JP2006270254A - Wireless communication apparatus and wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication apparatus and a wireless communication system wherein countermeasures for frequency deviation of a received signal are provided to enhance the communication quality for the communication carried out by a single communication opposite station or a plurality of communication opposite stations. <P>SOLUTION: In the wireless communication apparatus provided with a transmitter 31b for modulating data and transmitting a transmission signal in compliance with a prescribed wireless communication standard to an opposite station, and a receiver 31a having an AFC function that receives a received signal in compliance with the prescribed wireless communication standard transmitted from the opposite station, detects a frequency deviation amount of the received signal, and automatically carries out frequency adjustment of a local oscillator depending on a result of the detection and a data restoration function, the transmitter 31b includes a function of informing the opposite station about the frequency deviation amount of the received signal and a function of adjusting a transmission frequency depending on the frequency deviation amount informed from the opposite station, and either of the functions can be selected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication apparatus and a radio communication system, and more particularly to a radio communication apparatus using a standard and a unique function not defined therein, and a frequency adjusting means in the radio communication system. Adaptable.

  In a conventional wireless LAN system that performs wireless communication compliant with IEEE802.11, normal transmission is performed from a transmitter on the transmission side (base side or terminal side), and a receiver on the reception side (terminal side or base side) Receive. At this time, the receiver is equipped with an AFC (Automatic Frequency Control) function for detecting the frequency shift amount of the received signal and automatically adjusting the frequency of the local oscillator according to the detection result.

  By the way, in various wireless communication devices, a unique function that is not defined in the standard may be mounted on the wireless communication device. As a specific example, products equipped with wireless communication units compliant with IEEE802.11, which is a wireless LAN standard, have begun to appear, and products with wireless communication units with various unique functions that are not compliant with IEEE802.11 have also started to appear. It is expected to become more popular in the future. From this point of view, a unique function that takes measures against frequency deviation of the received signal is desired.

For example, Patent Document 1 discloses an automatic frequency adjusting device that adjusts the oscillation frequency of a local oscillator of a receiver. Since this automatic frequency adjustment device has a delay from the detection of the frequency shift to the completion of the frequency adjustment, it cannot be applied to a wireless LAN (IEEE802.11a) in which AFC must converge at a high speed at the head of the received data frame.
JP 2003-229744 A

  The present invention has been made in order to solve the above-described conventional problems, and in communication where there is a single communication station or a plurality of communication partner stations, wireless communication that can improve communication quality by adding a frequency shift countermeasure for received signals. An object is to provide an apparatus and a wireless communication system.

  The wireless communication apparatus of the present invention has a function of modulating data to transmit a transmission signal compliant with a predetermined wireless communication standard to a counterpart station and a function of adjusting a transmission frequency in accordance with a frequency shift amount notified from the counterpart station And a receiver that receives a received signal that conforms to a predetermined wireless communication standard transmitted from the partner station and has a data restoration function.

  The wireless communication device of the present invention receives a received signal that conforms to a predetermined wireless communication standard transmitted from a partner station, detects the amount of frequency deviation of the received signal, and automatically adjusts the frequency of the local oscillator according to the detection result. Receiver having an AFC function and a data restoration function to be performed in an automatic manner, a function of modulating data and transmitting a transmission signal compliant with a predetermined wireless communication standard to the other station and a frequency deviation amount of the received signal to the other station And a transmitter having the function of

  The wireless communication device of the present invention includes a transmitter that modulates data and transmits a transmission signal that conforms to a predetermined wireless communication standard to a counterpart station, and a reception signal that conforms to the predetermined wireless communication standard transmitted from the counterpart station And a receiver having an AFC function and a data restoration function for automatically detecting the frequency deviation of the received signal and automatically adjusting the frequency of the local oscillator according to the detection result. A function of notifying the counterpart station of the frequency deviation amount of the received signal and a function of adjusting the transmission frequency in accordance with the frequency deviation amount notified from the counterpart station can be selected.

  The wireless communication system of the present invention is a wireless communication system that performs wireless data communication based on a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device, The wireless communication device receives a signal transmitted from the first wireless communication device, detects a frequency shift amount of the received signal, demodulates data using the AFC function, and detects the frequency shift amount of the received signal. To the first wireless communication apparatus, and the first wireless communication apparatus adjusts the transmission frequency according to the frequency deviation amount notified from the second wireless communication apparatus.

  The wireless communication system of the present invention is a wireless communication system that performs wireless data communication based on a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device, The wireless communication device receives the signal transmitted from the second wireless communication device, detects the frequency shift amount of the received signal, demodulates the data using the AFC function, and also detects the frequency shift of the detected received signal. Adjust the transmission frequency according to the amount.

  According to the present invention, it is possible to provide a radio communication apparatus and a radio communication system capable of improving communication quality by adding a countermeasure for frequency deviation of received signals in communication in which one or a plurality of communication partner stations exist.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this description, common parts are denoted by common reference numerals throughout the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a wireless LAN communication system according to the first embodiment of this invention. This wireless LAN communication system is, for example, between a first wireless communication device 11 used as a base station (master unit) or a terminal station (slave device) and a second wireless communication device 12 used as a terminal station. Wireless data communication conforming to a predetermined wireless communication standard (for example, IEEE802.11a) is performed.

  In the communication system of the first embodiment, the first wireless communication device 11 modulates data and superimposes it on a carrier wave signal, and transmits a transmission signal compliant with a predetermined wireless communication standard to the counterpart station, and A transmitter having a function of adjusting the transmission frequency in accordance with the frequency deviation notified from the partner station, and a receiver having a data restoration function for receiving a reception signal compliant with a predetermined wireless communication standard transmitted from the partner station Machine.

  On the other hand, the second wireless communication device 12 receives a reception signal that conforms to a predetermined wireless communication standard transmitted from the partner station, detects the frequency deviation amount of the reception signal, and determines the frequency of the local oscillator according to the detection result. A receiver having an AFC function and a data restoration function that automatically adjusts, a function of modulating data and transmitting a transmission signal that complies with a predetermined wireless communication standard, and a frequency shift amount of the reception signal And a transmitter having a function of notifying a station.

  FIG. 2 is a frame sequence chart illustrating a state in which data communication is performed in the communication system according to the first embodiment. Here, the station 1 is the first wireless communication apparatus 11 in FIG. 1, and the station 2 is the second wireless communication apparatus 12 in FIG.

  As shown in FIG. 2, in the initial state, the station 1 normally transmits to the station 2 which is a communication partner station. The station 2 detects a difference between the transmission frequency of the station 1 and the reception frequency of the own station (station 2), demodulates the received signal after applying correction. That is, the AFC function is activated (ON) to correct the reception frequency shift, and then the data is restored. Furthermore, the station 2 notifies the station 1 of the frequency shift amount between the station 1 and its own station (station 2) at the next transmission opportunity. The station 1 that has received the frequency deviation amount notification with the station 2 performs transmission at a frequency adjusted for the frequency deviation at the next transmission opportunity.

  In other words, in the wireless LAN communication system according to the first embodiment, when the signal transmitted from the first wireless communication device 11 is received by the second wireless communication device 12, the frequency shift amount of the received signal is detected at each reception. Then, the AFC function is activated (ON) to demodulate the data and notify the first wireless communication apparatus 11 of the detected frequency deviation amount of the received signal. As a result, the first wireless communication device 11 adjusts the transmission frequency according to the frequency deviation amount notified from the second wireless communication device 12.

  As described above, according to the wireless communication system of the first embodiment, the first wireless communication device 11 is a receiver of the second wireless communication device (communication counterpart station) 12 that receives a reception signal and a reception oscillator. Since the frequency offset in which the frequency shift amount is detected is notified (feedback), the frequency offset can be eliminated by adjusting the transmission frequency in accordance with the frequency shift amount. As a result, the second wireless communication apparatus (communication partner station) 12 can receive a signal with a small frequency deviation, and the communication quality is improved.

  Further, according to the first wireless communication device 11, when wireless data communication conforming to, for example, IEEE802.11 is performed between two wireless communication devices, the communication partner station has a function of notifying a frequency deviation amount. Communication quality can be improved.

<Example of Wireless Communication Device in Wireless Communication System of FIG. 1>
FIG. 3 is a block diagram showing an example of each wireless communication device in the wireless LAN communication system of FIG. The wireless communication apparatus in FIG. 3 includes a wireless antenna 30, a hardware unit 31, and a software unit 33.

  In the receiver 31a of the hardware unit 31, 312 is an RF (high frequency) / IF (intermediate frequency) unit for the receiver, 313 is an analog / digital (A / D) conversion unit, 314 is a frequency shift amount detection unit, 315 Is a data demodulator for demodulating received data.

  In the transmitter 31b of the hardware unit 31, 316 is a data modulation unit that modulates transmission data, 317 is a frequency adjustment unit, 318 is a digital / analog (D / A) conversion unit, and 319 is an R / F unit for the transmitter. It is.

  Reference numeral 32 denotes a frequency deviation storage unit that stores the frequency deviation obtained by the frequency deviation detection unit 314 of the receiver and adjusts the local oscillation frequency of the frequency adjustment unit 317 of the transmitter based on the stored information.

  The software unit 33 in FIG. 3 includes a reception data interpretation unit 331 having a reception data interpretation function for interpreting reception data, and a transmission instruction unit 332 having a transmission data instruction function for generating transmission data.

  According to the wireless communication apparatus having the above configuration, AFC can be converged at a high speed at the beginning of a frame of received data, and it is suitable for use in a system employing OFDM that does not use a DC component.

<Another example of the wireless communication apparatus in the wireless communication system of FIG. 1>
As each of the wireless communication devices 11 and 12 in the wireless communication system of FIG. 1, a transmitter that modulates data and superimposes it on a carrier wave signal and transmits a transmission signal compliant with a predetermined wireless communication standard to the partner station, and the partner station An AFC function and a data restoration function for receiving a received signal compliant with a predetermined wireless communication standard, detecting a frequency shift amount of the received signal, and automatically adjusting the frequency of the local oscillator according to the detection result A receiver having a function of notifying the counterpart station of the frequency shift amount of the received signal, and a function of adjusting a transmission frequency according to the frequency shift amount notified from the counterpart station, Can be used.

  When a wireless communication device having such a selection function is used as the first wireless communication device 11, for example, the access frequency (AP) side mode is selected and the transmission frequency according to the frequency deviation amount notified from the partner station It is sufficient to activate the function of adjusting the. Further, when used as the second wireless communication device 12, for example, a terminal (STA) side mode may be selected to activate a function of notifying the counterpart station of the frequency deviation amount of the received signal. According to the wireless communication apparatus having the above configuration, the configuration of the wireless communication apparatus to be used can be standardized.

<Modification of Second Wireless Communication Device in Wireless Communication System of First Embodiment>
FIG. 4 is a frame sequence chart showing a state in which data communication is performed by exchanging frames between a parent device and a child device using a modification of the second wireless communication device 12 in the wireless communication system of the first embodiment. is there.

  In this modification of the radio communication system, the station 2 activates (turns on) the AFC function to complete the frequency adjustment, and at the reception opportunity after completing the notification of the frequency deviation amount, the frequency deviation amount of the received signal And a function of stopping (OFF) the AFC function (frequency deviation correction function). In FIG. 4, the normal transmission from the station 1 to the station 2 is a call of the station 2 or a broadcast. The station 2 performs a series of communications with the station 1 to stop (OFF) the AFC, and then transmits, for example, an acknowledgment signal (Ack) to the station 1.

  As described above, according to the wireless communication system using the modification of the second wireless communication device, the station 2 can reduce the power consumption by the amount of stopping the AFC function. This is particularly suitable when 2 is a terminal station.

<Modification of First Wireless Communication Device in Wireless LAN Communication System of First Embodiment>
The transmitter of the first wireless communication apparatus determines whether or not the amount of frequency deviation detected by the receiver of the local station is included in the standard (within the range defined by the Radio Law). May be modified so as to further adjust the transmission frequency in accordance with the notified frequency deviation amount and, if not included in the range, further adjust the transmission frequency in accordance with the limit value of the range. .

  According to the wireless communication apparatus having the above-described configuration, it is possible to limit the range of the transmission frequency, and there is an advantage that when there is a regulation for the transmission frequency, this can be observed.

  FIG. 5 is a frame sequence chart illustrating a state in which data communication is performed between a parent device and a child device using a modification of the first wireless communication device in the wireless LAN communication system according to the first embodiment.

  In this modification of the wireless LAN communication system, the station 1 compares the frequency deviation amount notified from the station 2 with a predetermined threshold value, and if the amount is within a predetermined range, the notified frequency deviation If the amount exceeds the predetermined range, the limit value of the range is set as the correction target frequency, and the transmission frequency from the next time is adjusted according to the correction target frequency.

  According to such a wireless LAN communication system, the range of the transmission frequency of the station 1 can be limited, and there is an advantage that this can be observed when there is a regulation for the transmission frequency.

<Second Embodiment>
In the wireless LAN communication system of the second embodiment, the first wireless communication device 11 is used as a base station or a terminal station in the system of FIG. 1 described above, and is normally used as the second wireless communication device 12 used as a terminal station. Wireless data communication conforming to a predetermined wireless communication standard (for example, IEEE802.11a) is performed between them.

  In this wireless LAN communication system, the first wireless communication device 11 receives the signal transmitted from the second wireless communication device 12, detects the frequency shift amount of the received signal, and demodulates the data using the AFC function. At the same time, the transmission frequency is adjusted according to the detected frequency shift amount of the received signal.

  FIG. 6 is a frame sequence chart illustrating a state in which data communication is performed between a parent device and a child device in the wireless LAN communication system according to the second embodiment.

  As shown in FIG. 6, in the initial state, the station 2 normally transmits to the station 1 which is a communication partner station. The station 1 detects a frequency shift between the transmission frequency of the station 2 and the reception frequency of the own station (station 1), demodulates the received signal after applying correction. Further, the station 1 adjusts the transmission frequency in accordance with the amount of frequency deviation between the station 2 and its own station (station 1) at the next transmission opportunity.

  As described above, according to the wireless LAN communication system of the second embodiment, the function of adjusting the transmission frequency according to the detected frequency deviation amount of the received signal may be added only to the station 1, and the station 2 Transmission and reception may be performed. Therefore, there is an advantage that the communication quality between the wireless communication apparatus (station 1) according to the present invention and the wireless communication apparatus (station 2) having only a normal transmission / reception function not corresponding to the present invention is improved. That is, when performing wireless data communication conforming to, for example, IEEE802.11n between two wireless communication devices, even if the communication partner station does not have a function of notifying the frequency deviation amount, Communication quality can be improved regardless of whether or not it has a function of notifying the amount of deviation.

<Modification of First Wireless Communication Device in Wireless LAN Communication System of Second Embodiment>
Also in the wireless LAN communication system of the second embodiment, the first wireless communication device can be modified as in the wireless communication system of the first embodiment described above. According to such a wireless LAN communication system, when there is a regulation for the transmission frequency, it can be observed.

<Third Embodiment>
FIG. 7 is a block diagram showing a wireless LAN communication system according to the third embodiment of this invention. In this wireless LAN communication system, for example, a predetermined wireless communication between a first wireless communication device 11 used as a base station and a plurality of second wireless communication devices 12 each having a normal transmission / reception function used as a terminal station is performed. Wireless data communication conforming to a wireless communication standard (for example, IEEE802.11n) is performed.

  FIG. 8 is a block diagram illustrating an example of a hardware unit of the first wireless communication device 11 in the wireless LAN communication system of FIG.

  The first wireless communication apparatus includes a plurality of antennas 80, a receiver 81, and a transmitter 82. The receiver 81 receives a reception signal compliant with a predetermined wireless communication standard (for example, IEEE802.11n) transmitted from the counterpart station for each antenna 80, detects the frequency deviation amount of the reception signal, and synthesizes the frequency deviation amount. A function of combining a plurality of frequency shift amount detection results by the unit 83 to obtain a final frequency shift amount detection result, and automatically adjusting the frequency of the local oscillator according to the final frequency shift amount detection result It has an AFC function and a data restoration function. The transmitter 82 modulates data and superimposes it on a carrier wave signal to transmit a transmission signal compliant with a predetermined wireless communication standard to a partner station and a final frequency obtained by the frequency deviation amount combining unit 83. It has a function of adjusting the transmission frequency according to the deviation amount detection result. Here, one local oscillator (frequency synthesizer, PLL, etc.) 84 and frequency deviation amount synthesizing unit 83 are shared by the receiver 81 and the transmitter 82. The receiver 81 shares one demodulator 85, and the transmitter 82 shares one modulator 86.

  FIG. 9 is a frame sequence chart showing a state in which data communication is performed between the parent device and the plurality of child devices in FIG. As shown in FIG. 9, in the initial state, the station 2 which is the second wireless communication device 12 in FIG. 7 and the station 1 whose station 3 is the communication partner station (the first wireless communication device 11 in FIG. 7). Send normally. In this example, the transmission of the station 2 is preceded.

  The station 1 receives signals transmitted from the stations 2 and 3 by a plurality of antennas, and from the signals obtained from the respective antennas, the station 2 and the station 3 transmit their respective transmission frequencies and their own stations (station 1). The amount of frequency deviation from the received frequency is detected, and data is demodulated using the AFC function (the received signal is corrected and then demodulated). At this time, the station 1 uses, as a composite value (average value) of a plurality of detected frequency deviation amounts, the priority order of quality of service (QoS) (for example, the order of video communication, voice communication, Web communication, and mail communication). ) To obtain the frequency adjustment target value, for example, an average value weighted by the received power. Then, at the next transmission opportunity, the frequency of the transmission signal is adjusted according to the frequency adjustment target value. That is, when transmitting to the station 2 at the next transmission opportunity, the station 1 adjusts the transmission frequency according to the amount of frequency deviation between the station 2 and its own station (station 1), and the station 3 at the next transmission opportunity. When transmitting to the destination, the transmission frequency is adjusted according to the amount of deviation between the station 3 and its own station (station 1), and when transmitting a broadcast signal to a plurality of stations such as a notification signal, The transmission frequency is adjusted according to the composite value.

  As described above, according to the wireless communication system of the third embodiment, the wireless communication device according to the present invention and a plurality of wireless communication devices not corresponding to the present invention (wireless communication devices having only normal transmission / reception functions) are provided. When communication is performed between two antennas, the combined value of the amount of frequency deviation detected by a plurality of antennas is used as a frequency adjustment target value, so that the effects of noise and multipath fading can be reduced and communication quality is improved.

  FIG. 10 is a block diagram showing an example of a hardware configuration of a semiconductor chip on which the baseband unit of the wireless communication apparatus of the present invention is mounted.

  In the semiconductor chip 100 shown in FIG. 10, a CPU (central processing unit) 102, an external I / F (interface) control unit 103, a MAC processing unit 104, and a memory control unit 105 are connected to a system bus 101. A PHY (physical layer) processing unit 106 is connected to the MAC processing unit 104. An internal memory 107 is connected to the memory control unit 105, and an external memory 108 outside the chip is connected as necessary. Note that only the external memory 108 may be connected to the memory control unit 105.

  FIG. 11 is a block diagram illustrating an example of a software configuration for controlling the baseband unit (hardware configuration of the semiconductor chip) of the wireless communication apparatus illustrated in FIG. The firmware (FW) 110 stored in the memory unit in FIG. 11 includes a data transmission processing unit 111, a protocol processing unit 112, a host I / F processing unit 113, and a hardware (HW) driver 114. The host I / F processing unit 113 controls the upper application 116 via the host driver 115.

  The wireless communication standard that can be used in the present invention is not limited to IEEE802.11a and IEEE802.11n, but may be other wireless communication standards.

  The radio communication system and radio communication apparatus according to this embodiment described above are summarized as follows.

(1) Modulates data and superimposes it on a carrier wave signal, and adjusts the transmission frequency according to the function of transmitting a transmission signal compliant with a predetermined wireless communication standard to the partner station and the frequency deviation notified from the partner station A transmitter having the function of
A wireless communication apparatus comprising: a receiver that receives a reception signal that conforms to a predetermined wireless communication standard transmitted from a partner station and has a data restoration function.

(2) In the wireless communication device according to (1), the transmitter determines whether or not the frequency deviation amount notified from the counterpart station is included in a predetermined range, and is included in the range. Further has a function of adjusting the transmission frequency according to the notified frequency deviation amount, and adjusting the transmission frequency according to the limit value of the range when not included in the range.

(3) AFC function that receives a received signal compliant with a predetermined wireless communication standard transmitted from a partner station, detects the frequency shift amount of the received signal, and automatically adjusts the frequency of the local oscillator according to the detection result And a receiver having a data restoration function;
A transmitter having a function of modulating data and superimposing it on a carrier wave signal, transmitting a transmission signal conforming to a predetermined wireless communication standard to the counterpart station, and notifying the counterpart station of a frequency shift amount of the reception signal; A wireless communication device provided.

(4) In the wireless communication device of (3), the receiver completes frequency adjustment using the AFC function, and receives a frequency shift of the received signal at a reception opportunity after completing notification of the frequency shift amount. It further has a function of stopping the amount detection function and the AFC function (frequency shift correction function).

(5) In the wireless communication device of (3), the transmitter determines whether or not the frequency deviation detected by the receiver of the local station is included in a predetermined range, and is included in the range. In such a case, the transmission frequency is adjusted according to the notified frequency deviation amount, and when not included in the range, the transmission frequency is further adjusted according to the limit value of the range.

(6) a transmitter that modulates data and superimposes it on a carrier wave signal, and transmits a transmission signal compliant with a predetermined wireless communication standard to a partner station;
AFC function and data recovery for receiving a received signal compliant with a predetermined wireless communication standard transmitted from a partner station, detecting the frequency deviation of the received signal, and automatically adjusting the frequency of the local oscillator according to the detection result A receiver having a function,
The transmitter has a function of notifying the counterpart station of the frequency deviation amount of the received signal, and a function of adjusting a transmission frequency according to the frequency deviation amount notified from the counterpart station, and can select either of them. Wireless communication device.

(7) A wireless communication system that performs wireless data communication based on a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device, and is transmitted from the first wireless communication device. The received signal is received by the second wireless communication device to detect the frequency shift amount of the received signal, the AFC function is used to demodulate the data, and the detected frequency shift amount of the received signal is determined to the first wireless communication. The first wireless communication device adjusts the transmission frequency according to the frequency deviation amount notified from the second wireless communication device.

(8) In the wireless communication system of (7), the first wireless communication device is the wireless communication device of (1) or (2), and the second wireless communication device is (3) to (5). ).

(9) In the wireless communication system according to (7), each of the wireless communication devices is the wireless communication device according to (6).

(10) A wireless communication system that performs wireless data communication conforming to a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device, wherein the first wireless communication device The signal transmitted from the second wireless communication device is received to detect the frequency shift amount of the received signal, the data is demodulated using the AFC function, and the transmission frequency is set according to the detected frequency shift amount of the received signal. adjust.

(11) In the wireless communication system according to (10), the first wireless communication device is the wireless communication device according to (1) or (2), and the second wireless communication device has a normal transmission / reception function. A wireless communication device.

(12) a plurality of antennas;
A reception signal that conforms to a predetermined wireless communication standard transmitted from the partner station for each of the plurality of antennas is received, a frequency deviation amount of the reception signal is detected, and a value obtained by combining detection results of the plurality of frequency deviation amounts is obtained. A function having a final frequency deviation detection result, a receiver having an AFC function and a data restoration function for automatically adjusting the frequency of the local oscillator according to the final frequency deviation detection result;
A function of modulating data and superimposing it on a carrier wave signal to transmit a transmission signal compliant with a predetermined wireless communication standard to a partner station and a function of adjusting a transmission frequency according to the final frequency deviation detection result A wireless communication device comprising a transmitter.

(13) A wireless communication system that performs wireless data communication conforming to a predetermined wireless communication standard between the first wireless communication device of (12) and a plurality of second wireless communication devices having a normal transmission / reception function The first wireless communication device receives signals transmitted from the plurality of second wireless communication devices, detects a frequency shift amount of the received signal, and demodulates data using the AFC function. The transmission frequency is adjusted according to the detected frequency shift amount of the received signal.

1 is a block diagram showing a wireless LAN communication system according to a first embodiment of the present invention. The frame sequence chart which shows a mode that communication is performed between the main | base station and the subunit | mobile_unit of 1st Embodiment. The block diagram which shows an example of each radio | wireless communication apparatus in the radio | wireless communications system of FIG. The frame sequence chart which shows a mode that communication is performed between a main | base station and a subunit | mobile_unit using the modification of a 2nd radio | wireless communication apparatus in the radio | wireless communications system of 1st Embodiment. The frame sequence chart which shows a mode that data communication is performed between a main | base station and a subunit | mobile_unit using the modification of a 1st radio | wireless communication apparatus in the wireless LAN communication system of 1st Embodiment. The frame sequence chart which shows a mode that communication is performed between a main | base station and a subunit | mobile_unit in the wireless LAN communication system of the 2nd Embodiment of this invention. The block diagram which shows the wireless LAN communication system of the 3rd Embodiment of this invention. FIG. 8 is a block diagram showing an example of a hardware unit of a first wireless communication device in the communication system of FIG. 7. The frame sequence chart which shows a mode that data communication is performed between the main | base station in FIG. 7, and a some subunit | mobile_unit. The block diagram which shows an example of the hardware constitutions of the semiconductor chip which mounts the baseband part of the radio | wireless communication apparatus of this invention. FIG. 11 is a block diagram showing an example of a software configuration for controlling the baseband unit of the wireless communication apparatus shown in FIG. 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 30 ... Wireless antenna, 31 ... Hardware part, 31a ... Receiver, 31b ... Transmitter, 32 ... Frequency shift | offset | difference amount memory | storage part, 33 ... Software part, 312 ... RF / IF part for receivers, 313 ... Analog / digital Conversion unit, 314... Frequency deviation detection unit, 315... Data demodulation unit, 316... Data modulation unit, 317... Frequency adjustment unit, 318 ... digital / analog conversion unit, 319 ... R / F unit for transmitter.

Claims (5)

A transmitter having a function of modulating data and transmitting a transmission signal conforming to a predetermined wireless communication standard to a counterpart station and a function of adjusting a transmission frequency according to a frequency deviation amount notified from the counterpart station;
A wireless communication apparatus comprising: a receiver that receives a reception signal that conforms to a predetermined wireless communication standard transmitted from the partner station and has a data restoration function. AFC function and data recovery for receiving a received signal compliant with a predetermined wireless communication standard transmitted from a partner station, detecting the frequency deviation of the received signal, and automatically adjusting the frequency of the local oscillator according to the detection result A functioning receiver;
A transmitter having a function of modulating data and transmitting a transmission signal compliant with a predetermined wireless communication standard to the counterpart station and a function of notifying the counterpart station of a frequency shift amount of the reception signal. A wireless communication device. A transmitter that modulates data and transmits a transmission signal that complies with a predetermined wireless communication standard to a partner station;
AFC function and data for receiving a received signal compliant with a predetermined wireless communication standard transmitted from a partner station, detecting the frequency deviation of the received signal, and automatically adjusting the frequency of the local oscillator according to the detection result A receiver having a restoration function,
The transmitter has a function of notifying the counterpart station of the frequency deviation amount of the received signal, and a function of adjusting a transmission frequency according to the frequency deviation amount notified from the counterpart station, and can be selected from either A wireless communication apparatus. A wireless communication system that performs wireless data communication based on a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device,
The second wireless communication device receives a signal transmitted from the first wireless communication device, detects a frequency shift amount of the received signal, demodulates data using an AFC function, and detects the received signal To the first wireless communication device,
The wireless communication system, wherein the first wireless communication device adjusts a transmission frequency according to a frequency shift amount notified from the second wireless communication device. A wireless communication system that performs wireless data communication based on a predetermined wireless communication standard between a first wireless communication device and a second wireless communication device,
The first wireless communication device receives a signal transmitted from the second wireless communication device to detect a frequency shift amount of a received signal, demodulates data using an AFC function, and detects the received signal. A wireless communication system, wherein a transmission frequency is adjusted according to a signal frequency shift amount.

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