Bidirectional wireless communication system, wireless communication apparatus, and bidirectional wireless communication method

• US 20110075595A1
• Filed: 09/10/2010
• Published: 03/31/2011
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Uno, Masahiro
• Granted Patent: US 8,432,839 B2
• Time in Patent Office: Days
• US Class Current: 370/281
• CPC Class Codes: H03J 1/0008 using a central processing unit, e.g. a microprocessor digital tuning in general H03J5/0245
• CPC Class Codes: H03L 7/24 using a reference signal directly applied to the generator
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication

Abstract

A bidirectional wireless communication system includes: a first wireless communication apparatus for bidirectional communication configured to multiplex a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, and transmit a resultant transmission signal; and a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from the first wireless communication apparatus into the oscillator, receive the reception signal while variably controlling the free-running oscillation frequency of the oscillator of the second wireless communication apparatus, detect whether the free-running oscillation frequency of the signal of the oscillator of the second wireless communication apparatus has entered the frequency range up to the injection locking to be frequency-locked with a carrier frequency of the injected reception signal, and generate a communication enable signal.

Claims

1. A bidirectional wireless communication system, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking;

said bidirectional wireless communication system comprising;

a first wireless communication apparatus for bidirectional communication configured to multiplex a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, and transmit a resultant transmission signal; and

a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from said first wireless communication apparatus into said oscillator, receive said reception signal while variably controlling the free-running oscillation frequency of said oscillator of said second wireless communication apparatus, detect whether the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with a carrier frequency of the injected reception signal, and generate a communication enable signal;

wherein,

if the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus is found frequency-locked with the carrier frequency of the injected reception signal, said second wireless communication apparatus transmits said communication enable signal to said first wireless communication apparatus.

2. The bidirectional wireless communication system according to claim 1, wherein

said first wireless communication apparatus has a single oscillator and said second wireless communication apparatus has a single oscillator,

said oscillator of the first wireless communication apparatus is sharably used by a reception section and a transmission section thereof,

said transmission section of said first wireless communication apparatus executes transmission processing on the basis of a carrier signal having a predetermined oscillation frequency oscillated by said oscillator of said first wireless communication apparatus,

said reception section of said first wireless communication apparatus executes reception processing on the basis of a local oscillator signal obtained by multiplying said carrier signal oscillated by said oscillator of said first wireless communication apparatus,

said oscillator of said second wireless communication apparatus is sharably used by a reception section and a transmission section thereof,

said reception section of said second wireless communication apparatus executes reception processing on the basis of a local oscillation signal having a free-running oscillation frequency after injection locking oscillated by said oscillator of said second wireless communication apparatus, and

said transmission section of said second wireless communication apparatus executes transmission processing on the basis of a carrier signal obtained by multiplying said local oscillation frequency signal after injection locking oscillated by said oscillator of said second wireless communication apparatus.

3. The bidirectional wireless communication system according to claim 2, wherein, in the carrier frequency in said transmission section of said first wireless communication apparatus and the carrier frequency in said transmission section of said second wireless communication apparatus, a relation of M/N, M and N being each an integer, is set between the carrier frequency of said first wireless communication apparatus and the carrier frequency of said second wireless communication apparatus.

4. The bidirectional wireless communication system according to claim 3, wherein

a plurality of transmission sections having different carrier frequencies are arranged in said second wireless communication apparatus,

a plurality of uplink signal transmission channels to said first wireless communication apparatus are configured from said second wireless communication apparatus, and

all of carrier frequencies of said plurality of uplink signal transmission channel are generated by a single oscillator.

5. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a mate wireless communication apparatus that has an oscillator configured to oscillate a signal having a free-running oscillation frequency in which a received reception signal is injected in said oscillator, receives said reception signal while variably controlling the free-running oscillation frequency of said oscillator, detects whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal, and generates a communication enable signal;

said wireless communication apparatus comprising;

a transmission section configured to multiplex a modulated signal obtained by modulating an input signal with a reference carrier signal having a predetermined carrier frequency and transmit a resultant transmission signal to said mate wireless communication apparatus; and

a reception section configured to receive said communication enable signal from said mate wireless communication apparatus if the free-running oscillation frequency of the signal of said oscillator of said mate wireless communication apparatus is found entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

6. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a wireless communication apparatus on the transmission side that multiplexes a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, transmits a resultant transmission signal, and receives at least a communication enable signal;

said wireless communication apparatus comprising;

a reception section configured to have an oscillator configured to oscillate a signal having a free-running oscillation frequency, inject a reception signal received from said wireless communication apparatus on the transmission side into said oscillator, and receive said reception signal while variably controlling the free-running oscillation frequency of said oscillator;

a signal generation block configured to detect whether the free-running oscillation frequency of the signal of said oscillator has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal and generate a communication enable signal; and

a transmission section configured to transmit said communication enable signal generated by said signal generation block to said wireless communication apparatus on the transmission side.

7. The wireless communication apparatus according to claim 6, wherein

said reception section has

a control block configured to reception-control said reception signal while variable controlling the free-running oscillation frequency of said oscillator and

a frequency locking detection block configured to generate a communication enable signal by detecting whether the free-running oscillation frequency of the signal of said oscillator that is variably controlled by said control block has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

8. The wireless communication apparatus according to claim 7, wherein said control block has

an up-counter and/or a down-counter,

said up-counter and/or said down-counter repetitively increasing and decreasing, within the frequency range up to said injection locking, the oscillation frequency of the signal oscillated by said oscillator for variable tuning.

9. The wireless communication apparatus according to claim 7, wherein

said frequency locking detection block has

a frequency discriminator configured to convert a frequency variation of a demodulated signal obtained by demodulating said reception signal into an amplitude value and outputting said amplitude value;

and

a comparator configured to compare the amplitude value obtained by said frequency discriminator with a preset comparison reference value to determine whether the free-running oscillation frequency of the signal of said oscillator has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

10. A bidirectional wireless communication method, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking,

said bidirectional wireless communication method comprising the steps of:

in a first wireless communication apparatus for bidirectional communication, multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal;

in a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, injecting a reception signal received from said first wireless communication apparatus into said oscillator, receiving said reception signal while variably controlling the free-running oscillation frequency of said oscillator of said second wireless communication apparatus, detecting whether the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with a carrier frequency of the injected reception signal, and generating a communication enable signal; and

if the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus is found frequency-locked with the carrier frequency of the injected reception signal, transmitting said communication enable signal to said first wireless communication apparatus.

11. A bidirectional wireless communication system, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking,

said bidirectional wireless communication system comprising:

a first wireless communication apparatus for bidirectional communication configured, when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, and transmitting a resultant transmission signal, to transmit said transmission signal while variably controlling the carrier frequency of said reference carrier signal; and

a second wireless communication apparatus, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from said first wireless communication apparatus into said oscillator, detect whether the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with a carrier frequency of the injected reception signal, generate a communication enable signal, and

if the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus is found frequency-locked with the carrier frequency of the injected reception signal, transmit said communication enable signal to said first wireless communication apparatus.

12. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a mate wireless communication apparatus that has an oscillator configured to oscillate a signal having a free-running oscillation frequency in which a received reception signal is injected in said oscillator, receives said reception signal while variably controlling the free-running oscillation frequency of said oscillator, detects whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal, and, generates a communication enable signal;

said wireless communication apparatus comprising;

a transmission section configured, when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal to said mate wireless communication apparatus, to transmit said transmission signal while variably controlling the carrier frequency of said reference carrier signal; and

a reception section configured to receive a communication enable signal from said mate wireless communication apparatus when the free-running oscillation frequency of the signal of said oscillator of said mate wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

13. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a wireless communication apparatus on the transmission side that transmits a resultant transmission signal while variably controlling the carrier frequency of said reference carrier signal and receives at least a communication enable signal when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal;

said wireless communication apparatus comprising;

a reception section, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, configured to inject a reception signal received from said wireless communication apparatus on the transmission side into said oscillator and receive said reception signal;

a signal generation block configured to detect whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal and generate a communication enable signal; and

a transmission section configured to transmit said communication enable signal generated by said signal generation block to said wireless communication apparatus on the transmission side.

14. A bidirectional wireless communication method, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking,

said bidirectional wireless communication method comprising the steps of:

when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal, transmitting, by a first wireless communication apparatus for bidirectional communication, said transmission signal while variably controlling the carrier frequency of said reference carrier signal;

injecting, by a second wireless communication apparatus having an oscillator configured to oscillate a signal having a free-running oscillation frequency, a reception signal received from said first wireless communication apparatus into said oscillator of said second wireless communication apparatus, detecting whether the free-running oscillation frequency of the signal of said oscillator of said second wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal, and generating a communication enable signal; and

if the free-running oscillation frequency of the signal of the oscillator is found frequency-locked with the carrier frequency of the injected reception signal, transmitting said communication enable signal to said first wireless communication apparatus.

15. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a mate wireless communication apparatus that has an oscillator for oscillating a signal having a free-running oscillation frequency in which a received reception signal is injected in said oscillator, receives said reception signal while variably controlling the free-running oscillation frequency of said oscillator, detects whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal, and generates a communication enable signal;

said wireless communication apparatus comprising;

transmission means for multiplexing a modulated signal obtained by modulating an input signal with a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal to said mate wireless communication apparatus; and

reception means for receiving said communication enable signal from said mate wireless communication apparatus if the free-running oscillation frequency of the signal of said oscillator of said mate wireless communication apparatus is found entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

16. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a wireless communication apparatus on the transmission side that multiplexes a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency, transmits a resultant transmission signal, and receives at least a communication enable signal;

said wireless communication apparatus comprising;

reception means, having an oscillator for oscillating a signal having a free-running oscillation frequency, for injecting a reception signal received from said wireless communication apparatus on the transmission side into said oscillator, and receiving said reception signal while variably controlling the free-running oscillation frequency of said oscillator;

signal generation means for detecting whether the free-running oscillation frequency of the signal of said oscillator has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal and generating a communication enable signal; and

transmission means for transmitting said communication enable signal generated by said signal generation means to said wireless communication apparatus on the transmission side.

17. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a mate wireless communication apparatus that has an oscillator configured to oscillate a signal having a free-running oscillation frequency in which a received reception signal is injected in said oscillator, receives said reception signal while variably controlling the free-running oscillation frequency of said oscillator, detects whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal, and, generates a communication enable signal;

said wireless communication apparatus comprising;

transmission means for, when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal to said mate wireless communication apparatus, transmitting said transmission signal while variably controlling the carrier frequency of said reference carrier signal; and

reception means for receiving a communication enable signal from said mate wireless communication apparatus when the free-running oscillation frequency of the signal of said oscillator of said mate wireless communication apparatus has entered the frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal.

18. A wireless communication apparatus, letting

a phenomenon in which injecting a signal having a frequency in the proximity of an oscillation frequency into an oscillator causes the oscillation frequency of said oscillator to be pulled in the frequency of the injected signal be injection locking and

another phenomenon in which, when the oscillation frequency of the signal oscillated by said oscillator enters a frequency range up to said injection locking, the oscillation frequency of the signal of said oscillator is locked with the frequency of the injected signal by the pull-in phenomenon of said injection locking be frequency locking, and

executing wireless communication with a wireless communication apparatus on the transmission side that transmits a resultant transmission signal while variably controlling the carrier frequency of said reference carrier signal and receives at least a communication enable signal when multiplexing a modulated signal obtained by modulating an input signal by a reference carrier signal having a predetermined carrier frequency and transmitting a resultant transmission signal;

said wireless communication apparatus comprising;

reception means, having an oscillator configured to oscillate a signal having a free-running oscillation frequency, for injecting a reception signal received from said wireless communication apparatus on the transmission side into said oscillator and receiving said reception signal;

signal generation means for detecting whether the free-running oscillation frequency of the signal of said oscillator has entered a frequency range up to said injection locking to be frequency-locked with the carrier frequency of the injected reception signal and generating a communication enable signal; and

transmission means for transmitting said communication enable signal generated by said signal generation means to said wireless communication apparatus on the transmission side.