Data transmission and reception module, and method of adjusting reception threshold value thereof
AssigneeFujitsu Limited
InventorTetsuji Sato
Life of this patent
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Abstract
Disclosed is a method of adjusting a reception threshold value in data reception. The method comprises: generating a transmission signal on the basis of a clock regenerated from a reception signal, determining a worst phase at which a bit error rate becomes maximum by changing a phase of the transmission signal, and adjusting a reception threshold value in the state of the worst phase. The worst phase is determined by detecting the bit error rate by shifting the phase of the transmission signal by a predetermined interval while fixing the reception threshold value to a predetermined value.
Claims8
A method of adjusting a reception threshold value, the method being executed by an apparatus for performing data transmission and reception, the method comprising:
- generating a transmission signal based upon a clock regenerated from a reception signal;
- setting the reception threshold value at a first initial threshold value;
- detecting a first bit error rate of the reception signal by repeatedly shifting a phase of the transmission signal by a predetermined value in a state where the reception threshold value is being fixed to the first initial threshold value;
- determining the phase of the transmission signal at which the detected first bit error rate of the reception signal is maximized, as a worst phase of the transmission signal;
- and
- adjusting the reception threshold value to an optimum reception threshold value in a state where the phase of the transmitting signal is being fixed to the determined worst phase, by:
- setting the reception threshold value at a second initial threshold value,
- detecting a second bit error rate of the reception signal by shifting the reception threshold value from the second initial threshold value by a predetermined interval in a predetermined direction, and
- determining the optimum reception threshold value using the detected second bit error rate.
An apparatus for performing data transmission and reception, comprising:
- a threshold value adjusting part configured to adjust a reception threshold value and to perform a bit determination of the reception signal based upon the adjusted reception threshold value;
- a signal monitoring part configured to detect a first bit error rate of the reception signal output from the threshold value adjusting part;
- a clock regenerating part configured to regenerate a clock by extracting clock information from the reception signal output from the threshold value adjusting part;
- a signal generating part configured to generate a signal based upon the clock regenerated by the clock generating part;
- a phase varying part configured to adjust a phase of the signal generated by the signal generating part
- a transmission part configured to transmit the signal adjusted by the phase varying part as a transmission signal, and
- a control part configured to control each part included in the apparatus such that:
- the reception threshold value is set at a first initial threshold value,
- the first bit error rate of the reception signal is detected by shifting a phase of the transmission signal by a predetermined value in a state where the reception threshold value is being fixed to the first initial threshold value,
- the phase of the transmission signal at which the detected first bit error rate of the reception signal is maximized, is determined as a worst phase of the transmission signal, and
- the reception threshold value is adjusted to an optimum reception threshold value in a state where the phase of the transmitting signal is being fixed to the determined worst phase, by:
- setting the reception threshold value at a second initial threshold value,
- detecting a second bit error rate of the reception signal by shifting the reception threshold value from the second initial threshold value by a predetermined interval in a predetermined direction, and
- determining the optimum reception threshold value using the detected second bit error rate.
Dependencies are inferred from the claim text.