Full duplex radio in wireless tunneling system
Disclosed wireless tunneling system includes two wireless tunneling apparatuses that communicate with each other through the wireless link. A local wireless tunneling apparatus is coupled to a local processing apparatus through a wired connection and a remote wireless tunneling apparatus is coupled to the remote processing apparatus through another wired connection. The two processing apparatuses bi-directionally communicate with each other through the wireless link using the two wireless tunneling apparatuses as if the two processing apparatuses were connected through a wired connection.
1. A full-duplex transceiver comprising:
a local wireless transmitter coupled to a local transmit antenna having a first polarization, the local wireless transmitter configured to transmit a local transmit wireless signal through the local transmit antenna at a carrier frequency; and
a local wireless receiver coupled to a local receive antenna having a second polarization different from the first polarization, the local wireless receiver configured to receive a local receive wireless signal through the local receive antenna on the carrier frequency, the local receive wireless signal received concurrently with transmission of the local transmit wireless signal, wherein the local wireless receiver comprises a clock and data recovery circuit to (i) receive a local receive baseband signal derived from the local wireless receive signal, (ii) perform timing recovery on the local receive baseband signal, (iii) recover a digital representation of the local receive baseband signal that is synchronous to a local clock of the recovered digital representation, and (iv) generate a data signal comprising the recovered digital representation,
wherein the local wireless transmitter, the local wireless receiver, the local transmit antenna, and the local receive antenna are integrated on a same package;
wherein the clock and data recovery circuit operates at a first baseband frequency to obtain the data signal, and
wherein the local wireless receiver further comprises a baseband receiving circuit, the baseband receiving circuit operating at a second baseband frequency lower than the first baseband frequency to receive the local receive baseband signal and to generate another data signal based on the local receive baseband signal.
2. The full-duplex transceiver of claim 1 , wherein the local wireless receiver comprises:
a demodulator to demodulate a local receive wireless signal to a local receive baseband signal.
3. The full-duplex transceiver of claim 2 , wherein the demodulator comprises an on-off keying demodulator.
4. The full-duplex transceiver of claim 2 , wherein the demodulator comprises an envelope detector without employing a synthesizer to demodulate the local receive wireless signal.
5. The full-duplex transceiver of claim 1 , wherein a data rate of the data signal is at least 1 Gbps.
6. The full-duplex transceiver of claim 1 , wherein a distance between the local transmit antenna and the local receive antenna is less than 10 millimeters.
7. The full-duplex transceiver of claim 1 , wherein the carrier frequency is above 20 GHz.
8. The full-duplex transceiver of claim 1 , wherein the local wireless transmitter comprises:
a transmit baseband circuit to obtain a local transmit baseband signal based on an input local data signal received from a local source apparatus; and
a transmit modulator to modulate the carrier signal to generate a local transmit wireless signal centered at the carrier frequency according to the local transmit baseband signal.
9. The full-duplex transceiver of claim 8 , wherein the transmit modulator comprises an on-off keying modulator to modulate the carrier signal using on-off keying.
10. The full-duplex transceiver of claim 8 , wherein the local wireless transmitter further comprises:
a duobinary encoder to perform duobinary encoding the local transmit data signal to produce a local recoded transmit digital signal with three possible levels: a zero level and two non-zero levels with opposite signs.
11. A method for operating a full-duplex transceiver, the method comprising:
transmitting, by a local wireless transmitter, a local transmit wireless signal having a carrier frequency through a local transmit antenna that applies a first polarization to the local transmit wireless signal;
receiving, by a local wireless receiver through a local receive antenna that is integrated on a same package as the local wireless receiver, the local wireless transmitter and the local transmit antenna, a local receive wireless signal having the carrier frequency and having a second polarization different than the first polarization;
wherein the local wireless receiver comprises a clock and data recovery circuit to (i) receive a local receive baseband signal derived from the local wireless receive signal, (ii) perform timing recovery on the local receive baseband signal, (iii) recover a digital representation of the local receive baseband signal that is synchronous to a local clock of the recovered digital representation, and (iv) generate a data signal comprising the recovered digital representation,
wherein the clock and data recovery circuit operates at a first baseband frequency to obtain the data signal; and
wherein the local wireless receiver further comprises a baseband receiving circuit, the baseband receiving circuit operating at a second baseband frequency lower than the first baseband frequency to receive the local receive baseband signal and to generate another data signal based on the local receive baseband signal.
12. The method of claim 11 , further comprising:
demodulating, by a demodulator of the local wireless receiver, the local receive wireless signal to generate a local receive baseband signal.
13. The method of claim 12 , wherein demodulating the local receive wireless signal comprising applying on-off keying demodulation.
14. The method of claim 12 , wherein demodulating the local receive wireless signal comprises applying an envelope detector to the local receive wireless signal without employing a synthesizer.
15. The method of claim 11 , further comprising:
receiving, by a clock and data recovery circuit, a local receive baseband signal derived from the local wireless receive signal;
performing, by the clock and data recovery circuit, timing recovery on the local receive baseband signal;
recovering, by the clock and data recovery circuit, a digital representation of the local receive baseband signal that is synchronous to a local clock of the recovered digital representation;
and generating, by the clock and data recovery circuit, a data signal comprising the recovered digital representation.
16. The method of claim 15 , wherein a data rate of the data signal is at least 1 Gbps.
17. The method of claim 11 , wherein a distance between the local transmit antenna and the local receive antenna is less than 10 millimeters.
18. The method of claim 11 , wherein the carrier frequency is above 20 GHz.