JPH06120993A - Data reception device - Google Patents

Abstract

PURPOSE:To provide the required reception quality by detecting the phase shift due to the rotation of a signal generated by the frequency difference between the transmission and reception and correcting the phase shift by the phase rotation. CONSTITUTION:The phase is corrected by rotating the phase of an equivalent output signal obtained through the equivalence operation of an equivalence section 2 by an equivalence output correction section 3. A phase shift selection averaging section 4 performs equalizing processing by ignoring the phase shift of the equivalent output signal after the correction shifted most from the required phase. The phase correction angle is decided so as to make the data after the correction close to the required phase. With the equivalence output signal obtained by the equivalence output correction section 3, a discrimination section 5 performs the positive and negative discrimination.

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 for digital communication.

[0002]

2. Description of the Related Art Conventionally, when correcting the phase shift of an equalized output signal, the phase shift itself of a rotated equalized output signal or a simple average thereof has been used.

FIG. 2 shows the configuration of a conventional data receiving apparatus. When the received signal is input to the input terminal 21, the equalization unit 2
2 performs the equalization process, inputs the resulting equalized output signal to the equalized output correction unit 23, and corrects the phase by rotating the phase of the equalized output signal, and the phase shift average is averaged. The rotation angle is determined by simply averaging the phase shift of the equalized output signal corrected by the equalized output correction unit 23 in the equalization unit 24, and the corrected equalized output signal is input to the identification unit 25. The positive and negative of the equalized output signal corrected by are identified. If positive, 1 is output, and if negative, -1 is output, and the result is output to the output terminal 26.

As described above, even in the above conventional example, if the phase shift of the equalized output signal is correctly obtained, the desired phase correction angle can be set faithfully.

[0005]

However, for example, the equalized output signal in the case of equalizing a GMSK-modulated received signal has a different phase at the identification point depending on the transmission data pattern, so that even if the frequency shift between transmission and reception is constant. Since the obtained phase shift is not always constant, a desired phase correction angle cannot always be obtained. Further, in the above-mentioned conventional example, when a large error is included in the obtained phase due to the influence of noise or the like, a large error component remains in the phase after averaging, and it is difficult to correct to the desired phase. There was a problem.

The present invention solves the above-mentioned problem, and when averaging the phase shift of the equalized output signal after correction which has been used conventionally, the one having the largest shift from the desired phase among them is selected. By ignoring and averaging, it is possible to reduce the influence of components that include a large error, and it is possible to set the correction value so that the corrected data will be closer to the desired phase, improving the characteristics. It is an object of the present invention to provide an excellent data receiving device capable of achieving the following.

[0007]

In order to achieve the above object, the present invention provides an equalization section for performing equalization processing, and an equalization output correction section for correcting the equalization output signal output from the equalization section. When,
The phase shift is detected using the corrected signal corrected by the equalization output correction unit, and when the phase shift is averaged, the one with the largest shift from the desired phase is ignored. A phase shift averaging unit that determines the phase correction angle so that the data after averaging and correction approaches a desired phase, and a discriminating unit that discriminates positive and negative using the equalized output signal corrected by the equalized output correction unit. It has a configuration including and.

[0008]

According to the present invention, with the above configuration, the equalized output signal after the equalization processing is rotated by the phase to correct it, the phase shift is detected, and the shift of the phase shift from the desired phase is detected. By ignoring the largest one and averaging it, it is possible to reduce the influence of the component whose phase is greatly shifted, set the correction angle closer to the desired angle, and set the equalized output to the desired phase. It is possible to bring them closer to each other and improve the characteristics.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 1 is an input terminal, 2 is an equalizer,
It is connected to the input terminal 1 to perform equalization processing and output an equalization output signal. An equalization output correction unit 3 is connected to the equalization unit 2 and rotates the phase of the equalization output signal for correction. Reference numeral 4 denotes a phase shift selective averaging unit, which is connected to the equalization output correction unit 3 to detect a phase shift of the equalized output signal after correction and determine a correction angle that brings the phase closer to a desired phase. Reference numeral 5 is an identification unit, which is connected to the equalization output correction unit 3 and identifies positive or negative with respect to the equalization output signal rotated by the equalization output correction unit 3. An output terminal 6 is connected to the identification unit 5 and outputs output data.

Next, the operation of the above embodiment will be described. When the received signal is input to the input terminal 1, the equalization unit 2 first performs equalization processing. Next, the equalization output correction unit 3 rotates and corrects the phase of the equalization output signal of the equalization unit 2. The phase shift selection averaging unit 4 detects the phase shift of the equalized output signal after correction, and ignores the one having the largest shift from the desired phase when averaging the phase shift. By averaging, the correction angle is determined while reducing the influence of the component whose phase is greatly deviated. The organization unit 5 is the equalization output correction unit 3
Using the equalized output signal corrected by
If the result of the discrimination is positive, a signal of 1 is output, and if it is negative, a signal of -1 is output. The output data identified by the identifying unit 5 is output from the output terminal 6.

[0011]

As is apparent from the above-described embodiments, according to the present invention, when averaging the phase shift of the equalized output signal after the correction by the phase rotation, the phase shift from the desired phase is 1 among them.
By ignoring the largest one and averaging it, it is possible to reduce the influence of the component whose phase is greatly shifted, and it is possible to set the correction angle closer to the desired value and improve the characteristics. Have an effect.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a data receiving apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram of a conventional data receiving device.

[Explanation of symbols]

 1 Input Terminal 2 Equalization Section 3 Equalization Output Correction Section 4 Phase Shift Selection Averaging Section 5 Discrimination Section 6 Output Terminal

Claims (1)

[Claims] 1. An equalization section for performing an equalization operation on a received signal, and an equalization output correction section for correcting the phase by rotating the phase of the equalization output signal output from the equalization section. A phase shift selective averaging unit that sequentially detects a rotation angle that obtains a desired characteristic by detecting the phase shift corrected by the equalization output correction unit, and the equalization corrected by the equalization output correction unit. A data receiving device comprising a discriminator for discriminating output signals.