JP4090455B2 - Amplification method and communication device using the same - Google Patents

Description

  The present invention relates to an amplification technique, and more particularly to an amplification method for amplifying signals received by a plurality of antennas and a communication apparatus using the amplification method.

  In wireless communication, effective use of limited frequency resources is generally desired. In order to effectively use frequency resources, for example, radio waves of the same frequency are repeatedly used at a distance as close as possible. However, in that case, communication quality deteriorates due to co-channel interference from a nearby base station apparatus or the like using the same frequency. One technique for preventing deterioration in communication quality due to co-channel interference is the adaptive array antenna technique. In the adaptive array antenna technology, signals received by a plurality of antennas are weighted with different weighting factors and then combined. For example, the weighting factor is adaptively updated so as to reduce an error between the signal to be referred to and the combined signal.

For adaptive updating of the weighting factor, for example, an adaptive algorithm such as an RLS (Recursive Least Squares) algorithm or an LMS (Least Mean Squares) algorithm is used. The weighting factor may be calculated based on the response factor in the transmission path from the transmitting side to the receiving side. Further, a radio apparatus equipped with adaptive array antenna technology derives a weighting factor for transmission based on a weighting factor and a response factor derived from the received signal, and weights the signal to be transmitted with the weighting factor for transmission. There is also a case of sending after. As described above, the adaptive array antenna technology extracts a desired component from the received signal and adjusts the directivity when transmitting the signal, so that it is possible to prevent deterioration in communication quality due to co-channel interference (for example, Patent Documents). 1).
International Publication No. WO00 / 079702 Pamphlet

  A base station apparatus that supports adaptive array antenna technology generally amplifies signals received by a plurality of antennas by a plurality of AGCs, converts the signals to digital signals, and executes adaptive array processing. In order to increase the accuracy of adaptive array processing, it is better that the relationship of amplitude values between signals amplified by AGC is closer to the relationship of amplitude values between signals before amplification by AGC. For example, when the amplitudes of three signals are in the relationship of “1: 2: 3”, the amplitude relationship of “1: 2: 3” is maintained even after the three signals are amplified by AGC. Is good. That is, it is desirable to amplify by AGC while maintaining a relationship between a plurality of signals. In general, the amplifiers included in the AGC have individual differences, and the individual differences are stored in advance by calibration. For example, the amplification factor is determined based on one of a plurality of AGCs, and the remaining AGCs correct the determined amplification factor based on individual differences stored in advance to obtain respective amplification factors.

  Under such circumstances, the present inventor has come to recognize the following problems. When determining the amplification factors of other AGCs based on the amplification factors determined by one AGC, the amplification factors of the other AGCs are uniformly determined. By such processing, the respective amplification factors are held at substantially the same value, but the amplification factors may not be optimal values. For example, in the case of a weak electric field, even in this case, since the plurality of AGCs perform amplification within a range in which linearity can be maintained, the dynamic range of AGC is not utilized to the maximum extent. That is, even after amplification by AGC, the signal power is increased only to a certain extent, and the amplification is not sufficiently performed. As a result, an error occurs in subsequent signal processing due to the influence of noise or the like.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an amplification method for performing amplification so as to maintain a predetermined quality even in the case of a weak electric field, and a communication device using the amplification method. It is in.

  One embodiment of the present invention is a communication device. The apparatus includes a receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and a measuring unit that measures the strengths of the plurality of signals received by the receiving unit. Based on the measured strengths of the plurality of signals, select one of the plurality of received signals to be a reference signal and derive an amplification factor for the reference signal, A deriving unit for deriving the relative relationship of the intensity between the rest of the signal and the reference signal, and an amplification factor for amplifying the reference signal among the plurality of received signals with the gain obtained by deriving the remaining signal And an amplifying unit that amplifies the signals based on the derived relative strength relationship, and a processing unit that adaptively processes a plurality of amplified signals. According to this device, the deriving unit derives a plurality of amplification factors for the received plurality of signals, respectively, when the intensity of the plurality of signals measured by the measurement unit is smaller than a predetermined threshold value. A plurality of received signals may be amplified with a plurality of derived amplification factors.

  With the above devices, if the intensity of multiple signals is large, the amplification factors are derived while maintaining the relationship between the multiple signals, so the multiple amplification factors are derived so as to maintain the relative relationship between the amplified signals. If the intensity of the plurality of signals is small, the amplification factors are individually derived from the plurality of signals, so that the amplification factors suitable for each of the plurality of signals can be derived.

  Another aspect of the present invention is also a communication device. The apparatus includes a receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and a measuring unit that measures the strengths of the plurality of signals received by the receiving unit. Based on the measured strengths of the plurality of signals, select one of the plurality of received signals to be a reference signal and derive an amplification factor for the reference signal, A deriving unit for deriving the relative relationship of the intensity between the rest of the signal and the reference signal, and the amplification factor obtained by amplifying the reference signal among the plurality of received signals with the amplification factor derived, and deriving the remainder And an amplifying unit that amplifies the signals based on the derived relative strength relationship, and a processing unit that adaptively processes a plurality of amplified signals. According to this apparatus, if the intensity of the plurality of signals measured by the measurement unit is equal to or greater than a predetermined threshold value, the derivation unit outputs a signal corresponding to the larger intensity of the measured plurality of signals. If the intensity of a plurality of signals selected as a reference signal and measured by the measurement unit is smaller than a predetermined threshold value, a signal corresponding to the smaller intensity of the measured signals is used as a reference signal. You may choose.

“Large” and “smaller” indicate, for example, a maximum value and a minimum value, but are not limited to these, and a value corresponding to the characteristics of the amplifying unit or the like may be selected.
With the above device, if the intensity of a plurality of signals is large, the amplification factor is derived with reference to the larger one of the plurality of signals while relating to the plurality of signals. The multiple amplification factors can be derived so that the relative relationship between the multiple signals can be derived. If the strength of the multiple signals is small, the smaller one of the multiple signals can be used as a reference while the multiple signals are related. Thus, since the amplification factor is derived, a large amplification factor can be derived.

  Yet another embodiment of the present invention is also a communication device. The apparatus includes a receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and a measuring unit that measures the strengths of the plurality of signals received by the receiving unit. Based on the measured strengths of the plurality of signals, select one of the plurality of received signals to be a reference signal and derive an amplification factor for the reference signal, A deriving unit for deriving the relative relationship of the intensity between the rest of the signal and the reference signal, and the amplification factor obtained by amplifying the reference signal among the plurality of received signals with the amplification factor derived, and deriving the remainder And an amplifying unit that amplifies the signals based on the derived relative strength relationship, and a processing unit that adaptively processes a plurality of amplified signals. According to this apparatus, the deriving unit may add a predetermined value to the derived amplification factor if the intensity of the plurality of signals measured by the measuring unit is smaller than a predetermined threshold.

  With the above device, if the intensity of a plurality of signals is large, the amplification factor is derived with reference to the larger one of the plurality of signals while relating to the plurality of signals. A plurality of amplification factors can be derived so as to maintain the relative relationship between them. If the intensity of the plurality of signals is small, a predetermined value is added to the derived amplification factors, so that a large amplification factor can be derived.

  A decision unit for deriving a transmission channel characteristic based on the transmission channel characteristic derived by adaptive array processing in the processing unit, and a weight to a signal to be transmitted based on the transmission channel characteristic And a transmitter that transmits from the plurality of antennas, and the transmitter is configured to transmit signals from the plurality of antennas when the intensity of the plurality of signals measured by the measuring unit is smaller than a predetermined threshold. The intensity may be weakened by a predetermined value.

  The “reception transmission path characteristics” indicate the characteristics of the transmission path in the received signal, and may be anything corresponding to the characteristics of the transmission path. For example, a reception response vector, a reception weight vector, and reception power are included.

  The “transmission channel characteristics” indicate the characteristics of the transmission path with respect to the signal to be transmitted, and may be anything corresponding to the characteristics of the transmission path. For example, a transmission response vector and a transmission weight vector are included. It is assumed that the value of “transmission channel characteristics” may be the same as the value of “reception transmission path characteristics”.

  Yet another embodiment of the present invention is an amplification method. The method includes a step of receiving a total number of signals equal to the number of the plurality of antennas through each of the plurality of antennas, respectively measuring the strengths of the received plurality of signals, and measuring the strengths of the plurality of signals. Based on the received signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals and the reference signal are determined. A step of deriving the relative strength between the signals, amplifying the reference signal among the received signals at the amplification factor derived, and based on the relative relationship between the derived amplification factor and the derived strength And amplifying. According to this method, the step of deriving includes deriving and amplifying a plurality of amplification factors for the plurality of received signals, respectively, if the measured intensities of the plurality of signals are smaller than a predetermined threshold. Each of the amplified signals may be amplified with a plurality of amplification factors derived.

  Yet another embodiment of the present invention is also an amplification method. The method includes a step of receiving a total number of signals equal to the number of the plurality of antennas through each of the plurality of antennas, respectively measuring the strengths of the received plurality of signals, and measuring the strengths of the plurality of signals. Based on the received signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals and the reference signal are determined. A step of deriving the relative strength between the signals, amplifying the reference signal among the received signals at the amplification factor derived, and based on the relative relationship between the derived amplification factor and the derived strength And amplifying. According to this method, in the step of deriving, if the intensity of the plurality of measured signals is equal to or greater than a predetermined threshold, a signal corresponding to the larger intensity of the plurality of measured signals is used as a reference. If the intensity of the plurality of signals selected as the signal is smaller than a predetermined threshold value, the signal corresponding to the smaller intensity of the plurality of signals measured may be selected as the reference signal. .

  Yet another embodiment of the present invention is also an amplification method. The method includes a step of receiving a total number of signals equal to the number of the plurality of antennas through each of the plurality of antennas, respectively measuring the strengths of the received plurality of signals, and measuring the strengths of the plurality of signals. Based on the received signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals and the reference signal are determined. A step of deriving the relative strength between the signals, amplifying the reference signal among the received signals at the amplification factor derived, and based on the relative relationship between the derived amplification factor and the derived strength And amplifying. According to this method, the deriving step may add a predetermined value to the derived amplification factor if the measured intensities of the plurality of signals are smaller than a predetermined threshold.

  If the measured strengths of the plurality of signals become smaller than a predetermined threshold value, the method may further comprise a step of weakening the strength of signals to be transmitted from the plurality of antennas by a predetermined value.

  Yet another embodiment of the present invention is a program. The program receives from the wireless network via each of the plurality of antennas a total number of signals equal to the number of the plurality of antennas, and measures the strengths of the received plurality of signals respectively. Based on the intensity of the signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals Deriving the relative relationship of the intensity with the reference signal, storing the correlation between the derived amplification factor and the derived intensity in the memory, respectively, and storing the reference signal among the plurality of received signals And amplifying with the amplification factor and controlling the amplifier to amplify based on the relative relationship between the amplification factor storing the remainder and the stored intensity. In this program, the storing step derives a plurality of amplification factors for the received signals when the measured intensities of the plurality of signals are smaller than a predetermined threshold value, and stores the derived plurality of amplification factors in the memory. In the step of storing and controlling each of the amplifiers, the amplifiers may be controlled to amplify the received signals at a plurality of stored amplification factors.

  Yet another embodiment of the present invention is also a program. The program receives from the wireless network via each of the plurality of antennas a total number of signals equal to the number of the plurality of antennas, and measures the strengths of the received plurality of signals respectively. Based on the intensity of the signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals Deriving the relative relationship of the intensity with the reference signal, storing the correlation between the derived amplification factor and the derived intensity in the memory, respectively, and storing the reference signal among the plurality of received signals And amplifying with the amplification factor and controlling the amplifier to amplify based on the relative relationship between the amplification factor storing the remainder and the stored intensity. In this program, if the intensity of the measured signals is equal to or greater than a predetermined threshold, the signal corresponding to the larger intensity of the measured signals is used as a reference signal. If the selected and measured intensities of the plurality of signals are smaller than a predetermined threshold, a signal corresponding to the smaller one of the intensities of the plurality of measured signals may be selected as the reference signal.

  Yet another embodiment of the present invention is also a program. The program receives from the wireless network via each of the plurality of antennas a total number of signals equal to the number of the plurality of antennas, and measures the strengths of the received plurality of signals respectively. Based on the intensity of the signal, one of the plurality of received signals to be a reference signal is selected, and an amplification factor for the reference signal is derived, and the remaining of the received signals Deriving the relative relationship of the intensity with the reference signal, storing the correlation between the derived amplification factor and the derived intensity in the memory, respectively, and storing the reference signal among the plurality of received signals And amplifying with the amplification factor and controlling the amplifier to amplify based on the relative relationship between the amplification factor storing the remainder and the stored intensity. In this program, the storing step may add a predetermined value stored in the memory in advance to the derived amplification factor if the measured intensities of the plurality of signals become smaller than a predetermined threshold value.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, even in the case of a weak electric field, amplification can be performed so as to maintain a predetermined quality.

Example 1
Before describing the present invention in detail, an outline will be described. Embodiment 1 of the present invention relates to a base station apparatus of a simple mobile phone system. The base station apparatus according to the present embodiment includes a plurality of antennas and executes adaptive array processing. Therefore, a plurality of AGCs are provided to correspond to each of the plurality of antennas. The base station apparatus measures RSSI as the intensity of signals received by a plurality of antennas, and the total measured RSSI is equal to or greater than a predetermined threshold (hereinafter referred to as “normal state”). The amplification factor is determined as follows. A maximum value is selected from a plurality of RSSIs (hereinafter, the selected maximum value is referred to as “reference value”), and an amplification factor is derived for a signal corresponding to the reference value (hereinafter referred to as “reference signal”). In addition, values corresponding to individual differences among a plurality of AGCs (hereinafter referred to as “offset values”) are stored in advance, and a plurality of signals other than the reference signal are amplified from the derived amplification factor and the stored offset value. Determine the rate. Based on the amplification factors determined in this way, the plurality of AGCs amplify the received signals, respectively.

  On the other hand, the base station apparatus has a measured total RSSI smaller than a predetermined threshold (hereinafter referred to as “weak electric field state”). The amplification factor is determined as follows. The amplification factors for a plurality of signals are determined independently. Based on the amplification factors determined in this way, the plurality of AGCs amplify the received signals, respectively. Therefore, a signal received by a plurality of AGCs with a somewhat high amplification factor can be amplified, and the accuracy of subsequent signal processing is also increased. In particular, in a mobile communication system such as a simple mobile phone system, the level of a signal transmitted from a terminal device is lower than the level of a signal transmitted from a base station device. It is assumed that the limit of intensity is reached, and this embodiment solves this.

  Note that the relationship between the amplified signals is not maintained by such processing, and the reception weight vector and the transmission weight vector derived based on the amplified signal are not optimum values. However, since the beam has a certain extent with respect to the former, even if the directivity control is somewhat disrupted, the decrease in the beam level in the desired direction can be small. On the other hand, if the directivity control at the time of transmission is lost, there is a risk of interference with other terminal devices. The base station apparatus according to the present embodiment attenuates transmission power as a countermeasure.

  FIG. 1 illustrates a configuration of a communication system 100 according to the first embodiment. The communication system 100 includes a base station device 10, a terminal device 26, and a network 24. The base station apparatus 10 includes a first antenna 22a, a second antenna 22b, an nth antenna 22n, a radio unit 12, a signal processing unit 14, a modem unit 16, a baseband unit 18, a control unit 20, and a measurement unit, which are collectively referred to as an antenna 22. 230 and a derivation unit 232, which are connected to the network 24. The radio unit 12 includes a first radio unit 12a, a second radio unit 12b, and an Nth radio unit 12n. In addition, as a signal, a first digital reception signal 300a, a second digital reception signal 300b, an Nth digital reception signal 300n, which are collectively referred to as a digital reception signal 300, a first digital transmission signal 302a, which is collectively referred to as a digital transmission signal 302, and a second digital reception signal 300b. 2 digital transmission signal 302b, Nth digital transmission signal 302n, radio unit control signal 318, modem unit control signal 320, baseband unit control signal 322, signal processing unit control signal 330, amplification factor signal 340, and measurement result signal 342 . In the communication system of FIG. 1, the base station apparatus 10 is connected to one terminal apparatus 26, but a plurality of terminal apparatuses 26 can actually be connected.

The antenna 22 performs transmission / reception processing of radio frequency signals. The antenna directivity may be arbitrary, and the number of antennas 22 is N.
The radio unit 12 performs frequency conversion processing, amplification processing, AD or DA conversion processing between a baseband signal and a radio frequency signal processed by a signal processing unit 14, a modem unit 16, and a baseband unit 18, which will be described later. . As a reception function, the radio unit 12 receives a number of signals equal to the total number of the plurality of antennas via each of the plurality of antennas 22. Also, a plurality of amplification factors included in the amplification factor signal 340 and determined by the deriving unit 232 are input so as to correspond to each of the plurality of received signals. Furthermore, each of the received signals is amplified with a plurality of amplification factors. Although details will be described later, a signal that has been amplified and AD converted is referred to as a digital reception signal 300, and a signal to be transmitted before DA conversion is referred to as a digital transmission signal 302. As a transmission function, transmission power control may be performed.

  The measurement unit 230 receives a signal from the radio unit 12 and measures the intensity of the input signal, for example, RSSI. Here, there are a plurality of signals corresponding to the plurality of antennas 22, but these are shown as one signal line for the sake of clarity of the drawing. The measurement unit 230 outputs the measured RSSI as the measurement result signal 342 to the derivation unit 232.

  The deriving unit 232 derives a plurality of amplification factors used in the amplification process in the radio unit 12 as follows. A plurality of RSSIs input from the measurement unit 230 and corresponding to the plurality of antennas 22 are added (this is referred to as “total RSSI”). Further, the total RSSI is compared with a predetermined threshold, and a plurality of amplification factors are derived by another method when the total RSSI is equal to or greater than the threshold and when the total RSSI is smaller than the threshold. In the case of the former normal state, one is selected as a reference value from among a plurality of RSSIs. Here, the maximum RSSI is used as a reference value. Furthermore, an amplification factor for the digital reception signal 300 corresponding to the reference signal is derived. In addition, an offset value for the reference signal is stored in advance, and an amplification factor for the digital reception signal 300 corresponding to a signal other than the reference signal is derived based on the amplification factor and the offset value derived for the reference signal. As a result, the deriving unit 232 determines a plurality of amplification factors and outputs them as the amplification factor signal 340.

  In the case of the latter weak electric field state, a plurality of amplification factors for each of the plurality of digital reception signals 300 are derived independently. Further, the deriving unit 232 outputs the derived plurality of amplification factors as the amplification factor signal 340. In addition, the derivation unit 232 instructs the radio unit 12 to weaken the strength of signals to be transmitted from the plurality of antennas 22 by a predetermined value when the processing of the weak electric field state is executed. That is, transmission power control is executed.

  The signal processing unit 14 performs signal processing necessary for executing transmission / reception processing by the adaptive array antenna. Although details will be described later, in the reception process, a reception response vector or a reception response vector is derived as a transmission channel characteristic for reception in order to execute adaptive array processing. In the transmission process, transmission channel characteristics such as a transmission weight vector are derived based on the derived reception response vector and reception response vector. Further, the signal to be transmitted is weighted and output based on the derived transmission weight vector.

  The modem unit 16 modulates an information signal to be transmitted by a modulation method of π / 4 shift QPSK (Quadrature Phase Shift Keying) as modulation processing. Further, as a demodulation process, the received signal is demodulated and the transmitted information signal is reproduced. An instruction necessary for executing the modulation process and the demodulation process is given from the control unit 20 by the modem unit control signal 320.

  The baseband unit 18 is an interface with the network 24, and performs transmission / reception processing of an information signal to be transmitted in the communication system. Further, error correction and automatic retransmission processing may be performed, but description thereof is omitted here.

  The control unit 20 controls the timing and channel arrangement of the radio unit 12, the signal processing unit 14, the modem unit 16, and the baseband unit 18.

  FIG. 2 shows a burst format according to the first embodiment. This is a burst format of a simple mobile phone system. A preamble for use in timing synchronization is arranged between the four symbols from the head of the burst, and a unique word is arranged between the following eight symbols. Since the preamble and the unique word are known to the base station device 10 and the terminal device 26, they can also be used as training signals described later. In the present embodiment, for the sake of simplicity of explanation, the burst format of the simplified mobile phone system shown in FIG. 2 will be described, but the present invention is not limited to this.

  FIG. 3 shows a configuration of the first radio unit 12a. The first radio unit 12a includes a switch unit 36, a receiving unit 38, and a transmitting unit 40. Furthermore, the reception unit 38 includes a frequency conversion unit 42, a quadrature detection unit 44, an AGC (Automatic Gain Control) 46, and an AD conversion unit 48. The transmission unit 40 includes an amplification unit 50, a frequency conversion unit 52, and a quadrature modulation unit 54. DA converter 56 is included.

The switch unit 36 switches input / output of signals to and from the reception unit 38 and the transmission unit 40 based on an instruction of the radio unit control signal 318.
The frequency conversion unit 42 of the reception unit 38 and the frequency conversion unit 52 of the transmission unit 40 perform frequency conversion between a radio frequency signal and one or a plurality of intermediate frequency signals.

  The quadrature detection unit 44 generates a baseband analog signal from the intermediate frequency signal through quadrature detection. In general, a baseband signal contains two components, an in-phase component and a quadrature component, so it should be indicated by two signal lines. Shown by signal line. The same applies to the following. On the other hand, the quadrature modulation unit 54 generates an intermediate frequency signal from the baseband analog signal by quadrature modulation.

  The AGC 46 automatically controls the gain so that the amplitude of the baseband analog signal is within the dynamic range of the AD converter 48. Here, the gain is set by the gain signal 340 of FIG.

The AD converter 48 converts the baseband analog signal into a digital signal, and the DA converter 56 converts the baseband digital signal into an analog signal. Here, a digital signal output from the AD conversion unit 48 is a digital reception signal 300, and a digital signal input to the DA conversion unit 56 is a digital transmission signal 302.
The amplifying unit 50 amplifies a radio frequency signal to be transmitted.

  FIG. 4 shows the configuration of the measurement unit 230 and the derivation unit 232. 4 shows the measurement unit 230 and the derivation unit 232 shown in FIG. 1, and the AGC 46 and the AD conversion unit 48 shown in FIG. 3. In order to facilitate understanding of the present embodiment, other components are shown. Was omitted. The first AGC 46a, the second AGC 46b, and the NAGC 46n are collectively referred to as AGC 46. The first AD conversion unit 48a, the second AD conversion unit 48b, and the NAD conversion unit 48n are collectively referred to as the AD conversion unit 48. The AGC 46 includes a first amplifying unit 234a, a second amplifying unit 234b, an N-th amplifying unit 234n, which are collectively referred to as an amplifying unit 234, a first setting unit 236a, a second setting unit 236b, which are collectively referred to as a setting unit 236, and an N-th setting. Each part 236n is included.

  The amplification unit 234 amplifies the input signal based on the amplification factor set by the setting unit 236. The measurement unit 230 measures the RSSI of the input signal. Further, the measurement unit 230 outputs the measured RSSI to the derivation unit 232.

  The deriving unit 232 derives the amplification factor for the AGC 46 as described above. The deriving unit 232 determines a normal state or a weak electric field state based on the measurement result signal 342. Based on the determined normal state or weak electric field state, the amplification factor signal 340 is derived by different methods and output to the setting unit 236. A more detailed description of the derivation unit 232 will be described later.

  FIG. 5 shows the configuration of the derivation unit 232. The derivation unit 232 includes a first selection unit 240, a second selection unit 242, a first amplification factor determination unit 244a, a second amplification factor determination unit 244b, an Nth amplification factor determination unit 244n, which are collectively referred to as an amplification factor determination unit 244, An offset value determination unit 246 and a final determination unit 248 are included.

  The first selection unit 240 receives the measurement result signal 342 and selects a maximum value from a plurality of RSSIs as a reference value. Further, a digital reception signal 300 is also input, and one digital reception signal 300 corresponding to the selected reference value is selected as a reference signal. The first selection unit 240 outputs the selected reference signal to the first amplification factor determination unit 244a, and outputs the digital reception signal 300 other than the reference signal to the second selection unit 242.

  The second selection unit 242 receives the measurement result signal 342 and calculates the total RSSI from a plurality of RSSIs. Further, a threshold value is stored in advance, and a normal state or a weak electric field state is determined based on a comparison between the total RSSI and the threshold value. The second selection unit 242 outputs the digital reception signal 300 input from the first selection unit 240 to the offset value determination unit 246 when it is determined as a normal state, and when it is determined as a weak electric field state, the first selection unit 242 The digital reception signal 300 input from 240 is output from the second amplification factor determination unit 244b to the Nth amplification factor determination unit 244n.

  The first amplification factor determination unit 244a derives the amplification factor based on the difference between the amplitude of the input reference signal and the target value so that the amplitude of the input reference signal approaches the target value. . Note that the method for amplifying the amplification factor may be other than this.

  The offset value determination unit 246 stores an offset value corresponding to the reference signal in advance. The format of the offset value to be stored may be arbitrary. For example, the offset value of the remaining amplifying units 234 with respect to one of the amplifying units 234 may be stored. Such an offset value is derived in advance by a predetermined calibration. Further, a plurality of types of offset values may be stored by replacing one of the plurality of amplification units 234 as a reference. In addition, an absolute value may be stored as an offset value instead of a comparison between the plurality of amplification units 234. That is, it is only necessary to reflect individual differences among the plurality of amplification units 234. In the offset value determination unit 246, the first amplification factor determination unit 244 a reads the offset value corresponding to the digital reception signal 300 input from the second selection unit 242 and outputs the offset value to the final determination unit 248.

  Similarly to the first amplification factor determination unit 244a, the second amplification factor determination unit 244b to the Nth amplification factor determination unit 244n input the reference so that the amplitude of the input digital reception signal 300 approaches the target value. An amplification factor is derived based on the difference between the signal amplitude and the target value.

  The final determination unit 248 determines a plurality of final amplification factors based on the amplification factor input from the first amplification factor determination unit 244a and the offset value input from the offset value determination unit 246 in the normal state. That is, the amplification factor for the reference signal is determined as it is as the amplification factor input from the first amplification factor determination unit 244a. Further, the amplification factor for the digital received signal 300 other than the reference signal is corrected by the one corresponding to the offset value input from the offset value determination unit 246 with respect to the amplification factor input from the first amplification factor determination unit 244a. For example, the offset value is adjusted with respect to the amplification factor. As a result, the amplification factors for the plurality of digital reception signals 300 including the reference signal are determined, and the final determination unit 248 further rearranges the order of the plurality of amplification factors according to the arrangement of the plurality of amplification units 234, The gain signal 340 is output.

  On the other hand, in the case of the weak electric field state, the amplification factors for the plurality of digital reception signals 300 are determined as they are as the plurality of amplification factors input from the first amplification factor determination unit 244a to the Nth amplification factor determination unit 244n. Further, the final determination unit 248 further rearranges the order of the plurality of amplification factors according to the arrangement of the plurality of amplification units 234, and outputs the result as the amplification factor signal 340. As described above, when the derivation unit 232 executes the processing of the weak electric field state, the derivation unit 232 is a signal (not shown) so as to decrease the amplification factor by a predetermined value with respect to the amplification unit 50 included in the wireless unit 12. Direct through the line.

  FIG. 6 shows the configuration of the signal processing unit 14. The signal processing unit 14 includes a reference signal generation unit 72, a reception weight vector calculation unit 70, a synthesis unit 68, a reception response vector calculation unit 200, a transmission weight vector calculation unit 76, and a separation unit 74. Further, the combining unit 68 includes a first multiplying unit 78a, a second multiplying unit 78b, an Nth multiplying unit 78n, and an adding unit 80, which are collectively referred to as a multiplying unit 78, and the separating unit 74 is collectively referred to as a multiplying unit 82. A first multiplier 82a, a second multiplier 82b, and an Nth multiplier 82n are included.

  Also, the signals are collectively referred to as a composite signal 304, a pre-separation signal 306, a first reception weight vector 308a, a second reception weight vector 308b, an Nth reception weight vector 308n, and a transmission weight vector 310. A first transmission weight vector 310a, a second transmission weight vector 310b, an Nth transmission weight vector 310n, a reference signal 312 and a reception response vector 402.

  The reference signal generation unit 72 stores the preamble signal shown in FIG. 2, outputs the stored preamble signal as the reference signal 312 during the training period, and determines the composite signal 304 after the training is completed. The signal is output as a reference signal 312. Note that the end of the training period is notified by a signal processing unit control signal 330 from the control unit 20 (not shown).

ここで、Ｗは受信ウエイトベクトル３０８、μは忘却係数、ｕは、デジタル受信信号３００、ｅは符号間干渉を示した誤差、すなわち合成信号３０４と参照信号３１２との間の誤差を示す。
乗算部７８は、デジタル受信信号３００を受信ウエイトベクトル３０８で重み付けする。加算部８０は、乗算部７８からの出力を加算して、合成信号３０４を出力する。 The reception weight vector calculation unit 70 calculates the reception weight vector 308 necessary for weighting the digital reception signal 300 by an adaptive algorithm such as an RLS (Recursive Last Squares) algorithm or an LMS (Least Mean Squares) algorithm. The calculation of the adaptive algorithm is performed based on the digital received signal 300, the synthesized signal 304, and the reference signal 312. For example, the LMS algorithm is shown as follows:

Here, W is a received weight vector 308, μ is a forgetting factor, u is a digital received signal 300, and e is an error indicating intersymbol interference, that is, an error between the synthesized signal 304 and the reference signal 312.
Multiplier 78 weights digital reception signal 300 with reception weight vector 308. The adder 80 adds the outputs from the multiplier 78 and outputs a combined signal 304.

  The reception response vector calculation unit 200 calculates a reception response vector 402 as the reception response characteristic of the reception signal with respect to the transmission signal. Here, for convenience of explanation, the number of terminal devices 26 is two. Among them, the first terminal device 26 is a communication target, and the second terminal device 26 is not a communication target but corresponds to an interference source. Therefore, it is assumed that a signal related to the second terminal device is input from another signal processing unit 14 (not shown). In addition, when not considering the 2nd terminal device 26 as an interference source, you may delete the term relevant to a 2nd terminal device from the following description. For convenience of explanation, the number of antennas 22 is assumed to be four. An input signal vector X (t) corresponding to the digital received signal 300 is expressed as follows.

ここで、Ｓｒｘｉ（ｔ）は、ｉ番目の端末装置２６が送信した信号を示す。さらに、Ｘ（ｔ）は、前述のごとく入力信号ベクトルであり、デジタル受信信号３００のそれぞれをＲＸｊ（ｔ）とすれば、次のように示される。なお、ｊは図示しないアンテナ２２の番号であり、Ｔは行列の転置を示す。

また、Ｈｉは受信応答ベクトル４０２であり、ｊ番目のアンテナ２２で受信されたｉ番目の端末装置２６からの信号の応答係数をｈｉｊで示せば、Ｈｉは次のように示される。

Here, Srxi (t) indicates a signal transmitted by the i-th terminal device 26. Further, X (t) is an input signal vector as described above, and is expressed as follows if each digital received signal 300 is RXj (t). Here, j is the number of the antenna 22 (not shown), and T indicates transposition of the matrix.

In addition, Hi is a reception response vector 402. If the response coefficient of the signal from the i-th terminal device 26 received by the j-th antenna 22 is represented by hij, Hi is represented as follows.

さらに、Ｎ（ｔ）は雑音ベクトルであり、ｊ番目のアンテナ２２で受信された信号、すなわちｊ番目のデジタル受信信号３００に含まれた雑音をｎｊ（ｔ）で示せば、Ｎ（ｔ）は次のように示される。

ここで、信号処理部１４においてアダプティブアレイが正常に動作していれば、複数の端末装置２６からの信号を分離できるので、前述のＳｒｘｉ（ｔ）はすべて既知の信号になる。なお、この条件に関係なく、トレーニング信号の期間においても、前述のＳｒｘｉ（ｔ）はすべて既知の信号である。これらを利用すれば、受信応答ベクトル４０２は以下の通りに導出できる。

Furthermore, N (t) is a noise vector, and if the noise received in the jth antenna 22, that is, the noise contained in the jth digital received signal 300 is denoted by nj (t), N (t) is It is shown as follows.

Here, if the adaptive array is operating normally in the signal processing unit 14, the signals from the plurality of terminal devices 26 can be separated, so that the above-mentioned Srxi (t) becomes all known signals. Regardless of this condition, all of the aforementioned Srxi (t) are known signals even during the training signal period. Using these, the reception response vector 402 can be derived as follows.

ここで、Ｅはアンサンブル平均を示すが、ここではアンサンブル平均の処理を時間平均の処理におきかえるものとする。時間平均の処理が十分長い期間実行されれば、次のようになる。

これは、Ｓｒｘ１（ｔ）とＳｒｘ２（ｔ）の間に相関がなく、さらにＳｒｘ１（ｔ）とＮ（ｔ）の間に相関がないためである。以上のように受信応答ベクトル４０２に対応したＨ１は、次のように示される。

If an ensemble average is calculated based on the signal Srx1 (t) from the first terminal device 26, it is shown as follows.

Here, E represents an ensemble average. Here, the ensemble average process is replaced with a time average process. If the time-average processing is executed for a sufficiently long period, the following occurs.

This is because there is no correlation between Srx1 (t) and Srx2 (t), and there is no correlation between Srx1 (t) and N (t). As described above, H1 corresponding to the reception response vector 402 is expressed as follows.

  The transmission weight vector calculation unit 76 estimates the transmission weight vector 310 necessary for weighting the pre-separation signal 306 from the reception weight vector 308 and the reception response vector 402 that are reception response characteristics. The estimation method of the transmission weight vector 310 is arbitrary, but the reception weight vector 308 may be used as it is as the simplest method. Alternatively, the reception weight vector 308 or the reception response vector 402 may be corrected by a conventional technique in consideration of the Doppler frequency fluctuation in the propagation environment caused by the time difference between the reception process and the transmission process. Here, for simplification of explanation, the reception response vector 402 is used for estimation of the transmission weight vector 310, but the reception weight vector 308 input by a signal line (not shown) may be used.

ここでも受信応答ベクトル計算部２００の説明と同様にアンテナ２２の数を４とした。なお、ｑは、ｑ番目の端末装置２６を示し、１番目の端末装置２６以外は、１番目の端末装置２６に対して干渉源となるべき端末装置２６に相当する。また、ｉは時刻である。第１の端末装置２６に対する送信ウエイトベクトル３１０は、次のように示される。

ここで、ｑは２以上とする。さらに、拘束条件として、以下の条件ｃ１）、ｃ２）を課す。

The reception response vector 402 corresponding to each of the plurality of terminal devices 26 has already been derived by the reception response vector calculation unit 200. The above estimation is performed on the reception response vector 402, and the predicted value for the reception response vector 402 is shown as follows.

Here, the number of antennas 22 is set to four as in the description of the reception response vector calculation unit 200. Note that q indicates the q-th terminal device 26, and other than the first terminal device 26 corresponds to the terminal device 26 that should be an interference source for the first terminal device 26. I is a time. The transmission weight vector 310 for the first terminal device 26 is shown as follows.

Here, q is 2 or more. Furthermore, the following conditions c1) and c2) are imposed as constraint conditions.

  The estimation of the transmission weight vector 310 is not limited to this, and may be performed by a method using a pseudo correlation value or a method of directing a beam toward a predetermined terminal device 26. In particular, regarding the method of using the pseudo correlation value, for example, the document: T.W. Ohgane, Y .; Ogawa, and K.K. Itoh, Proc. VTC '97, vol. 2, pp. 725-729, May 1997, and the like.

  Multiplier 82 weights pre-separation signal 306 with transmission weight vector 310 and outputs digital transmission signal 302.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a reservation management function loaded in memory. The functional block realized by those cooperation is drawn. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIG. 7 is a flowchart showing the procedure for determining the amplification factor in the deriving unit 232. Although the timing at which the amplification factor determination procedure is executed is arbitrary, it is assumed here that it is performed in the preamble section of FIG. When the RSSI measured by the measurement unit 230 is equal to or greater than the threshold (Y in S10), the first selection unit 240 selects the digital received signal 300 corresponding to the maximum RSSI as a reference value (S12). The first amplification factor determination unit 244a derives an amplification factor corresponding to the reference signal (S14). The offset value determination unit 246 reads an offset value corresponding to the input digital reception signal 300 (S16). The final determination unit 248 determines the amplification factors for the plurality of amplification units 234 based on the derived amplification factor and the read offset value (S18). On the other hand, when the RSSI measured by the measurement unit 230 is not equal to or greater than the threshold (N in S10), the first amplification factor determination unit 244a to the Nth amplification factor determination unit 244n determine the amplification factors for the plurality of amplification units 234. Determine (S20). Further, the deriving unit 232 determines the attenuation value of the transmission power (S22) and instructs the amplification unit 50.

  The operation of the deriving unit 232 having the above configuration will be described. The deriving unit 232 inputs a plurality of digital reception signals 300. Moreover, since the total RSSI is smaller than the threshold value, the second selection unit 242 determines that the electric field state is weak. Therefore, the Nth amplification factor determination unit 244n from the first amplification factor determination unit 244a independently derives the amplification factor, and the final determination unit 248 outputs the amplification factor as the amplification factor signal 340. Further, the deriving unit 232 instructs the amplification unit 50 to attenuate the amplification factor.

  According to the embodiment of the present invention, in the case of a weak electric field, the amplification factors for a plurality of AGCs are derived on the basis of individual control, so that the amplification factors for a plurality of AGCs are derived in association with each other. A large amplification factor can be obtained. In addition, since the amplification factors for a plurality of AGCs are derived while being associated with each other when the electric field is not weak, the accuracy of adaptive array processing can be improved. Further, the characteristics of the upstream signal can be improved in a system in which the upstream signal is worse than the downstream signal, such as a simple mobile phone system. Moreover, the coverage area by one base station apparatus is expanded by the improvement of the characteristic of an upstream signal. In addition, the communication quality in the area fringe is improved. Also, even if the amplification factors for a plurality of AGCs are derived based on individual control, the power at the time of signal transmission is attenuated, so that interference caused to other terminal devices due to imperfection of directivity control The impact can be reduced.

(Example 2)
As in the first embodiment, the second embodiment of the present invention relates to the setting of the AGC gain in the base station apparatus that performs adaptive array processing. The base station apparatus according to the second embodiment derives a plurality of amplification factors as in the first embodiment in the normal state. On the other hand, in the case of a weak electric field state, a minimum value is selected from a plurality of RSSIs (hereinafter, the selected minimum value is also referred to as “reference value”), and an amplification factor is derived for a reference signal corresponding to the reference value. . Further, as described above, the offset value is stored in advance, and the amplification factor is determined from the derived amplification factor and the stored offset value for a plurality of signals other than the reference signal. Based on the amplification factors determined in this way, the plurality of AGCs amplify the received signals, respectively.

  In the base station apparatus according to the present embodiment, the amplification factor is determined by the same method as in the normal state in the weak electric field state, but the reference signal is set to a signal corresponding to the minimum value of RSSI. In the normal state, the reference signal is set to a signal corresponding to the maximum value of RSSI so that the signal having the maximum amplitude is adjusted so as not to be distorted even when amplified. However, by setting the reference signal to a signal corresponding to the minimum value of RSSI, the signal having the maximum amplitude is set so that it can be amplified with a high amplification factor even if distortion occurs due to amplification. With such a configuration, the same processing can be executed in the normal state and the weak electric field state, and the circuit can be shared.

The configuration of the base station apparatus 10 according to the second embodiment is the same type as the base station apparatus 10 illustrated in FIG. Therefore, explanation is omitted.
FIG. 8 illustrates a configuration of the derivation unit 232 according to the second embodiment. The derivation unit 232 in FIG. 8 corresponds to a configuration in which the second selection unit 242 is removed from the derivation unit 232 in FIG. 5 and the Nth amplification factor determination unit 244n is excluded from the second amplification factor determination unit 244b. Note that the amplification factor determination unit 244 in FIG. 8 corresponds to the first amplification factor determination unit 244a in FIG.

  The first selection unit 240 receives the measurement result signal 342 and calculates the total RSSI from a plurality of RSSIs. Further, a threshold value is stored in advance, and a normal state or a weak electric field state is determined based on a comparison between the total RSSI and the threshold value. The first selection unit 240 selects a maximum value as a reference value from a plurality of RSSIs when it is determined as a normal state. Further, a digital reception signal 300 is also input, and one digital reception signal 300 corresponding to the selected reference value is selected as a reference signal. On the other hand, the first selection unit 240 selects a minimum value as a reference value from a plurality of RSSIs when it is determined that the state is a weak electric field state. Further, a digital reception signal 300 is also input, and one digital reception signal 300 corresponding to the selected reference value is selected as a reference signal. The subsequent processing is the same as the normal state in the first embodiment, and the first selection unit 240 outputs the selected reference signal to the amplification factor determination unit 244, and determines the digital received signal 300 other than the reference signal as an offset value. To the unit 246.

  FIG. 9 is a flowchart showing the procedure for determining the amplification factor in the deriving unit 232. Although the timing at which the amplification factor determination procedure is executed is arbitrary, it is assumed here that it is performed in the preamble section of FIG. When the RSSI measured by the measurement unit 230 is equal to or greater than the threshold (Y in S30), the first selection unit 240 selects the digital received signal 300 corresponding to the maximum RSSI as a reference value (S32). The amplification factor determination unit 244 derives the amplification factor corresponding to the reference signal (S34). The offset value determination unit 246 reads an offset value corresponding to the input digital reception signal 300 (S36). The final determination unit 248 determines the amplification factors for the plurality of amplification units 234 based on the derived amplification factor and the read offset value (S38).

  On the other hand, when the RSSI measured by the measurement unit 230 is not equal to or greater than the threshold (N in S30), the first selection unit 240 selects the digital received signal 300 corresponding to the minimum RSSI as a reference value (S40). . The amplification factor determination unit 244 derives the amplification factor corresponding to the reference signal (S42). The offset value determination unit 246 reads an offset value corresponding to the input digital reception signal 300 (S44). The final determination unit 248 determines amplification factors for the plurality of amplification units 234 based on the derived amplification factor and the read offset value (S46). Further, the deriving unit 232 determines the attenuation value of the transmission power (S48) and instructs the amplification unit 50.

  The operation of the deriving unit 232 having the above configuration will be described. The deriving unit 232 inputs a plurality of digital reception signals 300. Moreover, the 1st selection part 240 inputs RSSI, and since total RSSI is smaller than a threshold value, it determines with it being a weak electric field state. The first selection unit 240 selects the digital received signal 300 corresponding to the minimum RSSI as the reference signal, and outputs it to the amplification factor determination unit 244. In addition, the first selection unit 240 outputs the remaining digital reception signal 300 to the offset value determination unit 246. The amplification factor determination unit 244 derives the amplification factor based on the reference signal, and the offset value determination unit 246 reads the offset value. The final determination unit 248 determines a plurality of amplification factors based on the derived amplification factors and the read offset values. The final determination unit 248 outputs a plurality of amplification factors as the amplification factor signal 340. Further, the deriving unit 232 instructs the amplification unit 50 to attenuate the amplification factor.

  According to the embodiment of the present invention, in the case of a weak electric field, the signal corresponding to the minimum received power is set as the reference signal while deriving the amplification factors for a plurality of AGCs in association with each other. Therefore, a larger amplification factor can be obtained than when the signal corresponding to the maximum received power is set as the reference signal. Further, since the amplification factors for a plurality of AGCs are derived while being related to each other regardless of the normal state or the weak electric field state, the present invention can be applied even when the amplification factors for a plurality of AGCs cannot be derived independently. Further, since only the reference signal selection criterion changes according to the normal state or the weak electric field state, many processes can be shared. In addition, the operation pattern is reduced, and a confirmation test or the like is facilitated.

(Example 3)
As in the first embodiment, the third embodiment of the present invention relates to the setting of the AGC gain in the base station apparatus that performs adaptive array processing. In the normal state, the base station apparatus according to the third embodiment derives a plurality of amplification factors as in the first embodiment. On the other hand, in the case of a weak electric field state, a predetermined value is added to the amplification factor derived with respect to the reference signal. Further, a plurality of gains are determined from the gain obtained by adding a predetermined value and the stored offset value. Based on the amplification factors determined in this way, the plurality of AGCs amplify the received signals, respectively. In the base station apparatus according to the present embodiment, since a predetermined value is added to the amplification factor corresponding to the reference signal in the case of a weak electric field state, the amplification factor can be increased. Can be big.

The configuration of the base station apparatus 10 according to the third embodiment is the same type as the base station apparatus 10 illustrated in FIG. Therefore, explanation is omitted.
FIG. 10 illustrates a configuration of the deriving unit 232 according to the third embodiment. The derivation unit 232 in FIG. 10 adds an addition value determination unit 250 to the derivation unit 232 in FIG.
The first selection unit 240 receives the measurement result signal 342 and selects a maximum value from a plurality of RSSIs as a reference value. Further, a digital reception signal 300 is also input, and one digital reception signal 300 corresponding to the selected reference value is selected as a reference signal. The first selection unit 240 outputs the selected reference signal to the amplification factor determination unit 244 and outputs the digital received signal 300 other than the reference signal to the offset value determination unit 246.

  The addition value determination unit 250 receives the measurement result signal 342 and calculates the total RSSI from a plurality of RSSIs. Further, a threshold value is stored in advance, and a normal state or a weak electric field state is determined based on a comparison between the total RSSI and the threshold value. The addition value determination unit 250 outputs nothing when it is determined as the normal state, but outputs an addition value stored in advance when it is determined as the weak electric field state.

  The amplification factor determination unit 244 derives the amplification factor based on the difference between the input reference signal amplitude and the target value so that the input reference signal amplitude approaches the target value. Furthermore, in the case of a weak electric field state, the addition value input from the addition value determination unit 250 is added to the derived amplification factor.

  FIG. 11 is a flowchart showing the procedure for determining the amplification factor in the deriving unit 232. Although the timing at which the amplification factor determination procedure is executed is arbitrary, it is assumed here that it is performed in the preamble section of FIG. When the RSSI measured by the measurement unit 230 is equal to or greater than the threshold (Y in S60), the first selection unit 240 selects the digital received signal 300 corresponding to the maximum RSSI as a reference value (S62). The amplification factor determination unit 244 derives an amplification factor corresponding to the reference signal (S64). The offset value determination unit 246 reads an offset value corresponding to the input digital reception signal 300 (S66). The final determination unit 248 determines amplification factors for the plurality of amplification units 234 based on the derived amplification factor and the read offset value (S68).

  On the other hand, when the RSSI measured by the measurement unit 230 is not equal to or greater than the threshold (N in S60), the first selection unit 240 selects the digital received signal 300 corresponding to the maximum RSSI as a reference value (S70). . The amplification factor determination unit 244 derives an amplification factor corresponding to the reference signal (S72). The offset value determination unit 246 reads an offset value corresponding to the input digital reception signal 300 (S74). The addition value determination unit 250 outputs the addition value, and the amplification factor determination unit 244 adds the addition value to the derived amplification factor (S76). The final determination unit 248 determines amplification factors for the plurality of amplification units 234 based on the added amplification factor and the read offset value (S78). Further, the deriving unit 232 determines the attenuation value of the transmission power (S80) and instructs the amplification unit 50.

  The operation of the deriving unit 232 having the above configuration will be described. The deriving unit 232 inputs a plurality of digital reception signals 300. The first selection unit 240 selects the digital received signal 300 corresponding to the minimum RSSI as the reference signal, and outputs it to the amplification factor determination unit 244. In addition, the first selection unit 240 outputs the remaining digital reception signal 300 to the offset value determination unit 246. The amplification factor determination unit 244 derives the amplification factor based on the reference signal, and the offset value determination unit 246 reads the offset value. Since the total RSSI is smaller than the threshold value, the addition value determination unit 250 determines that the electric field state is weak. The addition value determination unit 250 outputs the stored addition value to the amplification factor determination unit 244, and the amplification factor determination unit 244 adds the addition value to the derived amplification factor. The final determination unit 248 determines a plurality of amplification factors based on the added amplification factor and the read offset value. The final determination unit 248 outputs a plurality of amplification factors as the amplification factor signal 340. Further, the deriving unit 232 instructs the amplification unit 50 to attenuate the amplification factor.

  According to the embodiment of the present invention, in the case of a weak electric field, a predetermined value is added to the amplification factor corresponding to the reference signal while deriving the amplification factors for a plurality of AGCs in association with each other. A larger amplification factor can be obtained than when not. Further, since the amplification factors for a plurality of AGCs are derived while being related to each other regardless of the normal state or the weak electric field state, the present invention can be applied even when the amplification factors for a plurality of AGCs cannot be derived independently. Further, since only a predetermined value is added according to the normal state or the weak electric field state, many processes can be shared. In addition, the operation pattern is reduced, and a confirmation test or the like is facilitated.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

  In the first to third embodiments of the present invention, the communication system 100 is a simple mobile phone system. However, the present invention is not limited to this. For example, a mobile phone system, a third generation mobile phone system, a wireless LAN system, or an FWA (Fixed Wireless Access) system may be used. According to this modification, the present invention can be applied to various communication systems 100. That is, the base station apparatus 10 may perform adaptive array processing.

  Any combination of Embodiments 1 to 3 of the present invention is also effective. According to this modification, the effect obtained by combining the first to third embodiments can be obtained.

1 is a diagram illustrating a configuration of a communication system according to a first embodiment. It is a figure which shows the burst format which concerns on Example 1. FIG. It is a figure which shows the structure of the 1st radio | wireless part of FIG. It is a figure which shows the structure of the measurement part and derivation | leading-out part of FIG. It is a figure which shows the structure of the derivation | leading-out part of FIG. It is a figure which shows the structure of the signal processing part of FIG. It is a flowchart which shows the determination procedure of the gain in the derivation | leading-out part of FIG. FIG. 10 is a diagram illustrating a configuration of a derivation unit according to Embodiment 2. It is a flowchart which shows the determination procedure of the gain in the derivation | leading-out part of FIG. FIG. 10 is a diagram illustrating a configuration of a derivation unit according to a third embodiment. It is a flowchart which shows the determination procedure of the gain in the derivation | leading-out part of FIG.

Explanation of symbols

  10 base station device, 12 radio unit, 14 signal processing unit, 16 modem unit, 18 baseband unit, 20 control unit, 22 antenna, 24 network, 26 terminal device, 34 antenna, 36 switch unit, 38 receiving unit, 40 transmission Unit, 42 frequency conversion unit, 44 orthogonal detection unit, 46 AGC, 48 AD conversion unit, 50 amplification unit, 52 frequency conversion unit, 54 orthogonal modulation unit, 56 DA conversion unit, 68 synthesis unit, 70 reception weight vector calculation unit, 72 reference signal generation unit, 74 separation unit, 76 transmission weight vector calculation unit, 78 multiplication unit, 80 addition unit, 82 multiplication unit, 100 communication system, 200 reception response vector calculation unit, 230 measurement unit, 232 derivation unit, 234 amplification Part 236 setting part 240 1 selection unit, 242 second selection unit, 244 amplification factor determination unit, 246 offset value determination unit, 248 final determination unit, 250 addition value determination unit.

Claims (10)

A receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas;
A measuring unit for measuring the intensity of each of the plurality of signals received by the receiving unit;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals A derivation unit for deriving a relative strength relationship between the rest of the signal and the reference signal;
An amplifying unit for amplifying a reference signal among the plurality of received signals with an amplification factor derived, and amplifying the remainder based on the relative relationship between the derived amplification factor and the derived intensity;
A processing unit that performs adaptive array processing on the plurality of amplified signals,
The deriving unit derives a plurality of amplification factors for the plurality of received signals, respectively, when the intensity of the plurality of signals measured by the measuring unit is smaller than a predetermined threshold value,
The amplifying unit amplifies each of the received plurality of signals with a plurality of amplification factors derived. A receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas;
A measuring unit for measuring the intensity of each of the plurality of signals received by the receiving unit;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals A derivation unit for deriving a relative strength relationship between the rest of the signal and the reference signal;
An amplifying unit for amplifying a reference signal among the plurality of received signals with an amplification factor derived, and amplifying the remainder based on the relative relationship between the derived amplification factor and the derived intensity;
A processing unit that performs adaptive array processing on the plurality of amplified signals,
If the intensity of the plurality of signals measured by the measurement unit is equal to or greater than a predetermined threshold value, the deriving unit outputs a signal corresponding to the larger intensity of the measured plurality of signals as the reference. If the intensity of a plurality of signals selected as a signal and measured by the measurement unit is smaller than a predetermined threshold value, a signal corresponding to the smaller intensity among the intensity of the plurality of signals measured is the reference signal A communication device characterized by being selected as: A receiving unit that receives a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas;
A measuring unit for measuring the intensity of each of the plurality of signals received by the receiving unit;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals A derivation unit for deriving a relative strength relationship between the rest of the signal and the reference signal;
An amplifying unit for amplifying a reference signal among the plurality of received signals with an amplification factor derived, and amplifying the remainder based on the relative relationship between the derived amplification factor and the derived intensity;
A processing unit that performs adaptive array processing on the plurality of amplified signals,
The derivation unit adds a predetermined value to the derived amplification factor when the intensity of the plurality of signals measured by the measurement unit is smaller than a predetermined threshold value. A determination unit for deriving a transmission channel characteristic based on a reception channel characteristic derived by adaptive array processing in the processing unit;
A transmission unit that performs weighting on a signal to be transmitted based on the transmission channel characteristics for transmission, and transmits from the plurality of antennas;
The transmitting unit reduces the strength of signals to be transmitted from the plurality of antennas by a predetermined value when the strengths of the plurality of signals measured by the measuring unit become smaller than a predetermined threshold value. Item 4. The communication device according to any one of Items 1 to 3. Receiving a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and measuring the strength of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative strength relationship between the rest of the signal and the reference signal;
Amplifying a reference signal among the plurality of received signals with a derived gain, and amplifying the rest based on the relative relationship between the derived gain and the derived intensity;
The deriving step derives a plurality of amplification factors for the received plurality of signals, respectively, if the measured intensities of the plurality of signals are smaller than a predetermined threshold;
The amplifying method is characterized in that the amplifying step amplifies each of the received plurality of signals with a plurality of amplification factors derived. Receiving a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and measuring the strength of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative strength relationship between the rest of the signal and the reference signal;
Amplifying a reference signal among the plurality of received signals with a derived gain, and amplifying the rest based on the relative relationship between the derived gain and the derived intensity;
In the deriving step, if the intensity of the plurality of measured signals is equal to or greater than a predetermined threshold value, a signal corresponding to a larger intensity among the intensity of the plurality of measured signals is used as the reference signal. If the intensity of the plurality of measured signals is smaller than a predetermined threshold, a signal corresponding to the smaller intensity of the plurality of measured signals is selected as the reference signal. A characteristic amplification method. Receiving a total number of signals equal to the number of the plurality of antennas via each of the plurality of antennas, and measuring the strength of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative strength relationship between the rest of the signal and the reference signal;
Amplifying a reference signal among the plurality of received signals with a derived gain, and amplifying the rest based on the relative relationship between the derived gain and the derived intensity;
The deriving step includes adding a predetermined value to the derived amplification factor when the measured intensities of the plurality of signals become smaller than a predetermined threshold value. Receiving a number of signals from the wireless network via each of the plurality of antennas in total equal to the number of the plurality of antennas, and measuring the strengths of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative intensity relationship between the rest of the reference signal and the reference signal, and storing each of the derived amplification factor and the derived intensity correlation in a memory;
Amplifying a reference signal among the plurality of received signals with a stored amplification factor and amplifying the remainder based on a relative relationship between the stored amplification factor and the stored intensity; and With
In the storing step, when the measured intensities of the plurality of signals become smaller than a predetermined threshold, a plurality of amplification factors for the plurality of received signals are derived, respectively, and the derived plurality of amplification factors are stored in the memory. Remember each,
The controlling step is a program for causing a computer to control the amplifier so as to amplify the received signals at a plurality of stored amplification factors. Receiving a number of signals from the wireless network via each of the plurality of antennas in total equal to the number of the plurality of antennas, and measuring the strengths of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative intensity relationship between the rest of the reference signal and the reference signal, and storing each of the derived amplification factor and the derived intensity correlation in a memory;
Amplifying a reference signal among the plurality of received signals with a stored amplification factor and amplifying the remainder based on a relative relationship between the stored amplification factor and the stored intensity; and With
In the storing step, if the intensity of the plurality of measured signals is equal to or greater than a predetermined threshold value, a signal corresponding to a larger intensity among the intensity of the plurality of measured signals is used as the reference signal. If the intensity of the plurality of measured signals is smaller than a predetermined threshold, a signal corresponding to the smaller intensity of the plurality of measured signals is selected as the reference signal. A program that causes a computer to execute. Receiving a number of signals from the wireless network via each of the plurality of antennas in total equal to the number of the plurality of antennas, and measuring the strengths of the received signals, respectively;
Based on the measured intensity of the plurality of signals, selecting one of the plurality of received signals to be a reference signal and deriving an amplification factor for the reference signal, the plurality of received signals Deriving a relative intensity relationship between the rest of the reference signal and the reference signal, and storing each of the derived amplification factor and the derived intensity correlation in a memory;
Amplifying a reference signal among the plurality of received signals with a stored amplification factor and amplifying the remainder based on a relative relationship between the stored amplification factor and the stored intensity; and With
In the storing step, when the measured intensities of the plurality of signals become smaller than a predetermined threshold, the computer is caused to add a predetermined value stored in the memory in advance to the derived amplification factor. Program for.

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