System and method for TDD-FDD duplexing in a radio architecture
First Claim
1. A multiplexer comprising:
- a first band pass filter having a first frequency passband and a first port for coupling to a transmitter for the first frequency passband;
a second band pass filter having a second frequency passband and a first port for coupling to a transmitter for the second frequency passband;
a third band pass filter having a third frequency passband that is offset from the second frequency passband, and a first port for coupling to a receiver for the third frequency passband;
a fourth band pass filter having a fourth frequency passband, and a first port for coupling to a receiver for the fourth frequency passband; and
a switch for coupling an antenna to;
when operating in a time division duplexing (TDD) mode;
a second port of the first band pass filter in a first switch position during signal transmitting; and
a second port of the fourth band pass filter in a third switch position during signal receiving; and
when operating in a frequency division duplexing (FDD) mode;
both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position.
2 Assignments
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Accused Products
Abstract
A reconfigurable TDD-FDD multiplexer operates in a TDD mode and a FDD mode. The TDD-FDD multiplexer includes an interdigital quadruplexer in series with a one-pole three-throw RF switch. The interdigital quadruplexer includes of two V-band filters, connectable to a transmitter and a receiver, respectively, for TDD mode duplexing, and two E-band filters, connectable to a transmitter and a receiver, respectively, for FDD mode duplexing. The E-band filters include an E-band transmitting filter that passes an E-band transmitting frequency band, and an E-band receiving filter that passes for an E-band receiving frequency band offset from the E-band transmitting frequency band. Switching between the V-band receiving filter and V-band transmitting filter enables TDD duplexing functionality at V-band frequencies. Switching to the two E-band filters enables FDD duplexing functionality at E-band frequencies.
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Citations
20 Claims
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1. A multiplexer comprising:
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a first band pass filter having a first frequency passband and a first port for coupling to a transmitter for the first frequency passband; a second band pass filter having a second frequency passband and a first port for coupling to a transmitter for the second frequency passband; a third band pass filter having a third frequency passband that is offset from the second frequency passband, and a first port for coupling to a receiver for the third frequency passband; a fourth band pass filter having a fourth frequency passband, and a first port for coupling to a receiver for the fourth frequency passband; and a switch for coupling an antenna to; when operating in a time division duplexing (TDD) mode; a second port of the first band pass filter in a first switch position during signal transmitting; and a second port of the fourth band pass filter in a third switch position during signal receiving; and when operating in a frequency division duplexing (FDD) mode; both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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determining whether to operate in a time-division duplexing (TDD) mode or a frequency division duplexing (FDD) mode; when the determination is to operate in the TDD mode; during signal transmitting, coupling an antenna to a transmitter for a first frequency passband via a first band pass filter having the first frequency passband; during signal receiving, coupling the antenna to a receiver for a fourth frequency passband via a fourth band pass filter having the fourth frequency passband; and when the determination is to operate in the FDD mode, simultaneously coupling the antenna to a transmitter for a second frequency passband via a second band pass filter having the second frequency passband and to a receiver for a third frequency passband via a third band pass filter having the third frequency passband offset from the second frequency passband. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification