JP2007318227A - Signal quality optimizing apparatus and signal quality optimizing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and system for optimizing the quality of a signal in high speed serial transmission. <P>SOLUTION: A reception section 1 includes: an equalizer 11 that receives reception data, corrects the received data according to an adjustment control signal and outputs the corrected data when receiving an adjustment control signal for instructing correction of the received data and does not correct the received data and outputs the received data when not receiving the adjustment control signal; and a BER measurement function section 13 that repeats a series of operations of: receiving equalizer output data outputted from the equalizer 11; measuring the BER of the received equalizer output data; generating the adjustment control signal on the basis of a result of the measurement of the measured BER; and outputting the generated adjustment control signal to the equalizer 11 until the BER of the equalizer output data received from the equalizer 11 is a minimum. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a signal quality optimizing device and a signal for optimizing the quality of a transmission signal by correcting the transmission signal based on a measurement result obtained by measuring a BER (Bit Error Rate) of a transmission signal to be received. It relates to a quality optimization system.

In the conventional signal transmission method, the waveform is corrected by adjusting the equalizer function mounted on the reception side depending on whether or not a reception error has occurred on the reception side (for example, Patent Document 1). In addition, a method for preventing a transmission error by measuring a bit error rate on the reception side and transmitting a control signal for adjusting a driver on the transmission side based on the result from the reception side to the transmission side has been proposed (for example, Patent Document 2).
JP2004-274585, signal transmission system and signal transmission method JP 2002-223204, high speed serial transmission method and method

  The conventional signal transmission system has the following problems. In the method of Patent Document 1, since control is performed based on the presence or absence of an error, there may be a case where the state adjusted to avoid the error is not an optimal state. There is a problem that there is a high possibility that an error occurs frequently. In the method shown in Patent Document 2, when the transmission quality from the transmission side to the reception side is poor, the quality of the transmission path for transmitting the control signal to the transmission side is also likely to be bad, and the control signal is normal. There is a problem that transmission becomes impossible.

  An object of the present invention is to optimize signal quality in high-speed serial transmission.

The signal quality optimization apparatus of the present invention
When receiving data is inputted and when a receiving data correction instruction signal instructing correction of the receiving data is inputted, the receiving data is corrected and outputted according to the receiving data correction instruction signal, and the receiving data correction instruction signal is A reception data correction unit that outputs the received data without correcting the input when not input;
The received data correction unit output data, which is the data output from the received data correction unit, is input, the BER (Bit Error Rate) of the input received data correction unit output data is measured, and the measured BER is measured. The reception data correction unit output data that is input from the reception data correction unit, a series of operations for generating the reception data correction instruction signal based on the result and outputting the generated reception data correction instruction signal to the reception data correction unit And a BER measurement function unit that repeats until the BER becomes a value smaller than a predetermined value.

  According to the present invention, signal quality in high-speed serial transmission can be optimized.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. The first embodiment relates to a signal quality optimization device that optimizes the quality of a received transmission signal by correcting the BER of the received transmission signal (received data) to be a minimum.

(Configuration of receiving unit 1)
FIG. 1 is a configuration block diagram of receiving section 1 (an example of a signal quality optimization apparatus) in the first embodiment. The reception unit 1 includes an equalizer 11 (an example of a reception data correction unit), a reception buffer 12, and a BER measurement function unit 13.
(1) The equalizer 11 corrects the waveform of the received data received. The equalizer 11 inputs received data and corrects and outputs the received data according to the received data correction instruction signal when an adjustment control signal (received data correction instruction signal) for instructing correction of the received data is input. When the reception data correction instruction signal is not input, the reception data is output without correction. The adjustment control signal is generated and output by the BER measurement function unit 13. This will be described later.
(2) The reception buffer 12 receives the received data via the equalizer 11.
(3) The BER measurement function unit 13 measures the BER (Bit Error Rate) of the received data. The BER measurement function unit 13 receives the data output from the equalizer 11 (received data correction unit output data), measures the BER of the input data, generates an adjustment control signal based on the measured BER measurement result, A series of operations of outputting the generated adjustment control signal to the equalizer 11 is repeated until the BER of data input from the equalizer 11 becomes the lowest value.

(Configuration of BER measurement function unit 13)
FIG. 2 is a diagram illustrating a detailed configuration of the BER measurement function unit 13. As shown in FIG. 2, the BER measurement function unit 13 includes a waveform evaluation unit 131, a BER estimation unit 132, an adjustment signal generation unit 133, a data decoding unit 134, a phase shift unit 135, a clock extraction unit 136, and a BER measurement unit 137. With.
(1) The waveform evaluation unit 131 evaluates the received waveform to obtain a standard deviation of random jitter.
(2) The BER estimation unit 132 shifts the clock phase from the standard deviation of the received waveform obtained by the waveform evaluation unit 131, the BER value measured by the BER measurement unit 137, and the clock phase shift amount by the phase shift unit 135. If not, that is, the BER value at the original clock phase is estimated.
(3) The adjustment signal generation unit 133 generates a signal for adjusting the correction amount of the data waveform based on the result of the BER estimation unit 132.
(4) The data decoding unit 134 samples the received data with the clock whose phase is shifted by the phase shift unit 135.
(5) The phase shift unit 135 shifts the phase of the clock extracted by the clock extraction unit 136 by an arbitrary amount.
(6) The clock extraction unit 136 extracts a clock from the received data.
(7) The BER measurement unit 137 measures the error amount in the data decoded by the data decoding unit 134.

Next, the operation of the receiving unit 1 will be described with reference to FIG.
(1) First, as an initial state, the equalizer 11 passes a state without compensation, that is, received received data as it is. The BER measurement function unit 13 inputs the received data that is passed through without being corrected by the equalizer 11 and measures the error rate (BER).
(2) Next, when the error rate is high, the BER measurement function unit 13 controls the equalizer 11 so as to enhance the compensation effect. That is, the BER measurement function unit 13 inputs uncorrected reception data from the equalizer 11 in the initial state, measures the BER of the input reception data, and receives the received BER from the equalizer 11 based on the measured BER measurement result. An adjustment control signal for instructing correction of data is generated. Then, the generated adjustment control signal is output to the equalizer 11. The equalizer 11 receives an adjustment control signal, corrects the received data in accordance with the adjustment control signal, and outputs the correction.
(3) The BER measurement function unit 13 inputs the corrected received data from the equalizer 11. Next, the BER measurement function unit 13 measures the BER of the input received data that has been corrected, and generates an adjustment control signal that instructs the equalizer 11 to correct the received data based on the measurement result of the measured BER. . Then, the generated adjustment control signal is output to the equalizer 11. The equalizer 11 receives an adjustment control signal, corrects the received data in accordance with the adjustment control signal, and outputs the correction. The BER measurement function unit 13 repeats such a series of operations until the error rate is improved and the error rate measurement and the adjustment of the equalizer 11 (generation of the adjustment control signal). That is, the BER measurement function unit 13 repeats the above series of operations until the BER of the reception data input from the equalizer 11 becomes a value smaller than a predetermined value (the lowest value in the first embodiment).

(BER measurement method)
Next, a BER measurement method in this method will be described. In general, measurement of a low BER value is very difficult because it is very time consuming. Therefore, the BER measurement in the first embodiment is performed by the following method.

  Normally, the acquisition timing of serial data is at the center of the eye diagram as shown in FIG. 3, but the occurrence frequency of errors is increased by intentionally shifting this as shown in FIG. Specifically, as shown in FIG. 2, the data acquisition timing is changed by shifting the phase of the clock extracted by the clock extraction unit 136 from the received data by the phase shift unit 135. When the received data is sampled by the data decoding unit 134 using the clock with the phase shifted, the frequency of error increases, and the BER measurement unit 137 can easily measure the BER.

Further, the waveform evaluation unit 131 derives a standard deviation of random jitter by approximating the jitter histogram of the received data waveform with two Gaussian distributions (Dual-Dirac model) as shown in FIG.
(1) With this “standard deviation”
(2) A shift amount of data acquisition timing by the phase shift unit 135 described above,
(3) and the BER value when the data acquisition timing measured by the BER measurement unit 137 is shifted,
From these three pieces of information, the BER value (estimated value) at the original data acquisition timing is estimated, and this estimated value is adopted as the BER.

(Relationship between BER and correction)
Although the signal quality can be optimized by the correction as described above, the “relation between BER and correction” will be described with reference to FIG.
(1) In Patent Document 1 in the background art described above, a method of checking the received data and detecting the presence or absence of an error is adopted. Further, the adjustment is finished when an error cannot be detected while adjusting the equalizer. This error detection method has a problem that the presence or absence of an error cannot be determined unless the amount of data corresponding to the BER value of the system is checked. For example, in the case of 10G Ethernet (registered trademark) cited in Patent Document 1, if BER is ^10-18 , it is necessary to measure continuously for 2.5 years. Actually, error check is performed in a much shorter time than this, so the possibility that the “communication state where BER is low but not optimal” as shown in FIG. Is expensive. Such a non-optimal communication state easily changes to a state where the BER is high, that is, a state where the communication quality is poor, due to environmental conditions such as temperature, and there is a possibility that sufficiently high quality transmission cannot be performed.
(2) As shown in FIG. 6, the waveform correction by the equalizer (or pre-emphasis described in the second embodiment) does not sufficiently lower the BER if the correction amount is weak, and conversely, if the correction is too strong, the BER It has the property of becoming higher (deteriorating). In other words, the relationship between the BER value and the correction amount by the equalizer (or pre-emphasis) is a characteristic of a downwardly convex quadratic curve as illustrated in FIG. Therefore, it is possible to specify the point at which the BER is lowest by obtaining the apex of the parabola by a mathematical method. As described above, since there is an optimum correction amount that minimizes the BER, the equalizer 11 (or pre-emphasis) is performed so that the BER is minimized by the method in the first embodiment (or the second embodiment to be described later). By adjusting the, it is possible to receive data in the best state.

  Although it is preferable to repeat until the lowest value for BER is obtained, as shown in FIG. 6, a predetermined value near the lowest value (vertex) is set as a threshold value, and BER is a value smaller than this threshold value. At this point, the minimum value may be considered.

  As described above, since the BER measurement function unit 13 controls the equalizer 11 so that the BER measurement result becomes the lowest, it is possible to receive data in the best state and perform stable high-quality communication. Can do.

(Time of optimization operation)
In the first embodiment described above, the transmission quality optimizing operation has been described. However, the timing at which the optimizing processing operation is performed is not defined. Hereinafter, the operation timing of the optimization process will be described. The “optimization process” means a series of processes that are performed when the BER of received data becomes the lowest value.

(1) (Timing 1: At startup)
In the first embodiment, the automatic optimization operation is performed by the initialization process at the time of activation. Thereby, signal transmission with the best transmission quality can be performed without disturbing normal operation. By performing an optimization process, which is an extra operation during normal operation, as one of the initialization processes at the time of system startup, it is possible to improve not only the transmission quality but also the use efficiency of the transmission path.
(2) (Timing 2: During idle period)
The automatic optimization process is performed during an idle period during which no significant communication is performed during normal operation, in addition to the initialization process at startup. By performing it even during the idle period, it is possible to follow changes in transmission quality due to changes in temperature, humidity, power supply voltage, etc., so that signal transmission can always be performed with the best transmission quality.
(3) Although there is a case where the receiving unit 1 is activated before the device on the transmission side, there is no problem as follows. In this case, it is possible for the reception side to detect that the activation on the transmission side is delayed because a normal signal does not come to the reception buffer 12. In the case of one-to-one communication, communication cannot be performed unless one of them is activated (no need). Therefore, in this case, the reception side can interrupt initialization and wait for the transmission side to start. Then, after the transmission side is activated, the initialization process can be resumed, and the transmission quality optimization process can be performed.

  Next, the case where the receiving unit 1 further includes a nonvolatile memory for storing a predetermined adjustment control signal will be described with reference to FIG. 7 is a configuration in which the receiving unit 1 includes a nonvolatile memory 14 (an example of a received data correction instruction signal storage unit) compared to FIG.

  In FIG. 7, the nonvolatile memory 14 is a nonvolatile storage area and is connected to the BER measurement function unit 13.

  Next, the operation will be described. The optimum equalizer adjustment value (reception data correction instruction signal) possessed by the BER measurement function unit 13 is stored in the nonvolatile memory 14. That is, when the lowest BER value is measured in the optimization process, the BER measurement function unit 13 stores the adjustment control signal that is the basis for correcting the reception data of the BER value in the nonvolatile memory 14. The BER measurement function unit 13 can complete the adjustment in a shorter time by using the value (adjustment control signal) stored in the nonvolatile memory 14 as the initial value at the next startup.

  In the receiving unit 1 according to the first embodiment, the BER measurement function unit 13 controls the equalizer 11 until the BER measurement result becomes a value smaller than a predetermined value, so that data can be received in a state close to the best. Thus, stable and high-quality communication can be performed.

  In the receiving unit 1 according to the first embodiment, since the BER measurement function unit 13 controls the equalizer 11 until the BER reaches the minimum value, it becomes possible to receive data in the best state, and stable high-quality communication. It can be performed.

  In the receiving unit 1 according to the first embodiment, the BER measurement function unit 13 measures the BER by increasing the bit error. Therefore, even the low BER can be measured in a shorter time.

  In the receiving unit 1 of the first embodiment, the BER measurement function unit 13 executes a series of optimization processes in the initialization process at the time of startup of the own apparatus, so that data is transmitted with the best transmission quality without disturbing the normal operation. Can be transmitted.

  In the receiving unit 1 according to the first embodiment, the BER measurement function unit 13 executes a series of optimization processes in an initialization process at the time of startup of the own apparatus and also during a communication idle period. Therefore, it is possible to always ensure good transmission quality.

  In the receiving unit 1 according to the first embodiment, the nonvolatile memory 14 stores the adjustment control signal with the BER as the lowest value, so that the adjustment control signal can be used at the next activation. Further, by using the adjustment control signal at the next startup, the optimization process can be executed in a short time.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. In the first embodiment, the data is corrected on the reception side, whereas in the second embodiment, the transmission side apparatus corrects the data. In the second embodiment, the reception side apparatus measures the BER of the reception data, generates a signal (an emphasis adjustment packet described later) that instructs correction of transmission data based on the measured BER, and transmits the signal to the transmission side apparatus. The transmission side apparatus receives this signal and corrects transmission data to be transmitted in accordance with the received signal. The reception side apparatus repeats transmitting a signal instructing correction of transmission data to the transmission side apparatus until the BER of the transmission data to be received becomes the minimum value.

  FIG. 8 is a diagram showing the configuration of the signal quality optimization system in the second embodiment. The signal quality optimization system includes a transmission / reception unit 2a (an example of a signal quality optimization device) and a transmission / reception unit 2b (an example of a communication device). The transmission / reception unit 2a and the transmission / reception unit 2b have the same configuration, and corresponding components are denoted by the same reference numerals.

The configuration of the transmission / reception unit 2a will be described. As shown in FIG. 8, the transmission / reception unit 2a includes a pre-emphasis adjustment function built-in transmission buffer 21a (an example of a transmission data correction instruction signal transmission unit), a pre-emphasis adjustment function unit 22a, a pre-emphasis adjustment packet analysis unit 23a, and a reception buffer 24a. (An example of a reception unit), a transmission data switching function unit 25a, a pre-emphasis adjustment packet generation unit 26a (an example of a transmission data correction instruction signal generation unit), and a BER measurement function unit 27a.
(1) The transmission buffer 21a with a built-in pre-emphasis adjustment function is a transmission buffer with a built-in pre-emphasis adjustment function. When the transmission data switching function unit 25a is connected to the terminal 2, the transmission buffer 21a with a built-in pre-emphasis adjustment function adjusts pre-emphasis according to the adjustment control signal output from the pre-emphasis adjustment function unit 22a. When the transmission data switching function unit 25a is connected to the terminal 1, the pre-emphasis adjustment packet generated by the pre-emphasis adjustment packet generation unit 26a is transmitted.
(2) The pre-emphasis adjustment function unit 22a outputs an adjustment control signal to the pre-emphasis adjustment function built-in transmission buffer 21a according to an instruction from the pre-emphasis adjustment packet analysis unit 23a.
(3) The pre-emphasis adjustment packet analysis unit 23a analyzes the pre-emphasis adjustment packet.
(4) The reception buffer 24a receives the transmission data transmitted by the transmission / reception unit 2b.
(5) The transmission data switching function unit 25a switches data to be transmitted.
(6) The pre-emphasis adjustment packet generator 26a generates a pre-emphasis adjustment packet.
(7) The BER measurement function unit 27a measures the BER of the received data in the same manner as the BER measurement function unit 13 of FIG. 1 in the first embodiment. However, the BER measurement function unit 27a does not generate a pre-emphasis adjustment packet corresponding to the adjustment control signal generated by the BER measurement function unit 13. The pre-emphasis adjustment packet generation unit 26a generates the pre-emphasis adjustment packet. If the BER measurement function unit 27a and the pre-emphasis adjustment packet generation unit 26a are viewed as the BER measurement function unit 13 in FIG. 1, the functions are the same as those of the BER measurement function unit 13.
(8) The transmission line 31 and the transmission line 32 are connected to the transmission / reception units 2a and 2b.

  Next, the operation will be described. The transmission / reception unit 2b will be described as a transmission side device, and the transmission / reception unit 2a will be described as a reception side device.

  First, the pre-emphasis adjustment function unit 22b controls the transmission buffer 21b with a built-in pre-emphasis adjustment function so that data is output without any adjustment as an initial state.

  The signal (transmission data) output from the transmission buffer 21b with a built-in pre-emphasis adjustment function of the transmission / reception unit 2b reaches the reception buffer 24a of the other transmission / reception unit 2a while degrading the signal quality via the transmission line 31.

  The signal received by the reception buffer 24a is input to the BER measurement function unit 27a. The BER measurement function unit 27a measures BER. The BER measurement method is the same as in the first embodiment.

  The pre-emphasis adjustment packet generation unit 26a is an example of a pre-emphasis adjustment packet (an example of a transmission data correction instruction signal) that instructs to increase pre-emphasis when the BER measured by the BER measurement function unit 27a is high (signal quality is poor). ) And output to the pre-emphasis adjustment function built-in transmission buffer 21a.

  The transmission buffer 21a with a built-in pre-emphasis adjustment function outputs the input pre-emphasis adjustment packet. In the above, the transmission data switching function unit 25a is connected to the terminal 1.

  At this time, the transmission buffer 21a with a built-in pre-emphasis adjustment function outputs a pre-emphasis adjustment packet at a transmission rate as low as 1/2 or 1/4 of the normal transmission rate when data is transmitted to the transmission / reception unit 2b. . Thereby, since the influence of deterioration by the transmission line 32 can be eliminated, the pre-emphasis adjustment packet can be reliably transmitted. As described above, at this time, the transmission data switching function unit 25a is in a state of connecting the pre-emphasis adjustment packet generation unit 26a and the pre-emphasis adjustment function built-in transmission buffer 21a (connected to the terminal 1). It is not connected to a normal data path (connected to terminal 2).

  The pre-emphasis adjustment packet is input to the reception buffer 24b via the transmission line 32. The received pre-emphasis adjustment packet is sent to the pre-emphasis adjustment packet analysis unit 23b and analyzed by the pre-emphasis adjustment packet analysis unit 23b. Based on the analysis result, the pre-emphasis adjustment function unit 22b generates an adjustment control signal and outputs the adjustment control signal to the transmission buffer 21b with a built-in pre-emphasis adjustment function. The transmission buffer 21b with a built-in pre-emphasis adjustment function adjusts the pre-emphasis of transmission data in accordance with the input adjustment control signal and outputs it.

  By repeating the above operations, it is possible to investigate a state where adjustment of pre-emphasis is insufficient or an excessive state. The pre-emphasis adjustment is the same as in the equalizer described with reference to FIG. With the characteristics shown in FIG. 6, the signal transmission with the best transmission quality can be realized by finally setting the adjustment state of the pre-emphasis when the BER is minimum, that is, the optimum adjustment state.

  Although it is preferable to repeat until a minimum value for BER is obtained, a predetermined value in the vicinity of the minimum value (vertex in FIG. 6) is set as a threshold value as in the first embodiment, and BER is set to this threshold value. You may make it consider it as the minimum value when it becomes a smaller value.

(Automatic optimization operation timing)
In the second embodiment described above, the transmission quality optimization process has been described, but the timing at which the optimization process is performed is not defined. Hereinafter, the operation timing of the optimization process will be described. Note that “optimization processing” means a series of processing performed when the BER of received data becomes the lowest value, as in the case of the first embodiment.

(1) (Timing 1: At startup)
In the second embodiment, an automatic optimization operation is first performed by an initialization process at startup. Thereby, signal transmission with the best transmission quality can be performed without disturbing normal operation.
(2) (Timing 2: During idle period)
The automatic optimization operation is performed during an idle period during which no significant communication is performed during normal operation, in addition to initialization processing at the time of startup. Since it is possible to follow changes in transmission quality due to variations in temperature, humidity, power supply voltage, etc., signal transmission with the best transmission quality can always be performed.
(3) Even if either the transmission side device (transmission / reception unit 2b in the example) or the reception side device (transmission / reception unit 1a in the example) is activated first, inconvenience occurs as follows. Absent.
(Case where the sending device starts after a delay)
In this case, it is possible for the reception side to detect that the activation on the transmission side is delayed because a normal signal does not come to the reception buffer 12. In addition, because of one-to-one communication, communication is not possible (no need) unless one is activated. Therefore, in this case, the reception side can interrupt initialization and wait for the transmission side to start. Then, after the transmission side is activated, the initialization process can be resumed, and the transmission quality optimization process can be performed.
(Case where receiver starts late)
As in the case described above, it is possible for the transmission side to detect that the activation on the reception side is delayed because a normal signal does not come to the reception buffer on the transmission side. Therefore, as with the case where the receiving side is delayed, the initialization process is suspended until the receiving side starts up, waits for the receiving side to start, then the initialization process is restarted, and the transmission quality optimization process is performed. I can do it.

  Next, a case where the transmission / reception unit 2b further includes a nonvolatile memory 28b (an example of a transmission data correction instruction signal storage unit) that stores a predetermined adjustment control signal will be described with reference to FIG. FIG. 9 shows a configuration in which the transmission / reception unit 2b of FIG. 8 further includes a nonvolatile memory 28b.

  In FIG. 9, a nonvolatile memory 28b is a nonvolatile storage area and is connected to the pre-emphasis adjustment function unit 22b.

  Next, the operation will be described. The optimum pre-emphasis adjustment value set in the pre-emphasis adjustment function unit 22b is stored in the nonvolatile memory 28b. The “optimum pre-emphasis adjustment value” corresponds to data corresponding to the pre-emphasis adjustment packet received last in the optimization processing operation. At the next startup, the adjustment can be completed in a shorter time by using the data stored in the nonvolatile memory 28b as an initial value.

  In the transmission / reception unit 2a of the second embodiment, the transmission buffer 21a with a built-in pre-emphasis adjustment function transmits the pre-emphasis adjustment packet at a transmission rate lower than the normal transmission rate, so that the pre-emphasis adjustment packet is reliably transmitted to the partner device. can do.

  In the transmission / reception unit 2a according to the second embodiment, the reception buffer 24a, the BER measurement function unit 27a, the pre-emphasis adjustment packet generation unit 26a, and the transmission buffer 21a with a built-in pre-emphasis adjustment function are such that the BER measurement result is smaller than a predetermined value. Since each operation is repeated until it becomes, it becomes possible to receive data in a state close to the best, and stable high-quality communication can be performed.

  The transmission / reception unit 2a according to the second embodiment includes a reception buffer 24a, a BER measurement function unit 27a, a pre-emphasis adjustment packet generation unit 26a, and a transmission buffer 21a with a built-in pre-emphasis adjustment function until the BER measurement result reaches a minimum value. Since the operation is repeated, data can be received in the best condition, and stable high quality communication can be performed.

  In the transmission / reception unit 2a according to the second embodiment, since the BER measurement function unit 27a measures the BER by increasing the bit error, even a low BER can be measured in a shorter time.

  In the transmission / reception unit 2a according to the second embodiment, the reception buffer 24a, the BER measurement function unit 27a, the pre-emphasis adjustment packet generation unit 26a, and the pre-emphasis adjustment function built-in transmission buffer 21a have a BER smaller than a predetermined value. Since each of the operations repeated up to is executed in the initialization process at the time of startup of the own apparatus, data can be transmitted with the best transmission quality without disturbing the normal operation.

  In the transmission / reception unit 2a according to the second embodiment, the reception buffer 24a, the BER measurement function unit 27a, the pre-emphasis adjustment packet generation unit 26a, and the pre-emphasis adjustment function built-in transmission buffer 21a have a BER smaller than a predetermined value. Each of the operations repeated until is performed in the initialization process at the time of startup of the own apparatus, and also during the idle period of communication. Therefore, it is possible to always ensure good transmission quality.

  In the signal quality optimization system of the second embodiment, the nonvolatile memory 28b of the transmission / reception unit 2b stores data corresponding to the pre-emphasis adjustment packet with the BER being the lowest value, so that the data can be used at the next startup. it can. In addition, the optimization process can be executed in a short time by using the data at the next startup.

FIG. 3 is a block diagram of receiving apparatus 1 in the first embodiment. FIG. 3 is a block diagram of a BER measurement function unit 13 in the first embodiment. FIG. 6 is a diagram for explaining an increase in the occurrence frequency of bit errors in the first embodiment. FIG. 6 is a diagram for explaining an increase in the occurrence frequency of bit errors in the first embodiment. FIG. 6 is a diagram for explaining an increase in the occurrence frequency of bit errors in the first embodiment. FIG. 4 is a diagram showing a relationship between BER and correction in the first embodiment. FIG. 2 is a block diagram of a receiving device 1 including the nonvolatile memory 14 in the first embodiment. The block diagram of the signal quality optimization system in Embodiment 2. FIG. The block diagram of the transmission / reception part 2b provided with the non-volatile memory 28b in Embodiment 2. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Reception part, 11 Equalizer, 12 Reception buffer, 13 BER measurement function part, 14 Non-volatile memory, 131 Waveform evaluation part, 132 BER estimation part, 133 Adjustment signal generation part, 134 Data decoding part, 135 Phase shift part, 136 Clock extraction Unit, 137 BER measurement unit, 2a, 2b transmission / reception unit, 21a, 21b pre-emphasis adjustment function built-in transmission buffer, 22a, 22b pre-emphasis adjustment function unit, 23a, 23b pre-emphasis adjustment packet analysis unit, 24a, 24b reception buffer, 25a , 25b Transmission data switching function unit, 26a, 26b Pre-emphasis adjustment packet generation unit, 27a, 27b BER measurement function unit, 28a Non-volatile memory.

Claims (15)

When receiving data is inputted and when a receiving data correction instruction signal instructing correction of the receiving data is inputted, the receiving data is corrected and outputted according to the receiving data correction instruction signal, and the receiving data correction instruction signal is A reception data correction unit that outputs the received data without correcting the input when not input;
The received data correction unit output data, which is the data output from the received data correction unit, is input, the BER (Bit Error Rate) of the input received data correction unit output data is measured, and the measured BER is measured. The reception data correction unit output data that is input from the reception data correction unit, a series of operations for generating the reception data correction instruction signal based on the result and outputting the generated reception data correction instruction signal to the reception data correction unit A signal quality optimizing device comprising: a BER measurement function unit that repeats until the BER of the signal becomes smaller than a predetermined value. The BER measurement function unit
2. The signal quality optimization apparatus according to claim 1, wherein the series of operations is repeated until the BER of the reception data correction unit output data input from the reception data correction unit reaches a minimum value. The BER measurement function unit
An estimated value of the actual BER based on the received data correction unit output data that increases the frequency of occurrence of bit errors in the output data of the received data correction unit input from the received data correction unit and increases the frequency of occurrence of bit errors The signal quality optimization apparatus according to claim 1, wherein the estimated value calculated is used as a BER. The BER measurement function unit
The series of operations that are repeated until the BER of the reception data correction unit output data input from the reception data correction unit is smaller than a predetermined value are executed in an initialization process at the time of startup in the own apparatus. The signal quality optimizing device according to claim 1. The BER measurement function unit
The series of operations that are repeated until the BER of the reception data correction unit output data input from the reception data correction unit is smaller than a predetermined value are executed during an idle period when the device itself is not performing significant communication. The signal quality optimizing device according to claim 1, wherein The signal quality optimization device further includes:
A reception data correction instruction signal storage unit that nonvolatilely stores the reception data correction instruction signal corresponding to a value smaller than the predetermined value, the reception data correction instruction signal generated by the BER measurement function unit; The signal quality optimizing device according to claim 1, wherein The BER measurement function unit
7. The signal quality optimization device according to claim 6, wherein the reception data correction instruction signal stored in the reception data correction instruction signal storage unit is output to the reception data correction unit at the next start-up of the device itself. When a transmission data correction instruction signal for instructing correction of transmission data is input in a communication apparatus that is a partner of data communication, the transmission data is corrected and transmitted according to the transmission data correction instruction signal, and the transmission data correction is performed. A receiving unit that receives the transmission data transmitted from the communication device that transmits without correcting the transmission data when the instruction signal is not input;
A BER measurement function unit that inputs the reception data received by the reception unit and measures a BER of the input reception data;
A transmission data correction instruction signal generation unit that generates the transmission data correction instruction signal based on a BER measurement result measured by the BER measurement function unit;
A transmission data correction instruction signal for transmitting the transmission data correction instruction signal generated by the transmission data correction instruction signal generation unit to the communication apparatus at a transmission rate lower than a normal transmission rate when transmitting data to the communication apparatus. A signal quality optimizing device comprising a transmitting unit. Each of the reception unit, the BER measurement function unit, the transmission data correction instruction signal generation unit, and the transmission data correction instruction signal transmission unit,
9. The signal quality optimization apparatus according to claim 8, wherein each operation is repeated until the BER of the received data becomes a value smaller than a predetermined value. Each of the reception unit, the BER measurement function unit, the transmission data correction instruction signal generation unit, and the transmission data correction instruction signal transmission unit,
10. The signal quality optimization apparatus according to claim 9, wherein each operation is repeated until a BER of the received data becomes a minimum value. The BER measurement function unit
The frequency of occurrence of bit errors in the received data input from the receiving unit is increased, an estimated value of actual BER is calculated based on the received data that has increased the frequency of occurrence of bit errors, and the calculated estimated value is The signal quality optimization apparatus according to claim 8, wherein the signal quality optimization apparatus is employed as a BER. Each of the reception unit, the BER measurement function unit, the transmission data correction instruction signal generation unit, and the transmission data correction instruction signal transmission unit,
12. Each operation repeated until the BER of the received data becomes a value smaller than a predetermined value is executed in an initialization process at the time of startup in the own apparatus. Signal quality optimization device. Each of the reception unit, the BER measurement function unit, the transmission data correction instruction signal generation unit, and the transmission data correction instruction signal transmission unit,
Each operation repeated until the BER of the received data becomes a value smaller than a predetermined value is executed during an idle period when the device itself is not performing significant communication with the communication device. The signal quality optimization apparatus according to claim 9. When a transmission data correction instruction signal for instructing correction of transmission data is input to a communication apparatus that is a partner of data communication, the transmission data is corrected and transmitted according to the transmission data correction instruction signal, and the transmission data correction instruction is transmitted. A communication device that transmits without correcting the transmission data when no signal is input;
A receiving unit that receives the transmission data transmitted from the communication device as received data;
A BER measurement function unit that inputs the reception data received by the reception unit and measures a BER of the input reception data;
A transmission data correction instruction signal generation unit that generates the transmission data correction instruction signal based on a BER measurement result measured by the BER measurement function unit;
A transmission data correction instruction signal for transmitting the transmission data correction instruction signal generated by the transmission data correction instruction signal generation unit to the communication apparatus at a transmission rate lower than a normal transmission rate when transmitting data to the communication apparatus. A signal quality optimization device having a transmission unit,
The signal quality optimization device includes:
Each of the reception unit, the BER measurement function unit, the transmission data correction instruction signal generation unit, and the transmission data correction instruction signal transmission unit,
Each operation is repeated until the BER of the received data becomes smaller than a predetermined value,
The communication device
The transmission data correction instruction signal transmitted by the transmission data correction instruction signal transmission unit of the signal quality optimization device and corresponding to a value smaller than the predetermined value is stored in a nonvolatile manner. A signal quality optimization system comprising a transmission data correction instruction signal storage unit. The communication device further includes:
When the transmission data correction instruction signal storage unit stores the transmission data correction instruction signal, the transmission data correction instruction signal stored in the transmission data correction instruction signal storage unit is input at the next start-up of its own device. A transmission data correction unit that corrects the transmission data according to the input transmission data correction instruction signal;
15. The signal quality optimization system according to claim 14, further comprising a data transmission unit that transmits transmission data corrected by the transmission data correction unit.

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