JP2008177869A - Radio communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide radio communication equipment which can prevent erroneous signal detection due to burst noise thereby having improved performance of noise immunity. <P>SOLUTION: The radio communication equipment 150 which is adapted to a plurality of different modulation methods having different reference amplitude levels of baseband signals is provided with: an RF part 130 for amplifying a signal received through a receiving antenna; an adjusting amplitude level storing part 105 stored with an amplitude level to be referred to when adjusting the gain of the RF part 130; and an AGC part 101 using the amplitude level stored in the adjusting amplitude level storing part 105 in common for a plurality of modulation methods to adjust the gain of the RF part 130. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus that supports a plurality of modulation schemes, such as an IEEE 802.11b / g combo, and more particularly, to a wireless communication apparatus that supports a plurality of modulation schemes having different baseband signal reference amplitude levels.

  In recent years, there are wireless communication devices that support a plurality of modulation schemes having different reference amplitude levels of baseband signals. For example, there is a wireless communication device that supports an OFDM (Orthogonal Frequency Division Multiplex) method and a DSSS (Direct Sequence Spread Spectrum) method, such as an IEEE 802.11b / g combo chip.

  The preamble of the OFDM system used in IEEE (The Institute of Electrical and Electronics Engineers, Inc.) 802.11g is 8 μs long. Further, in the OFDM system, because of the peak problem, it is necessary to control the reference amplitude level of the baseband signal so as to converge to a relatively small amplitude level (see, for example, Non-Patent Document 1). On the other hand, the DSSS preamble used in IEEE 802.11b has a length of 144 μs or 72 μs. Further, in the DSSS system, the reference amplitude level of the baseband signal is controlled so that it converges to a very large amplitude level as compared with the OFDM system (see, for example, Non-Patent Document 2).

  FIG. 1 is a diagram illustrating the operation of a wireless communication device in the prior art. As shown in FIG. 1, in a conventional wireless communication device that supports communication in which the OFDM method and the DSSS method coexist, when starting reception of a wireless signal from the idle state (S11), first, instantaneous power is detected. A standby gain is set (S12). When instantaneous power equal to or greater than a predetermined threshold is detected (S13: Yes), the gain is adjusted at an amplitude level optimum for a signal modulated by the OFDM method (S14).

  Next, the wireless communication device detects a signal modulated by the OFDM method from the received signal using a method such as pattern matching (S15). At this time, if a signal modulated by the OFDM method is detected from the received signal (S15: Yes), then the received signal is demodulated based on the OFDM method (S16). If a signal modulated by the OFDM method is not detected from the received signal even after the predetermined time has elapsed (S17: Yes), the optimum amplitude level for the signal modulated by the DSSS method is detected. The gain is adjusted (S18).

Next, the wireless communication device detects a signal modulated by the DSSS method from the received signal using a method such as pattern matching (S19). At this time, when a signal modulated by the DSSS system is detected from the received signal (S19: Yes), the received signal is demodulated based on the DSSS system (S20). If a signal modulated by the DSSS method is not detected from the received signal even after the predetermined time has elapsed (S21), the process returns to the state of setting the standby gain (S12).
“IEEE Std 802.11g-2003 (Amendment to IEEE Std 802.11, 1999 Edition, as amed by by IEEE Stds 802.11a-1999, 802.11b-19991, 802.11b-1999 / Cor 80 11d-2001), IEEE Standard for Information technology -Telecommunications and Information exchangeWetresystems -Local and metropolitan. Control (MAC) and Physical Layer (PHY) specifications-Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band ", [online], June 27, Heisei, June 26, Hey. Day search], Internet <URL: http: //standards.ieee.org/getieee802/download/802.11g-2003.pdf> "IEEE Std 802.11b-1999, Supplement to IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band ", [online], 20 June 20, 2000, IEEE Computer Society, [December 26, 2006 search], Internet <URL: http: //standards.ieee.org/getieee802/download/802.11b-1999.pdf>

  However, if a signal modulated by the OFDM system comes after a while after the burst noise, there is a possibility that reception will fail. This detects instantaneous power when detecting a signal due to burst noise, and the radio communication device reception sequence transitions to a state in which the gain is adjusted at an optimum amplitude level for a signal modulated by the OFDM method. Transition to a state of detecting a signal modulated by. However, since a signal modulated by the OFDM method is not actually received, a time-out occurs, and a transition is made to a state in which the gain is adjusted at an optimum amplitude level for the signal modulated by the DSSS method, and the signal is modulated by the DSSS method. Transition to a state in which the detected signal is detected.

  If a radio signal modulated by the OFDM method is received during this sequence, reception of this radio signal fails. As described above, in the conventional reception sequence, there is a problem that noise resistance and sensitivity are poor because automatic gain control and pattern matching of both modulation methods are not always performed.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless communication device that can prevent erroneous signal detection due to burst noise and improve noise resistance performance.

  In order to achieve the above object, a wireless communication apparatus according to the present invention is (a) a wireless communication apparatus compatible with a plurality of modulation schemes having different reference amplitude levels of baseband signals, and (a1) via a receiving antenna. Amplifying means for amplifying the received signal; (a2) amplitude level storing means for storing an amplitude level referred to when adjusting the gain of the amplifying means; and (a3) storing in the amplitude level storing means. And an automatic gain control means for adjusting the gain of the amplifying means in common with the plurality of modulation schemes.

  As a result, the gain of the amplifying means is adjusted by sharing the amplitude level for a plurality of modulation schemes, so that the gain of the amplifying means can be constantly adjusted and the sensitivity point can be improved. In addition, since pattern matching of all modulation methods can be performed at all times, there is no failure in detection due to noise, and noise resistance can be improved.

  Note that the present invention may be realized not only as a wireless communication device but also as a baseband signal processing circuit mounted on the wireless communication device.

  According to the present invention, signal misdetection due to burst noise can be prevented, and noise resistance performance can be improved. Since automatic gain control is always performed, synchronization sensitivity can be improved. With a simple algorithm, the circuit scale can be reduced and the power consumption can be reduced.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment is (a) a wireless communication device that supports a plurality of modulation schemes having different reference amplitude levels of baseband signals, and (a1) amplifies a signal received via a receiving antenna. An amplification function; (a2) an amplitude level storage function that stores an amplitude level that is referred to when adjusting the gain of the amplification function; and (a3) an amplitude level that is stored in the amplitude level storage function. An automatic gain control function for adjusting the gain of the amplification function is provided in common with the modulation system.

  Based on the above points, the wireless communication device in the present embodiment will be described. Hereinafter, for the sake of brevity, it is assumed that the wireless communication apparatus in the present embodiment is compatible with IEEE802.11b / g.

First, the configuration of the wireless communication device in this embodiment will be described.
FIG. 2 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As illustrated in FIG. 2, the wireless communication device 150 includes a reception antenna 120, an RF (Radio Frequency) unit 130, and a baseband signal processing unit 100 as an example here.

  The RF unit 130 amplifies the signal received via the receiving antenna 120 so that the amplitude level can be converted from an analog signal to a digital signal. The signal obtained by amplification is output to the baseband signal processing unit 100. When the gain adjustment signal output from the baseband signal processing unit 100 is input, the received signal is amplified while adjusting the gain according to the input gain adjustment signal.

  The baseband signal processing unit 100 includes an AGC (Automatic Gain Control) unit 101, an OFDM (Orthogonal Frequency Division Multiplex) pattern matching unit 102, a DSSS (Direct Sequence Spread Spectrum) pattern matching unit 103, a control unit 104, and an adjustment amplitude. Level storage unit 105, selector 106, shared amplitude level generation unit 107, shared amplitude level storage unit 108, OFDM amplitude level storage unit 109, DSSS amplitude level storage unit 110, OFDM demodulation unit 111, DSSS demodulation unit 112 Prepare.

  When the signal output from the RF unit 130 is input, the AGC unit 101 calculates the average power of the input signal, and compares the calculation result with the adjustment amplitude level stored in the adjustment amplitude level storage unit 105. Meanwhile, the gain adjustment signal is output to the RF unit so that the amplitude level of the signal obtained by amplification by the RF unit 130 becomes the adjustment amplitude level.

  When the signal output from the RF unit 130 is input, the OFDM pattern matching unit 102 performs pattern matching processing based on the OFDM method on the input signal, and the signal is a signal modulated by the OFDM method. And the determination result is output to the control unit 104.

  When the signal output from the RF unit 130 is input, the DSSS pattern matching unit 103 performs pattern matching processing based on the DSSS system on the input signal, and the signal is a signal modulated by the DSSS system. And the determination result is output to the control unit 104.

  When the determination result output from the OFDM pattern matching unit 102 or the DSSS pattern matching unit 103 is input, the control unit 104 outputs a control signal to the shared amplitude level generation unit 107 or the selector 106 according to the input determination result. To do.

  For example, when a new shared amplitude level is generated according to the input determination result, the control unit 104 outputs a control signal for generating a shared amplitude level to the shared amplitude level generation unit 107.

  When the shared amplitude level storage unit 108 is selected as an input source, the control unit 104 outputs a control signal for selecting the shared amplitude level storage unit 108 as an input source to the selector 106. When selecting the OFDM amplitude level storage unit 109 as an input source, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106. When selecting the DSSS amplitude level storage unit 110 as an input source, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  The adjustment amplitude level storage unit 105 stores the amplitude level output from the selector 106 as an adjustment amplitude level. Here, the adjustment amplitude level is an amplitude level referred to by the AGC unit 101 when the gain of the RF unit 130 is adjusted.

  When the control signal output from the control unit 104 is input to the selector 106, the shared amplitude level storage unit 108, the OFDM amplitude level storage unit 109, and the DSSS amplitude level storage unit 110 are selected according to the input control signal. Select the input source. The amplitude level stored in the selected input source is output to the adjustment amplitude level storage unit 105.

  For example, when the input control signal is a control signal for selecting the shared amplitude level storage unit 108 as an input source, the selector 106 selects the shared amplitude level storage unit 108 as an input source. In the case of a control signal for selecting the OFDM amplitude level storage unit 109 as an input source, the OFDM amplitude level storage unit 109 is selected as an input source. In the case of a control signal for selecting the DSSS amplitude level storage unit 110 as an input source, the DSSS amplitude level storage unit 110 is selected as an input source.

  When the control signal output from the control unit 104 is input, the shared amplitude level generation unit 107 newly generates a shared amplitude level. The generated shared amplitude level is written into the shared amplitude level storage unit 108. Here, the shared amplitude level is an amplitude level shared for a plurality of modulation schemes when adjusting the gain of the RF unit 130.

  The shared amplitude level storage unit 108 stores the shared amplitude level generated by the shared amplitude level generation unit 107.

  The OFDM amplitude level storage unit 109 stores the OFDM amplitude level. Here, the OFDM amplitude level is an optimum amplitude level for a signal modulated by the OFDM method when adjusting the gain of the RF unit 130.

  The DSSS amplitude level storage unit 110 stores the DSSS amplitude level. Here, the DSSS amplitude level is an optimum amplitude level for a signal modulated by the DSSS method when the gain of the RF unit 130 is adjusted.

  The OFDM demodulator 111 demodulates the signal output from the RF unit 130 based on the OFDM scheme.

  The DSSS demodulator 112 demodulates the signal output from the RF unit 130 based on the DSSS scheme.

  In this embodiment, in order to simplify the story, the control unit 104 outputs a control signal for selecting the shared amplitude level storage unit 108 as an input source to the selector 106 regardless of the input determination result. Accordingly, the selector 106 selects the shared amplitude level storage unit 108 as an input source. The amplitude level stored in the selected shared amplitude level storage unit 108 is output to the adjustment amplitude level storage unit 105. The adjustment amplitude level storage unit 105 stores the amplitude level output from the selector 106, that is, the amplitude level stored in the shared amplitude level storage unit 108.

Next, the reception sequence of radio communication apparatus 150 in the present embodiment will be described.
FIG. 3 is a diagram showing a reception sequence of radio communication apparatus 150 in the present embodiment. As illustrated in FIG. 3, when the wireless communication device 150 starts reception from the idle state (S101), first, a gain adjustment signal is output from the AGC unit 101 to the RF unit 130. At this time, the AGC unit 101 adjusts the gain using the amplitude level stored in the adjustment amplitude level storage unit 105, that is, the shared amplitude level. Accordingly, the RF unit 130 amplifies the received signal while adjusting the gain so that the amplitude level of the signal received via the receiving antenna 120 becomes the common amplitude level. The signal obtained by amplification is output to the baseband signal processing unit 100 (S102).

  The wireless communication device 150 outputs a signal from the RF unit 130 to the OFDM pattern matching unit 102 and the DSSS pattern matching unit 103. Accordingly, the OFDM pattern matching unit 102 performs pattern matching processing based on the OFDM method on the signal output from the RF unit 130, and determines whether or not the signal is a signal modulated by the OFDM method. And the determination result is output to the control unit 104 (S103).

  Here, it is assumed that the wireless communication device 150 determines that the OFDM pattern matching unit 102 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the OFDM method. In this case, the OFDM demodulator 111 subsequently demodulates the signal output from the RF unit 130 based on the OFDM scheme (S104).

  Similarly, the DSSS pattern matching unit 103 performs pattern matching processing based on the DSSS system on the signal output from the RF unit 130, and determines whether the signal is a signal modulated by the DSSS system. The determination is made and the determination result is output to the control unit 104 (S105).

  Here, it is assumed that the wireless communication device 150 determines that the DSSS pattern matching unit 103 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the DSSS method. In this case, the DSSS demodulator 112 subsequently demodulates the signal output from the RF unit 130 based on the DSSS scheme (S106).

  Note that the wireless communication device 150, if either the OFDM pattern matching unit 102 or the DSSS pattern matching unit 103 cannot identify the modulation method of the signal output from the RF unit 130, the shared amplitude A transition is made to the level adjustment state (S102), and the gain is continuously adjusted.

  As described above, according to radio communication apparatus 150 in the present embodiment, the amplitude level is shared among a plurality of modulation schemes instead of adjusting the gain of RF section 130 using the optimum amplitude level for each modulation scheme. Then, the gain of the RF unit 130 is adjusted. Thereby, instead of adjusting the gain of the RF unit 130 after detecting the instantaneous power, the gain of the RF unit 130 can be constantly adjusted, and the sensitivity point can be improved. In addition, since pattern matching of all modulation methods can be performed at all times, there is no failure in detection due to noise, and noise resistance can be improved.

(Embodiment 2)
Hereinafter, a second embodiment according to the present invention will be described with reference to the drawings.

  The wireless communication device according to the present embodiment includes (b) and (b1) a modulation method determination function for determining whether or not a received signal is a signal modulated by a predetermined modulation method, and (b2) a modulation method determination function. If the received signal is a signal modulated by a predetermined modulation method, the optimal amplitude level for the predetermined modulation method is selected from a plurality of amplitude levels optimal for each modulation method. (B3) The automatic gain control function is characterized in that the gain of the amplification function is readjusted using the amplitude level selected by the amplitude level selection function.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 4 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 4, wireless communication device 250 is a baseband signal processing unit instead of baseband signal processing unit 100 as compared with wireless communication device 150 in the first embodiment (see, for example, FIG. 2). 200 is different.

The baseband signal processing unit 200 includes a control unit 204 instead of the control unit 104.
The control unit 204 receives the determination result output from the OFDM pattern matching unit 102. If the signal output from the RF unit 130 is a signal modulated by the OFDM method based on the input determination result, the control unit 204 performs OFDM pattern matching. It is assumed that the determination by the unit 102 is identified. In this case, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106.

  Similarly, the control unit 204 receives the determination result output from the DSSS pattern matching unit 103, and determines that the signal output from the RF unit 130 from the input determination result is a signal modulated by the DSSS method. It is assumed that the determination by the pattern matching unit 103 is identified. In this case, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  Next, the reception sequence of radio communication apparatus 250 in the present embodiment will be described. Note that the same processing steps as the processing steps in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a diagram showing a reception sequence of wireless communication device 250 in the present embodiment. As shown in FIG. 5, the wireless communication device 250 outputs a signal from the RF unit 130 to the OFDM pattern matching unit 102 and the DSSS pattern matching unit 103. Accordingly, the OFDM pattern matching unit 102 performs pattern matching processing based on the OFDM method on the signal output from the RF unit 130, and determines whether or not the signal is a signal modulated by the OFDM method. And the determination result is output to the control unit 204 (S103).

  Here, it is assumed that the radio communication device 250 determines that the OFDM pattern matching unit 102 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the OFDM method. In this case, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106. Accordingly, the amplitude level for OFDM is written in the adjustment amplitude level storage unit 105.

  Furthermore, the wireless communication device 250 outputs the gain adjustment signal from the AGC unit 101 to the RF unit 130 again. Accordingly, the RF unit 130 gains so that the amplitude level of the signal received via the receiving antenna 120 becomes the amplitude level stored in the adjustment amplitude level storage unit 105, that is, the OFDM amplitude level. Amplify while adjusting. The signal obtained by amplification is output to the baseband signal processing unit 200 (S201).

  Then, the demodulation unit 111 for OFDM demodulates the signal output from the RF unit 130 based on the OFDM scheme (S104).

  Similarly, the DSSS pattern matching unit 103 performs pattern matching processing based on the DSSS system on the signal output from the RF unit 130, and determines whether the signal is a signal modulated by the DSSS system. The determination is made, and the determination result is output to the control unit 204 (S105).

  Here, it is assumed that the wireless communication device 250 determines that the DSSS pattern matching unit 103 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the DSSS method. In this case, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106. Accordingly, the DSSS amplitude level is written in the adjustment amplitude level storage unit 105.

  Furthermore, the wireless communication device 250 outputs the gain adjustment signal from the AGC unit 101 to the RF unit 130 again. Accordingly, the RF unit 130 adjusts the gain so that the amplitude level of the signal received via the reception antenna 120 becomes the amplitude level stored in the adjustment amplitude level storage unit 105, that is, the DSSS amplitude level. Amplify while adjusting. The amplified signal is output to the baseband signal processing unit 200 (S202).

  Then, the DSSS demodulator 112 demodulates the signal output from the RF unit 130 based on the DSSS system (S106).

  As described above, according to radio communication apparatus 250 in the present embodiment, in the state where the gain is adjusted with the shared amplitude level (S102), RF unit 130 is used by using the amplitude level stored in shared amplitude level storage unit 108. Adjust the gain. If it is determined that the received signal is a signal modulated by the OFDM method in the state of detecting the signal pattern of the OFDM method (S103), the state transits to a state (S201) where the gain is readjusted with the amplitude level for OFDM. The gain of the RF unit 130 is readjusted using the amplitude level stored in the OFDM amplitude level storage unit 109.

  Similarly, when it is determined that the received signal is a signal modulated by the DSSS system in the state of detecting the DSSS signal pattern (S105), the gain is readjusted at the DSSS amplitude level (S202). And the gain of the RF unit 130 is readjusted using the amplitude level stored in the DSSS amplitude level storage unit 110.

  As described above, since the gain of the RF unit 130 can be readjusted using the optimum amplitude level for each modulation method, the communication accuracy can be further improved as compared with the wireless communication device 150 in the first embodiment. it can.

(Embodiment 3)
Embodiment 3 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment includes (c) (c1) a modulation method determination function for determining whether or not a received signal is a signal modulated by a predetermined modulation method, and (c2) a modulation method determination function. If the received signal is a signal modulated by a predetermined modulation method, the optimal amplitude level for the predetermined modulation method is selected from a plurality of amplitude levels optimal for each modulation method. (C3) The automatic gain control function calculates the difference between the amplitude level shared for a plurality of modulation schemes and the amplitude level selected by the amplitude level selection function, and the calculation result The gain of the amplification function is readjusted in consideration of the above.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 6 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 6, wireless communication device 350 is a baseband signal processing unit instead of baseband signal processing unit 100 as compared with wireless communication device 150 in the first embodiment (see, for example, FIG. 2). The difference is that 300 is provided.

  The baseband signal processing unit 300 includes an AGC unit 301 and a control unit 304 instead of the AGC unit 101 and the control unit 104.

  The AGC unit 301 reads the amplitude level from the adjustment amplitude level storage unit 105 when adjusting the gain with the OFDM amplitude level. Then, when adjusting the gain with the adjustment amplitude level, the amplitude level read from the adjustment amplitude level storage unit 105, that is, the amplitude level stored in the shared amplitude level storage unit 108, and the gain with the OFDM amplitude level are set. The difference between the amplitude level read from the adjustment amplitude level storage unit 105 when adjusting, that is, the amplitude level stored in the OFDM amplitude level storage unit 109 is calculated. The calculation result is added to a value for adjusting the gain of the RF unit 130. The gain of the RF unit 130 is readjusted using the value obtained by the addition.

  Similarly, the AGC unit 301 reads the amplitude level from the adjustment amplitude level storage unit 105 when adjusting the gain with the DSSS amplitude level. Then, when adjusting the gain with the adjustment amplitude level, the amplitude level read from the adjustment amplitude level storage unit 105, that is, the amplitude level stored in the shared amplitude level storage unit 108, and the gain with the DSSS amplitude level are set. The difference between the amplitude level read from the adjustment amplitude level storage unit 105 when adjusting, that is, the amplitude level stored in the DSSS amplitude level storage unit 110 is calculated. The calculation result is added to a value for adjusting the gain of the RF unit 130. The gain of the RF unit 130 is readjusted using the value obtained by the addition.

  The control unit 304 receives the determination result output from the OFDM pattern matching unit 102, and from the input determination result, if the signal output from the RF unit 130 is a signal modulated by the OFDM method, the pattern matching for OFDM is performed. It is assumed that the determination by the unit 102 is identified. In this case, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106.

  Similarly, the control unit 304 receives the determination result output from the DSSS pattern matching unit 103, and determines that the signal output from the RF unit 130 from the input determination result is a signal modulated by the DSSS method. It is assumed that the determination by the pattern matching unit 103 is identified. In this case, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  Next, the reception sequence of the wireless communication device in this embodiment will be described. Note that the same processing steps as the processing steps in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 7 is a diagram illustrating a reception sequence of the wireless communication device in the present embodiment. As shown in FIG. 7, the wireless communication device 350 outputs a signal from the RF unit 130 to the OFDM pattern matching unit 102 and the DSSS pattern matching unit 103. Accordingly, the OFDM pattern matching unit 102 performs pattern matching processing based on the OFDM method on the signal output from the RF unit 130, and determines whether or not the signal is a signal modulated by the OFDM method. And the determination result is output to the control unit 304 (S103).

  Here, it is assumed that the wireless communication device 350 determines that the OFDM pattern matching unit 102 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the OFDM method. In this case, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106. Accordingly, the amplitude level for OFDM is written in the adjustment amplitude level storage unit 105.

  Furthermore, the AGC unit 301 calculates the difference between the shared amplitude level and the OFDM amplitude level (S301). The calculation result is added to a value for adjusting the gain, and the gain of the RF unit 130 is readjusted using the value obtained by the addition (S302).

  Then, the demodulation unit 111 for OFDM demodulates the signal output from the RF unit 130 based on the OFDM scheme (S104).

  Similarly, the DSSS pattern matching unit 103 performs pattern matching processing based on the DSSS system on the signal output from the RF unit 130, and determines whether the signal is a signal modulated by the DSSS system. The determination is made and the determination result is output to the control unit 304 (S105).

  Here, it is assumed that the wireless communication device 350 determines that the DSSS pattern matching unit 103 determines that the signal output from the RF unit 130, that is, the received signal is a signal modulated by the DSSS method. In this case, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106. Accordingly, the DSSS amplitude level is written in the adjustment amplitude level storage unit 105.

  Furthermore, the AGC unit 301 calculates the difference between the shared amplitude level and the DSSS amplitude level (S303). The calculation result is added to the value for adjusting the gain, and the gain of the RF unit 130 is readjusted using the value obtained by the addition (S304).

  Then, the DSSS demodulator 112 demodulates the signal output from the RF unit 130 based on the DSSS system (S106).

  As described above, according to wireless communication device 350 in the present embodiment, it is possible to shorten the time until the gain of RF unit 130 is readjusted. More time can be spent in the process of demodulating the preamble, and communication accuracy can be improved.

(Embodiment 4)
Embodiment 4 according to the present invention will be described below with reference to the drawings.

  In the wireless communication apparatus according to the present embodiment, (d) among the plurality of amplitude levels optimum for each modulation scheme, the amplitude level optimum for the modulation scheme with the shortest preamble length is shared by the plurality of modulation schemes. It is characterized by an amplitude level.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 8 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 8, wireless communication device 450 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. 400 is different.

The baseband signal processing unit 400 includes a control unit 404 instead of the control unit 104.
When adjusting the gain with the shared amplitude level, the control unit 404 outputs, to the selector 106, a control signal for selecting an input source that stores an optimum amplitude level for the modulation scheme with the shortest preamble length. .

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when reception starts, the control unit 404 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. Accordingly, the selector 106 selects the OFDM amplitude level storage unit 109 as an input source. The amplitude level stored in the selected OFDM amplitude level storage unit 109 is output to the adjustment amplitude level storage unit 105.

  As described above, according to radio communication apparatus 450 in the present embodiment, for example, it is assumed that OFDM and DSSS are mixedly used as modulation schemes. In this case, the wireless communication device 450 sets the adjustment amplitude level to the OFDM amplitude level when starting to receive a wireless signal. This is because the preamble length of the OFDM method is shorter than that of the DSSS method. As a result, the step of readjusting the gain using the OFDM amplitude level can be omitted, more time can be taken for the process of demodulating the preamble, and communication accuracy can be improved.

(Embodiment 5)
Embodiment 5 according to the present invention will be described below with reference to the drawings.

  The radio communication apparatus according to the present embodiment is characterized in that (e) the largest amplitude level among a plurality of amplitude levels optimum for each modulation scheme is set as an amplitude level shared by the plurality of modulation schemes. To do.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 9 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 9, wireless communication device 550 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. 500 is different.

The baseband signal processing unit 500 includes a control unit 504 instead of the control unit 104.
When the control unit 504 starts receiving a signal, the control unit 504 selects, to the selector 106, a control signal that causes the selector 106 to select, as an input source, the one that stores the largest amplitude level among the amplitude levels optimized for each modulation method. Output.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the reception of the radio signal is started, the control unit 504 outputs a control signal for selecting the DSSS amplitude level storage unit 110 as an input source to the selector 106. Accordingly, the selector 106 selects the DSSS amplitude level storage unit 110 as an input source. The selected amplitude level stored in the DSSS amplitude level storage unit 110 is output to the adjustment amplitude level storage unit 105.

  As described above, according to radio communication apparatus 550 in the present embodiment, for example, when the OFDM scheme and the DSSS scheme are mixedly used as the modulation scheme, when starting reception of the radio signal, the amplitude for DSSS is used. Set the adjustment amplitude level to the level. This is because the DSSS amplitude level is larger than the OFDM amplitude level. As a result, by increasing the amplitude level, the signal-to-noise ratio of the signal output from the RF unit 130 can be improved, and the baseband signal processing can be performed with high bit accuracy, thereby further improving the communication accuracy. it can.

(Embodiment 6)
Embodiment 6 according to the present invention will be described below with reference to the drawings.

  The wireless communication apparatus according to the present embodiment has (f) (f1) an electric field level measurement function for measuring the electric field level of the received signal, and (f2) a measurement result obtained by measurement with the electric field level measurement function is a predetermined value. An amplitude level selection function that selects a large amplitude level from a plurality of optimal amplitude levels for each modulation method when the electric field level is smaller than the electric field level; f3) The amplitude level selected by the amplitude level selection function is an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 10 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 10, wireless communication device 650 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. The difference is that 600 is provided.

  The baseband signal processing unit 600 includes a control unit 604 instead of the control unit 104. An electric field level measurement unit 613 and an electric field level threshold storage unit 614 are newly provided.

  When adjusting the gain with the shared amplitude level, the control unit 604 reads the threshold value from the electric field level threshold value storage unit 614 when the measurement result output from the electric field level measurement unit 613 is input. The read threshold value is compared with the input measurement result. As a result of the comparison, when the measurement result is smaller than the threshold value, that is, when the electric field level of the signal output from the RF unit 130 is smaller than the threshold value, a control that selects a large amplitude level as an input source is selected. The signal is output to the selector 106. In other cases, a control signal for selecting an input source that stores a small amplitude level is output to the selector 106.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the electric field level of the signal output from the RF unit 130 is smaller than the threshold value, the control unit 604 outputs a control signal for selecting the DSSS amplitude level storage unit 110 as an input source to the selector 106. In other cases, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106. This is because the DSSS amplitude level is larger than the OFDM amplitude level.

  The electric field level measurement unit 613 receives the signal output from the RF unit 130 and measures the electric field level of the input signal when adjusting the gain with the shared amplitude level. The measurement result is output to the control unit 604.

The electric field level threshold storage unit 614 stores a predetermined electric field level as a threshold.
As described above, according to wireless communication device 650 in the present embodiment, when the gain is adjusted at the shared amplitude level, if the electric field level of the received signal is smaller than the threshold, the adjustment amplitude level is set to a large amplitude level. To do. In other cases, the adjustment amplitude level is set to a small amplitude level.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the electric field level of the signal output from the RF unit 130 is smaller than the threshold value, the wireless communication device 650 sets the adjustment amplitude level to the DSSS amplitude level. In other cases, the adjustment amplitude level is set to the OFDM amplitude level. In this way, by setting the adjustment amplitude level to a large amplitude level, it is possible to realize the demodulation processing for the baseband signal with high accuracy even if the signal with a small electric field level has a poor SN ratio. In addition, since the signal is a weak electric field, the time spent for setting the adjustment amplitude level is short, the time until readjustment of the gain is short, and it can be avoided that it causes deterioration of characteristics, and communication accuracy Can be further improved.

(Embodiment 7)
Embodiment 7 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment stores (g) (g1) a statistical information storage function that stores statistical information for specifying a modulation method of a signal received immediately before, and (g2) a statistical information storage function. Amplitude level selection that identifies the modulation method of the signal received immediately before based on the statistical information that has been selected, and selects the optimal amplitude level for the specified modulation method from among the multiple amplitude levels that are optimal for each modulation method (G3) The amplitude level selected by the amplitude level selection function is an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 11 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 11, wireless communication device 750 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. The difference is that 700 is provided.

  The baseband signal processing unit 700 includes a control unit 704, an OFDM demodulation unit 711, and a DSSS demodulation unit 712 instead of the control unit 104, the OFDM demodulation unit 111, and the DSSS demodulation unit 112. A statistical information management unit 713 and a statistical information storage unit 714 are newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 704 reads out statistical information indicating the modulation method of the signal received immediately before from the statistical information storage unit 714. Based on the read statistical information, the modulation scheme of the signal received immediately before is specified. A control signal is output to the selector 106 for selecting an input source that stores the optimum amplitude level for the specified modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation method is the OFDM method, the control unit 704 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  When the signal output from the RF unit 130 is input and the input signal is a signal modulated by the OFDM method, the OFDM demodulating unit 711 demodulates the input signal based on the OFDM method and notifies the reception completion Is output to the statistical information management unit 713.

  The DSSS demodulator 712 receives the signal output from the RF unit 130. When the input signal is a signal modulated by the DSSS system, the DSSS demodulator 712 demodulates the input signal based on the DSSS system and notifies the reception completion. Is output to the statistical information management unit 713.

  When receiving the reception completion notification from the OFDM demodulator 711, the statistical information manager 713 generates statistical information indicating that the received signal is a signal modulated by the OFDM method. The generated statistical information is written into the statistical information storage unit 714. In addition, when receiving a reception completion notification from the DSSS demodulator 712, it generates statistical information indicating that the received signal is a signal modulated by the DSSS method. The generated statistical information is written into the statistical information storage unit 714.

  The statistical information storage unit 714 stores statistical information that identifies the modulation method of the received signal.

  As described above, according to wireless communication device 750 in the present embodiment, the adjustment amplitude level is set to the optimum amplitude level for the modulation method of the signal received immediately before. In one-to-one communication between an AP (Access Point) and a STA (Station Terminal Adapter), the STA is likely to continue communication using the same modulation method. For this reason, there is a high possibility of selecting the optimum amplitude level for the modulation method of the signal received immediately before. As a result, a more likely amplitude level can be selected from a plurality of amplitude levels optimized for each modulation method with a simple configuration, and the communication system can be improved.

(Embodiment 8)
Embodiment 8 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment is stored in (h) (h1) statistical information storage function storing statistical information indicating the frequency of reception for each modulation method and (h2) statistical information storage function. An amplitude level selection function that identifies the modulation scheme having the highest frequency of reception based on the statistical information, and selects the optimum amplitude level for the identified modulation scheme from a plurality of amplitude levels optimum for each modulation scheme; (H3) The amplitude level selected by the amplitude level selection function is used as an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 12 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As illustrated in FIG. 12, the wireless communication device 850 is a baseband signal processing unit instead of the baseband signal processing unit 100 as compared to the wireless communication device 150 in the first embodiment (see, for example, FIG. 2). The difference is that 800 is provided.

  The baseband signal processing unit 800 includes a control unit 804, an OFDM demodulation unit 811, and a DSSS demodulation unit 812 instead of the control unit 104, OFDM demodulation unit 111, and DSSS demodulation unit 112. A statistical information management unit 813 and a statistical information storage unit 814 are newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 804 reads a plurality of statistical information associated with each modulation method from the statistical information storage unit 814. Based on the read statistical information, the modulation scheme having the highest received frequency is specified. A control signal is output to the selector 106 for selecting an input source that stores the optimum amplitude level for the specified modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation scheme is the OFDM scheme, the control unit 804 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  The OFDM demodulator 811 receives the signal output from the RF unit 130 and demodulates the input signal based on the OFDM method when the input signal is a signal modulated by the OFDM method. When a signal is received in packet units, a reception completion notification is sent to the statistical information management unit 813.

  When the signal output from the RF unit 130 is input to the DSSS demodulation unit 812 and the input signal is a signal modulated by the DSSS method, the DSSS demodulation unit 812 demodulates the input signal based on the DSSS method. When a signal is received in packet units, a reception completion notification is sent to the statistical information management unit 813.

  When receiving the reception completion notification from the OFDM demodulator 811, the statistical information management unit 813 updates the statistical information associated with the OFDM scheme from the statistical information stored in the statistical information storage unit 814. When receiving a reception completion notification from the DSSS demodulator 812, the statistical information associated with the DSSS scheme is updated from the statistical information stored in the statistical information storage unit 814.

  The statistical information storage unit 814 stores statistical information indicating the frequency of completion of reception for each modulation method.

  As described above, according to radio communication apparatus 850 in the present embodiment, the reception frequency is stored for each modulation scheme, and the adjustment amplitude level is set to the optimum amplitude level for the modulation scheme with a high reception frequency. This is because a radio communication device 850 that communicates with a large number of terminals such as an AP is likely to select an optimum amplitude level for a modulation scheme with a high reception frequency. As a result, a more likely amplitude level can be selected from a plurality of amplitude levels optimized for each modulation method with a simple configuration, and the communication system can be improved.

(Embodiment 9)
Embodiment 9 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment has (i) (i1) a statistical information storage function that stores statistical information indicating the frequency of successful reception for each modulation method, and (i2) a statistical information storage function that stores the statistical information. Amplitude that identifies the modulation method with the highest frequency of successful reception based on the statistical information that is selected, and selects the optimal amplitude level for the specified modulation method from among the multiple amplitude levels that are optimal for each modulation method And (i3) the amplitude level selected by the amplitude level selection function is an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 13 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As illustrated in FIG. 13, the wireless communication device 950 is different from the wireless communication device 150 according to the first embodiment (see, for example, FIG. 2) in place of the baseband signal processing unit 100. The difference is that 900 is provided.

  The baseband signal processing unit 900 includes a control unit 904, an OFDM demodulation unit 911, and a DSSS demodulation unit 912 instead of the control unit 104, the OFDM demodulation unit 111, and the DSSS demodulation unit 112. A statistical information management unit 913 and a statistical information storage unit 914 are newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 904 reads out statistical information indicating the frequency of successful reception from the statistical information storage unit 914. Based on the read statistical information, the modulation scheme with the highest frequency of successful reception is identified. A control signal is output to the selector 106 for selecting an input source that stores the optimum amplitude level for the specified modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation scheme is the OFDM scheme, the control unit 904 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  The OFDM demodulator 911 receives the signal output from the RF unit 130, and demodulates the input signal based on the OFDM method when the input signal is a signal modulated by the OFDM method. When a signal is received on a packet basis, the received packet is checked. If there is no abnormality in the checked packet as a result of the check, a notification of successful reception is sent to the statistical information management unit 913.

  The DSSS demodulator 912 receives the signal output from the RF unit 130 and demodulates the input signal based on the DSSS method when the input signal is a signal modulated by the DSSS method. When a signal is received on a packet basis, the received packet is checked. If there is no abnormality in the checked packet as a result of the check, a reception success notification is sent to the statistical information management unit 913.

  When the statistical information management unit 913 receives a notification of successful reception from the OFDM demodulating unit 911, the statistical information management unit 913 updates the statistical information associated with the OFDM scheme from the statistical information stored in the statistical information storage unit 914. When receiving a reception success notification from the DSSS demodulator 912, the statistical information associated with the DSSS scheme is updated from the statistical information stored in the statistical information storage unit 914.

  The statistical information storage unit 914 stores statistical information indicating the frequency of successful reception for each modulation method.

  As described above, according to the wireless communication device 950 in the present embodiment, the pass / fail judgment of communication is added, and the adjustment amplitude level is set to the optimum amplitude level for the modulation scheme with the highest frequency of successful reception. This makes it possible to select a more likely amplitude level from among a plurality of amplitude levels optimized for each modulation method.

(Embodiment 10)
Embodiment 10 according to the present invention will be described below with reference to the drawings.

  The wireless communication apparatus according to the present embodiment includes (j) (j1) a statistical information storage function that stores statistical information indicating the frequency of receiving retransmission frames for each modulation method, and (j2) a statistical information storage function. Based on the stored statistical information, the modulation scheme with the lowest reception frequency of retransmission frames is identified, and the optimum amplitude level for the identified modulation scheme is selected from among a plurality of amplitude levels optimum for each modulation scheme. And (j3) the amplitude level selected by the amplitude level selection function is an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 14 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As illustrated in FIG. 14, the wireless communication device 1050 is a baseband signal processing unit instead of the baseband signal processing unit 100 as compared to the wireless communication device 150 in the first embodiment (see, for example, FIG. 2). 1000 is different.

  The baseband signal processing unit 1000 includes a control unit 1004, an OFDM demodulation unit 1011, and a DSSS demodulation unit 1012 instead of the control unit 104, the OFDM demodulation unit 111, and the DSSS demodulation unit 112. A statistical information management unit 1013 and a statistical information storage unit 1014 are newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 1004 reads statistical information indicating the reception frequency of retransmission frames from the statistical information storage unit 1014. Based on the read statistical information, the modulation scheme with the lowest frequency of receiving retransmission frames is specified. A control signal is output to the selector 106 for selecting an input source that stores the optimum amplitude level for the specified modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation method is the OFDM method, the control unit 1004 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  The OFDM demodulator 1011 receives the signal output from the RF unit 130 and demodulates the input signal based on the OFDM method when the input signal is a signal modulated by the OFDM method. A frame is formed from the signal obtained by demodulation. It is determined whether the configured frame is a retransmission frame. If it is determined that the frame is a retransmission frame, a retransmission frame reception notification is sent to the statistical information management unit 1013.

  The DSSS demodulator 1012 receives the signal output from the RF unit 130 and demodulates the input signal based on the DSSS method when the input signal is a signal modulated by the DSSS method. A frame is formed from the signal obtained by demodulation. It is determined whether the configured frame is a retransmission frame. If it is determined that the frame is a retransmission frame, a retransmission frame reception notification is sent to the statistical information management unit 1013.

  When receiving the retransmission frame reception notification from the OFDM demodulator 1011, the statistical information management unit 1013 updates the statistical information associated with the OFDM scheme from the statistical information stored in the statistical information storage unit 1014. . In addition, when receiving a retransmission frame reception notification from the DSSS demodulator 1012, the statistical information associated with the DSSS scheme is updated from the statistical information stored in the statistical information storage unit 1014.

  The statistical information storage unit 1014 stores statistical information indicating the frequency of receiving retransmission frames for each modulation scheme.

  As described above, according to radio communication apparatus 1050 in the present embodiment, the adjustment amplitude level is set to the optimum amplitude level for the modulation scheme with the least reception frequency of retransmission frames due to frame reception failure or frame reception oversight. . As a result, an amplitude level having a higher possibility can be selected from a plurality of amplitude levels optimized for each modulation method, and communication accuracy can be improved.

(Embodiment 11)
Embodiment 11 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment includes (k) (k1) a bandwidth guaranteed rate information storage function that stores bandwidth guaranteed rate information indicating a bandwidth guaranteed rate set in the wireless communication device, and (k2) bandwidth. A modulation scheme correspondence table storage function storing a modulation scheme correspondence table in which an optimum modulation scheme is associated with a guaranteed rate, and a modulation scheme correspondence table stored in (k3) modulation scheme correspondence table storage function To identify the modulation scheme associated with the bandwidth guarantee rate information stored in the bandwidth guarantee rate information storage function, and select the optimum modulation level from the plurality of amplitude levels optimum for each modulation scheme. An amplitude level selection function for selecting an amplitude level, and (k4) an amplitude shared by the amplitude level selected by the amplitude level selection function for a plurality of modulation schemes Characterized by a bell.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 15 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 15, radio communication device 1150 is different from radio communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. The difference is that 1100 is provided.

  The baseband signal processing unit 1100 includes a control unit 1104 instead of the control unit 104. A band guarantee rate information storage unit 1113 and a modulation scheme correspondence table storage unit 1114 are newly provided.

  When adjusting the gain with the shared amplitude level, the control unit 1104 reads out the band guaranteed rate information indicating the band guaranteed rate set in the wireless communication device 1150 from the band guaranteed rate information storage unit 1113. A modulation scheme correspondence table in which an optimum modulation scheme is associated with the band guarantee rate is read from the modulation scheme correspondence table storage unit 1114. The modulation scheme associated with the read band guaranteed rate information is specified from the read modulation scheme correspondence table. A control signal that causes the input source to select the one that stores the optimum amplitude level for the specified modulation method is output to the selector 106.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation method is the OFDM method, the control unit 1104 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  The guaranteed bandwidth rate information storage unit 1113 stores guaranteed bandwidth rate information indicating the guaranteed bandwidth rate set in the wireless communication device 1150.

  The modulation scheme correspondence table storage unit 1114 stores a modulation scheme correspondence table in which an optimum modulation scheme is associated with the band guarantee rate.

  As described above, according to radio communication apparatus 1150 in the present embodiment, the modulation scheme of the received signal is inferred depending on whether radio communication apparatus 1150 performs band guarantee at a high rate, and the optimum amplitude for the analog modulation scheme Set the adjustment amplitude level to the level.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the wireless communication device 1150 performs bandwidth guarantee at a high rate of several tens of Mbps or more, the wireless communication device 1150 can be inferred that the OFDM method is used as the modulation method, and the adjustment amplitude is set to the OFDM amplitude level. Set the level. When the wireless communication device guarantees the band at a low rate of less than several tens of Mbps, it is assumed that the DSSS method is used as the modulation method, and the adjustment amplitude level is set to the DSSS amplitude level. As described above, the wireless communication device 1150 can appropriately set the adjustment amplitude level, and can improve the communication accuracy.

(Embodiment 12)
Embodiment 12 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment has (l) (l1) an S / N ratio measurement function for measuring the S / N ratio of a received signal, and (l 2) a measurement result obtained by measurement using the S / N ratio measurement function. When the signal-to-noise ratio is smaller than the signal-to-noise ratio, a large amplitude level is selected from a plurality of amplitude levels that are optimal for each modulation method. ) The amplitude level selected by the amplitude level selection function is an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 16 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 16, wireless communication device 1250 is different from wireless communication device 150 in Embodiment 1 in that baseband signal processing unit 1200 is provided instead of baseband signal processing unit 100.

  The baseband signal processing unit 1200 includes a control unit 1204 instead of the control unit 104. An SN ratio measuring unit 1213 and an SN ratio threshold storage unit 1214 are newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 1204 reads the threshold value from the SN ratio threshold value storage unit 1214 when the measurement result output from the SN ratio measurement unit 1213 is input. The read threshold value is compared with the input measurement result. As a result of comparison, if the measurement result is smaller than the threshold value, that is, if the signal-to-noise ratio of the signal output from the RF unit 130 is worse than the reference value, a control that selects a signal having a large amplitude level as an input source The signal is output to the selector 106. In other cases, a control signal for selecting an input source that stores a small amplitude level is output to the selector 106.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the measurement result is smaller than the threshold value, the control unit 1204 outputs a control signal for selecting the DSSS amplitude level storage unit 110 as an input source to the selector 106. In other cases, a control signal for selecting the OFDM amplitude level storage unit 109 as an input source is output to the selector 106.

  The SN ratio measuring unit 1213 measures the SN ratio of the signal output from the RF unit 130 when adjusting the gain at the shared amplitude level. The measurement result is output to the control unit 1204.

The SN ratio threshold storage unit 1214 stores a predetermined SN ratio as a threshold.
As described above, according to radio communication apparatus 1250 in the present embodiment, when the SN ratio of the signal output from RF section 130 is worse than the reference value, the adjustment amplitude level is set to a larger amplitude level. If the signal-to-noise ratio of the signal output from the RF unit 130 is better than the reference value, the adjustment amplitude level is set to a smaller amplitude level.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the S / N ratio of the received signal is worse than the threshold value, the wireless communication device 1250 adjusts the adjustment amplitude to a larger amplitude level such as the amplitude level optimized in the DSSS system in order to improve the S / N ratio. Set the level. On the other hand, if the S / N ratio of the received signal is better than the threshold value, the adjustment amplitude level is set to a smaller amplitude level like the OFDM amplitude level.

  As described above, the radio communication device 1250 sets the adjustment amplitude level to be high for a signal having a high possibility of reception failure, that is, a signal having a poor S / N ratio. As a result, the SN ratio can be improved and the communication performance can be improved.

(Embodiment 13)
Embodiment 13 according to the present invention will be described below with reference to the drawings.

  The wireless communication apparatus according to the present embodiment (m) (m1) demodulates received signals and calculates EVM (Error Vector Magnitude), and (m2) EVM calculated by the demodulation function is a predetermined EVM. An amplitude level generation function that generates an amplitude level increased by a predetermined level if larger, and an amplitude level generation function that generates an amplitude level decreased by a predetermined level otherwise; (m3) The generated amplitude level is an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 17 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As illustrated in FIG. 17, the wireless communication device 1350 is different from the wireless communication device 150 according to the first embodiment (for example, see FIG. 2) in place of the baseband signal processing unit 100. The difference is that 1300 is provided.

  The baseband signal processing unit 1300 includes a control unit 1304, a shared amplitude level generation unit 1307, and an OFDM demodulation unit 1311 instead of the control unit 104, the shared amplitude level generation unit 107, the OFDM demodulation unit 111, and the DSSS demodulation unit 112. , A DSSS demodulator 1312 is provided. An EVM (Error Vector Magnitude) storage unit 1313 and an EVM threshold storage unit 1314 are newly provided.

  The control unit 1304 reads the EVM from the EVM storage unit 1313 when adjusting the gain at the shared amplitude level. The threshold value is read from the EVM threshold value storage unit 1314. When the read EVM is larger than the read threshold value, a control signal for generating an amplitude level that is increased by a predetermined level from a predetermined amplitude level is output to the shared amplitude level generation unit 1307. Then, a control signal for selecting the shared amplitude level storage unit 108 as an input source is output to the selector 106.

  When the input control signal is a control signal for generating an amplitude level that is increased by a certain level from a predetermined amplitude level, the shared amplitude level generation unit 1307 has an amplitude level that is increased by a certain level from the predetermined amplitude level. Is generated. The generated amplitude level is written into the shared amplitude level storage unit 108.

  When the signal output from the RF unit 130 is input to the OFDM demodulator 1311 and the input signal is a signal modulated by the OFDM method, the OFDM demodulator 1311 demodulates the input signal based on the OFDM method. At this time, EVM is calculated. When a signal is received in packet units, the calculated EVM is written in the EVM storage unit 1313.

  When the signal output from the RF unit 130 is input to the DSSS demodulator 1312 and the input signal is a signal modulated by the DSSS system, the DSSS demodulator 1312 demodulates the input signal based on the DSSS system. At this time, EVM is calculated. When a signal is received in packet units, the calculated EVM is written in the EVM storage unit 1313.

  The EVM storage unit 1313 stores the EVM calculated by the OFDM demodulator 1311 and the EVM calculated by the DSSS demodulator 1312.

The EVM threshold storage unit 1314 stores a predetermined EVM as a threshold.
As described above, according to radio communication apparatus 1350 in the present embodiment, when the EVM of the received signal is larger than the reference value, the adjustment amplitude level is set to an amplitude level that is increased by a certain level from the predetermined amplitude level. As a result, the EVM specified from the signal received immediately before can be searched by following the optimum amplitude level, and the communication accuracy can be further improved.

(Embodiment 14)
Embodiment 14 according to the present invention will be described below with reference to the drawings.

  The wireless communication apparatus according to the present embodiment includes a gain correction table storage function that stores a gain correction table in which information for correcting the gain of the previous amplifier element unit included in the (n) (n1) amplification function is registered. And (n2) an amplitude level generation function for generating an amplitude level that increases the gain of the preamplifier element unit as much as possible based on the gain correction table stored in the gain correction table storage function, and (n3) amplitude level generation The amplitude level generated by the function is an amplitude level shared for a plurality of modulation schemes. The (n4) amplification function includes a front-stage amplifier element section that amplifies the received signal and a rear-stage amplifier element section that amplifies the signal obtained by amplification by the front-stage amplifier element section.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 18 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 18, wireless communication device 1450 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100 and RF unit 130. The difference is that a band signal processing unit 1400 and an RF unit 1430 are provided.

The RF unit 1430 includes a front-stage amplifier element part 1431 and a rear-stage amplifier element part 1431.
The baseband signal processing unit 1400 includes a control unit 1404 and a shared amplitude level generation unit 1407 instead of the control unit 104 and the shared amplitude level generation unit 107. A gain correction table storage unit 1413 is newly provided.

  When adjusting the gain with the shared amplitude level, the control unit 1404 outputs, to the shared amplitude level generating unit 1407, a control signal for generating an amplitude level that increases the gain of the preamplifier element unit 1431 as much as possible. Then, a control signal for selecting the shared amplitude level storage unit 108 as an input source is output to the selector 106.

  If the input control signal is a control signal that generates an amplitude level that increases the gain of the previous-stage amplifier element section 1431 as much as possible, the shared amplitude level generation section 1407 registers information for correcting the gain of the previous-stage amplifier element section 1431 The gain correction table thus read is read from the gain correction table storage unit 1413. Based on the read gain correction table, an amplitude level that increases the gain of the pre-amplifier element unit 1431 as much as possible is generated. The generated amplitude level is written into the shared amplitude level storage unit 108.

  The gain correction table storage unit 1413 stores a gain correction table in which information for correcting the gain of the pre-stage amplifier element unit 1431 is registered.

  As described above, according to radio communication apparatus 1450 in the present embodiment, the adjustment amplitude level is set to the amplitude level at which the gain of pre-amplifier element section 1431 is increased. This is because the signal-to-noise ratio of the signal output from the RF unit 130 becomes higher as the gain of the pre-amplifier element unit 1431 is higher. Therefore, by adjusting the adjustment amplitude level so that the gain of the pre-stage amplifier element unit 1431 can be set high, the SN ratio of the signal output from the RF unit 130 can be improved, and the communication accuracy can be improved. Can do.

(Embodiment 15)
Embodiment 15 according to the present invention will be described below with reference to the drawings.

  The wireless communication device according to the present embodiment has (o) (o1) a terminal configuration information storage function that stores terminal configuration information indicating a modulation scheme used in a terminal constituting a wireless network to which the wireless communication device belongs. (O2) Based on the terminal configuration information stored in the terminal configuration information storage function, the modulation scheme with the largest number of terminals in use is identified, and among the plurality of amplitude levels optimum for each modulation scheme And (o3) an amplitude level selected by the amplitude level selection function is used as an amplitude level shared by a plurality of modulation schemes. It is characterized by doing.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 19 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As illustrated in FIG. 19, the wireless communication device 1550 is different from the wireless communication device 150 in the first embodiment (see, for example, FIG. 2) in place of the baseband signal processing unit 100. The difference is that 1500 is provided.

  The baseband signal processing unit 1500 includes a control unit 1504, an OFDM demodulation unit 1511, and a DSSS demodulation unit 1512 instead of the control unit 104, the OFDM demodulation unit 111, and the DSSS demodulation unit 112. A terminal configuration information storage unit 1513 is newly provided.

  When adjusting the gain at the shared amplitude level, the control unit 1504 obtains terminal configuration information for identifying a modulation scheme used by a terminal constituting the wireless network to which the wireless communication device 1550 belongs from the terminal configuration information storage unit 1513. read out. Based on the read terminal configuration information, the most frequently used modulation scheme is identified. A control signal is output to the selector 106 for selecting an input source that stores the optimum amplitude level for the specified modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the specified modulation method is the OFDM method, the control unit 1504 outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When the specified modulation method is the DSSS method, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  When the signal output from the RF unit 130 is input to the OFDM demodulator 1511 and the input signal is a signal modulated by the OFDM method, the OFDM demodulator 1511 demodulates the input signal based on the OFDM method. A frame is formed from the signal obtained by demodulation. When the configured frame includes terminal configuration information transmitted from the parent terminal, the terminal configuration information is extracted from the configured frame, and the extracted terminal configuration information is written in the terminal configuration information storage unit 1513.

  The DSSS demodulator 1512 receives the signal output from the RF unit 130 and demodulates the input signal based on the DSSS method when the input signal is a signal modulated by the DSSS method. A frame is formed from the signal obtained by demodulation. When the configured frame includes terminal configuration information transmitted from the parent terminal, the terminal configuration information is extracted from the configured frame, and the extracted terminal configuration information is written in the terminal configuration information storage unit 1513.

  The terminal configuration information storage unit 1513 stores terminal configuration information for specifying a modulation scheme used in a terminal configuring a wireless network to which the wireless communication device 1550 belongs. The terminal configuration information is transmitted from the parent terminal in advance and stored in the terminal configuration information storage unit 1513.

  As described above, according to wireless communication device 1550 in the present embodiment, terminal configuration information is received in advance from the parent terminal of the wireless network to which wireless communication device 1550 belongs, and the adjustment amplitude level is set using the received terminal configuration information. To do.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, the wireless communication device 1550 adjusts the OFDM amplitude level to the OFDM amplitude level when it is determined from the terminal configuration information that the number of terminals using the OFDM scheme is the largest among the terminals configuring the wireless network to which the wireless communication device 1550 belongs. Set the amplitude level. On the other hand, when it is determined from the terminal configuration information that the number of terminals using the DSSS method is the largest, the adjustment amplitude level is set to the DSSS amplitude level. As described above, since there is a high possibility that the optimum amplitude level becomes the adjustment amplitude level in the modulation scheme used in the most terminals, communication accuracy can be improved.

(Embodiment 16)
Embodiment 16 according to the present invention will be described below with reference to the drawings.

  The radio communication apparatus according to the present embodiment is optimal for the modulation method having the shortest preamble length within the range of the amplitude level that can detect the signal of the sensitivity point by the modulation method having the largest optimum amplitude level (p). An amplitude level close to the amplitude level is used as an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 20 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As illustrated in FIG. 20, the wireless communication device 1650 is different from the wireless communication device 150 according to Embodiment 1 (see, for example, FIG. 2) in place of the baseband signal processing unit 100. The difference is that 1600 is provided.

  The baseband signal processing unit 1600 includes a shared amplitude level storage unit 1608 instead of the shared amplitude level storage unit 108.

  The shared amplitude level storage unit 1608 stores an amplitude level calculated at the time of reception trial in advance. In calculating the amplitude level, the range of the amplitude level in which the signal of the electric field level at the sensitivity point level can be normally received is specified. Within the specified range, an amplitude level close to the optimum amplitude level for the modulation scheme with the shortest preamble length is calculated.

  As described above, according to radio communication apparatus 1650 in the present embodiment, in the modulation scheme having the largest amplitude level, the preamble length is within the range of the amplitude level in which the signal of the electric field level at the sensitivity point level can be normally received. The adjustment amplitude level is set to an amplitude level close to the optimum amplitude level for the shortest modulation method.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, the wireless communication device identifies a range of amplitude levels in which a DSSS reception sensitivity point level signal can be received by the DSSS method. The adjustment amplitude level is set to an amplitude level closest to the OFDM amplitude level within the specified range. As a result, the adjustment amplitude level can be set to the optimum amplitude level for both the modulation method with the maximum amplitude level and the modulation method with the shortest preamble length, and communication accuracy can be improved.

(Embodiment 17)
Embodiment 17 according to the present invention will be described below with reference to the drawings.

  The radio communication apparatus according to the present embodiment is (q) the amplitude level obtained by adjusting the gain level of the amplification function so that the readjustment of the gain of the amplification function is completed in a short time from the optimum amplitude level for the modulation scheme with the shortest preamble length. Is an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 21 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As shown in FIG. 21, wireless communication device 1750 is different from wireless communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. 1700 is different.

  The baseband signal processing unit 1700 includes a shared amplitude level storage unit 1708 instead of the shared amplitude level storage unit 108.

  The shared amplitude level storage unit 1708 stores the amplitude level calculated at the time of reception trial in advance. In calculating the amplitude level, an amplitude level is calculated by adding an offset amount that can complete gain readjustment in a short time to an amplitude level optimum for the modulation method with the shortest preamble length.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, the shared amplitude level storage unit 1708 adds the offset level obtained so that gain readjustment can be completed in a short time to the amplitude level for OFDM with the shortest preamble length. I remember it.

  As described above, according to radio communication apparatus 1750 in the present embodiment, the amplitude obtained by adding the offset amount that can complete gain readjustment in a short time to the optimum amplitude level for the modulation scheme with the shortest preamble length Set the adjustment amplitude level to the level. As a result, the processing up to adjustment amplitude level adjustment, pattern detection, and gain readjustment can be completed in a short time, and the longest possible time can be allocated to the demodulation of the preamble, thereby improving the communication accuracy.

(Embodiment 18)
Hereinafter, an eighteenth embodiment according to the present invention will be described with reference to the drawings.

  The radio communication apparatus according to the present embodiment (r) uses an amplitude level obtained by adding a plurality of amplitude levels optimum for each modulation scheme at a certain ratio, and is used for the plurality of modulation schemes. It is characterized by.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 22 is a diagram illustrating a configuration of the wireless communication device according to the present embodiment. As illustrated in FIG. 22, the wireless communication device 1850 is a baseband signal processing unit instead of the baseband signal processing unit 100 as compared to the wireless communication device 150 in the first embodiment (see, for example, FIG. 2). The difference is that 1800 is provided.

  The baseband signal processing unit 1800 includes a shared amplitude level storage unit 1808 instead of the shared amplitude level storage unit 108.

  The shared amplitude level storage unit 1808 stores the amplitude level calculated at the time of reception trial in advance. In calculating the amplitude level, the amplitude level is calculated by adding the optimum amplitude levels of a plurality of modulation schemes by a certain ratio.

  As described above, according to the wireless communication device 1850 in the present embodiment, the algorithm for setting the adjustment amplitude level is the simplest, and the circuit configuration for realizing it can be realized most simply.

(Embodiment 19)
The nineteenth embodiment according to the present invention will be described below with reference to the drawings.

  In the wireless communication device according to the present embodiment, (s) (s1) the electric field level measurement function for measuring the electric field level of the received signal, and (s2) the measurement result obtained by the electric field level measurement function is a predetermined result. Amplitude that selects the optimal amplitude level for a given modulation method from among multiple amplitude levels that are optimal for each modulation method when the electric field level can be received only by a radio signal modulated by the modulation method And (s3) the amplitude level selected by the amplitude level selection function is an amplitude level shared for a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 23 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 23, the wireless communication device 1950 is different from the wireless communication device 150 in the first embodiment (see, for example, FIG. 2) in place of the baseband signal processing unit 100. 1900 is different.

  The baseband signal processing unit 1900 includes a control unit 1904 instead of the control unit 104. An electric field level measurement unit 1913 and an electric field level threshold storage unit 1914 are newly provided.

  When the control unit 1904 adjusts the gain at the common amplitude level, if the measurement result output from the electric field level measurement unit 1913 is input, the control unit 1904 can receive only a radio signal modulated by a predetermined modulation method. Is read out from the electric field level threshold value storage unit 1914. The read threshold value is compared with the input measurement result. As a result of comparison, when the measurement result is smaller than the threshold value, a control signal for selecting an input source that stores an amplitude level optimum for a predetermined modulation method is output to the selector 106.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, when the electric field level of the received signal is smaller than the electric field level at which only the radio signal modulated by the DSSS method can be received, the control unit 1904 selects the DSSS amplitude level storage unit 110 as an input source. Is output to the selector 106.

  The electric field level measurement unit 1913 receives the signal output from the RF unit 130 and adjusts the electric field level of the input signal when adjusting the gain with the shared amplitude level. The measurement result is output to the control unit 1904.

  The electric field level threshold storage unit 1914 stores an electric field level at which only a radio signal modulated by a predetermined modulation method can be received as a threshold.

  As described above, according to radio communication apparatus 1950 in the present embodiment, when the electric field level of the received signal can be demodulated only by a signal of a predetermined modulation method, the amplitude level is adjusted to an optimum amplitude level for the predetermined modulation method. Set the amplitude level.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, since the DSSS scheme can receive a weaker signal than the OFDM scheme, when the electric field level of the received signal is smaller than the electric field level at which only a radio signal modulated by the DSSS scheme can be received, the DSSS Set the adjustment amplitude level to the adjustment amplitude level. Thus, the adjustment amplitude level can be set without loss with a simple configuration, and communication accuracy can be improved.

(Embodiment 20)
Embodiment 20 according to the present invention will be described below with reference to the drawings.

  The radio communication apparatus according to the present embodiment has (t) (t1) an amplitude level selection function for selecting an amplitude level from among a plurality of amplitude levels optimum for each modulation method while switching a selection target at predetermined time intervals. (T2) The amplitude level selected by the amplitude level selection function is used as an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 24 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 24, the radio communication device 2050 is a baseband signal processing unit instead of the baseband signal processing unit 100 as compared to the radio communication device 150 in the first embodiment (see, for example, FIG. 2). The difference is that 2000 is provided.

  The baseband signal processing unit 2000 includes a control unit 2004 instead of the control unit 104.

  When adjusting the gain with the shared amplitude level, the control unit 2004 switches the stored amplitude level at a predetermined time interval, and outputs a control signal to the selector 106 for selecting the switched one as an input source.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, the control unit 2004 first outputs a control signal for selecting the OFDM amplitude level storage unit 109 as an input source to the selector 106. When a predetermined time elapses, a control signal for selecting the DSSS amplitude level storage unit 110 as an input source is output to the selector 106.

  As described above, according to radio communication apparatus 2050 in the present embodiment, the amplitude level is switched every time a predetermined time elapses, and the adjustment amplitude level is set to the switched amplitude level.

  For example, it is assumed that OFDM and DSSS are mixedly used as modulation methods. In this case, first, the adjustment amplitude level is set to the OFDM amplitude level. When a predetermined time elapses, the adjustment amplitude level is set to the DSSS amplitude level. In this way, by switching the amplitude level, it is possible to detect the pattern using the optimum amplitude level for each modulation method, and to improve the communication accuracy.

(Embodiment 21)
Embodiment 21 according to the present invention will be described below with reference to the drawings.

  The wireless communication apparatus according to the present embodiment includes (u) (u1) an amplitude level generation function for generating an amplitude level obtained by approximating the power level of 2 to a power of 2 from an optimal amplitude level for a predetermined modulation scheme. u2) The amplitude level generated by the amplitude level generation function is used as an amplitude level shared by a plurality of modulation schemes.

Based on the above points, the wireless communication device in the present embodiment will be described.
First, the configuration of the wireless communication device in this embodiment will be described. In addition, about the component same as the component in Embodiment 1, the same referential mark is attached | subjected and description is abbreviate | omitted.

  FIG. 25 is a diagram illustrating a configuration of a wireless communication device according to the present embodiment. As shown in FIG. 25, radio communication device 2150 is different from radio communication device 150 in Embodiment 1 (see, for example, FIG. 2) in place of baseband signal processing unit 100. The difference is that 2100 is provided.

  The baseband signal processing unit 2100 includes a control unit 2104 instead of the control unit 104. A shared amplitude level regeneration unit 2113 is newly provided.

  The control unit 2104 outputs a control signal for regenerating the shared amplitude level to the shared amplitude level regenerating unit 2113 when adjusting the gain with the shared amplitude level. Then, a control signal for selecting the shared amplitude level storage unit 108 as an input source is output to the selector 106.

  The shared amplitude level regeneration unit 2113 reads the amplitude level from the shared amplitude level storage unit 108 when the control signal output from the control unit 2104 is input when adjusting the gain with the shared amplitude level. The read amplitude level is approximated to a power of 2, and the amplitude level obtained by the approximation is written in the shared amplitude level storage unit 108.

  As described above, according to the wireless communication device in the present embodiment, when the shared amplitude level and the amplitude level used for gain readjustment are powers of 2, the correction of amplitude information is realized by bit shift. And the circuit scale can be reduced.

  This is because preamble amplitude information is required to demodulate each signal modulated by each modulation method, and therefore preamble amplitude information is acquired at the time of pattern detection. However, since the gain is readjusted after pattern detection, it is necessary to correct already acquired amplitude information.

(Other)
Note that the baseband signal processing units 100 to 2100 according to the first to twenty-first embodiments include a semi-custom LSI such as a full custom LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), It may be formed in a programmable logic device such as an FPGA (Field Programmable Gate Array) or CPLD (Complex Programmable Logic Device).

  The present invention relates to a wireless communication device such as an IEEE802.11b / g combo chip that is compatible with a plurality of modulation methods, particularly a wireless communication device that supports a plurality of modulation methods with different baseband signal reference amplitude levels. It can be used as such.

The figure which shows the reception sequence of the radio | wireless communication apparatus in a prior art The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 1 concerning this invention. The figure which shows the receiving sequence of the radio | wireless communication apparatus in Embodiment 1 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 2 concerning this invention. The figure which shows the receiving sequence of the radio | wireless communication apparatus in Embodiment 2 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 3 concerning this invention. The figure which shows the receiving sequence of the radio | wireless communication apparatus in Embodiment 3 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 4 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 5 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 6 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 7 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 8 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 9 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 10 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 11 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 12 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 13 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 14 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 15 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 16 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 17 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 18 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 19 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 20 concerning this invention. The figure which shows the structure of the radio | wireless communication apparatus in Embodiment 21 concerning this invention.

Explanation of symbols

100 to 2100 Baseband signal processing unit 101, 301 AGC unit 102 OFDM pattern matching unit 103 DSSS pattern matching unit 104 to 1504, 1904 to 2104 Control unit 105 Adjustment amplitude level storage unit 106 Selectors 107, 1307, 1407 Shared amplitude Level generation unit 108, 1608 to 1808 Common amplitude level storage unit 109 OFDM amplitude level storage unit 110 DSSS amplitude level storage unit 111, 711 to 1011 and 1311 OFDM demodulation unit 112, 712 to 1012 and 1312 DSSS demodulation unit 120 Reception antenna 130 RF unit 150-2150 Wireless communication device 613 Electric field level measurement unit 614 Electric field level threshold storage unit 713-1013 Statistical information management unit 714-1014 Statistical information storage unit 1113 Bandwidth guarantee Mode information storage unit 1114 Modulation method correspondence table storage unit 1213 SN ratio measurement unit 1214 SN ratio threshold storage unit 1313 EVM storage unit 1314 EVM threshold storage unit 1413 Gain correction table storage unit 1513 Terminal configuration information storage unit 1913 Electric field level measurement unit 1914 Electric field level threshold value storage unit 2113 shared amplitude level regeneration unit

Claims (22)

A wireless communication device corresponding to a plurality of modulation methods having different reference amplitude levels of a baseband signal,
Amplifying means for amplifying a signal received via the receiving antenna;
Amplitude level storage means for storing an amplitude level referred to when adjusting the gain of the amplification means;
An automatic gain control means for adjusting the gain of the amplifying means by sharing the amplitude level stored in the amplitude level storage means for the plurality of modulation schemes. The wireless communication device is
Modulation scheme determination means for determining whether or not the received signal is a signal modulated by a predetermined modulation scheme;
If the received signal is a signal modulated by a predetermined modulation method as a result of the determination by the modulation method determining means, the optimum modulation level is selected from among a plurality of amplitude levels that are optimal for each modulation method. An amplitude level selecting means for selecting an appropriate amplitude level,
The wireless communication apparatus according to claim 1, wherein the automatic gain control means readjusts the gain of the amplification means using the amplitude level selected by the amplitude level selection means. The wireless communication device is
Modulation scheme determination means for determining whether or not the received signal is a signal modulated by a predetermined modulation scheme;
If the received signal is a signal modulated by a predetermined modulation method as a result of the determination by the modulation method determining means, the optimum modulation level is selected from among a plurality of amplitude levels that are optimal for each modulation method. An amplitude level selecting means for selecting an appropriate amplitude level,
The automatic gain control means calculates the difference between the amplitude level shared for the plurality of modulation schemes and the amplitude level selected by the amplitude level selection means, and takes the calculation result into account, The wireless communication device according to claim 1, wherein the gain is readjusted. The automatic gain control means sets an optimum amplitude level for a modulation scheme having the shortest preamble length among a plurality of amplitude levels optimum for each modulation scheme as an amplitude level shared for the plurality of modulation schemes. The wireless communication device according to claim 1. The automatic gain control means sets the largest amplitude level among a plurality of amplitude levels optimum for each modulation scheme as an amplitude level shared for the plurality of modulation schemes. The wireless communication device described. The wireless communication device is
Electric field level measuring means for measuring the electric field level of the received signal;
When the measurement result obtained by the electric field level measurement means is smaller than the predetermined electric field level, select a large amplitude level from among the plurality of amplitude levels optimal for each modulation method, and otherwise Comprises an amplitude level selection means for selecting a small amplitude level,
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Statistical information storage means for storing statistical information for identifying the modulation method of the signal received immediately before;
Based on the statistical information stored in the statistical information storage means, the modulation scheme of the signal received immediately before is identified, and the optimum amplitude for the identified modulation scheme is selected from among the plurality of amplitude levels optimum for each modulation scheme. Amplitude level selecting means for selecting the level, and
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Statistical information storage means storing statistical information indicating the frequency of reception for each modulation method;
Based on the statistical information stored in the statistical information storage means, the modulation scheme having the highest frequency of reception is identified, and the optimum amplitude for the identified modulation scheme is selected from among a plurality of amplitude levels optimum for each modulation scheme. Amplitude level selecting means for selecting the level, and
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Statistical information storage means storing statistical information indicating the frequency of successful reception for each modulation method;
Based on the statistical information stored in the statistical information storage means, the modulation scheme that is most frequently received successfully is identified, and the optimum modulation scheme is selected from among a plurality of amplitude levels that are optimal for each modulation scheme. An amplitude level selecting means for selecting an appropriate amplitude level,
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Statistical information storage means for storing, for each modulation method, statistical information indicating the frequency of reception of retransmission frames;
Based on the statistical information stored in the statistical information storage means, the modulation scheme with the lowest reception frequency of retransmission frames is identified, and the optimum modulation scheme is selected from among a plurality of amplitude levels that are optimal for each modulation scheme. An amplitude level selecting means for selecting an appropriate amplitude level,
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Bandwidth guarantee rate information storage means for storing bandwidth guarantee rate information indicating the bandwidth guarantee rate set in the wireless communication device;
A modulation method correspondence table storage means for storing a modulation method correspondence table in which an optimum modulation method is associated with the guaranteed bandwidth rate;
From the modulation scheme correspondence table stored in the modulation scheme correspondence table storage means, the modulation scheme associated with the band guarantee rate information stored in the band guarantee rate information storage means is specified, and each modulation scheme is assigned to each modulation scheme. Amplitude level selection means for selecting the optimum amplitude level for the specified modulation method from among a plurality of optimum amplitude levels, and
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
SN ratio measuring means for measuring the SN ratio of the received signal;
When the measurement result obtained by the signal-to-noise ratio measurement means is smaller than a predetermined signal-to-noise ratio, a large amplitude level is selected from a plurality of amplitude levels that are optimal for each modulation method, and otherwise. And an amplitude level selection means for selecting a small amplitude level,
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device is
Demodulation means for demodulating the received signal and calculating EVM (Error Vector Magnitude);
When the EVM calculated by the demodulating means is larger than a predetermined EVM, an amplitude level generating means for generating an amplitude level increased by a predetermined level, and otherwise, an amplitude level generating means for generating an amplitude level reduced by a predetermined level And
The wireless communication apparatus according to claim 1, wherein the automatic gain control means uses the amplitude level generated by the amplitude level generation means as an amplitude level shared for the plurality of modulation schemes. The amplification means includes
A pre-amplifier element for amplifying the received signal;
A post-stage amplifier element section that amplifies the signal obtained by amplification by the front-stage amplifier element section,
The wireless communication device is
Gain correction table storage means for storing a gain correction table in which information for correcting the gain of the preceding amplifier element unit is registered;
Based on a gain correction table stored in the gain correction table storage means, an amplitude level generation means for generating an amplitude level for increasing the gain of the pre-stage amplifier element unit as much as possible, and
The wireless communication apparatus according to claim 1, wherein the automatic gain control means uses the amplitude level generated by the amplitude level generation means as an amplitude level shared for the plurality of modulation schemes. The wireless communication device is
Terminal configuration information storage means for storing terminal configuration information indicating a modulation scheme used in a terminal constituting a wireless network to which the wireless communication device belongs;
Based on the terminal configuration information stored in the terminal configuration information storage means, the modulation scheme that has the largest number of terminals in use is identified, and is identified from among a plurality of optimum amplitude levels for each modulation scheme. Amplitude level selection means for selecting the optimum amplitude level for the modulation method, and
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The automatic gain control means has an amplitude level close to the optimum amplitude level for the modulation method with the shortest preamble length within the amplitude level range in which the signal at the sensitivity point can be detected by the modulation method with the largest optimum amplitude level. The wireless communication device according to claim 1, wherein the amplitude level is shared by the plurality of modulation schemes. The automatic gain control means adjusts the amplitude level obtained by adjusting the gain readjustment of the amplifying means so that the readjustment of the gain of the amplification means is completed in a short time from the optimum amplitude level for the modulation method with the shortest preamble length. The wireless communication device according to claim 1, wherein the amplitude level is shared by the modulation method. The automatic gain control means sets an amplitude level obtained by adding a plurality of optimum amplitude levels for each modulation method at a certain ratio as an amplitude level shared by the plurality of modulation methods. The wireless communication device according to claim 1. The wireless communication device is
Electric field level measuring means for measuring the electric field level of the received signal;
When the measurement result obtained by the measurement by the electric field level measurement means is lower than the electric field level that can be received only by a radio signal modulated by a predetermined modulation method, a plurality of optimum amplitude levels for each modulation method An amplitude level selecting means for selecting an optimum amplitude level for the predetermined modulation method,
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device includes amplitude level selection means for selecting an amplitude level from a plurality of amplitude levels optimal for each modulation method while switching a target to be selected at a predetermined time interval.
The wireless communication device according to claim 1, wherein the automatic gain control means uses the amplitude level selected by the amplitude level selection means as an amplitude level shared by the plurality of modulation schemes. The wireless communication device includes an amplitude level generation unit that generates an amplitude level obtained by approximating the power level of 2 from an amplitude level optimal for a predetermined modulation method,
The wireless communication apparatus according to claim 1, wherein the automatic gain control means uses the amplitude level generated by the amplitude level generation means as an amplitude level shared for the plurality of modulation schemes. A baseband signal processing circuit corresponding to a plurality of modulation methods having different reference amplitude levels of a baseband signal,
Amplitude level storage means for storing an amplitude level to be referred to when adjusting the gain of an amplifier circuit for amplifying a signal received via a receiving antenna;
Baseband signal processing comprising: automatic gain control means for adjusting the gain of the amplification means by sharing the amplitude level stored in the amplitude level storage means for the plurality of modulation schemes circuit.

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