TW569562B - Method for receiving radio signals with an access point - Google Patents

Abstract

A method for receiving radio frequency signals transmitted by a radio signal transmitter with an access point is disclosed. The access point includes a processor and a plurality of antennas. The method includes following steps: using the plurality of antennas to receive radio signals transmitted by the radio signal transmitter and radio signals transmitted from other directions during a predetermined time period, and using the process to sum up radio signals received by the plurality of antennas during the predetermined time period to obtain a summation of radio signals transmitted by the radio signal transmitter and directly transmitting to the access point and of radio signals transmitted by the radio signal transmitter but reflected to the access point.

Description

569562

Field of the invention: = j bridges receive radio wireless marriage & __ _, receive a wireless message. The present invention provides a method, especially a method using _ 使用 network. The transmission device is directly transmitted to the wireless network bridge 2 = 妾 「" ..., ^, and the transmission device is transmitted to the wireless network through reflection; ^ technical crying also can not cure the total number. J 略Background of the invention of bridging wireless telecommunications

In the past decade, the spread spectrum technique (co-Channei interference) and anti-interception (l0w probability of intercept (LPI)) characteristics have gradually become the most ideal wireless One of the communication methods. Spread spectrum communication can be applied to wireless local area networks (computer-to-computer local area networks), bar code scanners, mobile phones, and even the latest personal communication networks / personal communication services (pers ο na 1 communication network / personal communication service (PCN / PCS) communication technology and other different electronic communication fields.

The main difference between spread spectrum communication and general communication is that when transmitting and receiving a message, the spread spectrum communication needs to undergo two modulation / demodulation procedures, regardless of whether the signal is a digital signal or an analog signal. Signal. Spread Spectrum Communications

Page 5 569562 5. The spread spectrum methods used in the description of the invention (2) are roughly divided into two types: one is a direct sequence spread spectrum (DSSS) method, and the other is a 5 megahertz frequency modulation method ( frequency hopping spread spectrum (FHSS). The following uses direct sequence modulation as an example to describe the operation of a spread spectrum communication system. Please refer to Figure 1. Figure 1 is a functional block diagram of the conventional spread spectrum communication system 10. The spread spectrum communication system 10 includes a modulation terminal 12 and a demodulation terminal 22. The modulation terminal 12 includes a secondary modulator 14, a balance modulator (BM) 16, and a first PN. (pseudo number) code generator 18 and a first antenna 20; the demodulation end 22 of the spread spectrum communication system 10 includes a secondary demodulator 24, a despreading demodulator 26, and a second The PN code generator 28, a second antenna 30, a band pass filter (BNP) 32, and a comparator 34. . The operating mode of the modulation terminal 1 2 of the spread spectrum communication system 10 is described as follows: The primary modulator 1 4 performs general (analog or digital) according to the nature of the input signal input from the input terminal of the modulation terminal 12 Analog communication (ana 1 0g communication, AC) modulation or digital communication (DC) modulation. If the input signal input at the input terminal of the modulation terminal 12 is an analog signal, the primary modulator 1 4 The modulation method used is FM or PM. Conversely, the primary modulator 14 uses pulse-code modulation (PCM) or binary phase shift keying (BPSK). Modulation method to modulate the input signal. The balance modulator 16 is used to perform the secondary adjustment of the modulation terminal 12

569562 V. Description of the invention (3) Function of change. The function of secondary modulation is to greatly expand the spectrum (frequency) of an input signal. If the input signal is an analog signal, the work of secondary modulation It is completed by the first PN code generator 18, but if the input signal is a bit signal, the balance modulator 16 uses a scramble method to modulate the input signal. The so-called The code scrambling method is generated after the input signal (digital) is modulated by a modulator 1 4 in a PCM modulation method. 'The modulated input signal and the first p N code generator 18 are generated ^ After doing multiplication operations to generate a random digital code, it is then incremented by a carrier, wherein the process of multiplying the modulated input signal by the PN code is spreading. Finally, the modulation and spreading After that, the input signal can be sent out via the first antenna 20. In the next two days, there is no change in the generator, and there is no later demultiplexer. The initial output is the line 30 of the demodulation terminal 22 of the anti-spread spectrum communication system 10. Receiving the radio signal from the modulation terminal ίίϋ; 2 ° sends out the code generated by the modulation 28; the spreader 26 uses the second PN code to generate the square code, Θ ^ the radio signal received by the antenna 30 ^ t tfi ^ ^ ί ί f I f ^ ^ ^ ^ ^ Again) the anti-diffusion relay 34 (function of the comparator 34) passes the anti-diffusion signal through the wave filter 32, and the band pass modulator 24 then ζ Intermediate frequency signal, the second signal transmitted from demodulation terminal 22 to demodulation terminal 22 is demodulated into a base frequency signal and the base is input to modulation terminal 12 in Yushanyu. In theory, the base frequency signal In the most divergent process, the signals of two, two, and two rounds of human signals should be the same. In the above, special attention is paid to the second PN code generator 28 and the first PN code generator 28.

569562 V. Description of the invention (4)-The PN code generator 18 must have a high degree of correlation; that is, the pN code generated by the generator 28 must be completely consistent with the first pN code generator. Multiply the flood received by the anti-diffusion demodulator M of the demodulation end 22 by the same to restore the original turn. It also needs to go through the BFP32 and the secondary demodulator 24) 0 Koda, please refer to Figure 2A to Figure 2C, the spectrum change of the signal of the communication system 10 is entered in the spread spectrum communication system 10 before the signal passes through the spectrum of the spread spectrum signal of the modulation terminal of the spread spectrum communication system 10, and the signal of the second spectrum The figure after demodulation of the spread spectrum signal. It can be seen from Fig. 2A to Fig. 2C that after the spectrum is transformed into a flat signal after spreading, the signal will be restored. The signals 2A to 2C are input to the spread spectrum. Among them, Figure 2A is the spectrum of the signal output. Figure 2B is the signal 12 and it is adjusted to a spread spectrum signal. C is the spectrum of the demodulation terminal 22 receiving the spread spectrum demodulated spectrum signal. The signal will pass after the spread spectrum, and the flat signal will pass through. Generally speaking, the spread spectrum signal will inevitably be interfered by noise during the process of being transmitted by the spread spectrum communication system 10. The advantages of the high-frequency communication system 10 were demonstrated at this time. Please refer to FIG. 3A to FIG. 3D, and FIGS. 3A to 3D illustrate how the spread spectrum communication system can avoid the interference of noise. Among them, Figure 3A is the spectrum of the signal to be transmitted, Figure 3B is the spectrum of the signal after the spread spectrum communication system 10 spread spectrum, and Figure 3C is the signal of the § Hai spread spectrum. The spectrum diagram of the interfered signal after the signal interference 'and Figure 3D shows the signal after the interference is de-diffused.

569562 V. Description of the invention (5) Spectrum diagram of anti-diffusion signal. As can be clearly seen in Figures 3A to 3D, after the noise that interferes with the spread-spectrum signal undergoes the process of anti-diffusion, the signal strength of the anti-diffusion noise and the signal of the signal to be transmitted The intensity is already insignificant compared, so the spread spectrum communication system 10 can indeed achieve the "anti-interference" characteristics mentioned earlier. The DSSS technology is to expand "1" or "〇" in an original signal to more than 10 spreading codes (S preading Co.de) to spread signals with a bandwidth of tens or hundreds of times. (In the application of national defense, the bandwidth of the original signal has even been increased to one million times), so that the original higher power, narrower frequency is transformed into a lower power signal with a wider bandwidth, even lower than the background noise. Signal Noise (Background Noise). In this way, it is difficult for people who are interested in getting information to judge the real signal, so as to achieve the purpose of 'anti-interception.' A spread-spectrum code with more digits has stronger anti-noise interference, but a spread-spectrum code with less digits can increase the number of users. Basically, the number of spreading codes used in DSSS is not large. For example, the spreading codes used in almost all 2.4 GHz wireless LAN products

The number of digits is less than 20. The direct sequence spreading of IEEE "^ 丨 uses the 11-chips spreading code (also known as the virtual noise code PseudON technology) with a spreading code of 1 丨 -chips. The interpolation of fcc-said s-frequency code The number of digits must be greater than 10, and it is known from experiments that most, 疋 疋 Λ ^ 1 〇 ^

569562 Fifth, the invention description (6) " can be restored to the original signal. The so-called processing is, in fact, a correlation between the radio signal received by the second antenna 3 2 of the demodulation end 22 and the pn code generated by the second pN code generation key 2 8 (c 〇rere 1 a η ON) operation. aw Ming, referring to Figure 1, the de-diffusion demodulation in Figure 1 of the spread spectrum communication system 10 is 2 6 can be used to perform the above correlation operation (the correlation component can also be called a coupled filter matched f丨 1]. Off j = f is used for signal identification (Slgnal acquisiti〇n), when-operation λ: the tone adjuster 26 will periodically (usually every-弋 1 硐 jealousy-f code generator 28) The generated PN code is bit-wise for this modulation and diffusion. The green light thunder is made on the radio signal for 3 days. J is identified by the radio signal of '2 sexual movements' and the right is the modulation diffusion-A M, I. The identification code of 2 Γ is completely consistent with the PN code (coupling. The anti-diffusion demodulator 26 will generate a rr-pulse-received radio signal to confirm the pulse wave to indicate the demodulation terminal number. Instead of the radio signal sent from the modulating terminal 12 from outside, refer to FIG. 3D again. After the demodulating terminal & spread spectrum signal, the demodulating terminal 2 2 is used for the second antenna 30 to receive a signal. Demodulate the spread spectrum signal into the signal shown in Figure 3 σ. When the peak value of the signal of the relevant circuit of the Hai spread spectrum signal is greater than ^ — In the middle of D, the terminal 2 2 knows that when it receives the pre-set value P of the exhibition a (combined), it is solved. If the peak value of the signal in Fig. 3 D is indeed the modulation terminal 1 2 The transmission signal is ignored. Since the solution is smaller than the predetermined value, the demodulation terminal 24 and the 2 2 receive are directly controlled by the modulation terminal i 2.

569562 V. Description of the invention (7) The spread spectrum signal is transmitted, so the Wei symbol in Figure 3D has only one wave number which is the predetermined value. ^, ^ However, in recent years, as the spread spectrum technology has become more mature, electronic communication products using spread spectrum technology as a communication means have also increased, and some of these products will be used in indoor environments, such as Such as ^ electric home or wireless network bridge (access point, AP) and so on. When these mobile phones or APs receive a radio signal transmitted from the base station indoors, 'these mobile phones will not only receive radio signals transmitted directly from the base station', these mobile phones will also receive radio signals transmitted by the base station but reflected from Other indoor radio signals (also known as mul tipath). However, because the demodulation terminal 2 2 of the conventional spread spectrum communication system 丨 0 only receives the spread spectrum signal with the maximum power level (of course, the power level of the spread spectrum signal must exceed the predetermined value), and it is ignored by the multiple paths. The spread-spectrum signal of the demodulation terminal 2 2 is transmitted. Therefore, the signal-to-noise ratio (SNR) of the radio signal received by the demodulation terminal 2 2 of the spread-spectrum communication system 10 is known. Usually not too high. OBJECTS AND SUMMARY OF THE INVENTION Therefore, the purpose of the present invention is to provide a method for receiving a radio signal using a wireless network bridge. The wireless network bridge: spread spectrum communication technology to receive and transmit the radio signal. ° ’, more useful

569562 V. Description of the invention (8) Antenna d: [method ::;: j :, ”The bridge contains a plurality of branches JJ = y and nothing from other directions ^ The special benefit line telecommunications Sa Λ i will be in the middle Received by several antennas ..., summed up to obtain the helmet line 丨 set up a team to judge all: the radio signal of the bridge and the u: JK 妾: to the wireless network wireless network bridge The wireless signal line transmission device transmits to the method of the present invention through reflection. Not only does the method of the present invention receive the beneficial radio signal, but also the method of the present invention receives directly from the device but receives the indirect transmission of the helmet line wireless transmission device. The method of transmitting signals can increase the wireless network bridge = ^ 'so the signal / noise ratio of the received radio signal is received. For a detailed description of the received radio signal invention, please refer to FIG. 4, which is a block diagram of the present invention. The difference between the functions of the spread spectrum communication system and the communication system 在于 is that the spread spectrum communication system 4 ^ knows that the spread spectrum communication system 10 is almost the same. The demodulation end 22 (due to the spread spectrum communication components) Numbering uses the spread spectrum communication system; ; The frequency communication system 40 yuan received by the modulation terminal 1 2 directly transmitted from the first module) not only connected to the radio signal 4 2, the demodulation terminal 2 2

569562 V. Description of the invention (9) It also receives the second radio signal 4 4 and the third radio signal 4 6 from the modulation terminal 12 but transmitted through one reflection, and the fourth radio signal from the second reflection. Radio signal 4 8 (the dotted line in Figure 4 shows the indoor environment where the wireless network bridge 80 is located). In addition, the demodulation terminal 22 of the spread spectrum communication system 40 further includes an accumulator 50 for accumulating signals whose power level is greater than a predetermined value among the signals output by the anti-diffusion demodulator 26. As shown in Fig. 4, the frequency converter 1 2 in the spread spectrum communication system 40 is used in a wireless transmission system 70 (not shown), and the demodulation terminal 2 2 is used in a wireless network. The bridge 80 (not shown), the wireless network bridge 80 includes a plurality of antennas for receiving radio signals. The radio signal transmitted from the wireless transmission device 70 to the plurality of antennas of the wireless network bridge 80 is a carrier wave, and the carrier wave refers to the εεεieee 8g2.iw terminal '; = 4 = 12 method: the spread spectrum communication system 40 The demodulation or indirectly by the modulation terminal ^ ί ^ Ergong 46, and 48 (regardless of direct power comparison, ^ ..., line Baoxun number) first pass the value of comparator 34, then the radio; Power: The power level of ί is greater than-predetermined radio signal. Please ϋ ϊ accumulate to accumulator 5q, m, ignore the 100, the flow chart 100 includes ^ ^ 25. The flowchart of the method of the present invention is step 102: start, 3 the following steps: (at this time, The wireless network connection 70 can be located indoors or it can be located indoors, while the wireless transmission device is outside, but the line transmission device 70 is transmitting and spreading.

569562, Description of the invention (10) Crossing the line and electricity (1 step radio signal) Step 110: Use a wireless network to bridge and cry in a period of time,-Receive directly from the wireless transmission device 70: J hard for several days The second wireless 5 m transmitted indirectly from other directions; fork power = signal 4 2 and signal 4 6 and fourth radio signal 4 8; ,, 4

The length of the 2H period is the radio's signal step 1 2 0: Use the wireless network to defeat the branch and suppress the heart JJ to disperse the first radio signal g = 80 in the anti-diffusion demodulator 26 (the second PN code is generated 1 to ^ 4 ^ wire signal (4 ^ input signal) code multiplied by the anti-diffusion demodulator 2 6 step 1 3 0: use wireless network 柊 _ demodulator 26 each round out state Comparator 34 in 80 compares the inverse spreading power level greater than a predetermined power level. If an output signal goes to the accumulator 50, Bayer 1 uses comparator 34 to output the output signal (because during this period, the A helmet 48 is synthesized into a radio signal, a U-disk of each output signal of the line signal U to the fourth radio signal device 26. Therefore, the comparator 34 compares the spectrogram of the anti-diffusion demodulation radio signal, In fact, the synthesized number is compared.) At the radio signal step HO corresponding to the predetermined value, the radio signal transmitted from the wireless network device 50 is added to the accumulator 50 of the state 80, which is accumulated by the comparison step 150: Use wireless network ^ IF radio signal 16〇 step: using a wireless network slightly pull holding bridge 80 of the second demodulator 24 in the

Step 569562 Description of the invention (11) The signal is demodulated into a baseband signal; Step 170: End. The present invention is the second antenna synthesizing standard, horizontal TOA) 0 to the same phase network number of the wireless radio. Sequentially, the centerline telecommunication corresponds to the scheduled telecommunication signal. The path difference bridge is synthesized as the first signal with the above. Please refer to the received spectrogram representative of the bridge—to the bridge. Figure 80, a wireless 48. The first to fourth in the signal are shown in Fig. 6 '. Fig. 6 The first to fourth radio signals of the first to fourth without the vertical column number 4 2, 4 4, and the first radio value, so only the totalizer 4 8 is added. Ignore it, it became the fourth 80th, the sixth after the Sixth Telecommunications appeared 46th, the signal had the 50th, so the four showed the first reached the wireless number 44, the four anti-diffusion solution peaks and 48. In 4 2 and the second radio, and the third radio is a radio representing the time number, there is no wireless network, and the three tuner. The four wireless signals, the radio signal line, and the network signal are synthesized. The telecom signal bridge line telecom 2 6 is the opposite of the crest telegraph signal 42 and the telegraph signal as examples to illustrate the power bit of arrival of the bridge 80 after the first post-diffusion number. There are no 4 2 first arriving at the radio signal 4 6 without 80, and the fourth diffusion effect, corresponding to the four nothings, because only 44 peaks are higher than a radio signal 4 6 and the fourth radio is compared. The conventional technology only receives the radio signal transmitted by the wireless. The method of the present invention not only receives the radio signal directly transmitted by J = 70, but also receives the radio signal transmitted by the wireless |: |

569562 V. Description of the invention (12) Set the radio signal transmitted by 70 but transmitted by reflection, as long as the power of the reflected radio signal is greater than a critical value. Therefore, using the method of the present invention to receive radio signals can indeed increase the signal / noise ratio of the received radio signals. The above description is only a preferred embodiment of the present invention, and any equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the invention patent.

Page 16 569562 Simple illustration of the diagram Simple illustration of the diagram Figure 1 is a functional block diagram of the conventional spread spectrum communication system. Figure 2A shows the spectrum of a signal before it is transmitted by the conventional spread spectrum communication system. Figure 2B is the frequency reading of the signal in Figure 2A after the terminal of the conventional spread spectrum communication system has been adjusted to a spread spectrum signal. Fig. 2C is a spectrum diagram of the demodulated signal of the demodulation terminal of the conventional spread spectrum communication system after receiving the spread spectrum signal in Fig. 2B after demodulating the spread spectrum signal. Figure 3A is a spectrum diagram of signals transmitted by a conventional spread spectrum communication system. 〇 Figure 3B is the spectrum of the signal in Figure 3A after spreading by the conventional spread spectrum communication system. Figure 3C is a spectrum diagram of the spread signal in Figure 3B after noise interference. Figure 3D shows the spectrum of the demodulated signal in Figure 3C after the demodulated signal is demodulated. FIG. 4 is a functional block diagram of the spread spectrum communication system of the present invention. Figure 5 is a flowchart of the method of the present invention. Figure 6 is a frequency spectrum diagram of a radio signal in a spread spectrum communication system of the present invention. Schematic symbol description

Page 17 569562 Brief description of the diagram 10, 40 Spread spectrum communication system 12 Modulation end 14 Primary modulator 16 Balanced modulator 18 First PN code generator 20 First antenna 22 Demodulation end 24 Secondary modulation Modulator 26 diffusion modulator 28 second PN code generator 30 second antenna 32 band-pass filter 34 comparator 42 first radio signal 44 second radio signal 46 second benefit line signal 48 fourth radio signal 50 accumulation 70-line fm device 80-line network bridge

Page 18

Claims (1)

569562 Shen Qing's patent scope includes several Ml road network access points to receive antennas, including: # 虎 方法, the wireless network bridge contains; ^ above j and a processor, The method includes: · wirelessly according to the source; ΐ: Ϊ: f JJ :: line to receive radio signals transmitted from the wireless transmission device using poems and other directions; and wire electrical ^ Γ Ξ device will During the period, all the bridges received by the plurality of antennas are ί1 ° to obtain that the wireless transmission device is directly transmitted to the wireless network cable network. ^ Ϊ́Telecommunication signals and Rong i-line transmission devices are transmitted to the tower bridge via reflection. The sum of radio news. Wheel loading ϊ! Ϊ The method described in the patent scope of the 'the wireless section', wherein the radio signals of the plurality of antennas are carrier waves, and the time length is the period of the carrier wave. The device ΪΓΐ specifically covers the method described in item 1, wherein the radio signal of the wireless transmission specification ΐ antenna refers to a carrier wave with a page rate of 2 · 4 G Η z at 1EEE 802.Hb. The method described in item 1 of the scope of patent application of the Dream Department, wherein the wireless transmission ‘范 之 ί ΐ ΐ several antennas are absent, and the telecommunication signal refers to a carrier wave with a frequency of 5.25GHz, which is 1ΕΕΕ 8 0 2.1 1 3.