SYSTEMS AND METHODS FOR ENHANCED-ISOLATION COEXISTING TIME-DIVISION DUPLEXED TRANSCEIVERS
First Claim
1. A system for enhancing isolation in coexisting first and second time-division duplexed (TDD) transceivers:
- 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.
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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.
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Citations
20 Claims
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1. A system for enhancing isolation in coexisting first and second time-division duplexed (TDD) transceivers:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification