COMMUNICATION DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

• US 20120183021A1
• Filed: 12/02/2011
• Published: 07/19/2012
• Est. Priority Date: 01/13/2011
• Status: Active Grant

• Current Assignee: Monterey Research, LLC (Vector Capital Corporation)
• Original Assignee: Fujitsu Semiconductor Limited (Fujitsu Limited)
• Inventors: WATANABE, Hideaki
• Granted Patent: US 8,699,549 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04B 17/13 of power amplifiers, e.g. gain or non-linearity
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A communication device includes a transmission circuit that transmits a transmission signal under a certain transmission condition, a reception circuit that receives a reception result of the transmission signal under a certain reception condition and the certain reception condition, and an adjustment circuit that transmits information used to adjust the reception condition based on the reception result and the reception condition from the transmission circuit.

Claims

1. A communication device comprising:

a transmission circuit that transmits a transmission signal under a certain transmission condition;

a reception circuit that receives a reception result of the transmission signal under a certain reception condition and the certain reception condition; and

an adjustment circuit that transmits, based on the reception result and the reception condition, information used to adjust the reception condition from the transmission circuit.

2. The communication device according to claim 1, wherein

a reception circuit of a reception-side communication device that receives the transmission signal under the certain reception condition includes an amplification circuit that amplifies a signal within a certain band of received signals, and

the adjustment circuit adds information that controls the amplification circuit to the information used to adjust the reception condition.

3. The communication device according to claim 1, wherein

the transmission circuit transmits the transmission signal to a further communication device coupled to the communication device at a transmission amplitude that corresponds to the transmission condition,

the reception result includes a reception amplitude of the transmission signal received by the a further communication device under the certain condition, and

the adjustment circuit adjusts the amplitude based on the transmission amplitude of the transmission signal and the reception amplitude.

4. The communication device according to claim 3, wherein

the transmission circuit is set with a first amplitude value,

the adjustment circuit calculates a second amplitude value based on the first amplitude value set for the transmission circuit, a reception amplitude value corresponding to the reception amplitude, and a reference value, and

the adjustment circuit sets the second amplitude value to the transmission circuit.

5. The communication device according to claim 4, wherein the adjustment circuit calculates the second amplitude value so that the reception amplitude value becomes equal to the reference value.

6. The communication device according to claim 1, wherein

the transmission circuit includes a waveform shaping circuit that shapes a waveform of a transmission signal, and

the adjustment circuit controls an operation state of the waveform shaping circuit in accordance with the reception result.

7. The communication device according to claim 1, wherein the adjustment circuit transmits the transmission signal and the information used to adjust the reception condition during a transmission state that transmits a speed code used to set a speed at which the communication device and a further communication device communicate with each other.

8. The communication device according to claim 7, wherein

the transmission circuit repeatedly transmits a tone signal in a certain cycle, and

the adjustment circuit transmits the speed code and the information used to adjust the reception condition in an interval between the tone signal and an immediately following tone signal.

9. A communication device comprising:

a reception circuit that receives a transmission signal transmitted from a further communication device under a certain reception condition;

a transmission circuit that transmits a reception result of the transmission signal received by the reception circuit and the reception condition to the further communication device; and

an adjustment circuit that adjusts the reception condition in response to a receipt notification transmitted from the further communication device based on the reception result and the reception condition.

10. A communication system comprising first and second communication devices that are coupled to each other,

wherein the first communication device includes:

a first transmission circuit that transmits a transmission signal under a certain transmission condition;

a first reception circuit that receives a reception result of the transmission signal under a certain reception condition and the certain reception condition; and

a first adjustment circuit that transmits, based on the reception result and the reception condition, information used to adjust the reception condition from the first transmission circuit; and

wherein the second communication device includes;

a second reception circuit that receives the transmission signal transmitted from the first communication device under a certain reception condition;

a second transmission circuit that transmits the reception condition and the reception result of the transmission signal received by the second reception circuit to the first communication device; and

a second adjustment circuit that adjusts the reception condition of the second reception circuit based on the reception result and the reception condition in response to a receipt notification transmitted from the first communication device.

11. A communication method comprising:

transmitting a transmission signal under a certain transmission condition from a transmission circuit of a communication device;

receiving, with a reception circuit of the communication device, a reception result of the transmission signal under a certain reception condition and the certain reception condition; and

transmitting, information generated by an adjustment circuit of the communication device and used to adjust the reception condition based on the reception result and the reception condition, from the transmission circuit.

12. A method for adjusting a communication device, the method comprising:

receiving a transmission signal transmitted from a further communication device with a reception circuit of the communication device that operates under a certain reception condition;

transmitting, from a transmission circuit of the communication device, the reception condition and reception result of the transmission signal received by the reception circuit and to the further communication device; and

adjusting, with an adjustment circuit of the communication device, the reception condition based on the reception result and the reception condition in response to a receipt notification transmitted from the further communication device.