JP2000049754A - Radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce error of the selection of an optimum path and to improve reception quality by providing a means for executing an integration processing on data obtained by inversely-diffusing a received signal and adaptively controlling the weighting method of the integration processing. SOLUTION: A matched filter 12 inversely diffuses a reception signal and executes correlation. An integrator 13 integrates matched filter output and removes interference components. A path selection circuit 14 selects an optimum path from among outputs. A integration number selection circuit 10 selects the optimum number of integration times, based on the data of the path selection circuit 14. The integrator 13 executes a processing for removing the interference component based on the number and reception data of processing time, until the selection path is obtained is delayed by a data delay device 11 to be transmitted to demodulators 2-4. Thus, the optimum path can be selected and received. The path selection circuit 14 executes weighting, in accordance with input data and the interference component can adaptively be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio apparatus and a base station radio apparatus for performing communication using a spread spectrum communication system, and more particularly to a configuration for reducing errors in selecting an optimal path and improving reception quality. Things.

[0002]

2. Description of the Related Art In a spread spectrum communication system, a digitized voice or digital data signal is multiplied by a code sequence composed of a pseudo-random code, whereby the spread energy of a modulated signal is spread, and this energy is used as a spread spectrum signal. Sent. At the receiver, the received signal is multiplied by the same pseudo-random sequence synchronized with the spreading sequence to recover the modulated signal. Also, due to the multipath effect that causes intersymbol interference, rake combining is used to resolve these effects and generate a modulated signal that can perform satisfactory demodulation.

In a spread spectrum communication system, several different spread spectrum signals transmitted simultaneously at the same or different chip rates at the same frequency are received by an antenna. Each signal experiences a different multipath effect, which causes interference. In addition, everything except my own code was a factor of interference.

As a solution to this problem, it is known that a signal from a transmitter is received at a base station with different power, which causes a problem as a perspective effect. This effect was solved by providing a high-speed power control algorithm.

[0005]

However, in the above-mentioned conventional spread spectrum communication system, the number of codes used increases as the number of users increases, and the correlation level with other channel components increases due to multipath distortion. Therefore, the interference component included in the data channel signal and the control signal for which the correlation is detected increases. As a result, an error occurs in the selection of the optimum path in the synchronization unit, and the communication quality deteriorates.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In a receiving system of a spread spectrum communication system,
An object of the present invention is to provide a radio apparatus capable of reducing errors in selecting an optimal path and improving reception quality.

[0007]

SUMMARY OF THE INVENTION A radio apparatus according to the present invention is provided with means for performing integration processing on data after despreading of a signal received by a reception system of a spread spectrum communication system. In addition, by adaptively controlling the weighting method of the integration process so that the interference signal component is minimized, the synchronization acquisition and the reception quality can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a radio apparatus using a spread spectrum communication system, which arbitrarily integrates a received signal after despreading and adjusts the characteristics of an integrator for removing interference components. This is a base station radio apparatus characterized in that it can be varied, and has an effect that the base station radio apparatus can acquire synchronization and improve reception quality.

According to a second aspect of the present invention, in a radio apparatus using a spread spectrum communication system, it is possible to arbitrarily integrate a received signal after despreading and vary the characteristics of an integrator for removing interference components. The portable wireless device is characterized in that it can perform synchronization acquisition and improve reception quality in the portable wireless device.

According to a third aspect of the present invention, there is provided the integrator according to the first aspect, wherein the bit width of input data to be integrated is varied in accordance with the number of integrations, and the memory for internal operation is reduced. A base station wireless device characterized by the following,
In the base station radio apparatus, the bit width of the input data to be integrated can be varied so that the operation memory can be economical and the synchronization acquisition and the reception quality can be improved.

According to a fourth aspect of the present invention, there is provided the integrator according to the second aspect, wherein the bit width of input data to be integrated is varied in accordance with the number of integrations, and the memory for the internal operation is reduced. The portable wireless device is characterized in that the bit width of the input data to be integrated in the portable wireless device is varied, so that the operation memory can be economical and the synchronization acquisition and the reception quality can be improved. Have.

According to a fifth aspect of the present invention, there is provided a CDMA radio apparatus which performs initial synchronization using the integrator according to the first aspect, via a delay unit for delaying received data by an integrator processing time. A base station radio apparatus characterized by performing inverse correlation by using the integrator according to claim 1 in a base station radio apparatus having a CDMA radio apparatus. Have.

According to a sixth aspect of the present invention, there is provided a CDMA radio apparatus for performing initial synchronization using the integrator according to the second aspect, via a delay unit for delaying received data by an integrator processing time. This portable radio apparatus is characterized by performing inverse correlation, and has an effect that in a portable radio apparatus having a CDMA radio apparatus, initial synchronization can be performed using the integrator according to the second aspect.

According to a seventh aspect of the present invention, in a CDMA radio apparatus using the integrator according to the first aspect, an integral control means for controlling an integral so as to adaptively perform an arbitrary weighting on a received signal. The base station radio apparatus is characterized in that the base station radio apparatus adaptively controls the weighting of the integration processing, thereby achieving synchronization acquisition and improvement of reception quality. Having.

According to an eighth aspect of the present invention, in a CDMA radio apparatus using the integrator according to the second aspect of the present invention, an integral control means for controlling the integral so that an arbitrary weight is adaptively applied to the received signal. The portable wireless device is characterized in that it has a function of adaptively controlling how the integration processing is weighted in the portable wireless device, thereby achieving synchronization acquisition and improvement of reception quality. .

According to a ninth aspect of the present invention, there is provided a CDMA radio apparatus using the integrator according to the first aspect, further comprising a circuit for selecting an optimum integration number. By optimizing the integration number in the base station radio apparatus, there is an effect that synchronization acquisition and reception quality can be improved.

According to a tenth aspect of the present invention, in a CDMA radio apparatus using the integrator according to the second aspect,
A portable wireless device characterized by having a circuit for selecting an optimal number of integrals, wherein synchronization and acquisition quality can be improved by optimizing the number of integrals in the portable wireless device. Having.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an embodiment of a wireless device according to the present invention. This embodiment is a communication system employing a spread spectrum communication system, a radio receiving unit 1 for receiving from a base station, a plurality of demodulators 2 to 4, and a combining unit 5 for combining a plurality of demodulated signals. A reception channel codec unit 6 for converting a radio frame configuration into an arbitrary signal and converting the arbitrary signal into a radio frame, a matched filter 12 for despreading the received signal and taking a correlation, and an output of the matched filter , An integrator 13 for removing interference components, a path selection circuit 14 for selecting an optimum path from the output thereof, and an integration number selection circuit 10 for selecting an optimum number of integrations from data of the path selection circuit 14. A transmission channel codec unit 9 for converting a sound input from the microphone 8 into a digital signal by a codec to generate a transmission frame; It comprises a tuning unit 15, a radio transmission unit 16, a duplexer 17 for switching transmission and reception, an antenna 18 for transmission and reception, and a speaker 7 for making a voice call.

As described above, by integrating (accumulating and adding) the received signal of the spread spectrum communication system,
Interference components can be removed. Here, FIGS. 2 and 3 show how the interference component is removed due to the difference in the number of integrations. 2 and 3, the vertical axis represents the signal level, and the horizontal axis represents time (window width for one symbol).

FIG. 2 shows a case where the number of integrations is two. In this case, an irregular extraneous noise component remains, and there is not much difference between the level difference between the original signal component and the noise component. Is easily mistaken for the original component. FIG.
This is an example where the number of integrations in the case of FIG. 2 is increased to 32. As shown in FIG. 3, the ratio between the noise component and the signal component (where a large peak stands) is large, and the signal component can be easily estimated. Thus, by increasing the number of integrations, the S / N ratio can be improved, and irregular extraneous noise can be removed.

In accordance with an instruction from the path selection circuit 14, an integrator
It is also possible to change the number of integrations of 13 adaptively. Furthermore, by changing the data width used of the output signal of the matched filter 12 by the number of integrations, it becomes possible to make the integrator internal memory the same as the bit width of the input signal,
The internal operation memory can be reduced.

The path selection circuit 14 performs weighting such as mode A and mode B shown in FIG. 4 according to the input data, so that the interference component can be adaptively removed.

The processing time required for the integration number selection circuit 10 to select the optimum number of integrations based on the data of the path selection circuit 14 and for the integrator 13 to perform the processing for removing the interference component based on the selected number of integrations to obtain the selected path. T data received by the data delay unit 11
By transmitting the signals to the demodulators 2, 3, and 4 after delaying the signals, an optimal path can be selected and received. As a result, errors in the selection of the optimum path can be reduced, and the reception quality can be improved.

[0024]

As described above, according to the present invention, in a receiving system of a spread spectrum communication system, means for performing integration processing on data after despreading of a received signal is provided, so that a plurality of receptions and interferences can be performed. By adaptively controlling the weighting of the integration processing so that the signal component is minimized, a wireless device capable of achieving synchronization acquisition and improving reception quality can be realized. The above invention is applicable to both the base station wireless device and the portable wireless device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a wireless device according to an embodiment of the present invention;

FIG. 2 is a diagram showing an example of the number of integration processes (in the case of two integrations);

FIG. 3 is a diagram showing an example of the number of integration processes (in the case of 32 integrations);

FIG. 4 is a table showing that an input bit width can be reduced according to the number of integrations.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless receiving unit 2 demodulator 1 3 demodulator 2 4 demodulator 3 5 combiner 6 reception channel codec 7 speaker 8 microphone 9 transmission channel codec 10 integration number selection circuit 11 data delay unit 12 matched filter 13 integrator 14 pass Selection circuit 15 Modulation unit 16 Wireless transmission unit 17 Duplexer for transmission / reception switching 18 Transmission / reception antenna

Claims (10)

[Claims] In a radio apparatus using a spread spectrum communication system, a base station is characterized in that a received signal after despreading can be arbitrarily integrated and characteristics of an integrator for removing interference components can be varied. Station radio equipment. 2. A portable radio apparatus using a spread spectrum communication system, wherein a received signal after despreading can be arbitrarily integrated and the characteristics of an integrator for removing interference components can be varied. Wireless device. 3. A base station radio apparatus comprising the integrator according to claim 1, wherein the bit width of input data to be integrated is varied in accordance with the number of integrations, and the internal operation memory is reduced. 4. A portable wireless device comprising the integrator according to claim 2, wherein the bit width of input data to be integrated is varied in accordance with the number of integrations, and the number of internal operation memories is reduced. 5. A CDMA receiver for performing initial synchronization using the integrator according to claim 1, wherein inverse correlation is performed via a delay unit for delaying received data by an integrator processing time. Base station radio. 6. A CDMA receiver for performing initial synchronization using the integrator according to claim 2, wherein the inverse correlation is performed via a delay unit for delaying received data by an integrator processing time. Wireless device. 7. CDMA using the integrator according to claim 1.
A base station radio apparatus, wherein the radio apparatus includes integration control means for controlling integration so that an arbitrary weight is adaptively applied to a received signal. 8. CDMA using the integrator according to claim 2.
A portable wireless device, comprising: an integration control means for controlling integration so that an arbitrary weight is adaptively applied to a received signal. 9. A CDMA using the integrator according to claim 1.
A base station radio apparatus comprising a circuit for selecting an optimal integration number in the radio apparatus. 10. A CDM using the integrator according to claim 2.
A portable wireless device having a circuit for selecting an optimal integration number in the wireless device A.