CN114584989A - Wireless communication device and packet protection method - Google Patents

Abstract

A wireless communication device and packet protection method, the wireless communication device, used in a sending end of a wireless communication system, includes a wireless analog transmitting unit for transmitting a data packet in a data transmission channel; and a packet generating unit for generating a data packet and at least one protection packet; before the data packet is transmitted on the data transmission channel, the wireless communication device transmits at least one protection packet on at least one adjacent channel of the data transmission channel to indicate that at least one user of the at least one adjacent channel stops using the at least one adjacent channel before the data packet is transmitted, and the frequency band of the at least one adjacent channel is overlapped with the frequency band of the data transmission channel.

Description

Wireless communication device and packet protection method

Technical Field

The present invention relates to a wireless communication device and a packet protection method for a transmitting end of a wireless communication system, and more particularly, to a wireless communication device and a packet protection method for protecting packets transmitted in adjacent channels with overlapping frequency bands to avoid collision between data packets in the adjacent channels and a data transmission channel.

Background

In Wireless communication systems (Wireless communication), a protection mode is usually used to reduce the possibility of collision with other users before transmitting data packets; for example, in the 802.11 specification, Request To Send (RTS), Clear To Send (CTS), or Clear to send (CTS 2Self) are all protection mode methods, and a specific Network Allocation Vector (NAV) time can be taken into each of these types of packets, and the NAV time is announced to inform the surrounding users that the next time will be used. For example, the NAV time announcement of 3.5ms in RTS represents that the time of 3.5ms from the beginning of RTS packet is the time that the packet cannot be sent, i.e. the state of "occupied" of the same channel is considered. The essence of the protection mode is that before the data packet is sent, a prompt packet is sent to inform the surrounding users not to use the channel, so as to achieve the purpose of protecting the transmitted data.

However, in a free frequency band used by WiFi such as 2.4GHz, the distance between each used channel is 5MHz, only three channels in the whole frequency band are completely staggered under the use of 20MHz and do not affect each other, and under general use, 5MHz to 15MHz overlap (5 MHz to 35MHz overlap under the use of 40 MHz) of adjacent channels is encountered, and the overlapping signals cannot be demodulated and can be regarded as noise to affect the use of the channels, so that the collision behavior can not be avoided under 2.4 GHz.

In view of the above, there is a need for improvement in the prior art.

Disclosure of Invention

Therefore, the primary objective of the present invention is to provide a wireless communication device and a packet protection method capable of sending a protection packet in an adjacent channel with overlapping frequency bands to avoid collision of data packets in the adjacent channel and a data transmission channel.

The invention discloses a wireless communication device, which is used at a sending end of a wireless communication system and comprises a wireless analog sending unit, a data packet sending unit and a data packet receiving unit, wherein the wireless analog sending unit is used for sending a data packet on a data transmission channel; and a packet generating unit for generating a data packet and at least one protection packet; before the data packet is transmitted on the data transmission channel, the wireless communication device transmits at least one protection packet on at least one adjacent channel of the data transmission channel to indicate that at least one user of the at least one adjacent channel stops using the at least one adjacent channel before the data packet is transmitted, and the frequency band of the at least one adjacent channel is overlapped with the frequency band of the data transmission channel.

The invention also discloses a packet protection method, which is used for a sending end of a wireless communication system and comprises the steps of generating a data packet and at least one protection packet; before a data transmission channel transmits a data packet, transmitting at least one protection packet on at least one adjacent channel of the data transmission channel to indicate at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before the data packet is transmitted; and transmitting the data packet on the data transmission channel through a wireless analog transmitting unit; the frequency band of at least one adjacent channel of the wireless communication device is overlapped with the frequency band of the data transmission channel.

Drawings

Fig. 1 is a diagram of a wireless communication device according to an embodiment of the invention.

Fig. 2 is a schematic diagram of frequency spectrums of a data packet and a protection packet according to an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating an operation of the wireless communication device shown in fig. 1 according to an embodiment of the present invention.

Fig. 4 is a diagram of another wireless communication device according to another embodiment of the invention.

Fig. 5 is a diagram of another wireless communication device according to another embodiment of the invention.

Fig. 6 is a diagram of another wireless communication device according to another embodiment of the invention.

FIG. 7 is a diagram illustrating frequency spectrums of a data packet and a protection packet according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a packet protection process according to an embodiment of the invention.

Detailed Description

For the 2.4GHz microwave band, the protocol of 802.11a/b/g/n/ax specifies more than ten channels on the 2.4GHz band, each channel has a bandwidth of 20MHz and overlaps with each other, most wireless communication systems, whether they are Orthogonal Frequency Division Multiplexing (OFDM) or Spread Spectrum (SS) systems, generally do not have the capability of demodulating packets on adjacent channels, and therefore the probability of collision is greatly increased because the packets on the overlapping channels cannot be demodulated correctly. For example, if there is a transmitter a on Ch1 transmitting, and there is a transmitter B on Ch2 or Ch3, the transmitter a could transmit packets at the orthogonal frequency division multiplexing 54M physical rate (phy rate) to allow the receiver to receive the packets, and the Packet Error Rate (PER) counted by the transmitter a can be within 10% to meet the requirements of the specification. However, once the transmitting device B on the adjacent channel Ch2 or Ch3 starts to transmit packets, the transmitting device a cannot demodulate the packet data on the adjacent channel Ch2 or Ch3, so that the transmitting device a may mistakenly assume that the channel is idle and transmit packets, and the packets may not be correctly received at this time, which may increase the packet error rate and affect the quality of the transmitted data. If the transmitting device a sends the RTS/CTS or CTS2Self packets for protection before transmitting data according to the 802.11 protection mode, the transmitting device B cannot recognize the RTS/CTS or CTS2Self packets and still transmits the packets due to the band shift between the transmitting device a and the transmitting device B of 5MHz, 10MHz or 15MHz, in this case, collision still occurs, in other words, the RTS/CTS packets cannot completely protect the data packets.

Therefore, for a sending end of a wireless communication system, the present invention provides a wireless communication device, which can transmit at least one protection packet on at least one neighboring channel of a data transmission channel before a data packet is transmitted on the data transmission channel, so as to instruct at least one user of the at least one neighboring channel to stop using the at least one neighboring channel before the data packet is completely transmitted, wherein a frequency band of the at least one neighboring channel overlaps with a frequency band of the data transmission channel. Therefore, in the microwave frequency band with higher channel overlapping degree, the invention can send the protection packet which can be solved by the user of the adjacent channel at the adjacent channel, and further the user of the adjacent channel can not send the packet to collide with the data packet of the data transmission channel, thereby achieving the optimal transmission efficiency.

Specifically, referring to fig. 1, fig. 1 is a schematic diagram of a wireless communication device 100 according to an embodiment of the invention. As shown in fig. 1, the wireless communication apparatus 100 is used at a transmitting end of a wireless communication system, and includes a wireless analog transmitting unit 120 connected to an antenna 110, a baseband processing unit 130 connected to the wireless analog transmitting unit 120, and a packet generating unit 140. The Packet generating Unit 140 may be a Micro-Control Unit (MCU), a Central Processing Unit (CPU), or a Media Access Control (MAC) layer Packet generator (Packet generator). Briefly, the wireless analog transmitter 120 transmits a data packet DP through a data transmission channel DC, and the packet generator 140 generates the data packet DP and the protection packets PP 1-PPN, performs digital modulation processing through the baseband processor 130, converts the data packet DP and the protection packets PP 1-PPN into corresponding channels through the wireless analog transmitter 120, and transmits the channels to the air through the antenna 110. In this case, before the data packet DP is transmitted on the data transmission channel DC, the wireless communication device 100 transmits the protection packets PP 1-PPN on the adjacent channels AC 1-ACN of the data transmission channel DC to instruct at least one user of the adjacent channels AC 1-ACN to stop using the adjacent channels AC 1-ACN before the data packet DP is completely transmitted, wherein the frequency bands of the adjacent channels AC 1-ACN overlap with the frequency band of the data transmission channel DC. Therefore, in the microwave frequency band with higher channel overlapping degree, the invention can send the protection packet which can be solved by the user of the adjacent channel at the adjacent channel, and further the user of the adjacent channel can not send the packet to collide with the data packet of the data transmission channel, thereby achieving the optimal transmission efficiency.

In detail, the baseband processing unit 130 may include an Offset bandwidth unit 150, and when the protection packets PP 1-PPN transmitted by the adjacent channels AC 1-ACN of the data transmission channel DC are to be transmitted, the digital frequency shift unit 150 is activated and converts the protection packets PP 1-PPN into frequency shift packets, and performs digital frequency shift processing to shift the protection packets PP 1-PPN on a baseband frequency spectrum relative to the data packet DP. Specifically, referring to fig. 2, fig. 2 is a schematic diagram of frequency spectrums of a data packet DP and protection packets PP 1-PP 2 according to an embodiment of the present invention. As shown in fig. 2, after the packet generating unit 140 generates the data packet DP, the baseband processing unit 130 performs digital modulation, encoding, and other processing, and the digital frequency shift unit 150 is not activated, the wireless analog transmitting unit 120 loads the processed data packet DP (the baseband frequency is between-10 MHz and 10 MHz) to a center frequency Fc corresponding to the high frequency, and finally transmits the data packet DP through the antenna 110. Taking 802.11 as an example, the channel CH1 is located at 2412MHz center frequency, and the channel CH2 is located at 2417MHz center frequency, so if the wireless analog transmitter 120 operates on the channel CH2, the center frequency Fc is set to 2417MHz, and the channel of the data packet DP is 2407 to 2427 MHz.

In addition, after the packet generating unit 140 generates a protection packet PP1, the baseband processing unit 130 performs digital modulation, coding, and the like, if the digital frequency shifting unit 150 is activated, the protection packet PP1 is shifted by 5MHz in the forward frequency direction, and then the wireless analog transmitting unit 120 loads the processed protection packet PP1 (the baseband frequency is between-5 MHz and 15 MHz) to the center frequency Fc corresponding to the high frequency to become a frequency shifting packet, and due to the frequency shifting relationship, an equivalent center frequency Fc' transmitted by the processed protection packet PP1 and the real center frequency Fc are also shifted by 5 MHz. In other words, the processed protection packet PP1 can be regarded as having a center frequency Fc'. Therefore, the wireless communication device 100 originally transmits the data packet DP on the channel CH2 with the center frequency of 2417MHz, and after the processing by the digital frequency shift unit 150, the transmission becomes similar to the transmission of the protection packet PP1 on the channel CH3 with the center frequency of 2422MHz, so that the processed protection packet PP1 becomes a general packet that can be demodulated on the channel CH 3.

On the other hand, after the packet generating unit 140 generates another protection packet PP2, the baseband processing unit 130 performs digital modulation, coding, and the like, if the digital frequency shifting unit 150 is activated, the protection packet PP2 is shifted by 5MHz in the negative frequency direction, and then the wireless analog transmitting unit 120 loads the processed protection packet PP2 (the baseband frequency is between-15 MHz and 5 MHz) to the center frequency Fc corresponding to the high frequency to become a frequency shift packet, and due to the frequency shift, an equivalent center frequency Fc' transmitted by the processed protection packet PP2 and the true center frequency Fc are also shifted by 5 MHz. In other words, the processed protection packet PP2 can be regarded as having a center frequency Fc'. Therefore, the wireless communication device 100 originally transmits the data packet DP on the channel CH2 with the center frequency of 2417MHz, and after the processing by the digital frequency shift unit 150, the transmission becomes similar to the transmission of the protection packet PP2 on the channel CH1 with the center frequency of 2412MHz, so that the processed protection packet PP2 becomes a normal packet which can be demodulated on the channel CH 1. In circuit implementation, the digital frequency shift unit 150 can be implemented by a complex multiplier (exp (jwt)). In this way, the digital frequency shift unit 150 may perform the digital frequency shift processing to shift the protection packets PP 1-PPN in frequency spectrum relative to the data packet DP, such that at least one equivalent center frequency transmitted by the processed protection packets PP 1-PPN is equal to at least one center frequency of the adjacent channels AC 1-ACN, so as to transmit the protection packets PP 1-PPN on the adjacent channels AC 1-ACN without replacing the operating center frequency Fc.

Specifically, referring to fig. 3, fig. 3 is a schematic diagram illustrating an operation of the wireless communication device 100 shown in fig. 1 according to an embodiment of the present invention. As shown in fig. 3, in the 802.11 specification, the wireless communication device 100 as the transmitting end may send an RTS packet 320 as protection before transmitting the data packet DP, and the receiving end replies a CTS packet 310 indicating that the channel is in a clear state. The RTS packet 320 carries NAV time, which represents the time that the transmitting end is about to occupy the channel (i.e., the time required to indicate the completion of the data packet DP transmission). In this case, the present invention transmits protection packets PP 1-PPN for protection before the RTS packet 320, where the protection packets PP 1-PPN may be CTS2self packets, the protection packets PP 1-PPN may be shifted to positive frequency such as protection packet PP1 or shifted to negative frequency such as protection packet PP2, and each protection packet PP 1-PPN has a different frequency. The NAV time is also carried in the protection packets PP 1-PPN, which represents the time that the wireless communication device 100 as the transmitting end will occupy the channel (i.e. indicating at least one user of at least one neighboring channel to stop using at least one neighboring channel before the data packet DP is completely transmitted), and the NAV time is utilized to contend for the data packet DP to be transmitted without collision with other packets.

It is noted that the above embodiments of the present invention mainly transmit the protection packets PP1 PPN on the neighboring channels AC1 ACN of the data transmission channel DC to instruct at least one user of the neighboring channels AC1 ACN to stop using the neighboring channels AC1 ACN before the transmission of the data packet DP is completed, so as to avoid collision. It is not limited thereto but may be modified or changed by those skilled in the art. For example, only two protection packets PP 1-PP 2 are shown in fig. 2 and fig. 3 to illustrate that, in practical operation, when the WiFi channel bandwidth is 20MHz, the channel and the front and back three channels may have frequency band overlapping (i.e. the channel Ch4 overlaps with the channels Ch 1-Ch 3, Ch 5-Ch 7), so that 6 protection packets can be sent to avoid collision (14 protection packets can be sent in the case of 40MHz channel bandwidth). In addition, the Ch3 and Ch1 corresponding to the protection packets PP1 and PP2 respectively are transmitted in a time-sharing manner as shown in fig. 3 because of the overlapping frequency bands, but if there is no overlapping frequency band in the adjacent channels transmitted by the protection packets, the protection packets can also be transmitted simultaneously (e.g. simultaneously transmitting the non-overlapping protection packets in the non-overlapping adjacent channels Ch2 and Ch 6).

In addition, referring to fig. 4, fig. 4 is a schematic diagram of a wireless communication device 400 according to an embodiment of the invention. Similar components and functions of the wireless communication device 400 and the wireless communication device 100 are denoted by the same symbols, and the operations thereof can be referred to the above description, which is not repeated herein for brevity. The main difference between the wireless communication device 400 and the wireless communication device 100 is that a baseband processing unit 430 of the wireless communication device 400 performs digital modulation processing without frequency shifting, and a wireless analog transmitting unit 420 of the wireless communication device 400 further includes an analog frequency shifting unit 450, when the protection packets PP 1-PPN are to be transmitted, the analog frequency shifting unit 450 is activated and converts the protection packets PP 1-PPN into frequency shifting packets according to at least one center frequency of the adjacent channels AC 1-ACN, so that the protection packets PP 1-PPN are shifted on a radio frequency spectrum and transmitted on the adjacent channels AC 1-ACN. In circuit implementation, the analog frequency shift unit 450 can be implemented by a carrier frequency control unit to achieve the effect of sending frequency shift packets (e.g., the baseband frequency of the protection packet PP1 is the same as the data packet DP, and the carrier frequency of the protection-only packet PP1 is direct

On the other hand, referring to fig. 5, fig. 5 is a schematic diagram of a wireless communication device 500 according to an embodiment of the invention. Similar components and functions of the wireless communication device 500 and the wireless communication device 100 are denoted by the same symbols, and the operations thereof can be referred to the above description, and are not repeated herein for brevity. The main difference between the wireless communication device 500 and the wireless communication device 100 is that the wireless communication device 500 further includes an environment detection unit 560 coupled to the wireless analog transmitting unit 120 and the packet generating unit 140, and the environment detection unit 560 can detect the usage of the environment channel. When other devices in the environment are using the neighboring channels AC 1-ACN, the environment detection unit 560 may notify the packet generation unit 140 to send the protection packets PP 1-PPN for protection before the packet generation unit 140 transmits the data packet DP, so that the data packet DP will not collide with the packets sent by other devices in the neighboring channels AC 1-ACN. For example, after detecting the environmental channels, the environment detection unit 560 may send the protection packets PP1 and PP2 only on the channels CH1 and CH3 for protection if only the channels CH1 and CH3 have energy responses and determine that other devices are in use.

On the other hand, referring to fig. 6, fig. 6 is a schematic diagram of a wireless communication device 600 according to an embodiment of the invention. Similar components and functions of the wireless communication device 600 and the wireless communication device 100 are denoted by the same symbols, and the operations thereof can be referred to the above description, which is not repeated herein for brevity. The main difference between the wireless communication device 600 and the wireless communication device 100 is that the wireless communication device 600 further comprises a frequency hopping protection unit 650, which comprises an antenna 610, a frequency hopping protection baseband processing unit 631, and a frequency hopping protection wireless analog transceiver unit 621, wherein the frequency hopping protection unit 650 has its own independent transmitting unit, therefore, it is possible to transmit packets on any channel, and when the packet generation unit 140 is to send the data packet DP, knowing the currently used data transmission channel DC and the bandwidth, the frequency hopping protection wireless analog transceiving unit 621 moves to the center frequency of the adjacent channels AC 1-ACN within the bandwidth coverage of the data transmission channel DC used by the wireless analog transmitting unit 120, and cooperatively transmit a protection packet PP 1-PPN (e.g., RTS or CTS-to-Self) to announce that the data transmission channel DC will be used next to avoid overlapped frequency collision. In this way, by adding the frequency hopping protection unit 650, the present invention can send the protection packet that can be solved by the user of the adjacent channel in the microwave frequency band with higher channel overlapping degree, so that the user of the adjacent channel can not send the packet to collide with the data packet of the data transmission channel, thereby achieving the preferred transmission performance.

Referring to fig. 7, fig. 7 is a schematic diagram of frequency spectrums of a data packet DP and a protection packet PPx according to an embodiment of the present invention. As shown in fig. 6 and 7, taking 802.11 as an example, the center frequency of the channel CH1 is 2412MHz, and the center frequency of the channel CH3 is 2422MHz, so if the wireless analog transmitter 120 operates on the channel CH1, the center frequency Fc is 2412 MHz. If the frequency hopping protection unit 650 is activated and jumps to the center frequency of the channel CH3 using the channel CH1 band edge, after the packet generation unit 140 generates a protection packet PPx, the frequency hopping protection baseband processing unit 631 performs digital modulation, coding, etc., and jumps to the center frequency Fc +10MHz of the wireless analog transmission unit 120 through the frequency hopping protection wireless analog transceiver unit 621. In other words, the protection packet PPx transmits packets at a frequency of Fc + 10. Therefore, the data packet DP, which originally operates on the channel CH1 and has the center frequency of 2412MHz, and the corresponding protection packet PPx, which has the center frequency of 2412MHz, becomes a protection packet PPx with the center frequency of 2422MHz after the cooperation of the frequency hopping protection unit 650, and operates on the user of the channel CH3, so that the protection packet PPx can be correctly demodulated, the transmission of the packet is stopped within the protection time, and the collision with the user of the channel CH1 is avoided.

In this case, the timing for transmitting the protection packets PP 1-PPN by the wireless communication device 600 is substantially similar to the timing for transmitting the protection packets PP 1-PPN by the wireless communication device 100 shown in fig. 3, and the related operations and variations can be referred to above (i.e. the protection packet PPx can be transmitted on the channel CH3 first, and then the RTS packet 320, the CTS packet 310 and the data packet DP are transmitted on the channel CH 1), which is not described in detail herein for brevity. In addition, since the frequency hopping protection wireless analog transceiver 621 included in the frequency hopping protection unit 650 can monitor any channel to detect the usage of the environmental channel, it can have a similar function as the environmental detection unit 560 shown in fig. 5, when there are other devices in the environment using the neighboring channels AC 1-ACN, the frequency hopping protection unit 650 can notify the packet generation unit 140 to let the packet generation unit 540 send the protection packets PP 1-PPN for protection before transmitting the data packet DP, so that the data packet DP will not collide with the packets sent by other devices neighboring channels AC 1-ACN.

Therefore, the packet protection operation of the wireless communication device 100 can be summarized as a packet protection process 80, as shown in fig. 8, which includes the following steps:

step 800: and starting.

Step 802: a data packet and at least one protection packet are generated.

Step 804: before a data transmission channel transmits the data packet, transmitting the at least one protection packet on at least one adjacent channel of the data transmission channel to indicate at least one user of the at least one adjacent channel to stop using the at least one adjacent channel before the data packet is transmitted.

Step 806: transmitting the data packet on the data transmission channel through a wireless analog transmitting unit; wherein a frequency band of the at least one adjacent channel of the wireless communication device overlaps with a frequency band of the data transmission channel.

Step 808: and (6) ending.

The detailed operation of the packet protection process 80 can refer to the related contents of the wireless communication device 100, and is not described herein for brevity.

In summary, in the microwave frequency band with higher channel overlapping degree, the present invention can send out the protection packet that can be solved by the user of the adjacent channel in the adjacent channel, so that the user of the adjacent channel can not send out the packet to collide with the data packet of the data transmission channel, thereby achieving the preferred transmission performance.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

[ notation ] to show

100. 400, 500, 600: wireless communication device

110. 610: antenna with a shield

120. 420: wireless analog transmitting unit

130. 430: base frequency processing unit

140: packet generation unit

150: digital frequency shift unit

320: RTS packet

310: CTS packet

450: analog frequency shift unit

560: environment detection unit

650: frequency hopping protection unit

621: frequency hopping protection wireless analog transceiver unit

631: frequency hopping protection base frequency processing unit

80: flow path

800-808: step (ii) of

DP: data packet

PP 1-PPN: protection package

CH 1-CH 3: channel with a plurality of channels

Fc: center frequency

Fc': the equivalent center frequency.

Claims (10)

1. A wireless communication device for a transmitting end of a wireless communication system, the wireless communication device comprising:

a wireless analog transmitter unit for transmitting a data packet over a data transmission channel; and

a packet generating unit for generating the data packet and at least one protection packet;

before the data packet is transmitted through the data transmission channel, the wireless communication device transmits the at least one protection packet through at least one adjacent channel of the data transmission channel to indicate that at least one user of the at least one adjacent channel stops using the at least one adjacent channel before the data packet is transmitted, and the frequency band of the at least one adjacent channel is overlapped with the frequency band of the data transmission channel.

2. The wireless communication device of claim 1, further comprising a baseband processing unit for performing digital modulation processing on the data packet and the at least one protection packet, the baseband processing unit comprising:

a digital frequency shift unit for performing digital modulation processing to shift the at least one protection packet relative to the data packet on a baseband frequency spectrum.

3. The wireless communications device as claimed in claim 2, wherein at least one equivalent center frequency of the at least one protection packet transmitted after being processed by the digital frequency shift unit is equal to at least one center frequency of the at least one neighboring channel.

4. The wireless communication device of claim 2, wherein the digital frequency shift unit is a complex multiplier.

5. The wireless communications device according to claim 1, wherein the wireless communications device simultaneously transmits at least one non-overlapping protection packet of the at least one protection packet in at least one non-overlapping adjacent channel of the at least one adjacent channel, the frequency bands of the at least one non-overlapping adjacent channel being non-overlapping.

6. The wireless communication device of claim 1, wherein the wireless analog transmitter unit comprises:

an analog frequency shift unit for shifting the at least one protection packet relative to the data packet over a radio frequency spectrum according to at least one center frequency of the at least one adjacent channel.

7. The wireless communication device of claim 1, further comprising:

an environment detection unit, coupled to the wireless analog transmission unit and the packet generation unit, for detecting the usage of a plurality of environment channels;

wherein the at least one adjacent channel is a channel in use among the plurality of environmental channels.

8. The wireless communication device of claim 1, further comprising:

a frequency hopping protection unit, which comprises a frequency hopping protection wireless analog transmitting unit used for transmitting the at least one protection packet in the at least one adjacent channel according to the at least one center frequency of the at least one adjacent channel.

9. The wireless communication device as claimed in claim 8, wherein the frequency hopping protection wireless analog transmitting unit detects usage of a plurality of environmental channels, and the at least one neighboring channel is a channel being used in the plurality of environmental channels.

10. A packet protection method for a sender of a wireless communication system, the method comprising:

generating a data packet and at least one protection packet;

transmitting the at least one protection packet on at least one neighboring channel of a data transmission channel before the data packet is transmitted on the data transmission channel to instruct at least one user of the at least one neighboring channel to stop using the at least one neighboring channel before the data packet is transmitted; and

transmitting the data packet on the data transmission channel through a wireless analog transmitting unit;

wherein the frequency band of the at least one adjacent channel of the wireless communication device overlaps with the frequency band of the data transmission channel.

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