The method of formation of quality measures for signaling packets

 

(57) Abstract:

The method of forming the receiver measures the SQ quality vector signal of the received signal packet is intended for use in systems of the mobile digital radio. The method includes forming a first assessment ESthe energy of the useful signal vector signal, forming a second assessment of Enand other energy component of the vector signal and the formation of SQ measures quality vector signal according to the formula SQ = K1ES/K(K2+En), where K1and K2- predefined constants. 7 C.p. f-crystals, 1 Il.

The invention relates to a method of forming a measure SQ quality vector signal signal packet received by the receiver, for systems in the mobile digital radio.

In systems mobile digital radio uses various quality measures adopted by the signal receiver to confirm the accuracy of this signal. For example, the correctness of the so-called package access checks at the base station. These packets are sent by the mobile station in connection with the exercise of access. In this situation it is important to be able to determine whether the received signal is a package que measures of quality do not possess satisfactory stability and some specific types of interference can interpret the base station as a real packet access and thereby block the whole base station.

Known technical solution (FI-B-86935, 1992), according to which the analog communication system form the ratio of the sum of signal and noise to noise, and for this particular case, when the signal frequency is known.

The aim of the invention is to provide a method of determining stable measures SQ quality of the signal-to-noise ratio for the received signal.

This is achieved in the manner specified in the restrictive part of the claims. Distinctive features of the method are given in the characterizing portion p. 1 claims.

It is proved that this measure SQ correlates with frequency of errors on the raw bits in the receiver at the output of the equalizer and to a large extent is independent of the type of interference.

The drawing shows a block diagram of a device for calculating the SQ measures of quality in accordance with the invention.

The components of the complex signal received by the receiver, X(K) (in the drawing complex signals are represented by double lines) are fed to the correlator 10, where they are correlated with components of the installation sequence d(K) one of the well-known manner. This sequence is generated by the generator 12 installation sequence. To the stake. The same sequence is emitted by the transmitter, and in GSM it is located at the beginning of the service access and in the middle of the normal signaling packet. In block 14 channel estimation using correlation values from the correlator estimation of the channel. This assessment may include, for example, five correlation values h(i) near the part generated by the generator 10 of the correlation sequence, where concentrated energy. There are various methods for determining these five correlation values. An acceptable method is described, for example, in the application Sweden 92 00079-3 published 14.03.93, the Evaluation of h(i) of the channel may contain more or less than five components.

The channel estimation unit 14 estimates the channel is supplied to the unit 16 to calculate the energy that calculates a measure of the energy of the channel estimation, for example, in accordance with the expression

< / BR>
Correlation components h(i) from the channel estimation is used as the filter coefficients in the filter 18, which by filtration installation sequence d(k) generated by the generator 12, is formed by the sequence of a sample estimate Y(k) in accordance with the expression

< / BR>
This sequence Y(k) selective iincl exactly described the evaluation of h(i) of the channel.

In the computing unit 20 is formed of a differential signal between the signal Y(k) at the output of the filter and really the received signal X(k), then formed a measure of the energy of the difference signal, for example, in accordance with the expression

< / BR>
This expression is valid for packet access. In the case of conventional packages summation is from 5 to 26. The reason that the summation in this case starts with a 5, is the fact that the previous value Y(K) depends on the values X(K), which lie outside the accepted installation sequence and therefore is unknown (see above expression for Y(K). However, in the packages first 8 digits that precede the installation sequence is known (the so-called extended tail). So for packages summation can begin with 1.

Finally, the computing unit 22 is formed measure of quality in accordance with the expression:

< / BR>
In this expression, K1- an integer constant to correct dynamics. For the above-mentioned packet access1can have a value of 32768, while acceptable value TO1for normal signaling packet is 8192.

TO2- a constant that obespeche 0. Acceptable value TO2approximately 1000.

The present invention was described above in connection with the so-called packages. However, it is clear that the method in accordance with this invention is also applicable to formation of SQ measures of quality for normal data packets. Furthermore, the method has been described in connection with the European GSM standard. It is clear that the same principles can be used in other mobile digital radio system, for example in the American system in accordance with the standard IS-54.

Specialists in this field it is obvious that the present invention can make various modifications and improvements without departing from its essence and scope defined by the claims.

1. The method of forming SQ measures of quality for the vector signal of the received signal packet in the receiver mobile digital radio, characterized in that to form a comprehensive assessment of h(i) channel of the specified vector signal form the first estimate of ESthe energy of the useful signal in the specified vector signal by calculating the total energy of the specified integrated assessment of h(i) channel, forming a second estimate of Enenergy remained the accordance with expression

< / BR>
where K1and K2- predefined constants.

2. The method according to p. 1, characterized in that the above estimate of the channel includes a predetermined number of consecutive correlation values h(i) between the installation sequence of the received signal packet and exact installation sequence d(k) generated in the receiver.

3. The method according to p. 2, characterized in that the channel contains 5 correlation values h(i).

4. The method according to p. 2 or 3, characterized in that the second evaluation of Enform by calculating the energy of the vector difference signal between the vector formed by the installation sequence X(k) of the received signal packet, and the vector of a sample estimate formed by the filter formed in the receiver installation sequence filter formed of the specified rating h(i) of the channel.

5. The method according to any of the p. 1 - 4, characterized in that K2> 0.

6. The method according to p. 5, characterized in that K21000.

7. The method according to p. 6, characterized in that K1= 32768.

8. The method according to p. 6, characterized in that K1= 8192.

 

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