JPH066274A - Data receiving equipment - Google Patents

Abstract

PURPOSE:To provide the data receiving equipment whose power consumption is reduced by setting successively the arithmetic accuracy in accordance with the degree of a distortion of a receiving signal. CONSTITUTION:In the data receiving equipment provided with an equalizing means 4 for eliminating a distortion of a receiving signal, this equipment is provided with a distortion deciding means 2 for deciding the degree of a distortion of a receiving signal, and an arithmetic accuracy setting means 3 for setting the arithmetic accuracy of an equalizing operation in the equalizing means 4 in accordance with the degree of the distortion decided by this distortion deciding means 2. When the distortion of the receiving signal is small, it is decided by the distortion deciding means 2, and based thereon, the arithmetic accuracy setting means 3 sets the arithmetic accuracy to a lower level than the case when the distortion is large. As a result, the equalizing means 4 executes the equalizing operation with low accuracy, and the power consumption is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data receiving device used for digital mobile communication or the like, and more particularly to reducing power consumption.

[0002]

2. Description of the Related Art A conventional data receiving apparatus, as shown in FIG. 4, includes an input terminal 1 for a digital signal, an equalizer 4 for reducing distortion of a received signal, and a data output from the equalizer 4. It is composed of an output terminal 5 for sending out.

The equalizing section 4 removes waveform distortion by applying a characteristic opposite to the characteristic of the transmission line to the received signal, and its configuration is as follows: IEICE Transactions (1987). November, Vol.J72-B-II, No.11, pp.587-5
94) etc. and is widely known.

When a received signal is input to the input terminal 1, the equalization section 4 performs an equalization operation and outputs the data obtained by removing the distortion of the transmission line from the received signal to the output terminal 5.

The calculation accuracy of this equalization calculation is preset in accordance with the case where the degree of distortion is maximized, whereby the equalization section 4 can always remove the distortion of the transmission line with high accuracy. .

[0006]

However, in this conventional data receiving apparatus, since the calculation accuracy of the equalizer 4 is set in accordance with the case where the distortion of the received signal is the largest, the distortion of the received signal is reduced. If the degree is small, it will be calculated with excessive precision using unnecessary memory length and register length,
It has a problem that it consumes power consumption that does not need to be used.

Therefore, the present invention is to solve this conventional problem, and to provide a data receiving apparatus in which the power consumption is reduced by setting the accuracy of successive operations according to the degree of distortion of the received signal. It is an object.

[0008]

Therefore, according to the present invention, in a data receiving apparatus equipped with an equalizing means for removing distortion of a received signal, a distortion judging means for judging the degree of distortion of the received signal and the distortion judging means. An arithmetic precision setting means for setting the arithmetic precision of the equalization operation in the equalizing means according to the degree of distortion determined by the means is provided.

[0009]

With this device, when the distortion of the received signal is small,
The distortion determination means determines this, and based on this, the calculation accuracy setting means sets the calculation accuracy to a lower level than when the distortion is large. As a result, the equalization means performs the equalization calculation with low accuracy, and the power consumption is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a data receiving apparatus according to an embodiment of the present invention has an input terminal 1 to which a received digital signal is input.
, A distortion determination unit 2 that detects the degree of distortion of the received signal, a calculation accuracy setting unit 3 that sets the accuracy of the equalization calculation based on the result of the distortion determination unit, and an equalization calculation with the set accuracy. Equalizer 4 and output terminal 5 for outputting data from equalizer 4
It has and.

When the received signal is input, the distortion determining section 2 detects the distortion of the received signal and determines the degree of distortion of the received signal.

The degree of distortion can be determined by various methods. One method is the square between the frequency characteristic without waveform distortion and the frequency characteristic of the transmission path estimated from the received signal. There is a method of determining the degree of distortion based on the sum of errors.

In this case, the distortion determining section 2 stores the frequency characteristic without waveform distortion (FIG. 3A). On the other hand, the transmitting side performs transmission by inserting a reference signal known by the receiving side into the transmission signal. Upon receiving this, the distortion determination unit 2 estimates the frequency characteristic (FIG. 3 (b)) of the transmission path by taking the cross-correlation between the received signal and the reference signal that should have been inserted, and then determines the waveform distortion. No frequency characteristics (Fig. 3 (a))
And the estimated frequency characteristic (FIG. 3 (b)), the squared error for each constant frequency interval is obtained, and the sum thereof is calculated.

When the distortion judging section 2 outputs data representing the degree of distortion of the received signal, the calculation accuracy setting section 3 receives the data.
Sets the calculation accuracy according to the procedure shown in FIG.

Step 1; It is judged whether or not the degree of distortion is smaller than "a", and if it is smaller than "a", Step 2 is set to the calculation accuracy level α.

Step 3: When the degree of distortion is a or more, it is judged whether the degree of distortion is smaller than b (> a). If it is smaller than b, step 4; Set to a highly accurate level β.

Thus, as the degree of distortion increases, the calculation accuracy is set to a higher level, and step (m-1); when the degree of distortion is greater than z, step m; Set to.

The equalization unit 4 performs equalization calculation according to the calculation accuracy set by the calculation accuracy setting unit 3 and outputs data obtained by removing distortion of the transmission line from the received signal.

As described above, in the data receiving apparatus of the embodiment, the degree of distortion of the received signal is detected, the calculation precision is set according to the degree of the degree, and the equalization calculation is performed using the calculation precision. There is. Therefore, when the degree of distortion of the received signal is small and the calculation accuracy is not required, the calculation accuracy is suppressed and the power consumption is reduced as compared with the case where the distortion is large.

[0020]

As is apparent from the above description of the embodiments, the data receiving apparatus of the present invention can reduce power consumption without impairing the waveform distortion compensation characteristic.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a data receiving apparatus of the present invention,

FIG. 2 is a flowchart showing a determination procedure of a calculation accuracy setting unit in the embodiment,

FIG. 3 is a frequency characteristic diagram for explaining the operation of the distortion determination unit in the embodiment,

FIG. 4 is a block diagram showing a conventional data receiving apparatus.

[Explanation of symbols]

 1 Input Terminal 2 Distortion Judgment Section 3 Calculation Accuracy Setting Section 4 Equalization Section 5 Output Terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Honma 4-3-1, Tsunashima-higashi, Kohoku-ku, Yokohama-shi, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (1)

[Claims] 1. A data receiving apparatus comprising an equalizing means for removing distortion of a received signal, the distortion determining means for determining the degree of distortion of the received signal, and the distortion determining means for determining the degree of distortion determined by the distortion determining means. A data receiving apparatus comprising: an arithmetic precision setting means for setting the arithmetic precision of the equalization operation in the equalizing means.