered transmit signal;
wherein the transmit-noise canceller transforms the digital filtered transmit signal to generate a digital transmit noise cancellation signal;
wherein, in the first operating mode, the digital transmit noise cancellation signal is combined with the receive signal of the second TDD transceiver after analog-to-digital conversion of the receive signal to reduce transmit noise interference in the receive signal.- View Dependent Claims (14, 15, 16, 17, 18, 19)
-
Specification