Wireless communication system

Abstract

To provide a technique for allowing a receiving device to easily acquire information included in a radio signal.SOLUTION: A first receiving device 200a receives a radio signal 120 from a transmitting device 100 and transmits a first report signal 220a including a first reception result. A second receiving device 200b receives a radio signal 120 from the transmitting device 100 and transmits a second report signal 220b including a second reception result. A server 300 compares the quality of the first reception result with the quality of the second reception result, and transmits, when the quality of the first reception result is higher than the quality of the second reception result, a notification signal 320 including reception information in which the first reception result is reflected. The second receiving device 200b receives the notification signal 320 from the server 300 and acquires the reception information in substitution for the second reception result.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to communication technology, and more particularly to a wireless communication system in which a wireless signal is transmitted from a transmitting device to a receiving device.

Background Art

[0002] In a conventional radio wave receiving system, a console is connected one-to-one with a dedicated receiver. In order to increase the number of signals that can be received by one console, a plurality of receivers are connected to the console (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a wireless signal is transmitted from one transmitting device to a plurality of receiving devices, in one or more of the plurality of receiving devices, a situation may occur where the reception quality of the wireless signal is poor or the wireless signal cannot be received. In order to enable the reception of the wireless signal even in such a situation, it is possible to use a plurality of types of wireless communication methods between the transmitting device and the receiving device. However, depending on the environment between the transmitting device and the receiving device, even if a plurality of types of wireless communication methods are used, the wireless signal may not be received with sufficient quality, and information such as voice information and text information included in the wireless signal may not be correctly acquired.

[0005] The present invention has been made in view of such a situation, and an object thereof is to provide a technique for making it easier for a receiving device to acquire information included in a wireless signal.

Means for Solving the Problems

[0006] To solve the above problems, a wireless communication system according to one aspect of the present invention includes a transmitting device that transmits a wireless signal using a first wireless communication method, a first receiving device that receives a wireless signal from the transmitting device, includes a first reception result (the reception result) in a first report signal, and transmits it using a second wireless communication method, a second receiving device that receives a wireless signal from the transmitting device, includes a second reception result (the reception result) in a second report signal, and transmits it using a second wireless communication method, and a server that receives a first report signal from the first receiving device and a second report signal from the second receiving device, and compares the quality of the first reception result and the quality of the second reception result. If the quality of the first reception result is higher than the quality of the second reception result, the server selects the first reception result, includes the reception information reflecting the selected first reception result in a notification signal, and transmits it using a second wireless communication method. The second receiving device receives the notification signal from the server, acquires reception information instead of the second reception result, and uses a method different from the first and second wireless communication methods.

[0007] Furthermore, any combination of the above components, as well as conversions of the expression of the present invention between methods, apparatus, systems, recording media, computer programs, etc., are also valid embodiments of the present invention. [Effects of the Invention]

[0008] According to the present invention, information contained in a wireless signal can be easily acquired by a receiving device. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram showing the configuration of the wireless communication system according to this embodiment. [Figure 2] This diagram shows the configuration of the receiving device shown in Figure 1. [Figure 3] This diagram shows the server configuration shown in Figure 1. [Figure 4] Figure 1 is a sequence diagram showing the communication procedure using the wireless communication system. [Figure 5] This diagram shows the configuration of the receiving device according to Modification Example 1. [Figure 6] This diagram shows the server configuration related to the first modified example. [Figure 7] This diagram shows the configuration of the receiving device according to modified example 2. [Figure 8] This diagram shows the server configuration related to the modified example 2. [Modes for carrying out the invention]

[0010] Before specifically describing the present invention, let's first outline it. This embodiment relates to a wireless communication system in which a wireless signal is transmitted from a transmitting device to a plurality of receiving devices. A first wireless communication method is used for wireless communication between the transmitting device and the plurality of receiving devices. One of the plurality of receiving devices (hereinafter referred to as the "first receiving device") receives the wireless signal with a certain level of quality or higher, but another of the plurality of receiving devices (hereinafter referred to as the "second receiving device") cannot receive the wireless signal with a certain level of quality or higher. In this situation, the second receiving device cannot accurately acquire the information contained in the wireless signal.

[0011] To improve the likelihood of the second receiving device acquiring information contained in the wireless signal, each receiving device in this embodiment is also capable of communication using a second wireless communication method different from the first wireless communication method. Each receiving device generates a report signal including the reception result of the wireless signal and transmits the report signal to the server using the second wireless communication method. The server receives the report signals from each receiving device. The server compares the reception results contained in each report signal and selects the reception result with the highest quality. The server transmits reception information that reflects the selected reception result. Through this process, the second receiving device receives the reception information, which is the information contained in the wireless signal received by the first receiving device, from the server using the second wireless communication method. Since the reception information is acquired by the second receiving device, the information contained in the wireless signal is accurately acquired.

[0012] Figure 1 shows the configuration of the wireless communication system 1000. The wireless communication system 1000 includes a transmitter 100, a first receiver 200a and a second receiver 200b collectively referred to as the receiver 200, and a server 300. The transmitter 100 includes a transmitting antenna 110, the first receiver 200a includes a first receiving antenna 210a and a first communication antenna 212a, and the second receiver 200b includes a second receiving antenna 210b and a second communication antenna 212b. The first receiver 210a and the second receiver 210b are collectively referred to as the receiving antenna 210, and the first communication antenna 212a and the second communication antenna 212b are collectively referred to as the communication antenna 212.

[0013] Although the transmitting device 100 and the receiving device 200 are generally configured as a single wireless device, for the sake of clarity in this explanation, the wireless devices will be shown functionally separated into the transmitting device 100 and the receiving device 200. The number of transmitting devices 100 and receiving devices 200 included in the wireless communication system 1000 is not limited to "1" and "2," respectively.

[0014] The transmitting device 100 has a transmission function that corresponds to the first wireless communication system 400. The first wireless communication system 400 is, for example, a commercial radio or a simple radio, but is not limited thereto. The transmitting device 100 transmits a radio signal 120 from the transmitting antenna 110. The radio signal 120 includes voice information, text information, etc.

[0015] The first receiver 200a and the second receiver 200b have receiving functions that correspond to the first wireless communication system 400. For example, the distance between the second receiver 200b and the transmitter 100 is longer than the distance between the first receiver 200a and the transmitter 100. Since the configuration of the first receiver 200a and the second receiver 200b is the same, they will be described here as receiver 200.

[0016] FIG. 2 shows the configuration of the receiving apparatus 200. The receiving apparatus 200 includes a receiving antenna 210, a communication antenna 212, an amplifying unit 230, an orthogonal detection unit 232, a first ADC 234a and a second ADC 234b collectively referred to as ADC 234, a demodulating unit 236, a switching unit 238, a communication unit 240, an audio output unit 242, and a display unit 244.

[0017] The receiving antenna 210 receives the radio signal 120 from the transmitting apparatus 100. The amplifying unit 230 amplifies the received radio signal 120, and the orthogonal detection unit 232 performs orthogonal detection on the amplified radio signal 120. The orthogonal detection unit 232 outputs an I (in-phase) signal and a Q (quadrature) signal as a result of the orthogonal detection. The first ADC 234a performs analog-to-digital conversion on the I signal. The first ADC 234a outputs the signal obtained by performing analog-to-digital conversion (hereinafter, this is also referred to as the "I signal") to the demodulating unit 236 and the switching unit 238. The second ADC 234b outputs the signal obtained by performing analog-to-digital conversion (hereinafter, this is also referred to as the "Q signal") to the demodulating unit 236 and the switching unit 238. The demodulating unit 236 demodulates the I signal and the Q signal. Since a known technique may be used for demodulation, the description thereof is omitted here.

[0018] When the switching unit 238 receives the I signal and the Q signal, it outputs them to the communication unit 240. The communication unit 240 has a communication function corresponding to a second wireless communication method. The second wireless communication method is a communication method different from the first wireless communication method 400. The second wireless communication method is, for example, mobile communication, LTE (Long Term Evolution), wireless LAN (Local Area Network), but is not limited thereto. The communication unit 240 includes the I signal and the Q signal in the report signal as reception results. The reception results can also be said to be the signals obtained by subjecting the received radio signal 120 to orthogonal detection and analog-to-digital conversion. Further, the communication unit 240 also includes the time information at the time when the radio signal 120 is received, the ID of the transmitting apparatus 100 as the transmission source, and the ID of the receiving apparatus 200 in the report signal. The communication unit 240 transmits the report signal via the communication antenna 212 by the second wireless communication method. The remaining description will be given later, and we will return to FIG. 1.

[0019] When the reception result in the first receiving device 200a is referred to as the "first reception result", the reception result in the second receiving device 200b is referred to as the "second reception result". Also, when the reporting signal transmitted from the first receiving device 200a is referred to as the "first reporting signal 220a", the reporting signal transmitted from the second receiving device 200b is referred to as the "second reporting signal 220b". The first reporting signal 220a and the second reporting signal 220b are collectively referred to as the reporting signal 220.

[0020] As described above, since the distance between the second receiving device 200b and the transmitting device 100 is longer than the distance between the first receiving device 200a and the transmitting device 100, the second receiving device 200b may not be able to receive the radio signal 120 from the transmitting device 100 by the first radio communication method 400. In that case, the second receiving device 200b cannot transmit the second reporting signal 220b by the second radio communication method 410.

[0021] In FIG. 1, for the sake of simplifying the illustration, the server 300 is directly connected to the receiving device 200 by the second radio communication method 410. However, the server 300 is connected to another network, and the server 300 and the receiving device 200 may be connected by another network and the second radio communication method 410.

[0022] FIG. 3 shows the configuration of the server 300. The server 300 includes a communication unit 330, a demodulation unit 340, and a selection unit 350. The communication unit 330 receives the first reporting signal 220a from the first receiving device 200a and the second reporting signal 220b from the second receiving device 200b. The communication unit 330 obtains the first reception result from the first reporting signal 220a and obtains the second reception result from the second reporting signal 220b. The demodulation unit 340 demodulates the I signal and the Q signal of the first reception result and demodulates the I signal and the Q signal of the second reception result. The demodulation is performed in the same manner as the demodulation unit 236.

[0023] The selection unit 350 receives the demodulated result of the I signal and Q signal of the first reception result (hereinafter referred to as the "first demodulated result") and the demodulated I signal and Q signal of the second reception result (hereinafter referred to as the "second demodulated result"). The demodulated result is information obtained by demodulating the reception result. If the ID of the transmitter 100 included in the first report signal 220a matches the ID of the transmitter 100 included in the second report signal 220b, the selection unit 350 determines that the first demodulated result and the second demodulated result correspond to the same radio signal 120.

[0024] If the selection unit 350 determines that the first demodulation result and the second demodulation result correspond to the same radio signal 120, it derives the quality of the first demodulation result and the quality of the second demodulation result. The quality is, for example, BER (Bit Error Rate) and FER (Frame Error Rate). The selection unit 350 may also derive the quality of the first reception result and the quality of the second reception result by receiving the first reception result and the second reception result. The quality is, for example, SNR (Signal-to-Noise Ratio), field strength, and SINAD (Signal-to-Noise And Distortion ratio).

[0025] The selection unit 350 compares these quality levels and selects the demodulation result corresponding to the higher quality level. For example, if the quality of the first demodulation result (first reception result) is higher than the quality of the second demodulation result (second reception result), the selection unit 350 selects the first demodulation result. When three or more receiving devices 200 receive a wireless signal 120 from the transmitting device 100, the three or more receiving devices 200 transmit a report signal 220. In that case, the communication unit 330 of the server 300 receives three or more report signals 220, so the selection unit 350 compares the three or more demodulation results (reception results) and selects the demodulation result corresponding to the highest quality level.

[0026] The communication unit 330 includes the selected demodulation result in the notification signal. The communication unit 330 transmits the notification signal. The destination of the notification signal is the receiving device 200 corresponding to the unselected demodulation result (received result). For example, the second receiving device 200b is set as the destination. The destination of such a receiving device 200 is identified by the ID of the receiving device 200 included in the report signal 220. The receiving device 200 corresponding to the selected demodulation result (received result), for example, the first receiving device 200a, may also be set as the destination.

[0027] Furthermore, the communication unit 330 stores information about the communication group to which the ID of the transmitting device 100 included in the report signal 220 belongs. A communication group is a group of receiving devices 200 that should receive the radio signal 120 transmitted by the transmitting device 100. The communication group information indicates the IDs of the multiple receiving devices 200 included in the communication group. If there are receiving devices 200 that have not received the report signal 220, the communication unit 330 identifies such receiving devices 200 based on the communication group information. The communication unit 330 sends a notification signal to the identified receiving device 200. For example, if the second report signal 220b from the second receiving device 200b has not been received, a notification signal 320 containing the selected first demodulation result is sent to the second receiving device 200b. In the case of an analog conventional system, the receiving frequency, CTCSS frequency, and DCS code may be used to identify such receiving devices 200, and in the case of other individual calling systems, a group ID may be used. Return to Figure 1.

[0028] Server 300 transmits a second notification signal 320b to the second receiving device 200b. Server 300 may also transmit a first notification signal 320a to the first receiving device 200a. The first notification signal 320a and the second notification signal 320b are collectively referred to as notification signal 320. The second receiving device 200b receives the notification signal 320 from Server 300 using the second wireless communication method 410.

[0029] The communication unit 240 in Figure 2 receives a notification signal 320 from the server 300 via the communication antenna 212. The communication unit 240 obtains the demodulation result from the notification signal 320 and outputs the demodulation result to the switching unit 238. If the demodulation result is audio information, the switching unit 238 outputs the audio information to the audio output unit 242, and if the demodulation result is text information, it outputs the text information to the display unit 244. The audio output unit 242 includes a speaker and outputs the audio information as audio from the speaker. The display unit 244 displays the text information. In other words, the second receiving device 200b obtains and outputs the demodulation result received from the server 300 instead of the demodulation result from the demodulation unit 236. The second receiving device 200b also performs processing based on the notification signal 320 from the server 300 even if it is unable to receive the wireless signal 120.

[0030] On the other hand, if the communication unit 240 in Figure 2 does not receive a notification signal from the server 300 via the communication antenna 212, as in the first receiving device 200a, the demodulation unit 236 outputs the audio information to the audio output unit 242 if the demodulation result is audio information, and outputs the text information to the display unit 244 if the demodulation result is text information. The subsequent processing is the same as before, so the explanation is omitted here.

[0031] This configuration can be implemented in hardware terms using the CPU, memory, and other LSIs of any computer, and in software terms using programs loaded into memory, but here we are depicting the functional blocks that are realized through the cooperation of these components. Therefore, it will be understood by those skilled in the art that these functional blocks can be implemented in various ways using hardware alone, software alone, or a combination of both.

[0032] The operation of the wireless communication system 1000 with the above configuration will now be explained. Figure 4 is a sequence diagram showing the communication procedure by the wireless communication system 1000. The transmitting device 100 transmits a wireless signal 120 (S10, S12). The first receiving device 200a includes the first reception result when it receives the wireless signal 120 in the first report signal 220a and transmits the first report signal 220a to the server 300 (S14). The second receiving device 200b includes the second reception result when it receives the wireless signal 120 in the second report signal 220b and transmits the second report signal 220b to the server 300 (S16). The server 300 compares the first reception result included in the first report signal 220a and the second reception result included in the second report signal 220b and selects one of them (S18). The server 300 transmits a notification signal 320 including the selected result (S20).

[0033] (Variation 1) Previously, the report signal 220 included the I signal and the Q signal, and the notification signal 320 included the demodulated result. In Modification 1, the report signal 220 includes the I signal and the Q signal, and the notification signal 320 also includes the I signal and the Q signal.

[0034] Figure 5 shows the configuration of the receiving device 200. The receiving device 200 includes a receiving antenna 210 and a display unit 244, similar to Figure 2. The components from the receiving antenna 210 to the ADC 234 are the same as in Figure 2. The switching unit 238 and the communication unit 240 are also the same as in Figure 2, and transmit a report signal 220, which includes the I signal and Q signal as the received result, via the communication antenna 212 using the second wireless communication method. In the modified example 1, the first reception result, the second reception result, the first report signal 220a, and the second report signal 220b are defined in the same way as before.

[0035] Figure 6 shows the configuration of server 300. Server 300 includes a communication unit 330 and a selection unit 350. Similar to Figure 3, the communication unit 330 receives a first report signal 220a from the first receiving device 200a and a second report signal 220b from the second receiving device 200b. The communication unit 330 obtains a first reception result from the first report signal 220a and a second reception result from the second report signal 220b.

[0036] The selection unit 350 receives the I signal and Q signal of the first reception result and the I signal and Q signal of the second reception result. The selection unit 350 determines that the first and second reception results correspond to the same radio signal 120 if the ID of the transmitter 100 included in the first report signal 220a matches the ID of the transmitter 100 included in the second report signal 220b. If the selection unit 350 determines that the first and second reception results correspond to the same radio signal 120, it derives the quality of the first reception result and the quality of the second reception result. The quality is, for example, SNR, field strength, and SINAD.

[0037] The selection unit 350 compares these quality levels and selects the reception result corresponding to the higher quality level. For example, if the quality of the first reception result is higher than that of the second reception result, the selection unit 350 selects the first reception result. If three or more receiving devices 200 receive the radio signal 120 from the transmitting device 100, the selection unit 350 compares the three or more reception results and selects the single reception result corresponding to the highest quality.

[0038] The communication unit 330 includes the selected reception result in the notification signal 320. The communication unit 330 transmits the notification signal 320. The destination of the notification signal 320 is set as before. The communication unit 330 transmits the notification signal 320 to the receiving device 200 at the set destination.

[0039] The communication unit 240 in Figure 5 receives a notification signal 320 from the server 300 via the communication antenna 212. The communication unit 240 obtains the reception result from the notification signal 320 and outputs the reception result to the switching unit 238. The switching unit 238 outputs the reception result to the demodulation unit 236. The demodulation unit 236 demodulates the I signal and Q signal, which are the reception results from the switching unit 238. If the demodulation result is audio information, the audio information is output to the audio output unit 242, and if the demodulation result is text information, the text information is output to the display unit 244.

[0040] On the other hand, as shown in the first receiving device 200a in Figure 1, if the communication unit 240 in Figure 5 does not receive a notification signal from the server 300 via the communication antenna 212, it demodulates the I signal and Q signal, which are the results of reception from the ADC 234. The subsequent processing is the same as before, so the explanation is omitted here.

[0041] (Modification 2) In Modification 2, the demodulated result is included in the report signal 220 and the notification signal 320. Figure 7 shows the configuration of the receiving device 200. The receiving device 200 includes a receiving antenna 210 and a display unit 244, similar to Figure 2. The components from the receiving antenna 210 to the ADC 234 are the same as in Figure 2. The demodulation unit 236 demodulates the I signal and Q signal, which are the received results from the ADC 234. When the switching unit 238 receives the demodulated result from the demodulation unit 236, it outputs it to the communication unit 240. The communication unit 240 includes the demodulated result as the received result in the report signal 220. The communication unit 240 transmits the report signal 220 via the communication antenna 212 using the second wireless communication method. In Modification 2, the first demodulated result, the second demodulated result, the first report signal 220a, and the second report signal 220b are defined in the same way as before.

[0042] Figure 8 shows the configuration of server 300. Server 300 includes a communication unit 330 and a selection unit 350. Similar to Figure 3, the communication unit 330 receives a first report signal 220a from the first receiving device 200a and a second report signal 220b from the second receiving device 200b. The communication unit 330 obtains a first demodulation result from the first report signal 220a and a second demodulation result from the second report signal 220b.

[0043] The selection unit 350 receives the first demodulation result and the second demodulation result. The selection unit 350 determines that the first demodulation result and the second demodulation result correspond to the same radio signal 120 if the ID of the transmitter 100 included in the first report signal 220a matches the ID of the transmitter 100 included in the second report signal 220b.

[0044] If the selection unit 350 determines that the first demodulation result and the second demodulation result correspond to the same radio signal 120, it derives the quality of the first demodulation result and the quality of the second demodulation result. The quality is, for example, BER and FER. The selection unit 350 compares these qualities and selects the demodulation result corresponding to the higher quality. If three or more receiving devices 200 receive the radio signal 120 from the transmitting device 100, the selection unit 350 compares the three or more received demodulation results and selects the one demodulation result corresponding to the highest quality.

[0045] The communication unit 330 includes the selected demodulation result in the notification signal 320. The communication unit 330 transmits the notification signal 320. The destination of the notification signal 320 is set as before. The communication unit 330 transmits the notification signal 320 to the receiving device 200 at the set destination.

[0046] The communication unit 240 in Figure 7 receives a notification signal 320 from the server 300 via the communication antenna 212. The communication unit 240 obtains the demodulation result from the notification signal 320 and outputs the demodulation result to the switching unit 238. If the demodulation result is audio information, the switching unit 238 outputs the audio information to the audio output unit 242, and if the demodulation result is text information, it outputs the text information to the display unit 244.

[0047] On the other hand, as shown in the first receiving device 200a in Figure 1, if the communication unit 240 in Figure 5 has not received a notification signal from the server 300 via the communication antenna 212, the demodulation unit 236 outputs the audio information to the audio output unit 242 if the demodulation result is audio information, and outputs the text information to the display unit 244 if the demodulation result is text information. The subsequent processing is the same as before, so the explanation is omitted here.

[0048] According to this embodiment, if the quality of the first reception result in the first receiving device is higher than the quality of the second reception result in the second receiving device, the reception information reflecting the first reception result is transmitted to the second receiving device. Therefore, even if the quality of the second reception result in the second receiving device is low, the reception result in the second receiving device can be improved. Furthermore, even if the quality of the second reception result in the second receiving device is low, the reception result in the second receiving device is improved, making it easier for the receiving device to acquire the information contained in the radio signal. In addition, when multiple receiving devices attempt to receive the same radio signal, and some receiving devices are able to receive the radio signal well, while others are unable to receive the radio signal well due to the effects of weak fields or interference, even the receiving devices that could not receive the signal well can receive a good demodulation result.

[0049] Furthermore, each receiving device transmits a signal obtained by quadrature detection of the received wireless signal to the server as the reception result, and receives the demodulated result from the server, thus improving the flexibility of the configuration. Furthermore, each receiving device transmits a signal obtained by quadrature detection of the received wireless signal to the server as the reception result, and receives the quadrature detected signal from the wireless signal, thus improving the flexibility of the configuration. Furthermore, each receiving device transmits the information obtained by demodulating the received wireless signal to the server as the reception result, and receives the demodulated result from the server, thus improving the flexibility of the configuration. In addition, even a receiving device that was unable to receive the wireless signal can obtain reception information from the server and output the contents of the wireless signal.

[0050] The present invention has been described above based on examples. These examples are illustrative, and it will be understood by those skilled in the art that various modifications are possible in combinations of their components and processing processes, and that such modifications also fall within the scope of the present invention.

[0051] The above explanation used the example of a wireless signal containing audio and text information, but the information contained in a wireless signal is not limited to audio and text information; it may also include video information, program code information, etc. [Explanation of symbols]

[0052] 100 Transmitter, 110 Transmitting antenna, 120 Radio signal, 200 Receiver, 210 Receiving antenna, 212 Communication antenna, 220 Report signal, 230 Amplifier, 232 Quadrature detection unit, 234 ADC, 236 Demodulator, 238 Switching unit, 240 Communication unit, 242 Audio output unit, 244 Display unit, 300 Server, 320 Notification signal, 330 Communication unit, 340 Demodulator, 350 Selection unit, 400 First wireless communication method, 410 Second wireless communication method, 1000 Wireless communication system.

Claims

1. A transmitting device that transmits wireless signals using a first wireless communication method, The wireless signal is received, and a first report signal including the first reception result obtained by reception is received A first receiving device that transmits using a second wireless communication method different from the first wireless communication method, The wireless signal is received, and the second report signal including the second reception result obtained by reception is the 2. A second receiving device that transmits using a wireless communication method, The first report signal and the second report signal are received, and the quality of the first reception result and the 2. Compare the quality of the received results and select the received result with higher quality, and the selected received result Identify a receiving device different from the transmitting receiving device, and use the selected receiving result as a notification signal. The server that transmits to the receiving device identified by the above Equipped with, Of the first receiving device and the second receiving device, the specified receiving device receives The receiving device receives the reception result selected by the server included in the notification signal. Use as a result Wireless communication system.

2. The server is From the received first report signal and second report signal, the first reception result and second reception result are obtained, respectively. Get the result, The acquired first reception result and the second reception result are demodulated to obtain the first demodulated result. And generate a second recovery result, Comparing the quality of the first demodulated result and the quality of the second demodulated result, the higher quality is... The wireless communication system according to claim 1, which selects a reception result corresponding to the demodulation result.

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