WO2004006476A1 - 無線受信機 - Google Patents
無線受信機 Download PDFInfo
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- WO2004006476A1 WO2004006476A1 PCT/JP2002/006788 JP0206788W WO2004006476A1 WO 2004006476 A1 WO2004006476 A1 WO 2004006476A1 JP 0206788 W JP0206788 W JP 0206788W WO 2004006476 A1 WO2004006476 A1 WO 2004006476A1
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- Prior art keywords
- level
- signals
- frequency conversion
- wireless receiver
- signal
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 89
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 230000001629 suppression Effects 0.000 claims description 15
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 31
- 238000010586 diagram Methods 0.000 description 30
- 238000001914 filtration Methods 0.000 description 20
- 230000006978 adaptation Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Definitions
- the present invention enables heterodyne detection for each channel by demultiplexing a multiplexed signal generated based on a frequency multiplexing method and having an occupied band in a high frequency band higher than the quasi-millimeter wave band.
- ⁇ rn ⁇ rn
- FIG. 5 is a diagram illustrating a configuration example of a conventional access system.
- an access system is formed between a transmitting end 60 and a receiving end 70 which are individually installed at two different geographically separated sites.
- the transmitting end 60 and the receiving end 70 are provided in multiplex radio apparatuses individually installed at the two sites described above.
- the transmitting end 60 is composed of the following elements.
- BRFIL -Planning filters
- the receiving part of the antenna 64 whose feeding point is connected to the fifth terminal of the hybrid 63 is composed of the following elements. • Antenna 7 1
- the transmitting end local sections 61-1 to 61-4 are modulated with transmission information to be transmitted in parallel via four individually corresponding channels.
- the first to fourth radio frequency signals adjacent to each other without occupied bands on the frequency axis are output.
- Each of the planting filters 6 2 -1 to 6 2 -4 has a passband shown in FIG. 6 (b), and passes signals other than the first to fourth radio frequency signals through these passbands. Remove.
- the hybrid 63 is transmitted by frequency-multiplexing the first to fourth signals provided in parallel under such filtering processing and adjacent on the frequency axis and having different occupied bands.
- a wave signal is generated, and the transmission wave signal is supplied to a feeding end of the antenna 64.
- the radio frequency signal radiated from the antenna 64 is simply referred to as a “radio frequency signal” below for simplicity.
- the antenna 71 receives the radio frequency signal arriving from the antenna 64 via the radio transmission path formed between the antenna 71 and the antenna 72, and switches the hybrid 72 These radio frequency signals are distributed in parallel with the planting filter 73-1 to 73-4.
- the planning fills 7 3 -1 to 7 3 -4 correspond to the planning fills 6 2-; It has the same passband as the passband of ⁇ 62-4. Further, the launching filter 73-1 to 73-4 demultiplexes the radio frequency signal by performing the above-described filtering process in parallel with the radio frequency signal distributed in this way, The first to fourth radio frequency signals frequency-multiplexed with the radio frequency signal are extracted in parallel. The receiving terminal units 74-1 to 74-4 transmit the extracted first to fourth radio frequency signals to the transmitting terminal units 61-1 to 61-4 provided at the transmitting terminal 60. , The transmission information transmitted in parallel via the above-described four channels is restored.
- a communication link having a desired degree of multiplexing is formed between the sites where the transmitting end 60 and the receiving end 70 are installed, based on the frequency multiplexing method.
- the higher the frequency band the higher the ratio of the width of the passband of the planting filter 6 2 -1 to 6 2 -4 and 7 3-1 to 7 3 -4 to the carrier frequency (hereinafter, the “fraction band”). ) Is big.
- the circuit scale and cost have increased, and furthermore, there have been restrictions on mounting and the like, and it has been difficult to realize it easily.
- the above-described wireless transmission path in a high frequency band equal to or higher than the quasi-millimeter wave band is formed by, for example, as shown in FIG. 7, a filter having a passband in all four occupied bands is a planting filter. -1 to 6 2 -4, 7 3-;! To 7 3 -4.
- the branching filter provided at the receiving end 70 is provided.
- Automatic gain control performed by one of 73-1 to 73-4 and the receiving terminal unit 741-1 to 74-4 (Performed for the purpose of compressing fluctuations and deviations of these levels.) Is based on the sum of these levels.
- the services to be provided to mobile communication network subscribers are rapidly expanding not only to telecommunications services but also to broadband communications services with the commercialization of the wideband CDMA system. It is being expanded to.
- An object of the present invention is to provide a radio receiver capable of achieving multiplex transmission with a desired large multiplicity in a high frequency band equal to or higher than the quasi-millimeter wave band with a good transmission quality without significantly changing the configuration. It is in.
- a further object of the present invention is to maintain high transmission quality and to enable flexible adaptation to various profiles of wireless transmission paths and zones.
- a further object of the present invention is to reduce the level difference between individual signals multiplexed with the input signal without unnecessary distortion and to convert the signal into a desired intermediate frequency signal.
- Another object of the present invention is to ensure a high degree of freedom in level diagram and gain distribution without excessively lowering the SN ratio and transmission quality. Furthermore, an object of the present invention is to provide a method in which the "frequency at which the gain of the frequency conversion means should be updated" is close to the "period of a symbol individually given in each signal multiplexed to the input signal". Even so, the SN ratio and transmission quality are maintained at a high level.
- the above-described object is to provide a feature that the level is the maximum among the plurality of n first output signals generated by individually frequency-converting the plurality of frequency-multiplexed n signals.
- a radio receiver characterized in that a constant output signal is selected and the gain of these means for performing frequency conversion is maintained in parallel to a value that reduces the level deviation of that particular output signal. Achieved.
- the above-mentioned plurality of n signals are individually transmitted even if there is a level difference due to a transmission path, a transmitting end and other characteristics, or a change in these characteristics.
- the frequency is converted and given as an intermediate frequency signal of almost the same level under automatic gain control performed based on the maximum level of these signals, and is subjected to demodulation (detection). .
- the input / output characteristics of the above-described frequency conversion means are as long as a suitable level diagram adapted to the standard level to which the plurality of n signals are to be input is established. , Are kept linear.
- the above-described object is to provide a specific output signal having the maximum transmission quality among the levels of the plurality of n first output signals generated by individually frequency-converting the frequency-multiplexed plurality of II signals.
- a signal level is selected, and the difference between the level and the maximum level of the above-mentioned plurality of n signals, which can be regarded as linear in all input / output characteristics of the means for individually performing the frequency conversion, is compressed. This is achieved by a radio receiver characterized in that the gains of these means are maintained in parallel to a certain value.
- the plurality of n signals described above are transmitted even when there is a difference in level or transmission quality due to transmission path, transmission end and other characteristics, or variations in these characteristics.
- the frequency conversion is performed individually and in parallel.
- the input / output characteristics of the above-described frequency conversion means are as long as a suitable level diagram adapted to the standard level to which the plurality of n signals are to be input is established. , Are kept linear.
- the above-mentioned plural n signals are different in a high frequency band above the quasi-millimeter wave band. Even if given at a certain level, in the process of frequency conversion described above, the fractional bandwidth of each of the plurality of n signals occupied by each of the signals becomes small flexibly and stably.
- the above-described object is to provide a second output signal corresponding to the first output signals by individually suppressing the level fluctuation of the plurality of n first output signals described above, When the level of these second output signals falls below the prescribed lower limit, the gain is maintained at a value that reduces the deviation of the level of the corresponding second output signal. Achieved.
- the gain of the means for generating the first signal corresponding to the second output signal is the level of the other first signal. Irrespective of the above, the value is locally maintained at “a value at which the deviation of the second output signal is suppressed”.
- the above-mentioned object is achieved by individually suppressing variations in the levels of the plurality of n first output signals described above to generate second output signals corresponding to these first output signals.
- the level of the second output signal is below a specified lower limit, the level of the corresponding second output signal and the plurality of input / output characteristics of which all the input / output characteristics of the means for performing frequency conversion can be regarded as linear.
- the difference from the maximum level of the n signal is achieved by a radio receiver characterized in that the gain is maintained at a value that is compressed.
- the gain of the means for generating the first signal corresponding to the second output signal is the level of the other first signal. Irrespective of the above, the value is maintained at “a value at which the deviation of the second output signal is suppressed”.
- the above-described object is to provide a second output signal corresponding to the first output signals by individually suppressing the level fluctuation of the plurality of n first output signals described above, The value by which the deviation of the level of the corresponding second output signal is reduced when the deviation of the specific output signal level exceeds a prescribed threshold value and the level of these second output signals falls below a prescribed lower limit value.
- a radio receiver characterized by the fact that the gain is maintained.
- the first output signal corresponding to the second output signal is only provided when the deviation of the specific output signal level described above exceeds a specified threshold value and the second output signal is extremely small.
- the gain of the means that generated the signal is maintained at "a value at which the deviation of the second output signal is suppressed" regardless of the level of the other first signal.
- the above-mentioned object is achieved by separately suppressing the level fluctuation of the plurality of n first output signals described above to generate second output signals corresponding to these first output signals.
- the corresponding level of the second output signal is subjected to frequency conversion.
- a radio receiver characterized in that the gain is maintained at a value where the difference between the maximum level of these multiple signals and the input / output characteristics of all means that can be regarded as linear is compressed. .
- the gain of the means for generating the first signal corresponding to the second output signal is the level of the other first signal. Irrespective of the above, the value is maintained at “a value at which the deviation of the second output signal is suppressed”.
- the above-mentioned object is achieved by a radio receiver characterized in that the gain is varied within a limit in which the reduction of the SN ratio of the plurality of n first output signals is allowed.
- the above-mentioned object is achieved by a radio receiver characterized in that the gain is variable as long as a desired noise figure is secured.
- the gain of the means for performing frequency conversion can be improved. Is updated to the extent that the above-mentioned noise figure is comprehensively maintained. Further, the above-mentioned object is achieved by a radio receiver characterized in that the gain is updated in synchronization with a sequence of symbols individually indicated by the aforementioned plurality of n signals.
- the gain of the means for performing the above-described frequency conversion is updated at a prescribed point in time synchronized with each signal point to be determined in a signal determination process performed in a stage subsequent to these means.
- FIG. 1 is a principle block diagram of a wireless receiver according to the present invention.
- FIG. 2 is a diagram showing first, second and fourth embodiments of the present invention.
- FIG. 3 is a diagram illustrating the operation of the first embodiment of the present invention.
- FIG. 4 is a diagram showing a third embodiment of the present invention.
- FIG. 5 is a diagram illustrating a configuration example of a multiplex radio apparatus applied to the construction of an access system.
- FIG. 6 is a diagram illustrating an operation of a conventional example.
- FIG. 7 is a diagram (1) for explaining the problem of the conventional example.
- FIG. 8 is a diagram (2) for explaining the problem of the conventional example. ⁇ Easy to bear skewers
- FIG. 1 is a principle block diagram of a wireless receiver according to the present invention.
- the radio receiver shown in FIG. 1 has frequency conversion means 11-1 to 1 l-n, selection means 12 and 12A gain control means 13-1 to 13-n, 13Al to 13 An And level fluctuation suppressing means 14-1 to 14-n.
- the principle of the first wireless receiver according to the present invention is as follows.
- the plurality n of frequency conversion means 11 1 -1 to 11 1 -n individually frequency-convert the plurality of frequency-multiplexed n signals, and output the plurality n of first output signals individually corresponding to these signals.
- Generate The selecting means 12 selects a specific output signal having the highest level among the plurality of n first output signals.
- the plurality of n gain control means 1 3 -1 to 1 3 -n are The gain of the plurality n of frequency conversion means 11-1 to 11-n is maintained in parallel with a value at which the level deviation of the specific output signal is compressed.
- the plurality of signals described above have a level difference due to the characteristics of the transmission path, the transmitting end, and any one of the above-described frequency conversion means 11-1 to 11-n, or fluctuations of these characteristics. Even if they occur, they are frequency-converted individually and in parallel, and given as intermediate frequency signals with almost the same level under automatic gain control performed based on the maximum level of these signals. And demodulation (detection).
- the input / output characteristics of the frequency conversion means 11-1 to 1 l -n are adjusted to a suitable level adapted to the standard level to which the plurality of n signals are to be inputted. As long as the diagram holds, both are kept linear.
- the occupied band is accurately and preserved under the filtering process through the pass band equal to the occupied band width, and the inter-channel interference is reliably and stably avoided.
- the principle of the second wireless receiver according to the present invention is as follows.
- the selecting means 12A selects the level of a specific signal having the highest transmission quality from among the plurality of levels of the first output signal.
- the plurality n of gain control means 1 3 A -1- 13 An include the level selected by the selection means 12 A and the plurality n of frequency conversion means 1 1 -1 to 1 1-of the plurality n signals. All of the n input / output characteristics can be considered to be linear. Maintain ⁇ 11-n gain separately.
- the plurality of n signals described above are caused by the characteristics of any one of the transmission path, the transmission end, and the frequency conversion means 11-1 to 11-n described above, or fluctuations of these characteristics. Even if there is a difference in level or transmission quality, automatic gain control is performed based on the level of the signal with the highest transmission quality, which is frequency-converted separately and in parallel. It is given as an intermediate frequency signal with almost the same level under and is subject to demodulation (detection).
- the input / output characteristics of the frequency conversion means 11-1 to 11-n are adjusted to a suitable level adapted to the standard level to which the plurality of II signals are to be inputted. As long as the diagram holds, both are kept linear.
- the occupied band is accurately and preserved under the filtering process through the pass band equal to the occupied band width, and the inter-channel interference is reliably and stably avoided.
- the principle of the third wireless receiver according to the present invention is as follows.
- the plurality of n level fluctuation suppressing means 14-:! to 14 -n individually suppress the level fluctuations of the plurality n of first output signals, and the second corresponding to these first output signals. Generate an output signal.
- the plurality n of gain control means 13 -1 to 13 -n have the level of the second output signal generated by the plurality II level fluctuation suppression means 14 -1 to 14 -n respectively. When the value falls below the prescribed lower limit, the deviation of the level of the second output signal in place of the level of the specific output signal is compressed to a value that reduces the number of the frequency conversion means 1 1 -1 to 11 1 -n. Maintain gains individually.
- the gain of the frequency conversion means that has generated the first signal is determined by the gain control means corresponding to the first signal (frequency conversion means) regardless of the level of the other first signal. Is maintained at a value at which the deviation of the output signal is suppressed.
- Transmission quality is maintained higher than in the case where variations in individual levels and differences are reduced or compressed under automatic gain control based on the maximum level. Flexible adaptation to different profiles is possible.
- the principle of the fourth radio receiver according to the present invention is as follows.
- the plurality of n level fluctuation suppressing means 14-:! to 14 -n individually suppress the level fluctuations of the plurality n of first output signals, and the second corresponding to these first output signals. Generate an output signal.
- Multiple n gain control means 1 3 A- :! ⁇ 13A- n are selected when the levels of the second output signals respectively generated by the plurality n of level fluctuation suppression means 14-1 ⁇ 14- n are below the prescribed lower limit.
- Means of the second output signal in place of the level selected by the means 12A, and all the inputs and outputs of the plurality n of the frequency conversion means 11 1 -1 to 11 1 -n among the plurality n of signals The gains of the plurality n of frequency conversion means 11 1 -1 to 11 1 -n are individually maintained at values at which the difference from the maximum level of the signal whose characteristics can be regarded as linear is compressed.
- the gain of the frequency conversion means that has generated the first signal to be converted is determined by the gain control means corresponding to the first signal (frequency conversion means) regardless of the level of the other first signal. Is maintained at a value at which the deviation of the output signal is suppressed.
- the principle of the fifth wireless receiver according to the present invention is as follows.
- the plurality of n level fluctuation suppressing means 14-:! to 14 -n individually suppress the level fluctuations of the plurality n of first output signals, and use the second corresponding to these first output signals. Generate output signal.
- the plurality n of gain control means 13-1 to 13 -n are determined by the deviation of the specific output signal level exceeding a specified threshold value and the plurality of n level fluctuation suppression means 14-1 to 14 -n
- the level of the generated second output signal is the specified lower limit When the value of the second output signal becomes smaller than the level of the second output signal instead of the level of this specific output signal, the plurality of n frequency conversion means 1 1-:! To be maintained individually.
- the level deviation of the specific output signal selected by the selection means 12 exceeds a prescribed threshold value, and the level fluctuation suppression means 14 4;
- the gain of the frequency conversion means that generated the corresponding first signal is Regardless of the signal level of the first signal, the gain control means corresponding to the first signal (frequency conversion means) maintains the value at which the deviation of the second output signal is suppressed.
- the principle of the sixth wireless receiver according to the present invention is as follows.
- the plurality n of level fluctuation suppressing means 14-1 to 14 -n individually suppress the level fluctuation of the plurality n of first output signals, and output second outputs corresponding to these first output signals. Generate a signal.
- Multiple n gain control means 1 3 A- :! An13 An are generated by the deviation of the level selected by the selection means 12 A exceeding the specified threshold value and by the plurality of n level fluctuation suppression means 14 -1 to 14 -n
- the level of the second output signal falls below the prescribed lower limit, the level of the second output signal is replaced with the level selected by the selection means 12A, and
- the plurality of n frequency conversion means 11 1-1 to 11 1 -n have all input / output characteristics that can be regarded as linear. Frequency conversion means 1 1-:! Maintain ⁇ 11-n gain separately.
- the deviation of the level of the specific output signal selected by the selection means 12 exceeds a prescribed threshold value, and the level deviation is suppressed under the automatic gain control performed by the level fluctuation suppression means 14-1 to 14-n. If the resulting second output signal is significantly smaller, the gain of the frequency conversion means that generated the corresponding first signal is independent of the level of the other first signal. Gain control means corresponding to (frequency conversion means) Thus, the value is maintained at a value at which the deviation of the second output signal is suppressed.
- the principle of the seventh wireless receiver according to the present invention is as follows.
- n gain control means 1 3-:! ⁇ 13-n means that the plurality of n frequency conversion means 1 1-:! Variable the gain of ⁇ 11-n.
- the frequency conversion means 11 1 -1 to 11 1 -n operates stably in the region where the input / output characteristics are linear.
- the plurality of n signals described above are converted into a desired intermediate frequency signal without unnecessary distortion and with a reduced level difference.
- the principle of the eighth wireless receiver according to the present invention is as follows.
- the plurality n of gain control means 13 A-l to l 3 A-n include the plurality n of frequency conversion means 11 A- :! as long as the reduction of the SN ratio of the plurality n of first output signals is allowed. ⁇ 1 1 Variable the gain of A-n.
- the frequency conversion means 11 A- :! ⁇ 1 ⁇ ⁇ - ⁇ operates stably in the region where the input / output characteristics are linear.
- the plurality of n signals described above are converted into a desired intermediate frequency signal without unnecessary distortion and with a reduced level difference.
- the principle of the ninth radio receiver according to the present invention is as follows.
- Multiple n gain control means 1 3-:! ⁇ 13-n is characterized in that the gain of a plurality of n frequency conversion means 11-:! ⁇ 11-n can be varied as long as a desired noise figure is secured. In other words, even if the level of any of the plurality of n signals becomes significantly smaller than the other signal levels for some reason, the gain of the frequency conversion means 11-1 to 11-n is The noise figure described above is updated to the extent that it is maintained overall.
- the frequency conversion means 11-1-1-11-n and the levels before and after the frequency conversion means 11-1 to 11-n The degree of freedom related to the diagram and the distribution of the gain is secured.
- the principle of a tenth wireless receiver according to the present invention is as follows.
- the plurality of n gain control means 13 to 13 3- ⁇ vary the gain of the plurality of ⁇ frequency conversion means 11 1 ⁇ -1 to 11 ⁇ - ⁇ within the limit that a desired noise figure is secured. That is, even if the level of any of the plurality of ⁇ signals becomes significantly larger than the other signal levels for some reason, the frequency conversion means 11 A -1 to 1 ⁇ ⁇ - ⁇ The gain is updated to the extent that the above-mentioned noise figure is maintained overall.
- the degree of freedom related to the level diagram and the distribution of gains in the project is secured.
- the principle of the eleventh radio receiver according to the present invention is as follows.
- the plurality of n gain control means 13-1 to 13 -n are synchronized with the sequence of symbols individually indicated by the plurality of n signals, and the plurality of n frequency conversion means 11 1-:! Update the gain of n.
- the gains of the plurality n of frequency conversion means 11-1 to 11-n should be determined in the process of signal determination performed at a stage subsequent to these frequency conversion means 11-1 to 11-n. It is updated at the specified time synchronized with each signal point.
- the principle of the twelfth radio receiver according to the present invention is as follows.
- the plurality of n gain control means 13 k- to 13 An synchronize with the sequence of symbols individually indicated by the plurality of n signals to obtain the gains of the plurality of n frequency conversion means 11 A-1 to 11 An. Update.
- the gain of the plurality n of frequency conversion means 11A-1 to 11An is determined for each signal point to be determined in the signal determination process performed in the subsequent stage of these frequency conversion means 11A-1 to 11An. It will be updated at the specified point in time.
- FIG. 2 is a diagram showing first, second and fourth embodiments of the present invention.
- This embodiment is characterized in that the receiving terminal units 20-1 to 20- shown in FIG. 2 are replaced with the planting files 73-1 to 73-4 and the receiving terminal units 74- :! to 74-4 shown in FIG. And a common unit 30 is provided.
- the receiving terminal unit 20-1 is composed of the following elements.
- AGC AGC section
- MIX frequency conversion section
- FIL channel filtering section
- Control unit 27-1 whose input is connected to the output of common unit 40 and whose output is connected to the control input of AGC unit 2 IP-1
- the AGC section 21 P-1 has a cascade-connected low noise amplifier (LNA) 41 Pl variable attenuation as shown in FIG. 3 with the suffixes “1” to “n” omitted. It is assumed that it is composed of an amplifier (VATT) 42 Pl, a low noise amplifier (LNA) 41 Sl, a variable attenuator (VATT) 42 S-1 and a low noise amplifier (LNA) 41T-1.
- LNA low noise amplifier
- the cascaded amplifier (AMP) 43 P-1 for the AGC section 21 S-1 Variable attenuator (VATT) 44P-1, Amplifier (AMP) 43 S-1, Variable attenuator (V ATT) 44 S-1, Amplifier (AMP) 43 Tl, Variable attenuator (VAT T) 44 T-1, It is assumed that it consists of a sound amplifier (AMP) 43Q-1, a variable attenuator (VATT) 44 Ql and an amplifier (AMP) 43Qui-l.
- the common unit 30 is configured such that the anodes are individually connected to the outputs of the detectors 26-1 to 26-4 provided in the receiving terminal units 20-1 to 20-4, respectively, and the power source is connected to these receiving terminal units. It is composed of four diodes 31-1 to 31-4 connected to the input of the control unit 27-1 provided in 20-1 to 20-4.
- FIG. 3 is a diagram illustrating the operation of the first embodiment of the present invention.
- the frequency conversion unit 22-c and the channel filtering unit 23-c are distributed via the hybrid 72 shown in FIG. 5, and are supplied via the AGC unit 21Pc. Is subjected to frequency conversion based on a method that satisfies the following condition, thereby generating an intermediate frequency signal.
- the passbands of the channel filtering units 23-c and 24-c are both set to the occupied band of the specific radio frequency signal described above.
- the AGC section 21 S-c is provided via the channel filtering sections 23-c and 24-c and has an intermediate frequency signal corresponding to the specific radio frequency signal described above (hereinafter referred to as a “specific intermediate frequency signal”). ) Is amplified and passed to the subsequent stage (where demodulation, signal judgment and other processing are performed.).
- the feedback control unit 25-c monitors the level of the specific intermediate frequency signal passed to the subsequent stage in this way, and sets the reference level set based on the specified level diagram and the level of the specific intermediate frequency signal.
- the gain of the AGC section 21 Sc described above is maintained at a value at which the difference from the above is compressed.
- the detector 26-c performs an envelope detection on the specific intermediate frequency signal obtained at the output end of the channel filtering section 23-c and smoothes the signal so as to be proportional to the level of the specific intermediate frequency signal.
- a monitor signal having a potential as an instantaneous value is generated.
- the diodes 31-1 to 31-4 provided in the common unit 30 are connected to the receiving terminal unit 20-; Detectors provided individually for ⁇ 20-4 26- ;! From the instantaneous values of the first to fourth monitor signals given in parallel as described above, the maximum instantaneous value is selected, and a feedback signal consisting of a sequence of these maximum instantaneous values is generated. I do.
- control unit 27-c compresses the difference between the standard value that should be taken by the above-mentioned instantaneous value and the above-mentioned instantaneous value of the feedback signal, based on the specified level diagram.
- the AGC unit 21 Pc gain is maintained at the value obtained.
- the total gain in the section from the input terminal of the AGC unit 21 IP-c arranged in the first stage to the input terminal of the AGC unit 21 Sc arranged in the last stage is Local 20- ;!
- the deviation of the largest of the different specific RF signal levels to be individually extracted by .about.20-4 and converted to a specific IF signal is maintained at a value that is compressed.
- the frequency of the radio frequency signal is a high frequency equal to or higher than the quasi-millimeter wave band, and the level of each radio frequency signal multiplexed with the radio frequency signal may be different or fluctuate.
- the solid line and dot As shown by the broken line and the broken line, each stage of the receiving end unit 20-1 to 20-4 is maintained in a linear region without changing the level diagram to an excessively small value, and the channel-to-channel Interference is accurately and stably avoided.
- the common unit 30 is configured without the diodes 31-1 to 31-4 described above.
- the feature of the present embodiment lies in the following processing procedure performed by the common unit 30 and the control unit 27-c provided in the reception terminal unit 20-c.
- the common unit 30 is provided for each of the signal points indicated by the first to fourth monitor signals provided in parallel by the detectors 26-1 to 26-4 in the same manner as described above. The average value of the error in the signal space under the arrangement is obtained.
- the common unit 30 determines the presence or absence of a monitor signal that satisfies the following condition among the first to fourth monitor signals. During a period when the determination is false, the common unit 30 In one embodiment, a feedback signal is generated by performing processing equivalent to the processing performed by the diodes 31-1 to 31-4.
- the receiving terminal units 20-1 to 20-4 have levels which are given in advance based on a prescribed level diagram and which belong to a dynamic range in which a desired SN ratio can be ensured in a linear region while operating.
- the common unit 30 selects a specific monitor signal having the maximum level from among the monitor signals satisfying these conditions, and selects the specific monitor signal.
- the feedback signal is generated as a sequence of the first value of the instantaneous value of the signal.
- the control unit 27-c should take the instantaneous value of the feedback signal during the period in which the result of the above-described determination is false, as in the first embodiment.
- the AGC unit 21 maintains the gain of the P-C to a value that compresses the difference between the standard value and the instantaneous value of the feedback signal.
- the control unit 2 7 -c is described above
- the gain of the AGC section 21 Pc is maintained at a value at which the difference between the upper limit of the dynamic range and the instantaneous value of the feedback signal is compressed.
- the total gain in the section from the input terminal of the AGC unit 2 IP-c located in the first stage to the input terminal of the AGC unit 21 Sc located in the last stage is 20-; Value extracted from individual specific RF signals to be converted to an intermediate frequency signal by! To 20-4, and the deviation from the level of the RF signal with the highest transmission quality is compressed. Is maintained.
- the control unit 27-c updates the gain of the AGC unit 21P-c without any synchronization with the above-described radio frequency signal and feedback signal.
- the present invention is not limited to such a configuration.
- the gain of the AGC unit 21 Pc is updated under symbol unit synchronization with the specific monitor signal selected by the sharing unit 30.
- unnecessary deterioration or reduction in transmission quality may be avoided.
- FIG. 4 is a diagram showing a third embodiment of the present invention.
- receiving terminal units 50-1 to 50-4 are provided instead of receiving terminal units 20-1 to 20-4 shown in FIG.
- the configuration of the receiving terminal unit 50-1 is such that a selection unit 51-1 is provided in front of the control unit 27-1 shown in FIG. 2, and the first to third inputs of the selection unit 51-1 are shared.
- the configuration is the same as that of the above-described reception terminal unit 20-1, except that the output of the unit 30, the feedback control unit 25-1, and the output of the detector 26-1 are connected.
- the selecting unit 51-c performs the following processing.
- the level L s is lower than the “predetermined lower limit based on the specified level diagram”.
- the selection unit 51-c selects the above-described feedback signal, and returns the feedback signal in the same manner as in the first or second embodiment described above. Signal is given to control unit 27-c.
- the selection unit 51-c selects the above-described monitor signal, and replaces the monitor signal with the feedback signal to the control unit 27-c. give.
- control unit 27-c is extracted by the AGC unit 2IP-c, the frequency conversion unit 22-c, and the channel filtering unit 23-c, and is converted into a “specific intermediate frequency signal”. If the level of the ⁇ specific radio frequency signal '' drops significantly to ⁇ a degree to which the result of the above-described determination becomes false '', the signal is output by the detector 26-c instead of the feedback signal output by the common unit 30. This level is greatly reduced or reduced based on the instantaneous value of the monitored signal.
- the receiving terminal units 50-1 to 50-4 individually demultiplex and frequency convert The first to fourth radio frequency signals to be processed are all received by the corresponding receiving terminal even if they are received at a significantly lower level than other radio frequency signals due to multipath or the like. As described above, in 50-c, the reduction in the level is reduced or compressed individually under the processing performed by the selection unit 51-c.
- Transmission quality is maintained higher than in the case where individual level fluctuations and differences are reduced or compressed under automatic gain control based on the maximum level, and the variety of wireless transmission paths and wireless zones is increased. Flexible adaptation to different profiles is possible.
- the selection unit 51-c is given to the control unit 27-c based on the result of determination as to whether or not both of the above-mentioned conditions (2) 1 and 2 are satisfied. Signal to be selected.
- the present invention is not limited to such a configuration.
- the above-described determination may be made under any of these conditions (2) 1 and 2 unless the above-described level diagram and other technical requirements are impaired.
- the configuration and the processing may be simplified by performing the processing based on only one of them.
- the selection unit 51-c selects only the above-described monitor signal as a signal provided to the control unit 27-c instead of the feedback signal.
- the present invention is not limited to such a configuration.
- the level of the intermediate frequency signal given to the subsequent stage of the AGC section 21 S-c by the 80 ⁇ section 21 3-(: is excessively reduced. If this is possible, the selector 51-c selects a signal to be given to the controller 27-c in place of the feedback signal by performing any of the following processing, and further stabilizes the transmission quality. May be ensured.
- level monitor signal a signal indicating the level monitored by the feedback control unit 25-c as an instantaneous value (hereinafter referred to as “level monitor signal”) is referred to in the above-described determination, The result is appropriately given to the control unit 27-c based on the result of the determination.
- control unit 27-c All or some of the following conditions are satisfied in the control unit 27-c, and the AGC unit 2 1
- the range of gain to be set to P-c (hereinafter referred to as “specified range”) is given as known information in advance.
- the degradation of the SN (CN) ratio of the radio frequency signals to be received via the receiving end stations 20-c, 50-c is kept to an acceptable limit.
- control unit 27-c is basically configured as described in any of the first to third above as A
- the gain of the GC section 21 Pc is set and updated as appropriate. If the new gain to be set in the AGC section 21 PC exceeds the range of the specified range described above, one of the following: Is performed.
- the gain with the smallest error for the new gain is set in the AGC section 21 P-c.
- the gain of the AGC unit 21 Pc is varied based on the feedback system.
- the present invention is not limited to such a configuration.
- the following gains are appropriately changed based on the feedforward method. Thereby, the level difference between channels may be compressed.
- variable gain amplifier added before the AGC section 21 S-1 or channel filtering section 24-c (If a variable attenuator is added instead of the variable amplifier, the attenuation of the variable attenuator It may be.)
- the frequency conversion unit 22-c performs frequency conversion twice, so that the passbands of the channel filtering units 23-c and 24-c fall within these occupied bandwidths.
- the fractional bandwidth of each channel is set to a value small enough to be set inexpensively and accurately in the same passband.
- the frequency conversion unit 22-c and the AGC unit The sum of the number of frequency conversions to be performed by and / or after the 2 1 S ⁇ c may be any value.
- the present invention can be similarly applied to a homodyne detection method (direct conversion method) or a triples single heterodyne method instead of the double superheterodyne method.
- the receiving terminal units 20-c and 50-c require that the occupied bands of the channels individually corresponding to the receiving terminal units 20-c and 50-c satisfy all of the following conditions. As described above, the processing described above is performed.
- the present invention is not limited to such channel configurations and frequency arrangements.
- the occupied bandwidth of the corresponding channel is It may be realized by calculating the above-mentioned level as the density (average value) of the power (frequency spectrum) in the system.
- the present invention is applied to the configuration of an access system using multiplex radio transmission in a radio frequency band equal to or higher than the quasi-millimeter wave band.
- the present invention is not limited to such an access system.
- a long-span communication link (access system) for multi-hop and frequency reuse in a quasi-millimeter wave band for the purpose of eliminating frequency shortage can be applied to the construction of
- the AGC section 21 P is assumed on the assumption that “the instantaneous values of the feedback signal, the monitor signal, and the level monitor signal are all proportional to the levels of the corresponding radio frequency signal and intermediate frequency signal”.
- the gain of -1 is set by the control unit 27-c and is updated as appropriate.
- the present invention is not limited to such a configuration.
- the conversion process satisfying the condition is as follows: It may be done in whole or in part.
- each of the receiving terminal units 20-c and 50-c and the common unit 30 is configured as dedicated hardware.
- software that realizes processing equivalent to the above-described processing is incorporated in all or some of the receiving terminal units 20-c and 50-c and / or the common unit 30. It may be configured as a general-purpose processor (or a DSP).
- the modulation schemes that can be applied in generating these radio frequency signals are phase It is not limited to the modulation method, and the deterioration of the transmission quality (signal point error) caused by updating the gain of 0 (part 21?) Is small enough to be acceptable, or the deterioration of the transmission quality is reduced.
- the distance between all signal points in the signal space and the origin of the signal space is common, such as QAM
- the present invention is not limited to the above-described embodiments, and various embodiments can be made within the scope of the present invention. Any or all of these may be modified in any way.
- the occupied bandwidth of the multiplexed individual signal is accurately preserved under a filtering process through a passband equal to the occupied bandwidth of the multiplexed signal, and Interference is accurately and stably avoided.
- the transmission quality is maintained high, and it is possible to flexibly adapt to various profiles of the radio transmission path and the radio zone.
- the multiplexed individual signals are converted into desired intermediate frequency signals while reducing the level difference without unnecessary distortion.
- the “gain of the means for performing frequency conversion is updated in the period of the symbol individually given by the multiplexed individual signal. Even if the power frequency should be close, the SN ratio and transmission quality are kept high.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004519179A JP3924300B2 (ja) | 2002-07-04 | 2002-07-04 | 無線受信機 |
EP02743830A EP1531565A4 (en) | 2002-07-04 | 2002-07-04 | RADIO RECEIVER |
PCT/JP2002/006788 WO2004006476A1 (ja) | 2002-07-04 | 2002-07-04 | 無線受信機 |
US11/028,794 US20050124308A1 (en) | 2002-07-04 | 2005-01-04 | Radio receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/006788 WO2004006476A1 (ja) | 2002-07-04 | 2002-07-04 | 無線受信機 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/028,794 Continuation US20050124308A1 (en) | 2002-07-04 | 2005-01-04 | Radio receiver |
Publications (1)
Publication Number | Publication Date |
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WO2004006476A1 true WO2004006476A1 (ja) | 2004-01-15 |
Family
ID=30022616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2002/006788 WO2004006476A1 (ja) | 2002-07-04 | 2002-07-04 | 無線受信機 |
Country Status (3)
Country | Link |
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EP (1) | EP1531565A4 (ja) |
JP (1) | JP3924300B2 (ja) |
WO (1) | WO2004006476A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012508494A (ja) * | 2008-11-07 | 2012-04-05 | エスティー‐エリクソン、ソシエテ、アノニム | 無線レシーバの利得を制御する方法および装置 |
Citations (3)
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JPH04352529A (ja) * | 1991-05-30 | 1992-12-07 | Nec Corp | 送信電力制御方式 |
JPH1174744A (ja) * | 1997-08-29 | 1999-03-16 | Fukushima Nippon Denki Kk | マルチキャリア自動利得制御装置 |
JP2000068957A (ja) * | 1998-08-19 | 2000-03-03 | Nec Corp | マルチキャリアの受信方法および無線通信装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2526609A1 (fr) * | 1982-05-04 | 1983-11-10 | Thomson Csf | Recepteur de signaux multiporteuses protege des signaux perturbateurs |
US5570350A (en) * | 1994-09-30 | 1996-10-29 | Lucent Technologies Inc. | CDMA cellular communications with multicarrier signal processing |
US5818299A (en) * | 1995-08-04 | 1998-10-06 | Compaq Computer Corporation | Power management in a computer |
KR100680075B1 (ko) * | 1999-09-13 | 2007-02-09 | 유티스타콤코리아 유한회사 | 코드 분할 다중 접속방식 이동통신 기지국 시스템의 무선주파수 수신장치에서 에프에이간 전력레벨 제어장치 |
-
2002
- 2002-07-04 EP EP02743830A patent/EP1531565A4/en not_active Withdrawn
- 2002-07-04 JP JP2004519179A patent/JP3924300B2/ja not_active Expired - Fee Related
- 2002-07-04 WO PCT/JP2002/006788 patent/WO2004006476A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04352529A (ja) * | 1991-05-30 | 1992-12-07 | Nec Corp | 送信電力制御方式 |
JPH1174744A (ja) * | 1997-08-29 | 1999-03-16 | Fukushima Nippon Denki Kk | マルチキャリア自動利得制御装置 |
JP2000068957A (ja) * | 1998-08-19 | 2000-03-03 | Nec Corp | マルチキャリアの受信方法および無線通信装置 |
Non-Patent Citations (1)
Title |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012508494A (ja) * | 2008-11-07 | 2012-04-05 | エスティー‐エリクソン、ソシエテ、アノニム | 無線レシーバの利得を制御する方法および装置 |
US8934584B2 (en) | 2008-11-07 | 2015-01-13 | Ericsson Modems Sa | Method and device to control the gain of a radio receiver |
US9461853B2 (en) | 2008-11-07 | 2016-10-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and device to control the gain of a radio receiver |
Also Published As
Publication number | Publication date |
---|---|
EP1531565A1 (en) | 2005-05-18 |
JPWO2004006476A1 (ja) | 2005-11-10 |
EP1531565A4 (en) | 2007-04-25 |
JP3924300B2 (ja) | 2007-06-06 |
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