JPH11112367A - Estimating device for radio line quality - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate the radio line quality in a very short time with high precision while hardly affected by transmission line distortion by detecting a desired signal by performing a correlation process using symbols of a received signal, finding the absolute value of a noise signal from the received signal, and calculating the movement means of the detected desired signal and noise absolute value and then estimating the level of the received signal from their ratio. SOLUTION: A correlation process part 1 performs the correlation process by symbols of the received input signal S consisting of the desired signal P and noise signal N to detect the desired signal A(P). A noise detecting process part 3 subtracts the desired signal A(P) from the input signal S to find a noise component and an absolute value acquiring process part 4 finds the absolute value B(N) of the noise. Movement mean process parts 2 and 5 find the movement means A' and B' of the detected values A(P) and B(N) respectively and a calculating process part 6 finds the ratio A'/B'. Then Eb/N0, i.e., 'movement mean value A' of desired signal A/movement mean value B' of noise N' is outputted as a line quality estimated value S0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio channel quality estimating apparatus for estimating radio channel quality in a spread spectrum communication system.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a conventional radio channel quality estimating apparatus. In FIG. 8, an antenna ANT receives a radio signal, for example, a radio signal spread by a pseudo-random signal, and outputs a desired signal by despreading. An antenna 18 is output from the antenna ANT and comprises a desired signal and a noise signal. An RF (high frequency) circuit for amplifying the signal S, 19 is an RSSI (Received Signal Strength Indic)
ator) to detect the level of the received signal and output a channel quality estimation signal S ′, and 20 is a receiver including an RF circuit 18 and a received level detector 19.

[0003] The operation of the radio channel quality estimation device configured as described above will be described.

After receiving a radio wave, a received signal S is transmitted to an antenna AN.
When the signal is output from T, the RF circuit 18 amplifies the reception signal S, and the amplified reception signal S is sent to the reception level detection unit 19. The reception level detection unit 19 detects the level of the reception signal S, and outputs the result as a radio channel quality estimation signal S ′. From the magnitude of the received signal level indicated by the radio channel quality estimation signal S ', the quality of the radio channel is estimated.

[0005]

However, in the conventional radio channel quality estimating apparatus, even when the quality of the received signal is deteriorated due to interference, the received signal level may exceed a desired value. There is a problem that an error occurs in quality estimation.

This radio channel quality estimating apparatus is required to be hardly affected by transmission path distortion and to be able to perform highly accurate radio channel quality estimation within a short time.

The present invention is less susceptible to transmission line distortion,
It is another object of the present invention to provide a wireless channel quality estimating apparatus capable of performing highly accurate wireless channel quality estimation within a short time.

[0008]

SUMMARY OF THE INVENTION In order to solve this problem, a radio channel quality estimating apparatus according to the present invention comprises: an antenna for receiving a radio signal and outputting a reception signal composed of a desired signal and a noise signal; A correlation processing unit that performs a correlation process for each symbol to detect a desired signal, and performs a moving average process on the desired signals for a plurality of symbols detected by the correlation processing unit to obtain a moving average value of the desired signal A first moving average processing unit, a noise detection processing unit that detects a noise signal from a received signal, an absolute value acquisition processing unit that calculates an absolute value of the noise signal detected by the noise detection processing unit, and an absolute value acquisition processing unit A second moving average processing unit for performing a moving average process on the absolute value of the noise signal calculated in the above to obtain a moving average value of the noise signal;
And a calculation processing unit for estimating the level of the received signal from the ratio of the moving average value of the desired signal to the moving average value of the noise signal.

Thus, there is provided a radio channel quality estimating apparatus which is hardly affected by transmission line distortion and can perform radio channel quality estimation with high accuracy within a smile time.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides an antenna for receiving a radio signal and outputting a reception signal composed of a desired signal and a noise signal, and a correlation process for each symbol of the reception signal. And a first moving average processing section for performing a moving average process on a plurality of symbols of the desired signal detected by the correlation processing section to obtain a moving average value of the desired signal. A noise detection processing unit that detects a noise signal from the received signal; an absolute value acquisition processing unit that calculates the absolute value of the noise signal detected by the noise detection processing unit; and a noise signal calculation unit that calculates the absolute value of the noise signal. A second moving average processing section for performing a moving average process on the absolute value to obtain a moving average value of the noise signal, and a level of the received signal based on a ratio between the moving average value of the desired signal and the moving average value of the noise signal. Calculation processing unit for estimating It is obtained by and the level of the received signal has the effect that is estimated from the number to evaluate exactly radio channel quality of the ratio of the moving average of the moving average value and the noise signal of the desired signal.

According to a second aspect of the present invention, there is provided an antenna for receiving a radio signal and outputting a received signal including a desired signal and a noise signal, and detecting a desired signal by performing a correlation process for each symbol of the received signal. A first cyclic integration unit for performing a cyclic integration on the desired signal for one symbol detected by the correlation processing unit to obtain a cyclic integration value of the desired signal, and detecting a noise signal from the received signal A noise detection processing unit, an absolute value acquisition processing unit that calculates an absolute value of the noise signal detected by the noise detection processing unit, and a cyclic integration of one symbol for the absolute value of the noise signal calculated by the absolute value acquisition processing unit. A second cyclic integration processing unit for calculating a cyclic integration value of the noise signal by performing the calculation, and a calculation processing unit for estimating the level of the received signal from the ratio of the cyclic integration value of the desired signal to the cyclic integration value of the noise signal Also , And the level of the received signal has the effect that is estimated from the number to evaluate exactly radio channel quality of the ratio of the cyclic integration value of the cyclic integration values and the noise signal of the desired signal.

According to a third aspect of the present invention, there is provided an antenna for receiving a radio signal and outputting a received signal including a desired signal and a noise signal, and detecting a desired signal by performing a correlation process for each symbol of the received signal. And a first weighted averaging process for obtaining a weighted average value of the desired signal by adding a weighted multiplication value obtained by multiplying the value of the desired signal one symbol before by the weight value to the current desired signal. A noise detection processing unit that detects a noise signal from the received signal; an absolute value acquisition processing unit that calculates an absolute value of the noise signal detected by the noise detection processing unit;
A second weighted average processing unit for obtaining a weighted average value of the noise signal by adding a weighted multiplication value obtained by multiplying the absolute value of the noise signal before the symbol by a weight value to the current noise signal; A calculation processing unit for estimating the level of the received signal from the ratio of the weighted average value to the weighted average value of the noise signal. This has the effect of being estimated from a numerical value for accurately evaluating the quality of the radio channel, ie, the ratio to the weighted average value.

According to a fourth aspect of the present invention, there is provided an antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and detecting a desired signal by performing a correlation process for each symbol of the received signal. A first moving average processing section for performing a moving average process on the desired signals for a plurality of symbols detected by the correlation processing section to obtain a first moving average value of the desired signal; A logical circuit for performing a logical product of the first moving average value and the value of the received signal to obtain a second moving average value of the desired signal; a noise detection processing unit for detecting a noise signal from the received signal; An absolute value acquisition processing unit that calculates the absolute value of the noise signal detected by the processing unit; and a moving average process on the absolute value of the noise signal calculated by the absolute value acquisition processing unit to calculate the moving average value of the noise signal. Desired second moving average processing unit and desired And a calculation processing unit for estimating the level of the received signal from the ratio of the second moving average value of the signal to the moving average value of the noise signal. Has the effect of being accurately estimated from a numerical value for accurately evaluating the radio channel quality, ie, the ratio of the moving average value of the noise signal to the moving average value of the noise signal.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. (Embodiment 1) FIG. 1 is a block diagram showing a radio channel quality estimation device according to Embodiment 1 of the present invention. The radio channel quality estimation device of FIG. 1 corresponds to the receiver 20 of FIG. . In FIG. 1, reference numeral 1 denotes a correlation for inputting a received signal S (= P (i) + N (i)) including a desired signal P (i) and a noise signal N (i) output from an antenna (not shown). Processing unit, 2 is a moving average processing unit, 3 is a noise detection processing unit that detects a noise signal N from the received signal S, 4 is an absolute value acquisition processing unit that calculates the absolute value B of the noise signal N, and 5 is moving average processing , 6 outputs Eb /
N0 (energy per symbol / noise power density) calculation processing unit.

FIG. 2 is a block diagram showing the moving average processing units 2 and 5 constituting the radio channel quality estimating apparatus of FIG. In FIG. 2, reference numeral 7 denotes a shift register corresponding to the number of symbols for which a moving average is obtained, and reference numeral 8 denotes a parallel adder.

The operation of the radio channel quality estimation device configured as described above will be described.

The received signal S affected by the white noise signal N
Is input from the antenna, the received signal S is branched into two signals for detecting a desired signal level and a noise signal level,
Each is used for detecting a desired signal level and for detecting a noise level. The correlation processing section 1 obtains a correlation with the received signal S for detecting the desired signal level, thereby demodulating the received signal S to obtain a desired signal A (that is, a desired signal P).
Then, in the moving average processing unit 2 shown in FIG. 2, the value of the desired signal A as a demodulated received signal is sequentially input to the shift register 7, and the values of the shift registers at the same positions are respectively processed in parallel by the parallel adder 8. By adding, a moving average value A 'of the desired signal is obtained. In order to remove the desired signal A from the received signal S for noise level detection, the desired signal A is removed by using the desired signal A as the received signal S demodulated by the correlation processing unit 1 to leave only the noise signal N. . The noise signal N is input to the absolute value acquisition processing unit 4 to calculate the absolute value B of the noise signal N, and the moving average processing unit 5 performs the same processing as the method of calculating the moving average value A 'of the desired signal A. , A moving average value B ′ of the noise signal N, and a moving average value B ′ of the noise signal N and a moving average value A ′ of the desired signal A are input to the Eb / N0 calculation processing unit 6, and Eb / N0, that is, The moving average value A ′ of the signal A / the moving average value B ′ of the noise signal N) is obtained, and this is output as the radio channel quality estimation signal SO.

As described above, according to the present embodiment, Eb for estimating radio channel quality from signals for a plurality of symbols is used.
Since / N0 can be calculated, it is possible to estimate the radio channel quality in a short time. Further, by performing this process continuously, it is possible to estimate the radio channel quality with higher accuracy. That is, the accuracy of the radio channel quality estimation is improved by using a numerical value that can accurately evaluate the radio channel quality, that is, the ratio of the moving average value A ′ of the desired signal A to the moving average value B ′ of the noise signal N. be able to.

(Embodiment 2) FIG. 3 is a block diagram showing a radio channel quality estimation apparatus according to Embodiment 2 of the present invention. The radio channel quality estimation apparatus of FIG. 3 corresponds to the receiver 20 of FIG. Things. In FIG. 3, the correlation processing unit 1, the noise detection processing unit 3, the absolute value acquisition processing unit 4, and the Eb / N0 calculation processing unit 6 are the same as those in FIG.
Description is omitted. Reference numeral 9 denotes a cyclic integration processing unit for the desired signal A (P), and reference numeral 10 denotes a cyclic integration processing unit for the noise signal N.

FIG. 4 is a block diagram showing the cyclic integration processing units 9 and 10 constituting the radio channel quality estimating apparatus of FIG. FIG.
In the above, reference numeral 11 denotes a shift register having the number of chips existing in one symbol.

The operation of the radio channel quality estimating apparatus configured as described above will be described.

Received signal S affected by white noise signal N
Is input from an antenna (not shown), the received signal S is branched into two signals for detecting a desired signal level and a noise signal level, and each of them is used for a desired signal level detection and a noise signal level detection. The correlation processing section 1 obtains a correlation with the received signal S for detecting the desired signal level, thereby demodulating the received signal S and obtaining the desired signal A. Then, for the value of the desired signal A as the demodulated received signal S, the cyclic integration processing section 9 shown in FIG. The cyclic integration process is performed by performing a feedback process of adding the output signal of No. 11 to the desired signal A, and the value immediately before the reset signal RS generated when the chip signal for one symbol is input is input to the desired signal. A is obtained as a cyclic integral value A ′ of A.

In order to remove the desired signal A, the received signal S for noise signal level detection is used to remove the desired signal A using the desired signal A as the received signal S demodulated by the correlation processing section 1, and only the noise signal N is removed. And The noise signal N is input to the absolute value acquisition processing unit 4 to determine the absolute value B of the noise signal N.
Further, a method in which the cyclic integration processing unit 10 shown in FIG. 4 calculates the cyclic integration value A ′ of the desired signal A with respect to the absolute value B of the noise signal N on the same time axis as the desired signal A obtained above. Is performed, a cyclic integral value B 'of the noise signal N for one symbol is obtained, and the cyclic integral value B' of the noise signal N and the cyclic integral value A 'of the desired signal A are calculated by Eb /
It is input to the N0 calculation processing unit 6, calculates Eb / N0, and outputs this as the radio channel quality estimation signal SO.

As described above, according to the present embodiment, Eb / N for estimating radio channel quality from signals for one symbol
Since the calculation of 0 can be performed, the radio channel quality can be estimated in a much shorter time than in the case of the first embodiment. Further, by performing this process continuously, a more accurate channel quality estimation can be performed. That is, the accuracy of the radio channel quality estimation is improved by using a numerical value, which is a ratio of the cyclic integral value A 'of the desired signal A to the cyclic integral value B' of the noise signal N, for accurately evaluating the radio channel quality. be able to.

(Embodiment 3) FIG. 5 is a block diagram showing a radio channel quality estimation device according to a third embodiment of the present invention. The radio channel quality estimation device of FIG. 5 corresponds to the receiver 20 of FIG. Things. In FIG. 5, the correlation processing unit 1, the noise detection processing unit 3, the absolute value acquisition processing unit 4, and the Eb / N0 calculation processing unit 6 are the same as those in FIG.
Description is omitted. 12 is a weighted average processing unit for the desired signal A,
Reference numeral 13 denotes a weighted average processing unit for the absolute value B of the noise signal N.

FIG. 6 is a block diagram showing the weighted average processing units 12 and 13 constituting the radio channel quality estimating apparatus of FIG. In FIG. 6, reference numeral 14 denotes a weighted average value A 'of the desired signal A.
Is a delay that delays one symbol by one symbol, 15 is a multiplier that obtains a weighted multiplication value by multiplying the weighted average value A ′ delayed by one symbol by a weight value α, and 16 is a weighted multiplication value output from the multiplier 15 and This is an adder that adds the desired signal A to obtain a weighted average value A ′.

The operation of the radio channel quality estimation device configured as described above will be described.

Received signal S affected by white noise signal N
Is input from an antenna (not shown), the received signal S is branched into two signals for detecting a desired signal level and a noise level, and each is used for detecting a desired signal level and for detecting a noise signal level. The correlation processing section 1 obtains a correlation with the received signal S for detecting the desired signal level, thereby demodulating the received signal S and obtaining the desired signal A. Then, the weighted average processing unit 12 shown in FIG. 6 compares the demodulated value of the desired signal A as the received signal S with respect to the one-symbol desired signal A delayed one symbol earlier by the delay unit 14. The weighted average value A ′ is multiplied by a weight α and a weighted multiplied value is added to obtain a desired signal level value A ′ (ie, a weighted average value) A ′ based on the weighted average.

In order to remove the desired signal A from the received signal S for noise level detection, the desired signal A is removed by the noise detection processing unit 3 using the desired signal A as the received signal S demodulated by the correlation processing unit 1. , And only the noise signal N. The noise signal N is input to the absolute value acquisition processing unit 4 to determine the absolute value B of the noise signal N. Further, the weighted average of the desired signal A is calculated using the weighted average processing unit 13 shown in FIG. The same processing is performed, and the weighted average value B ′ of the absolute value B of the noise signal N and the weighted average value A ′ of the desired signal A thus obtained are input to the Eb / N0 calculation processing unit 6, and Eb / N0 is calculated. And outputs this as a radio channel quality estimation signal SO.

As described above, according to the present embodiment, Eb / N for estimating radio channel quality from one symbol signal is used.
Since the calculation of 0 can be performed, the communication line quality can be estimated in a shorter time, and by performing this process continuously, a more accurate line quality estimation can be performed. That is, by using a numerical value that can accurately evaluate the radio channel quality, that is, the ratio between the weighted average value A ′ of the desired signal A and the weighted average value B ′ of the noise signal N, the accuracy of the radio channel quality estimation can be improved. Can be enhanced.

(Embodiment 4) FIG. 7 is a block diagram showing a radio channel quality estimation apparatus according to Embodiment 4 of the present invention. The radio channel quality estimation apparatus of FIG. 7 corresponds to the receiver 20 of FIG. Things. 7, the correlation processing unit 1, the noise detection processing unit 3, the absolute value acquisition processing unit 4, the moving average processing units 2, 5, and the Eb / N0 calculation processing unit 6 are the same as those in FIG. The description is omitted. Reference numeral 17 denotes a desired signal A as a received signal demodulated by the correlation processing unit 1.
And the moving average value A ′ calculated by the moving average processing unit 2
Is a logical circuit that performs a logical product operation on.

FIG. 2 is a block diagram showing the moving average processing units 2 and 5 constituting the radio channel quality estimating apparatus of FIG.

The operation of the radio channel quality estimation device configured as described above will be described.

The received signal S affected by the white noise signal N
Is input from an antenna (not shown), the received signal S is branched into two signals for detecting a desired signal level and a noise signal level, and each of them is used for a desired signal level detection and a noise signal level detection. The correlation processing section 1 obtains a correlation with the received signal S for detecting the desired signal level, thereby demodulating the received signal S and obtaining the desired signal A. Then, in the moving average processing unit 2 shown in FIG. 2, the value of the desired signal A as the demodulated received signal S is sequentially input to the shift register 7, and the values of the shift registers at the same positions are respectively inputted by the parallel adder 8. By parallel addition, a first moving average value A ′ of the desired signal A is obtained. Further, in order to increase the estimation accuracy of the desired signal level, the logic circuit 17 performs a logical product operation on the first moving average value A ′ of the desired signal A and the demodulated received signal S, that is, the desired signal A, and A second moving average value A ″ of A is obtained.

The received signal S for noise signal level detection is used to remove the desired signal A by using the desired signal A as the received signal S demodulated by the correlation processing unit 1 to remove the desired signal A. I do. A method in which the noise signal N is input to the absolute value acquisition processing unit 4 to determine the absolute value B of the noise signal N, and the moving average processing unit 5 determines the first moving average value A ′ of the desired signal A. The same processing is performed to obtain a moving average value B ′ of the noise signal N, and the moving average value B ′ of the noise signal and the second moving average value A ″ of the desired signal A are calculated as Eb / N
0 is input to the calculation unit 8 to obtain Eb / N0, which is output as a radio channel quality estimation signal SO.

As described above, according to the present embodiment, Eb for radio channel quality estimation from signals for a plurality of symbols is used.
/ N0 can be calculated, and the logic circuit 17 also considers the information of the latest desired signal A of the received signal S.
Estimation of communication line quality in a shorter time can be performed with higher accuracy. Further, by performing this processing continuously, it is possible to estimate the radio channel quality with higher accuracy. That is, by using a numerical value, which is a ratio between the second moving average value A ″ of the desired signal A and the moving average value B ′ of the noise signal N, for accurately evaluating the radio channel quality, the radio channel quality estimation is performed. Accuracy can be improved.

[0037]

As described above, according to the radio channel quality estimating apparatus of the first aspect of the present invention, an antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal;
A correlation processing unit that performs a correlation process for each symbol of the received signal to detect a desired signal; and a moving average process of performing a moving average process on a plurality of symbols of the desired signal detected by the correlation processing unit to obtain a moving average value of the desired signal. A first moving average processing unit for obtaining a noise signal, a noise detection processing unit for detecting a noise signal from the received signal, an absolute value acquisition processing unit for calculating an absolute value of the noise signal detected by the noise detection processing unit, and an absolute value acquisition A second moving average processing unit that performs a moving average process on the absolute value of the noise signal calculated by the processing unit to obtain a moving average value of the noise signal; a moving average value of the desired signal and a moving average value of the noise signal And a calculation processing unit that estimates the level of the received signal from the ratio of
Since the level of the received signal can be estimated from a numerical value for accurately evaluating the radio channel quality, that is, the ratio of the moving average value of the desired signal to the moving average value of the noise signal, the level of the received signal is hardly affected by transmission line distortion, and An advantageous effect is obtained in that highly accurate radio channel quality estimation can be performed within a small time period of a symbol.

According to the second aspect of the present invention, an antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and performing a correlation process for each symbol of the received signal to obtain a desired signal , A first cyclic integration processing unit for performing a cyclic integration on one symbol of the desired signal detected by the correlation processing unit to obtain a cyclic integration value of the desired signal, and a noise signal from the received signal. A noise detection processing unit for detection, an absolute value acquisition processing unit for calculating an absolute value of the noise signal detected by the noise detection processing unit, and a one-symbol tour of the absolute value of the noise signal calculated by the absolute value acquisition processing unit A second cyclic integration processing unit that performs integration to obtain a cyclic integration value of the noise signal; and a calculation processing unit that estimates the level of the received signal from a ratio between the cyclic integration value of the desired signal and the cyclic integration value of the noise signal. Having and The level of the received signal can be estimated from the ratio of the cyclic integral value of the desired signal to the cyclic integral value of the noise signal, which is a value that accurately evaluates the quality of the radio channel. An advantageous effect is obtained that radio channel quality estimation can be performed with high accuracy within a short time of one symbol.

According to the third aspect of the present invention, an antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and performing a correlation process for each symbol of the received signal to obtain a desired signal And a first weight for obtaining a weighted average value of the desired signal by adding a weighted multiplication value obtained by multiplying the value of the desired signal one symbol before by the weight value to the current desired signal. An averaging processing unit, a noise detection processing unit that detects a noise signal from the received signal, an absolute value acquisition processing unit that calculates the absolute value of the noise signal detected by the noise detection processing unit, and an absolute value of the noise signal one symbol before A second weighted average processing unit for obtaining a weighted average value of the noise signal by adding a weighted multiplication value obtained by multiplying the current noise signal to the current noise signal, and a weighted average value of the desired signal and the weighting of the noise signal The ratio of the received signal And a calculation processing unit for estimating the bell, and the level of the received signal is calculated from a value for accurately evaluating the radio channel quality, which is the ratio of the weighted average value of the desired signal to the weighted average value of the noise signal. Since the estimation can be performed, there is obtained an advantageous effect that the wireless channel quality is hardly affected by transmission path distortion and highly accurate radio channel quality estimation can be performed within a short time of one symbol.

According to the fourth aspect of the present invention, an antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and performing a correlation process for each symbol of the received signal to obtain a desired signal A first moving average processing unit that performs a moving average process on the desired signals for a plurality of symbols detected by the correlation processing unit to obtain a first moving average value of the desired signal; A logic circuit for performing a logical product of the first moving average value of the desired signal and the value of the received signal to obtain a second moving average value of the desired signal; a noise detection processing unit for detecting a noise signal from the received signal; An absolute value acquisition processing unit that calculates the absolute value of the noise signal detected by the noise detection processing unit; and a moving average of the noise signal by performing a moving average process on the absolute value of the noise signal calculated by the absolute value acquisition processing unit A second moving average processing unit for obtaining a value; And a calculation processing unit for estimating the level of the received signal from the ratio of the second moving average of the desired signal to the moving average of the noise signal. 2 can be accurately estimated from the numerical value for evaluating the radio channel quality, that is, the ratio of the moving average value of the noise signal to the moving average value of the noise signal. An advantageous effect that accurate radio channel quality estimation can be performed is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a radio channel quality estimation device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a moving average processing unit included in the radio channel quality estimation device of FIGS. 1 and 7;

FIG. 3 is a block diagram showing a radio channel quality estimation device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a cyclic integration processing unit included in the wireless channel quality estimation device of FIG. 3;

FIG. 5 is a block diagram showing a radio channel quality estimation device according to a third embodiment of the present invention.

FIG. 6 is a block diagram illustrating a weighted average processing unit included in the wireless channel quality estimating apparatus of FIG. 5;

FIG. 7 is a block diagram showing a radio channel quality estimation device according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing a conventional radio channel quality estimation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Correlation processing part 2, 5 Moving average processing part 3 Noise detection processing part 4 Absolute value acquisition processing part 6 Eb / N0 calculation processing part 7, 11 Shift register 8 Parallel adder 9, 10 Cyclic integration processing part 12, 13 Weighted average Processing unit 14 Delay unit 15 Multiplier 16 Adder 17 Logic circuit

Claims (4)

[Claims] An antenna for receiving a radio signal and outputting a reception signal composed of a desired signal and a noise signal; and a correlation processing unit for performing a correlation process for each symbol of the received signal to detect the desired signal. A first moving average processing unit for performing a moving average process on the desired signals for a plurality of symbols detected by the correlation processing unit to obtain a moving average value of the desired signal; A noise detection processing unit for detecting, an absolute value acquisition processing unit for calculating an absolute value of the noise signal detected by the noise detection processing unit, and an absolute value of the noise signal calculated by the absolute value acquisition processing unit. A second moving average processing unit for performing a moving average process to obtain a moving average value of the noise signal; and estimating a level of the received signal from a ratio of a moving average value of the desired signal to a moving average value of the noise signal. Calculation processing Radio channel quality estimation apparatus characterized by having and. 2. An antenna for receiving a radio signal and outputting a reception signal composed of a desired signal and a noise signal, and a correlation processing unit for performing a correlation process for each symbol of the received signal to detect the desired signal. A first cyclic integration processing unit for performing a cyclic integration on the desired signal for one symbol detected by the correlation processing unit to obtain a cyclic integration value of the desired signal;
A noise detection processing unit that detects a noise signal from the received signal, an absolute value acquisition processing unit that calculates an absolute value of the noise signal detected by the noise detection processing unit, and the noise calculated by the absolute value acquisition processing unit A second cyclic integration processing unit for performing cyclic integration for one symbol on the absolute value of the signal to obtain a cyclic integration value of the noise signal; and a ratio between the cyclic integration value of the desired signal and the cyclic integration value of the noise signal. And a calculation processing unit for estimating the level of the received signal from the radio channel quality estimation apparatus. 3. An antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and a correlation processing unit for performing a correlation process for each symbol of the received signal and detecting the desired signal. A first weighted average processing unit for obtaining a weighted average value of the desired signal by adding a weighted multiplication value obtained by multiplying a value of the desired signal one symbol before by a weight value to the current desired signal; A noise detection processing unit for detecting a noise signal from a received signal; an absolute value acquisition processing unit for calculating an absolute value of the noise signal detected by the noise detection processing unit; and a weighting value for the absolute value of the noise signal one symbol before. A second weighted average processing unit for obtaining a weighted average value of the noise signal by adding a weighted multiplied value obtained by the multiplication to the current noise signal; and a weighted average value of the desired signal and a weighted average of the noise signal. From the ratio with the value Radio channel quality estimation apparatus; and a calculation processing unit for estimating the level of the degree. 4. An antenna for receiving a radio signal and outputting a received signal composed of a desired signal and a noise signal, and a correlation processing unit for performing a correlation process for each symbol of the received signal to detect the desired signal. A first moving average processing section for performing a moving average process on the desired signals for a plurality of symbols detected by the correlation processing section to obtain a first moving average value of the desired signal; A logic circuit for performing a logical product of a first moving average value and the value of the received signal to obtain a second moving average value of the desired signal; a noise detection processing unit for detecting a noise signal from the received signal; An absolute value acquisition processing unit that calculates an absolute value of the noise signal detected by the noise detection processing unit, and performs a moving average process on the absolute value of the noise signal calculated by the absolute value acquisition processing unit to perform the noise calculation. Find the moving average of a signal 2 a moving average processing unit, and a calculation processing unit for estimating the level of the received signal from a ratio between a second moving average value of the desired signal and a moving average value of the noise signal. Line quality estimation device.