JP3875347B2 - Radio receiver and radio transceiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio receiver in which frequency conversion and modulation / demodulation are performed based on a local oscillation signal whose transmission frequency coincides with high accuracy with a radio frequency of an incoming reception wave, as in a mobile communication system to which a CDMA system is applied, and The present invention relates to a wireless transceiver.
[0002]
[Prior art]
The CDMA (Code Division Multiple Access) system is superior to other multiple access systems in that it provides high transmission quality against interference, interference, and fluctuations in the transmission characteristics of the wireless transmission path, and is rich in secrecy. Various developments and researches are in progress in the direction of application to mobile communication systems.
[0003]
FIG. 15 is a diagram illustrating a configuration example of a conventional radio receiver adapted to the CDMA system.
In the figure, a received wave is applied to one input of a multiplier 161 via a low noise amplifier 101 and a band pass filter (BPF) 102, and an output of the multiplier 161 is demodulated via a band pass filter (BPF) 162. Connected to the input of the device 163. The output of the local oscillator 164 is connected to the carrier wave input of the demodulator 163, and two outputs of the demodulator 163 (corresponding to the I channel and Q channel orthogonal to each other) are input to the corresponding inputs of the phase detector 165. Connected. The output of the phase detector 165 is connected to the input of the control unit 167 via the frequency error detector 166, and an initial value (not shown) to be described later is given to the control unit 167 from the outside. The output of the control unit 167 is a D / A converter 169 connected in series, a voltage controlled temperature compensation crystal oscillator (VCTCXO) (hereinafter simply referred to as “VCTCXO”) 170, and a local oscillator 171 through a local oscillator 171. Connected to the other input.
[0004]
The local oscillation unit 171 includes a frequency divider 172 connected in series to the output of the VCTCXO 170, and one input connected to the output of the frequency divider 172, and a phase comparator 173. A low-pass filter (LPF) 174 that is cascade-connected between the output of 173 and the other input to form an indirect synthesis type oscillator using a PLL (Phase Locked Loop), a voltage controlled oscillator 175, and a frequency divider 176 Is done.
[0005]
In the wireless receiver having such a configuration, the multiplier 161 and the band pass filter 162 are subjected to QPSK modulation in accordance with transmission information at the transmission end and the received wave (here, the transmission signal) provided by the local oscillation unit 171. In addition, the received wave is converted into an intermediate frequency signal by taking the product of The local oscillator 164 generates a carrier signal having a frequency substantially matching the frequency of the received wave in the baseband region, and the demodulator 163 demodulates the intermediate frequency signal using the carrier signal as a reference (applies to the QPSK modulation method). ) To output I channel and Q channel baseband signals orthogonal to each other in parallel.
[0006]
The phase detector 165 converts these baseband signals into digital signals via a built-in A / D converter (not shown), and a time series t (here, for the sake of simplicity, normalization is performed in the symbol period). And the amplitudes Imt and Qmt of the I channel and Q channel corresponding to
θt = tan-1 (Qmt / Imt)
The phase θt of the received wave expressed by the equation is sequentially calculated. The frequency error detector 166 calculates the frequency deviation of the received wave by differentiating the phase θt twice with respect to the time series t described above.
[0007]
Note that the calculation of such a frequency deviation is used for information that is known to be received based on the format of the received wave among the received wave components described above (for example, for establishing synchronization at the receiving end). (A preamble, a unique word, and a sequence of consecutive symbols (bits) having the same value).
The control unit 167 determines whether or not the frequency deviation calculated as described above is equal to “0” with a predetermined accuracy. If the determination result is false, the control unit 167 is proportional to the frequency deviation. A digital signal indicating the value is output. The D / A converter 169 generates a control signal indicating the value indicated by the digital signal as the control voltage Vcont, and the VCTCXO 170 changes the oscillation frequency in the direction in which the frequency deviation is compressed according to the control signal.
[0008]
The frequency divider 172 and the local oscillation unit 171 have an oscillation frequency fVCTCXO, a frequency division ratio (1 / M) of the frequency divider 172, and a frequency division ratio (1 / N) of the frequency divider 176.
fMS = fVCTCXO · (N / M)
The frequency of the local oscillation signal described above is updated to the frequency fMS represented by the following equation.
The control unit 167 includes a multiplier 161, a band pass filter 162, a demodulator 163, a local oscillator 164, a phase detector 165, a frequency error detector 166, a D / A converter 169, a VCTCXO 170, a frequency divider 172, and a local oscillation unit. The process of updating the frequency of the local oscillation signal as described above is repeated under the linkage with 171, but when the result of the above-described determination is recognized, the digital signal output is stopped at that time. And wait.
[0009]
That is, in the conventional example, the oscillation frequency of the VCTCXO 170 is automatically set to a value at which the local oscillation signal generated by the local oscillation unit 171 matches the frequency of the received wave with a desired accuracy upon starting. The
Therefore, at the receiving end to which such a conventional example is applied, frequency synchronization with respect to the opposing transmitting end (for example, a radio base station of a mobile communication system) is taken with high accuracy of about ± 1 ppm, and a desired communication quality is achieved. Secured.
[0010]
[Problems to be solved by the invention]
However, in the above-described conventional example, the VCTCXO 170 has a stable oscillation frequency as compared with a crystal oscillator that is not subjected to any temperature compensation. For example, an operating temperature of −30 ° C. to + 85 ° C. is ± 5% of a standard value. The oscillation frequency fluctuates over ± 1.0 ppm, ± 0.2 ppm, ± 0.2 ppm, and ± 0.5 to 1 per year for fluctuations in power supply voltage and ± 10% load, respectively. Aging over the order of 0.0 ppm occurs.
[0011]
Therefore, in the conventional example, it is difficult to stabilize the oscillation frequency with high accuracy of about ± 1 ppm as described above against the fluctuations and aging of the operating temperature, power supply voltage and load.
In the case of a mobile terminal of a CDMA mobile communication system to which the conventional example is applied, the oscillation frequency of the VCTCXO 170 is determined with a predetermined accuracy under the control performed by the control unit 167 from the time when the power is turned on. The time required until this time (hereinafter referred to as “required pull-in time”) is the above-described operating temperature because the above-described preamble, unique word, and continuous series of symbols (bits) having the same value are not continuously received. Depending on the degree of fluctuations in power supply voltage and load and aging, it takes several tens of seconds, which may hinder urgent outgoing calls and waiting for incoming calls.
[0012]
Further, as shown in FIG. 16, when the D / A converter 169 is formed of a current output type circuit, the deviation of the resistance value of the output resistance RL of the D / A converter 169 is generally ± 5%. Therefore, there is a possibility that the oscillation frequency of the VCTCXO 170 fluctuates due to an error occurring in the control voltage Vcont and that the pull-in time varies greatly.
[0013]
For VCTCXO170, if a semi-fixed variable capacitor (trimmer capacitor) is added to enable manual adjustment of the transmission frequency, the capacitance can be adjusted during shipment and maintenance. is there.
However, such a configuration in which a variable capacitor is added cannot be applied in practice because the capacitance of the variable capacitor changes according to aging or vibration, and the adjustment described above requires man-hours. There were many.
[0014]
An object of the present invention is to provide a radio receiver capable of quickly compressing a difference between a frequency of a received wave and a frequency to be received with high accuracy upon starting.
[0015]
[Means for Solving the Problems]
FIG. 1 is a block diagram showing the principle of first to third radio receivers according to the present invention.
A first radio receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for fluctuations in oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A local oscillation means 12 for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means 11; and a received wave having a plurality of signal points having different phases in the signal space; and The frequency conversion means 13 for generating an intermediate frequency signal by frequency-converting the received wave with reference to the local oscillation signal given by the local oscillation means 12, and the intermediate frequency signal generated by the frequency conversion means 13 are demodulated, The demodulator 14 obtains a sequence of signal points that the received wave takes in the signal space, and the phase sequence of the signal points obtained by the demodulator 14 is differentiated twice. Deviation detecting means 15 for obtaining the deviation of the frequency of the received signal, and control means 16 for giving the reference generating means 11 a value for changing the frequency of the reference signal in the direction in which the deviation obtained by the deviation detecting means 15 is compressed. In the wireless receiver provided, the storage means 17 used for holding the initial value of the value and the pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave are replaced with the received wave. And an initial setting means 18 for storing in the storage means 17 as an initial value a value that is regularly given to the reference generation means 11 by the control means 16 with a desired accuracy. The control means 16 has a means for reading out the initial value stored in the storage means 17 at the time of start-up and giving it to the reference generation means 11. 11 is monitored, and the monitoring means 41 for determining the integrated value of the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold value or the maximum length of the period, and starting at the start The time counting means 42 for measuring time over a predetermined interval, and the time when the time measuring means 42 has completed time measurement over the interval, the integrated value obtained by the monitoring means 41 or the maximum length is predetermined. An alarm means 43 that compares the upper limit value and issues an alarm indicating that the former exceeds the latter is provided.
[0016]
In the wireless receiver configured as described above, the reference generation means 11 generates a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and shifted over a value given from the outside. The local oscillating means 12 generates a local oscillation signal by performing frequency synthesis based on the frequency of the reference signal.
In addition, when a pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than a received wave having a plurality of signal points having different phases in the signal space is given to the frequency converting means 13, the frequency converting means 13. Generates an intermediate frequency signal by frequency-converting the pseudo received wave with reference to the above-mentioned local oscillation signal. Further, the demodulating means 14 demodulates the intermediate frequency signal to obtain a sequence of signal points taken by the pseudo received wave in the signal space, and the deviation detecting means 15 differentiates the phase sequence of these signal points twice. Thus, the frequency deviation of the pseudo received wave is obtained. The control means 16 gives the reference generating means 11 a value that changes the frequency of the reference signal in the direction in which the deviation is compressed, and the initial setting means 18 in this way makes the reference generating means 11 steady with a desired accuracy. The given value is stored in the storage means 17 as an initial value.
[0017]
Further, since the control means 16 reads out the initial value at the time of start-up and gives it to the reference generation means 11, the local oscillation means 12 uses the reference signal whose frequency is set according to the initial value as a reference, A local oscillation signal having the same frequency as the local oscillation signal described above is generated.
Therefore, the received wave given to the frequency converting means 13 is quickly converted with the frequency conversion means 13 and the demodulating means 14 by performing frequency conversion and demodulation performed on the above-described pseudo received wave, respectively. In addition, it is accurately converted into a sequence of signal points as described above.
[0018]
In the frequency control process described above, the monitoring unit 41 monitors the value given to the reference generation unit 11 by the control unit 16, and the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold value. Find the integrated value or the maximum length of that period. The time counting means 42 is activated at the time of starting and measures time over a predetermined interval, and the alarm means 43 is the integrated value or maximum value obtained by the monitoring means 41 when the time measuring means 42 completes the time measurement. Is compared with a predetermined upper limit value, and when the former exceeds the latter, an alarm indicating the fact is issued.
[0019]
Such an alarm means that “the accuracy of the frequency of the reference signal generated by the reference generation means has decreased according to the initial value held in the storage means”, and thus the initial value needs to be reset. This is reliably transmitted to the operator and the like, and quick maintenance adapted to changes over time, operating temperature, power supply voltage and other environmental conditions becomes possible.
A second radio receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A local oscillation means 12 for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means 11; and a received wave having a plurality of signal points having different phases in the signal space; and The frequency conversion means 13 for generating an intermediate frequency signal by frequency-converting the received wave with reference to the local oscillation signal given by the local oscillation means 12, and the intermediate frequency signal generated by the frequency conversion means 13 are demodulated, The demodulator 14 obtains a sequence of signal points that the received wave takes in the signal space, and the phase sequence of the signal points obtained by the demodulator 14 is differentiated twice. Deviation detecting means 15 for obtaining the deviation of the frequency of the received signal, and control means 16 for giving the reference generating means 11 a value for changing the frequency of the reference signal in the direction in which the deviation obtained by the deviation detecting means 15 is compressed. In the wireless receiver provided, the storage means 17 used for holding the initial value of the value and the pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave are replaced with the received wave. And an initial setting means 18 for storing in the storage means 17 as an initial value a value that is regularly given to the reference generation means 11 by the control means 16 with a desired accuracy. The control means 16 has a means for reading out the initial value stored in the storage means 17 at the time of start-up and giving it to the reference generation means 11. 11 when the deviation of the value given to 11 from the initial value falls below a predetermined threshold, the averaging means 61 for holding the average value of the values, and the average value and the initial value held by the averaging means 61 When the initial value is given to the reference generation means, and the difference is large to the extent that the time for the frequency of the reference signal to converge with a desired accuracy exceeds the allowable maximum value, the storage means 17 And an initial value updating means 62 for replacing the initial value held in the mean value with an average value.
[0020]
In the second radio receiver configured as described above, the averaging unit 61 receives the value given to the reference generation unit 11 by the control unit 16 in the process of frequency control similar to that of the first radio receiver described above. When the deviation from the initial value is below a predetermined threshold, the average value is held. The initial value updating means 62 takes the difference between the average value and the above-described initial value, and allows a time for the frequency of the reference signal to converge with a desired accuracy from the time when the initial value is given to the reference generating means. When the difference is large enough to exceed the maximum value, the initial value held in the storage means 17 is replaced with the average value.
[0021]
In other words, the initial value that should be applied at the time of starting is dynamically updated by adapting flexibly to changes over time, operating temperature, and power supply voltage. The frequency of the reference signal is set.
A third radio receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A local oscillation means 12 for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means 11; and a received wave having a plurality of signal points having different phases in the signal space; and The frequency conversion means 13 for generating an intermediate frequency signal by frequency-converting the received wave with reference to the local oscillation signal given by the local oscillation means 12, and the intermediate frequency signal generated by the frequency conversion means 13 are demodulated, The demodulator 14 obtains a sequence of signal points that the received wave takes in the signal space, and the phase sequence of the signal points obtained by the demodulator 14 is differentiated twice. Deviation detecting means 15 for obtaining the deviation of the frequency of the received signal, and control means 16 for giving the reference generating means 11 a value for changing the frequency of the reference signal in the direction in which the deviation obtained by the deviation detecting means 15 is compressed. In the wireless receiver provided, the storage means 17 used for holding the initial value of the value and the pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave are replaced with the received wave. And an initial setting means 18 for storing in the storage means 17 as an initial value a value that is regularly given to the reference generation means 11 by the control means 16 with a desired accuracy. The control means 16 has a means for reading out the initial value stored in the storage means 17 at the time of start-up and giving it to the reference generation means 11. 11 when the deviation of the value given to 11 from the initial value falls below a predetermined threshold value, the averaging means 61 that holds the average value, and is started with the start-up and measures the time over a predetermined interval. When the time measuring means 71 to perform and the time measuring means 71 complete the time measurement over the interval, the difference between the average value held by the averaging means 61 and the initial value is taken, and this initial value is given to the reference generating means 11. When the difference is so large that the time required for the frequency of the reference signal to converge with a desired accuracy from the point in time exceeds the allowable maximum value, the initial value held in the storage means 17 is replaced with the average value. The initial value updating means 72 is provided.
[0022]
In the third radio receiver configured in this way, the averaging means 61 is the value given to the reference generating means 11 by the control means 16 in the process of frequency control similar to that of the first radio receiver described above. When the deviation from the initial value is below a predetermined threshold, the average value is held.
Moreover, the time measuring means 71 is started at the time of starting and measures time over a predetermined interval. The initial value updating means 72 takes the difference between the average previously held by the averaging means 61 and the initial value when the time measuring means 71 completes the time measurement, and gives this initial value to the reference generating means 11. If the difference is so large that the time required for the frequency of the reference signal to converge with a desired accuracy from the time point exceeds the maximum allowable value, the initial value held in the storage means is averaged. Replace.
[0023]
In other words, the initial value to be applied at the time of start-up is dynamically updated to an appropriate value at a cycle adapted to the rate of aging. The state that “the frequency of the signal is set” is maintained.
FIG. 2 is a principle block diagram of fourth to sixth radio receivers according to the present invention.
[0024]
A fourth wireless receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for fluctuations in oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A reference wave generating unit 20 that generates a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating unit 11, and a received wave that has a plurality of signal points with different phases in the signal space. By demodulating the reference carrier signal given by the generating means 20 as a reference, the received signal obtains a sequence of signal points in the signal space, and a phase sequence of signal points obtained by the demodulation means 21. Deviation detecting means 22 for obtaining the deviation of the frequency of the received wave by differentiating twice, and the reference signal in the direction in which the deviation obtained by the deviation detecting means 22 is compressed In a radio receiver comprising a control means 23 for giving a value whose frequency changes to the reference generation means 11, a storage means 24 for holding an initial value of the value, and a frequency deviation and stability with respect to the received wave Is a value that is steadily given to the reference generation means 11 by the control means 23 to the reference generation means 11 when a pseudo reception wave that can be regarded as equivalent or higher is given to the demodulation means 21 instead of the reception wave. And an initial setting means 25 for storing the initial value stored in the storage means 24 as an initial value, and the control means 23 has means for reading the initial value stored in the storage means 24 at the time of start-up and giving it to the reference generating means 11. Further, the value given to the reference generation means 11 by the control means 16 is monitored, and the integrated value of the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold or the maximum value of the period. The monitoring means 41 for obtaining the length of the time, the time measuring means 42 that is activated at the time of starting and measures the time over a predetermined interval, and the time when the time measuring means 42 completes the time measurement over the interval, are obtained by the monitoring means 41. An alarm means 43 that compares the obtained integrated value or maximum length with a predetermined upper limit value and issues an alarm indicating that the former exceeds the latter is provided.
[0025]
In the fourth wireless receiver configured as described above, the reference generation means 11 compensates for the fluctuation of the oscillation frequency in the operating temperature range and outputs a reference signal having a frequency shifted over a value given from the outside. Generate. The reference wave generating means 20 generates a reference carrier signal by performing frequency synthesis using the frequency of the reference signal as a reference.
[0026]
Further, when a pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than a received wave having a plurality of signal points having different phases in the signal space is given to the demodulating means 21, the demodulating means 21 Then, by demodulating the pseudo received wave with reference to the above-described reference carrier signal, a sequence of signal points taken by the pseudo received wave in the signal space is obtained, and the deviation detecting means 22 calculates the phase sequence of these signal points by 2 The frequency deviation of the pseudo received wave is obtained by performing the differentiation. The control means 23 gives the reference generating means 11 a value at which the frequency of the reference signal changes in the direction in which the deviation is compressed, and the initial setting means 25 thus makes the reference generating means 11 steady with a desired accuracy. The given value is stored in the storage means 24 as an initial value.
[0027]
Further, since the control means 23 reads out the initial value at the time of starting and supplies it to the reference generation means 11, the reference wave generation means 20 uses the reference signal whose frequency is set according to the initial value as a reference. Then, a carrier signal having the same frequency as that of the reference carrier signal described above is generated.
Therefore, the received wave given to the demodulating means 21 is demodulated by the demodulating means 21 in the same manner as the demodulation performed on the above-described pseudo received wave, so that it can be described quickly and accurately with the start. Converted to a sequence of signal points.
[0028]
In the above-described frequency control process, the monitoring unit 41 monitors the value given to the reference generation unit 11 by the control unit 16, and the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold value. Find the integrated value or the maximum length of that period. The time counting means 42 is activated at the time of starting and measures time over a predetermined interval, and the alarm means 43 is the integrated value or maximum value obtained by the monitoring means 41 when the time measuring means 42 completes the time measurement. Is compared with a predetermined upper limit value, and when the former exceeds the latter, an alarm indicating the fact is issued.
[0029]
Such an alarm means that “the accuracy of the frequency of the reference signal generated by the reference generation means has decreased according to the initial value held in the storage means”, and thus the initial value needs to be reset. This is reliably transmitted to the operator and the like, and quick maintenance adapted to changes over time, operating temperature, power supply voltage and other environmental conditions becomes possible.
A fifth radio receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for fluctuations in oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A reference wave generating unit 20 that generates a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating unit 11, and a received wave that has a plurality of signal points with different phases in the signal space. By demodulating the reference carrier signal given by the generating means 20 as a reference, the received signal obtains a sequence of signal points in the signal space, and a phase sequence of signal points obtained by the demodulation means 21. Deviation detecting means 22 for obtaining the deviation of the frequency of the received wave by differentiating twice, and the reference signal in the direction in which the deviation obtained by the deviation detecting means 22 is compressed In a radio receiver comprising a control means 23 for giving a value whose frequency changes to the reference generation means 11, a storage means 24 for holding an initial value of the value, and a frequency deviation and stability with respect to the received wave Is a value that is steadily given to the reference generation means 11 by the control means 23 to the reference generation means 11 when a pseudo reception wave that can be regarded as equivalent or higher is given to the demodulation means 21 instead of the reception wave. And an initial setting means 25 for storing the initial value stored in the storage means 24 as an initial value, and the control means 23 has means for reading the initial value stored in the storage means 24 at the time of start-up and giving it to the reference generating means 11. Further, when the deviation of the value given to the reference generation means 11 by the control means 16 with respect to the initial value falls below a predetermined threshold value, an averaging means 61 for holding an average value of the values, and an average The difference between the average value held by the means 61 and the initial value is taken, and the time for the frequency of the reference signal to converge with the desired accuracy exceeds the allowable maximum value from the time when the initial value is given to the reference generation means. An initial value updating means 62 for replacing the initial value held in the storage means 17 with an average value when the difference is large to the extent is provided.
[0030]
In the fifth radio receiver configured as described above, the averaging means 61 performs the value of the value given to the reference generating means 11 by the control means 16 in the same frequency control process as that of the fourth radio receiver described above. When the deviation from the initial value falls below a predetermined threshold, the average value is retained. The initial value updating means 62 takes the difference between the average value and the above-described initial value, and allows a time for the frequency of the reference signal to converge with a desired accuracy from the time when the initial value is given to the reference generating means. When the difference is large enough to exceed the maximum value, the initial value held in the storage means 17 is replaced with the average value.
[0031]
In other words, the initial value that should be applied at the time of starting is dynamically updated by adapting flexibly to changes over time, operating temperature, and power supply voltage. The frequency of the reference signal is set.
A sixth wireless receiver according to the present invention includes a reference generation unit 11 that generates a reference signal having a frequency that is compensated for a variation in oscillation frequency in the operating temperature range and that is shifted over a value given from the outside. A reference wave generating unit 20 that generates a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating unit 11, and a received wave that has a plurality of signal points with different phases in the signal space. By demodulating the reference carrier signal given by the generating means 20 as a reference, the received signal obtains a sequence of signal points in the signal space, and a phase sequence of signal points obtained by the demodulation means 21. Deviation detecting means 22 for obtaining the deviation of the frequency of the received wave by differentiating twice, and the reference signal in the direction in which the deviation obtained by the deviation detecting means 22 is compressed In a radio receiver comprising a control means 23 for giving a value whose frequency changes to the reference generation means 11, a storage means 24 for holding an initial value of the value, and a frequency deviation and stability with respect to the received wave Is a value that is steadily given to the reference generation means 11 by the control means 23 to the reference generation means 11 when a pseudo reception wave that can be regarded as equivalent or higher is given to the demodulation means 21 instead of the reception wave. And an initial setting means 25 for storing the initial value stored in the storage means 24 as an initial value, and the control means 23 has means for reading the initial value stored in the storage means 24 at the time of start-up and giving it to the reference generating means 11. Further, when the deviation of the value given to the reference generation means 11 by the control means 16 with respect to the initial value falls below a predetermined threshold value, the averaging means 61 that holds the average value of values, The time-counting means 71 that is activated and measures time over a predetermined interval, and when the time-measurement means 71 completes time-measurement over the interval, the difference between the average value held by the averaging means 61 and the initial value is calculated. When the initial value is given to the reference generation means 11, the storage means has a difference so large that the time required for the frequency of the reference signal to converge with a desired accuracy exceeds an allowable maximum value. And an initial value updating means 72 for replacing the initial value held at 17 with an average value.
[0032]
In the sixth radio receiver configured as described above, the averaging means 61 performs the calculation of the value given to the reference generating means 11 by the control means 16 in the same frequency control process as that of the fourth radio receiver described above. When the deviation from the initial value falls below a predetermined threshold, the average value is retained.
Moreover, the time measuring means 71 is started at the time of starting and measures time over a predetermined interval. The initial value updating means 72 takes the difference between the average previously held by the averaging means 61 and the initial value when the time measuring means 71 completes the time measurement, and gives this initial value to the reference generating means 11. If the difference is so large that the time required for the frequency of the reference signal to converge with a desired accuracy from the time point exceeds the maximum allowable value, the initial value held in the storage means is averaged. Replace.
[0033]
In other words, the initial value to be applied at the time of start-up is dynamically updated to an appropriate value at a cycle adapted to the rate of aging. The state that “the frequency of the signal is set” is maintained.
As shown in FIG. 3, reference generation means 11 for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and shifted over a value given from the outside, and reference generation means The local oscillating means 12 that generates a local oscillation signal by performing frequency synthesis using the frequency of the reference signal generated by the reference 11 as a reference, and performs the frequency synthesis by using the frequency of the reference signal generated by the reference generating means 11 as a reference. Reference wave generating means 20 for generating a carrier wave signal, and a received wave having a plurality of signal points having different phases in the signal space are taken, and the received wave is frequency-converted with reference to a local signal provided by the local oscillating means 12 The frequency conversion means 13 for generating the intermediate frequency signal and the intermediate frequency signal generated by the frequency conversion means 13 as the reference wave generating means. By demodulating the reference carrier signal given by 20 as a reference, a demodulator 31 that obtains a sequence of signal points that the received wave takes in the signal space, and a phase sequence of the signal points obtained by the demodulator 31 twice. Deviation detecting means 32 for obtaining the frequency deviation of the received wave by differentiating, and control for giving the reference generating means 11 a value for changing the frequency of the reference signal in a direction in which the deviation obtained by the deviation detecting means 32 is compressed. In the wireless receiver comprising the means 33, the storage means 34 used for holding the initial value of the value and the pseudo received wave whose frequency deviation and stability can be regarded as equal to or higher than the received wave are When given to the frequency conversion means 13 instead of the received wave, the value that is steadily given to the reference generation means 11 with a desired accuracy is stored in the storage means 34 as an initial value. Initial setting means 35, and the control means 33 reads out the initial value held in the storage means 34 at the time of starting and supplies it to the reference generation means 11 in addition to the above-described monitoring. A configuration comprising the means 41, the timing means 42 and the alarm means 43 or a construction comprising the averaging means 61 and the initial value updating means 62 or a construction comprising the averaging means 61, the timing means 71 and the initial value updating means 72 is applied. It is also possible to do.
[0034]
Further, in the first to sixth radio receivers described above, a plug 81 that is attached to a housing and is used for connection with a signal source that provides a pseudo received wave, the received wave and the plug 81 are provided. It is also possible to comprise a switching control means 82 that selectively selects any one of the pseudo received waves given from the signal source via the above and supplies them to the frequency converting means 13 or the demodulating means 14. .
[0035]
In the wireless receiver configured in this way, the pseudo received wave to be given to the frequency converting means and the demodulating means in place of the received wave in order for the initial setting means to store the initial value in the storage means, Since it is reliably given from outside without any change in the mounting status, the initial value is set efficiently and with high accuracy.
Further, as shown in FIG. 4, the local oscillator signal generated by the wireless receiver 91 configured as shown in any of FIGS. 1 to 3 and the local oscillating means constituting the wireless receiver 91 is obtained. A modulation method common to the received wave by performing either or both of the frequency conversion as a reference and the modulation based on the reference carrier signal generated by the reference wave generating means constituting the wireless receiver 91 It is also possible to configure a radio transceiver by including a transmission means 92 to which a multiple access scheme is applied and which generates a transmission wave modulated with transmission information.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 5 is a diagram showing a basic configuration of first to third radio receivers according to the present invention.
In the figure, the same components as those shown in FIG. 15 are denoted by the same reference numerals, and description thereof is omitted here.
[0037]
The difference between the configuration of the wireless receiver shown in FIG. 5 and the configuration of the conventional example shown in FIG. 15 is that a signal generator provided outside the multiplier 161 via a low-noise amplifier 101 and a band-pass filter 102 is used. 103 is connected, and the memory 104 is connected to the control unit 167.
As for the correspondence between the configuration of the wireless receiver shown in FIG. 5 and the block diagram shown in FIG. 1, the VCTCXO 170 corresponds to the reference generation unit 11, the local oscillation unit 171 corresponds to the local oscillation unit 12, The noise amplifier 101, the band pass filter 102, the multiplier 161 and the band pass filter 162 correspond to the frequency converting means 13, the demodulator 163, the local oscillator 164 and the phase detector 165 correspond to the demodulating means 14, and a frequency error detector. Reference numeral 166 corresponds to the deviation detection unit 15, the control unit 167 and the D / A converter 169 correspond to the control unit 16, the memory 104 corresponds to the storage unit 17, and the control unit 167 corresponds to the initial setting unit 18.
[0038]
The operation of the wireless receiver shown in FIG. 5 will be described below.
In the wireless receiver shown in FIG. 5, the temperature, power supply voltage, and other operating environments are set to a standard state in the maintenance process appropriately performed in the process of adjustment and operation performed by the manufacturer prior to shipment. And the output of the signal generator 103 is connected to the input of the low noise amplifier 101.
[0039]
Further, the signal generator 103 is a pseudo signal whose frequency matches the nominal frequency of the received wave with high stability and accuracy (for example, 0.01 ppm) and is periodically modulated with a known preamble signal or unique word. A reception wave (hereinafter referred to as “pseudo reception wave”) is generated.
When a control signal (for example, given by a tester not shown) is given from the outside, the control unit 167 shifts to an “initial value setting mode” in which the following operation is performed.
[0040]
In the initial value setting mode, the control unit 167 performs the multiplier 161, the band pass filter 162, the demodulator 163, the local oscillator 164, the phase detector 165, the frequency error detector 166, D, similarly to the conventional example shown in FIG. / A converter 169, frequency divider 172, and local oscillator 171 are linked so that “the frequency of the local oscillation signal generated by local oscillator 171 matches the frequency of the pseudo received wave with a desired accuracy”. The transmission frequency of the VCTCXO 170 is set.
[0041]
Further, the control unit 167 waits for a time during which the transmission frequency of the VCTCXO 170 set in this way converges with high accuracy to a value adapted to the frequency of the pseudo reception wave, and at that time, D / A conversion is performed as a digital signal. The value (hereinafter referred to as “initial value”) given to the device 169 is written into the memory 104.
In the state where the radio receiver shown in FIG. 5 is operating to receive the received wave coming from the radio base station, the control signal is not given to the control unit 167 and the low noise amplifier 101 is used. The received wave is given through an antenna system or a front-end circuit (both not shown) instead of the signal generator 103 described above.
[0042]
On the other hand, since the control unit 167 reads the value stored in the memory 104 in advance at the time of start-up and gives a digital signal indicating the value to the D / A converter 169, the transmission frequency of the VCTCXO 170 is actually received as a pseudo received wave. As long as the frequency deviation from the received wave to be received is small enough to be allowed, the initial value adapted to the frequency of the received wave is quickly set upon starting.
[0043]
Further, the control unit 167 needs to correct the error due to variations in the operating temperature, the power supply voltage, the characteristics of the VCTCXO 170, and the secular change with respect to the transmission frequency of the VCTCXO 170 obtained according to the digital signal. The correction is performed in the same manner as in the conventional example, starting from the time when the above-described initial value is set.
As described above, in the wireless receiver shown in FIG. 5, immediately after the start, the control unit 167 completes the pull-in quickly without starting a new pull-in of the transmission frequency of the VCTCXO 170 as in the conventional example. Can do.
[0044]
Therefore, the radio receiver shown in FIG. 5 is in a state in which a desired received wave can be received promptly immediately after startup, and it is possible to quickly wait for an outgoing call or an incoming call according to a user's request.
In the wireless receiver shown in FIG. 5, the control unit 167 waits for a predetermined period from the time when the pseudo received wave is given by the signal generator 103, so that the initial value to be held in the memory 104. However, without waiting in this way, for example, when a value that should be a candidate for the initial value is updated, a difference from the value of the candidate that has been similarly updated in advance is calculated, and the When the difference is the same with a desired accuracy, the latest value may be set as the initial value.
[0045]
FIG. 6 is a diagram showing a basic configuration of fourth to sixth radio receivers according to the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 5 are given the same reference numerals and description thereof is omitted here.
The difference between the configuration of the radio receiver shown in FIG. 6 and the radio receiver shown in FIG. 5 is that the output of the local oscillating unit 171 a instead of the local oscillator 164 is connected to the carrier wave input of the demodulator 163. The other input is connected to the output of the local oscillator 171a instead of the local oscillator 171 and the frequency divider 172.
[0046]
Note that the configuration of the local oscillation unit 171a is the same as that of the local oscillation unit 171 shown in FIG. 5. Therefore, in the following, the same reference numerals with the suffix “a” added are assigned to the corresponding components. The illustration is omitted, and the description is omitted.
As for the correspondence relationship between the radio receiver shown in FIG. 6 and the block diagram shown in FIG. 2, VCTCXO 170 corresponds to reference generation means 11, local oscillator 171a corresponds to reference wave generation means 20, and low noise. The amplifier 101, the band pass filter 102, the multiplier 161, the band pass filter 162, the demodulator 163, the local oscillator 164 a and the phase detector 165 correspond to the demodulator 21, and the frequency error detector 166 corresponds to the deviation detector 22. The control unit 167 and the D / A converter 169 correspond to the control unit 23, the memory 104 corresponds to the storage unit 24, and the control unit 167 corresponds to the initial setting unit 25.
[0047]
The operation of the wireless receiver shown in FIG. 6 will be described below.
The multiplier 161 and the band-pass filter 162 take the product of the local oscillation signal generated by the local oscillator 164a and the pseudo reception wave and reception wave given through the low-noise amplifier 101 and the band-pass filter 102. Each of the pseudo received wave and the received wave is converted into an intermediate frequency signal.
[0048]
The local oscillation unit 171a generates a reference carrier signal by performing indirect frequency synthesis based on the frequency of the signal provided by the VCTCXO 170 via the frequency divider 172a. The demodulator 163 demodulates the above-described intermediate frequency signal with reference to the reference carrier signal, thereby outputting I channel and Q channel baseband signals orthogonal to each other in parallel.
[0049]
Further, the frequency error detector 166 calculates the frequency deviation in the same manner as in the conventional example, and the control unit 167 determines whether or not the frequency deviation is equal to “0” with a predetermined accuracy. If the result is false, a digital signal indicating a value proportional to the frequency deviation is supplied to the D / A converter 169.
Note that the operation of each unit in the wireless receiver shown in FIG. 6 is the same as the operation in the wireless receiver shown in FIG.
[0050]
That is, the radio receiver shown in FIG. 6 differs from the radio receiver shown in FIG. 5 in that the local oscillator 171a generates a reference carrier signal to be supplied to the demodulator 163, but the controller 167 In the feedback loop reaching the local oscillation unit 171a through the frequency detector 163, the phase detector 165, the frequency error detector 166, the D / A converter 169, the VCTCXO 170 and the frequency divider 172a, and In the adjustment and maintenance process, an initial value to be held in the memory 104 is obtained in the same manner as the wireless receiver shown in FIG.
[0051]
Therefore, in the wireless receiver shown in FIG. 6, as in the wireless receiver shown in FIG. 5, immediately after start-up, the wireless receiver immediately shifts to “a state in which a desired received wave can be received” and the user's It is possible to quickly wait for outgoing calls and incoming calls upon request.
FIG. 7 is a diagram showing another configuration example of the wireless receiver related to the present invention.
In the figure, components having the same functions and configurations as those described in FIGS. 5 and 6 are given the same reference numerals, and description thereof is omitted here.
[0052]
The configuration of the radio receiver shown in FIG. 7 is shown in FIG. 1 by connecting the output of the VCTCXO 170 to the inputs of the local oscillator 171 shown in FIG. 5 and the local oscillator 171a shown in FIG. The frequency control configuration and the frequency control configuration shown in FIG. 2 are applied in parallel.
As for the correspondence relationship between the radio receiver shown in FIG. 7 and the block diagram shown in FIG. 3, VCTCXO 170 corresponds to reference oscillation means 11, local oscillation section 171a corresponds to reference wave generation means 20, and local oscillation. The unit 171 corresponds to the local oscillator 12, the low noise amplifier 101, the band pass filter 102, the multiplier 161 and the band pass filter 162 correspond to the frequency converter 13, and the demodulator 163 and the phase detector 165 are demodulator 31. The frequency error detector 166 corresponds to the deviation detection means 32, the control unit 167 and the D / A converter 169 correspond to the control means 33, the memory 104 corresponds to the storage means 34, and the control unit 167 This corresponds to the initial setting means 35.
[0053]
Hereinafter, the operation of the wireless receiver shown in FIG. 7 will be described.
In the wireless receiver illustrated in FIG. 7, the control unit 167 obtains an initial value by performing the same processing as the control unit 167 in the wireless receiver illustrated in FIGS. 5 and 6, and stores the initial value in the memory 104. At the time of start-up, the initial value is read out and supplied to the D / A converter 169, and the value fed back through the above-described footback loop is determined in a leading manner.
[0054]
Therefore, the frequency of the local oscillation signal to be supplied to the multiplier 161 can be set with a desired accuracy based on the frequency division ratios M and N of the frequency dividers 172 and 176, and the reference carrier wave to be supplied to the demodulator 163. As long as the signal frequency can be set with a desired accuracy based on the frequency dividing ratios Ma and Na of the frequency dividers 172a and 176a, the VCTCXO 170 can be used at low cost by sharing the VCTCXO 170. Performance equivalent to the corresponding embodiment can be obtained.
[0055]
FIG. 8 is a diagram showing an embodiment of a first wireless transceiver according to the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 5 are given the same reference numerals and description thereof is omitted here.
The difference between the present embodiment and the wireless receiver shown in FIG. 5 is that the timer 110 is connected to the input / output port of the control unit 167 and the alarm generator 111 is connected to the output port of the control unit 167. In the point.
[0056]
In addition, regarding the correspondence relationship between this embodiment and the block diagrams shown in FIGS. 1 to 3, the control unit 167 corresponds to the monitoring unit 41, the timer 110 corresponds to the timing units 42 and 51, and the control unit 167 and the alarm The generator 111 corresponds to the alarm means 43 and 52.
The operation of this embodiment will be described below.
Of the operations of the respective parts, operations other than those described below are basically the same as those in the embodiment shown in FIG.
[0057]
The memory 104 stores in advance the initial value obtained in the initial value setting mode.
At the time of starting, the control unit 167 reads the initial value from the memory 104 and gives it to the D / A converter 169 and starts the timer 110. Furthermore, the control unit 167 compares the difference between the value previously given to the D / A converter 169 and the updated value of the value with a preset threshold value. As a result of the comparison, the control unit 167 integrates the length of a period in which the former exceeds the latter (a process for further drawing in the transmission frequency of the VCTCXO 170 is necessary).
[0058]
The timer 110 has an interval of a predetermined long period (for example, several weeks to several years), and when a period corresponding to the interval elapses, a notification to that effect is given to the control unit 167.
When recognizing this notification, the control unit 167 obtains a ratio of the length of the period accumulated up to that time to the above-described interval, and drives the alarm generator 111 when the ratio exceeds a predetermined upper limit value. To do.
[0059]
However, when the ratio is less than the upper limit value, the control unit 167 initializes the length of the accumulated period to “0”, restarts the timer 110, and resumes the above-described accumulation.
As described above, according to the present embodiment, the oscillation frequency of the VCTCXO 170 is shifted to an unacceptable level due to aging of the characteristics of the VCTCXO 170 and the like, and the temperature and the power supply voltage are significantly changed. The operator is surely notified of significant degradation of transmission characteristics due to inadequateness.
[0060]
In the present embodiment, the alarm generator 111 is driven based on the time rate of the length of the accumulated period. For example, the control unit 167 sequentially selects “the maximum length in which similar periods continue. Can be stored in the memory 104 and the alarm generator 111 can be driven regardless of the time rate when the maximum length exceeds a predetermined threshold.
[0061]
In this embodiment, the timer 110 is applied as a reference for calculating the time ratio of the accumulated period length. For example, the control unit 167 performs adjustments performed by the manufacturer prior to shipping. It is also possible to prompt the operator to reset the initial value by driving the alarm generator 111 when the time counted from the time point becomes equal to a predetermined interval.
[0062]
FIG. 9 is a diagram showing an embodiment of a second radio receiver according to the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 5 are given the same reference numerals and description thereof is omitted here.
The difference between the present embodiment and the wireless receiver shown in FIG. 5 is that the average value memory 120 is connected to the control unit 167 in addition to the memory 104.
[0063]
Incidentally, regarding the correspondence relationship between this embodiment and the block diagrams shown in FIGS. 1 to 3, the control unit 167 and the average value memory 120 correspond to the averaging unit 61, and the control unit 167 corresponds to the initial value update unit 62. To do.
The operation of this embodiment will be described below.
Of the operations of the respective parts, operations other than those described below are basically the same as those in the embodiment shown in FIG.
[0064]
The control unit 167 calculates the average value of the value given as a digital signal to the D / A converter 169 and stores it in the memory 104 every time the value is updated.
In addition, the control unit 167 obtains a difference between the updated value and the calculated average value as described above. Further, the control unit 167 compares the absolute value of the difference with a preset threshold value, and does not perform any special processing when the former is below the latter, but conversely when the former is above the latter The corresponding average value is stored in the memory 104 as an initial value.
[0065]
As described above, according to the present embodiment, the value set in accordance with the actually received received wave is dynamically set as the initial value. For example, the operating temperature, the power supply voltage, the frequency of the received wave, etc. Even when the characteristics of the VCTCXO 170 or the like greatly change according to aging, it is possible to shift to a state in which a reception operation can be performed at an early stage with the start-up.
[0066]
In this embodiment, every time a value given as a digital signal to the D / A converter 169 is updated, the average value is updated regardless of the value. However, the control unit 167 Can be reliably recognized, for example, during a period when the electric field strength of the received wave is extremely low or when it is obvious that the received wave is not received, a process of omitting the update of the average value is performed. Also good.
[0067]
FIG. 10 is a diagram showing an embodiment of a third wireless receiver according to the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 9 are given the same reference numerals, and description thereof is omitted here.
The difference between the present embodiment and the embodiment shown in FIG. 9 is that a timer 130 is connected to the input / output port of the control unit 167.
[0068]
In the correspondence between the present embodiment and the block diagrams shown in FIGS. 1 to 3, the timer 130 corresponds to the time measuring means 71, and the average value memory 120 and the control unit 167 correspond to the initial value updating means 72.
The operation of this embodiment will be described below.
Of the operations of the respective units, operations other than those described below are basically the same as those in the embodiment shown in FIG.
[0069]
The control unit 167 activates the timer 130 by designating a predetermined interval value (for example, several weeks to several years) at the start.
However, even if the updated average value is stored in the memory 120, the control unit 167 does not compare the average value with the initial value stored in the memory 104.
In addition, when the control unit 167 is notified from the timer 130 that “the time measurement over the above-described interval value has been completed” in the process of repeating the process of updating the average value, the average value memory is stored at that time. The average value stored in 120 is stored in the memory 104 as an initial value.
[0070]
As described above, according to the present embodiment, the initial value is replaced with the average value obtained by adapting to the actual received wave in the period determined by the interval value of the timer 130, so that the control unit 167 is required. Increase in the amount of processing to be performed, and flexibly adapting to changes in operating temperature, power supply voltage, frequency deviation of received waves and other characteristics, and changes over time in characteristics of the VCTCXO170, etc. An environment capable of transitioning to a state is maintained.
[0071]
FIG. 11 is a diagram illustrating a configuration example of a wireless receiver related to the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 5 are given the same reference numerals and description thereof is omitted here.
The radio receiver shown in FIG. 11 differs from the radio receiver shown in FIG. 5 in that an antenna switch 140 is disposed in front of the low noise amplifier 101, and the control terminal of the antenna switch 140 is a control unit 167. The received wave and the pseudo received wave are both supplied to the low noise amplifier 101 via the antenna switch 140, and further, as shown in FIG. One antenna terminal of the antenna switch 140 is connected to a signal generator serving as a generation source of a pseudo reception wave through an adjustment connector 141 attached to the hole.
[0072]
In addition, regarding the correspondence between the wireless receiver shown in FIG. 11 and the block diagrams shown in FIGS. 1 to 3, the adjustment connector 141 corresponds to the plug 81, and the antenna switch 140 and the control unit 167 are switching control means. 82.
Hereinafter, the operation of the wireless receiver shown in FIG. 11 will be described.
When a control signal is given from the outside, the control unit 167 shifts to the “initial value setting mode” and controls the antenna switch 140 to thereby input a signal generator to the input of the low noise amplifier 101 via the antenna switch 140. Connect the output of.
[0073]
As described above, according to the wireless receiver shown in FIG. 11, in the “initial value setting mode”, the state of being mounted inside the housing is maintained, and the pseudo received wave is reliably given.
Therefore, the initial value error caused by the difference in the mounting state between the normal operation state and the “initial value setting mode” is surely suppressed, and the initial value is set. It is done inexpensively and reliably.
[0074]
In the radio receiver shown in FIG. 11, an antenna switch 140 is added as an element for selecting one of the antenna system and the signal generator to be connected to the input of the low noise amplifier 101. The antenna switch 140 may be shared as an antenna switch used for selection diversity.
FIG. 13 is a diagram illustrating a configuration example of a wireless transceiver related to the present invention.
[0075]
In the figure, components having the same functions and configurations as those shown in FIG. 5 are given the same reference numerals and description thereof is omitted here.
The configuration difference between the radio transceiver shown in FIG. 13 and the embodiment shown in FIG. 5 is that an antenna 150 is added, and further, a transmission connected to the feeding end of the antenna 150 and the output of the local oscillation unit 171. The system 151 is provided.
[0076]
The transmission system 151 includes a transmission information processing unit 152, a modulator 153, a band pass filter (BPF) 154, and a band pass filter 154, which are connected in cascade, and are connected to the local oscillation unit 171 from the output of the local oscillation unit 171. A multiplier 155 that receives the emission signal, and a band-pass filter (BPF) 156 and a power amplifier 157 that are cascade-connected between the output of the multiplier 155 and the feeding end of the antenna 150. .
[0077]
As for the correspondence between the radio transceiver shown in FIG. 13 and the block diagram shown in FIG. 4, the antenna 150 and the transmission system 151 correspond to the transmission means 92, and all other components are related to the radio receiver 91. Correspond.
Hereinafter, the operation of the radio transceiver shown in FIG. 13 will be described.
The transmission information processing unit 152 takes in transmission information given from an information source (not shown) and to be wirelessly transmitted to the opposite radio base station, and multiplies a baseband signal indicating the transmission information by a predetermined spreading code. To generate a spread signal. The modulator 153 performs primary transmission on the spread signal by performing a modulation process adapted to the wireless transmission path (here, for the sake of simplicity, it is assumed that the spread signal is adapted to the QPSK modulation method in the same manner as the received wave). Generate a signal.
[0078]
Band-pass filters 154 and 156 and multiplier 155 generate the transmission wave signal by taking the primary transmission signal and multiplying it by the local oscillation signal generated by local oscillation unit 171. The power amplifier 157 amplifies the transmission wave signal to a predetermined level and applies the amplified signal to the feeding end of the antenna 150.
This transmission wave signal is obtained by taking the product of the local oscillation signal generated by the local oscillation unit 171 with the oscillation frequency of the VCTCXO 170 set under automatic control adapted to the frequency deviation of the reception wave as a reference. As long as the reference of the frequency given to the radio station that is the transmission destination of the transmission wave signal and the radio station that is the transmission source of the reception wave is the same or can be considered to be common, the transmission system The transmission quality of the wireless transmission path can be improved stably and reliably.
[0079]
In the above-described embodiment, the example applied to any one of the frequency control configurations illustrated in FIGS. 1 to 3 has been described. However, for example, as illustrated in FIG. 14, the local oscillation units 171 and 171 a are respectively provided. Correspondingly, the D / A converters 169 and 169a and the VCTCXOs 170 and 170a are provided, which is related to the combination of the frequency of the local signal used for frequency conversion and the frequency of the carrier signal used for demodulation and the deviation of these frequencies. It is also possible to adapt flexibly to requirements.
[0080]
Further, in each of the embodiments described above, heterodyne detection based on the single super system is performed. However, the present invention also relates to a reception system in which heterodyne detection or homodyne detection based on the double super system or triple super system is performed, for example. Applicable.
Further, in each of the above-described embodiments, an example in which the configuration of the present invention is applied to a mobile station apparatus of a CDMA mobile communication system has been described. If the allowable maximum value of the deviation is small, the rise time at start-up can be greatly shortened when applied to any wireless transmission system or communication system.
[0081]
【The invention's effect】
As described above, in the first and fourth radio receivers according to the present invention, the received wave is demodulated promptly and accurately upon start-up, and it is ensured that the initial value needs to be reset. It is transmitted to the person, etc., and quick maintenance adapted to changes over time, operating temperature, power supply voltage and other environmental conditions becomes possible.
[0082]
Further, in the second and fifth radio receivers according to the present invention, the frequency of the reference signal is set promptly upon starting in various environments without manual intervention.
Furthermore, in the third and sixth radio receivers according to the present invention, the state that “the frequency of the reference signal is set promptly upon start-up” is maintained over a long period of time without manual intervention.
[0083]
Therefore, in radio transmission systems and communication systems to which these inventions are applied, the maximum allowable frequency deviation required for consistency with the applied modulation scheme and multiple access scheme is flexibly adapted to the form of maintenance and operation. The start-up time at the start-up can be greatly shortened and the service quality for the user can be improved.
[Brief description of the drawings]
FIG. 1 is a principle block diagram of first to third radio receivers according to the present invention.
FIG. 2 is a principle block diagram of fourth to sixth radio receivers according to the present invention.
FIG. 3 is a principle block diagram of another radio receiver according to the present invention.
FIG. 4 is a principle block diagram of a radio transceiver according to the present invention.
FIG. 5 is a diagram showing a basic configuration of first to third radio receivers according to the present invention.
FIG. 6 is a diagram showing a basic configuration of fourth to sixth radio receivers according to the present invention.
FIG. 7 is a diagram showing a configuration example of a wireless receiver related to the present invention.
FIG. 8 is a diagram showing an embodiment of a first radio receiver according to the present invention.
FIG. 9 is a diagram showing an embodiment of a second radio receiver according to the present invention.
FIG. 10 is a diagram showing an embodiment of a third wireless receiver according to the present invention.
FIG. 11 is a diagram illustrating a configuration example of a wireless receiver related to the present invention.
FIG. 12 is a diagram showing a mounting position of the connector.
FIG. 13 is a diagram illustrating a configuration example of a wireless transceiver related to the present invention.
FIG. 14 is a diagram illustrating a configuration example of a wireless receiver related to the present invention.
FIG. 15 is a diagram illustrating a configuration example of a conventional radio receiver adapted to a CDMA system.
FIG. 16 is a diagram illustrating a problem of a conventional example.
[Explanation of symbols]
11 Standard generation means
12 Local oscillation means
13 Frequency conversion means
14, 21, 31 Demodulation means
15, 22, 32 Deviation detection means
16, 23, 33 Control means
17, 24, 34 Storage means
18, 25, 35 Initial setting means
20 Reference wave generating means
41 Monitoring means
42, 51, 71 Timekeeping means
43,52 Alarm means
61 Averaging means
62, 72 Initial value updating means
81 Plug
82 Switching control means
91 Wireless receiver
92 Transmission means
101 Low noise amplifier
102, 154, 156, 162 Band pass filter (BPF)
103 Signal generator
104 memory
110, 130 timer
111 Alarm generator
120 Average memory
140 Antenna switch
141 Adjustment connector
150 antenna
151 Transmission system
152 Transmission Information Processing Unit
153 modulator
155, 161 multiplier
157 Power amplifier
163 Demodulator
164,164a Local oscillator
165 Phase detector
166 Frequency error detector
167 control unit
169 D / A converter
170 Voltage controlled temperature compensated crystal oscillator (VCTCXO)
172, 172a, 176 divider
171 and 171a Local oscillator
173 Phase comparator
174 Low-pass filter (LPF)
175 Voltage controlled oscillator

Claims (6)

Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Local oscillation means for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means;
Frequency converting means for generating an intermediate frequency signal by taking in a received wave having a plurality of signal points having different phases in a signal space and frequency-converting the received wave with reference to a local signal provided by the local oscillating means When,
Demodulation means for demodulating the intermediate frequency signal generated by the frequency conversion means to obtain a sequence of signal points that the received wave takes in the signal space;
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave whose frequency deviation and stability can be regarded as equal to or higher than that of the received wave is given to the frequency converting means instead of the received wave, the reference generating means by the control means Initial setting means for storing in the storage means a value that is steadily given with a desired accuracy as the initial value,
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
Further, the value given to the reference generation means by the control means is monitored, and the integrated value of the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold or the maximum length of the period is determined. The monitoring means sought,
A time-measurement means that is activated at the start and performs time-measurement over a predetermined interval;
When the time measuring means completes the time measurement over the interval, the integrated value or the maximum length obtained by the monitoring means is compared with a predetermined upper limit value, and when the former exceeds the latter, that effect A wireless receiver comprising: alarm means for issuing an alarm indicating Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Local oscillation means for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means;
Frequency converting means for generating an intermediate frequency signal by taking in a received wave having a plurality of signal points having different phases in a signal space and frequency-converting the received wave with reference to a local signal provided by the local oscillating means When,
Demodulation means for demodulating the intermediate frequency signal generated by the frequency conversion means to obtain a sequence of signal points that the received wave takes in the signal space;
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave whose frequency deviation and stability can be regarded as equal to or higher than that of the received wave is given to the frequency converting means instead of the received wave, the reference generating means by the control means Initial setting means for storing in the storage means a value that is steadily given with a desired accuracy as the initial value,
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
And an averaging means for taking an average of the values when the deviation from the initial value of the value given to the reference generating means by the control means falls below a predetermined threshold value;
The difference between the average held by the averaging means and the initial value is taken, and the maximum allowable time for the frequency of the reference signal to converge with a desired accuracy from the time when the initial value is given to the reference generating means. An initial value updating means for replacing an initial value held in the storage means with an average when the difference is large enough to exceed the value. Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Local oscillation means for generating a local oscillation signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generation means;
Frequency converting means for generating an intermediate frequency signal by taking in a received wave having a plurality of signal points having different phases in a signal space and frequency-converting the received wave with reference to a local signal provided by the local oscillating means When,
Demodulation means for demodulating the intermediate frequency signal generated by the frequency conversion means to obtain a sequence of signal points that the received wave takes in the signal space;
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave whose frequency deviation and stability can be regarded as equal to or higher than that of the received wave is given to the frequency converting means instead of the received wave, the reference generating means by the control means Initial setting means for storing in the storage means a value that is steadily given with a desired accuracy as the initial value,
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
And an averaging means for taking an average of the values when the deviation from the initial value of the value given to the reference generating means by the control means falls below a predetermined threshold value;
A time-measurement means that is activated at the start and performs time-measurement over a predetermined interval;
When the time measuring means completes the time measurement over the interval, a difference between the average held by the averaging means and the initial value is taken, and from the time when the initial value is given to the reference generating means, the reference signal Initial value updating means for replacing the initial value held in the storage means with the average when the difference is so large that the time required for the frequency to converge with a desired accuracy exceeds the allowable maximum value. A wireless receiver characterized by that. Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Reference wave generating means for generating a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating means;
Demodulate a received wave that takes a plurality of signal points having different phases in the signal space with reference to the reference carrier signal given by the reference wave generating means, so that the received wave obtains a sequence of signal points in the signal space Means,
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave is given to the demodulating means instead of the received wave, the control means sends the reference generating means to the reference generating means. Initial setting means for storing in the storage means a value that is steadily given at a desired accuracy as the initial value;
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
Further, the value given to the reference generation means by the control means is monitored, and the integrated value of the length of the period in which the deviation of the value from the initial value exceeds a predetermined threshold or the maximum length of the period is determined. The monitoring means sought,
A time-measurement means that is activated at the start and performs time-measurement over a predetermined interval;
When the time measuring means completes the time measurement over the interval, the integrated value or the maximum length obtained by the monitoring means is compared with a predetermined upper limit value, and when the former exceeds the latter, that effect A wireless receiver comprising: alarm means for issuing an alarm indicating Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Reference wave generating means for generating a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating means;
Demodulate a received wave that takes a plurality of signal points having different phases in the signal space with reference to the reference carrier signal given by the reference wave generating means, so that the received wave obtains a sequence of signal points in the signal space Means,
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave is given to the demodulating means instead of the received wave, the control means sends the reference generating means to the reference generating means. Initial setting means for storing in the storage means a value that is steadily given at a desired accuracy as the initial value;
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
And an averaging means for taking an average of the values when the deviation from the initial value of the value given to the reference generating means by the control means falls below a predetermined threshold value;
The difference between the average held by the averaging means and the initial value is taken, and the maximum allowable time for the frequency of the reference signal to converge with a desired accuracy from the time when the initial value is given to the reference generating means. An initial value updating means for replacing an initial value held in the storage means with an average when the difference is large enough to exceed the value. Reference generation means for generating a reference signal having a frequency that is compensated for fluctuations in the oscillation frequency in the operating temperature range and is shifted over a value given from the outside;
Reference wave generating means for generating a reference carrier signal by performing frequency synthesis with reference to the frequency of the reference signal generated by the reference generating means;
Demodulate a received wave that takes a plurality of signal points having different phases in the signal space with reference to the reference carrier signal given by the reference wave generating means, so that the received wave obtains a sequence of signal points in the signal space Means,
Deviation detecting means for obtaining a frequency deviation of the received wave by differentiating twice the phase sequence of the signal points obtained by the demodulating means;
In a radio receiver comprising: a control unit that provides the reference generation unit with a value that changes the frequency of the reference signal in a direction in which the deviation obtained by the deviation detection unit is compressed.
Storage means for holding an initial value of the value;
When a pseudo received wave that can be regarded as having equal or higher frequency deviation and stability than the received wave is given to the demodulating means instead of the received wave, the control means sends the reference generating means to the reference generating means. Initial setting means for storing in the storage means a value that is steadily given at a desired accuracy as the initial value;
The control means includes
Means for reading the initial value stored in the storage means at the time of starting and giving the reference value to the reference generation means;
And an averaging means for taking an average of the values when the deviation from the initial value of the value given to the reference generating means by the control means falls below a predetermined threshold value;
A time-measurement means that is activated at the start and performs time-measurement over a predetermined interval;
When the time measuring means completes the time measurement over the interval, a difference between the average held by the averaging means and the initial value is taken, and from the time when the initial value is given to the reference generating means, the reference signal Initial value updating means for replacing the initial value held in the storage means with the average when the difference is so large that the time required for the frequency to converge with a desired accuracy exceeds the allowable maximum value. A wireless receiver characterized by that.

Images