KR100404385B1 - Signal processing method of wireless communication systems by using DSP and apparatus thereof - Google Patents

Abstract

The present invention relates to a signal processing method and apparatus for a wireless communication system using a DSP. After converting an RF signal of a transmitting and receiving end of a wireless communication system to digital, the original signal for each channel is extracted by a DSP, but the unnecessary signal is removed. The present invention relates to a signal processing method of a wireless communication system using a DSP capable of transmitting a good signal even in a long distance transmission through various transmission media and a signal processing apparatus of the wireless communication system using the same.

The present invention as described above, after converting the RF signal of the transmitting and receiving end of the wireless communication system to digital to extract the original signal for each channel by the DSP, but not only improve the communication quality, but also various transmission media It provides a signal processing method of a wireless communication system using a DSP that can transmit a good signal even in a long distance transmission.

In addition, the present invention, in the wireless communication system, after converting the RF signal of the transmitting and receiving end to digital, and extracts the original signal for each channel by the DSP to remove the unnecessary signal to improve the communication quality, the long distance through various transmission media Provided is a signal processing apparatus of a wireless communication system using a DSP that can improve a radio wave environment by transmitting a high quality signal from which unnecessary signals are removed during transmission.

Description

Signal processing method of wireless communication systems by using DSP and apparatus

The present invention relates to a signal processing method and apparatus for a wireless communication system using a DSP. After converting an RF signal of a transmitting and receiving end of a wireless communication system to digital, the original signal for each channel is extracted by a DSP, but the unnecessary signal is removed. The present invention relates to a signal processing method of a wireless communication system using a DSP capable of transmitting a good signal even in a long distance transmission through various transmission media and a signal processing apparatus of the wireless communication system using the same.

Since the wireless communication system according to the prior art generally filters the entire carrier band without filtering for each channel, there is a limit in improving the pass characteristic of the broadband SAW filter (hereinafter referred to as "band SAW" in the sense of passing the carrier band). You can't expect the signal. In addition, in the case of filtering for each channel (hereinafter, referred to as "channel SAW" in the sense of passing the channel), the channel SAW is required as many as the number of channels, which greatly increases the hardware cost.

In addition, even when a plurality of carriers use consecutive frequencies separately, the band SAW filter has a limited characteristic as described above, and thus there is a problem in that separation between neighboring carriers having a guard band is poor. In this state of poor separation or degradation of the input RF signal due to noise, intermodulation distortion (IMD) occurs because the adjacent adjacent signals are not completely removed, resulting in further degradation of the final output signal of the system. .

1 is a block diagram of a relay apparatus which is an embodiment of a wireless communication system according to the prior art, and FIG. 2 is a detailed block diagram showing the signal processing of FIG. The relay device 101 is to service a shadow area where radio waves do not reach by receiving and retransmitting an RF signal from the base station 100. In FIG. 2, the relay apparatus according to the related art suppresses out-of-band signals after the RF signal input from the base station is band-pass filtered and down-converted to the intermediate frequency (IF) by the first synthesizer 105. Bandpass filtered using band SAW filter 106, upconverted back to the RF signal by the first synthesizer and then transmitted to the shadow area.

3 is a detailed block diagram illustrating a case in which the apparatus of FIG. 2 is multi-channel. In FIG. 3, in the relay apparatus according to the related art, an RF signal input from a base station is branched by the number of channels by the distributor 115. The RF signal input to each channel is bandpass filtered, downconverted the desired channel to the intermediate frequency by the synthesizer, and then bandpass filtered using a channel SAW filter to suppress the out-of-channel signal, and then again by the synthesizer. Is upconverted to. The above process is performed in the first channel section 116 to the fourth channel section 119, respectively. In this way, the signal processed for each channel is synthesized again by the synthesizer 120 and then transmitted to the shaded area.

Input and output characteristics of the repeater according to the prior art as shown in FIG. FIG. 4 is a diagram illustrating input and output characteristics of a relay apparatus, which is an embodiment of a wireless communication system according to the prior art, and illustrates input and output characteristics when five channels are used. Since the band SAW filter is used as described above, the input signal is further deteriorated during the filtering process and the up and down conversion of the signal, so that there is no improvement effect of the signal waveform as shown in FIG. 4. In addition, in the case of using each channel SAW filter in the relay apparatus according to the related art, the filtering characteristics may be improved, but the system cost is greatly increased since the channel SAW and additional circuits are required as many as the number of channels. There is this.

The present invention is to solve the problems of the prior art as described above, by converting the RF signal of the transmitting and receiving end of the wireless communication system to digital and extracting the original signal for each channel by the DSP, but eliminates the unnecessary signal communication quality The purpose of the present invention is to provide a signal processing method of a wireless communication system using a DSP that can transmit a high quality signal even in a long distance transmission through various transmission media.

In addition, the present invention, in the wireless communication system, after converting the RF signal of the transmitting and receiving end to digital, and extracts the original signal for each channel by the DSP to remove the unnecessary signal to improve the communication quality, the long distance through various transmission media Another object of the present invention is to provide a signal processing apparatus of a wireless communication system using a DSP that can improve a radio wave environment by transmitting a high quality signal from which unnecessary signals are removed during transmission.

1 is a block diagram of a relay apparatus which is an embodiment of a wireless communication system according to the prior art.

2 is a detailed block diagram showing the signal processing of FIG.

3 is a detailed block diagram illustrating a case in which the apparatus of FIG. 2 is multichannel;

4 is a diagram illustrating input and output characteristics of a relay apparatus which is an embodiment of a wireless communication system according to the prior art.

5 is a block diagram of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

6 is a block diagram of a digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

7 is a block diagram of a digital receiver of a wireless communication system using a DSP according to the present invention.

8 is a block diagram of a digital transmitter of a wireless communication system using a DSP according to the present invention.

9 is a block diagram of an NCO in a wireless communication system using a DSP in accordance with the present invention.

10 is a detailed block diagram of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

11 is a block diagram of a first digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

12 is a block diagram of a transmission transmitter of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

13 is a block diagram of a second digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

14 is a block diagram of a transmission receiver of a signal processing apparatus of a wireless communication system using a DSP according to the present invention;

15 is a block diagram illustrating a time synchronization processing method of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

16 is a diagram illustrating input and output characteristics of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

FIG. 17 is a diagram illustrating a case in which a signal is close to thermal noise as an input / output characteristic of a signal processing device of a wireless communication system using a DSP according to the present invention; FIG.

18 is a diagram illustrating a case in which different communication methods are used as input / output characteristics of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

19 is a diagram illustrating a case where another operator is included in the middle of a band as an input / output characteristic of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

20 is a diagram illustrating a case in which a signal size is different for each channel as an input / output characteristic of a signal processing apparatus of a wireless communication system using a DSP according to the present invention.

FIG. 21 is a diagram showing an input signal waveform of a DSP stage of a signal processing apparatus of a wireless communication system using a DSP according to the present invention; FIG.

Fig. 22 is a diagram showing an output signal waveform of the DSP stage of the signal processing apparatus of the wireless communication system using the DSP according to the present invention.

* Explanation of symbols for the main parts of the drawings

100. Base station 101. Repeater

102, 201. Low Noise Amplifiers 103, 202. First Bandpass Filter

104, 203. First amplifier 105, 204. First mixer

106, 205. Band SAW filter 107, 206. Second amplifier

108, 207. First attenuator 109, 209. Oscillator

110, 213. Second mixer 111, 212. Third amplifier

112, 211. Second attenuator 113, 216. Second bandpass filter

114, 214. Fourth amplifier 115. Splitter

116. First channel section 117. Second channel section

118. Third channel section 119. Fourth channel section

120. Synthesizer 121. Fifth Amplifier

200. DSP unit 200-1. First digital processing unit

200-2. Second Digital Processing Unit 208. A / D Converter

210. D / A converter 215. Third attenuator

217. Fifth Amplifier 218. Sixth Amplifier

219. Digital Receiver 220. Digital Transmitter

221.Multiplexer 222.NCO

223. Digital Mixer 224. CIC Filter

225. First FIR Filter 226. Second FIR Filter

227.Resampler

229.Register 230.LUT

231. Transmission transmitter 232. Transmission medium

233. Transmission receiver 234. Serializer

235.Deserialiser 236.Elastic buffer

237.Overhead Generators

239. Demultiplexer 240. Subtractor

In order to achieve the above object, the present invention, in a wireless communication system for receiving an RF signal converted to an analog intermediate frequency signal and processing and converting the analog intermediate frequency signal back to an RF signal, the analog signal received RF signal Converting to an intermediate frequency; Converting the analog intermediate frequency signal into a digital signal; A third step of down-converting the digital signal into a baseband digital signal, passing an FIR filter to accurately filter only a frequency of a corresponding channel, and processing the DSP; A fourth step of converting the DSP processed digital signal into an analog intermediate frequency signal; And a fifth step of converting the analog intermediate frequency signal into an RF signal.

The first step includes low noise amplifying the received RF signal, bandpass filtering to remove a signal other than the required band, and downconverting the analog RF signal by a mixer.

The second step includes: SAW filtering to remove noise components included in the analog intermediate frequency signal, amplifying or attenuating the analog intermediate frequency signal to obtain a required gain, and by an A / D converter. Converting the analog intermediate frequency signal into a digital signal.

The third step includes downconverting the digital signal into a baseband digital signal (I signal and a Q signal) by an NCO and a digital mixer, and converting the downconverted baseband digital signal into harmonic components through CIC filtering. Removing a signal, filtering only a frequency of a corresponding channel by an FIR filter, adjusting a gain of an only filtered signal of the corresponding channel by an AGC block, and adjusting a signal received from the AGC block. Minimizing a sampling rate by a resampler.

The fourth step includes converting the DSP processed digital signal into an analog intermediate frequency signal by a D / A converter, and amplifying or attenuating the analog intermediate frequency signal to obtain a required gain.

The fifth step includes upconverting the analog intermediate frequency signal to an RF signal by a mixer, amplifying or attenuating the RF signal to obtain a required gain, and removing the signal other than the required band. Bandpass filtering the RF signal.

The present invention also converts the received RF signal to an analog intermediate frequency in a wireless communication system that receives an RF signal, converts the analog intermediate frequency signal into a signal, and processes the analog intermediate frequency signal. First processing means; Second processing means for converting the analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And fifth processing means for converting the analog intermediate frequency signal into an RF signal. The present invention also provides a wireless communication system for receiving an analog intermediate frequency signal and converting the signal into an RF signal. Second processing means for converting an analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And fifth processing means for converting the analog intermediate frequency signal into an RF signal. The present invention also relates to a wireless communication system that receives a digital signal and converts the RF signal into an RF signal. Third processing means for down-converting the signal into a baseband digital signal and passing the FIR filter to accurately filter only the frequency of the corresponding channel; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And fifth processing means for converting the analog intermediate frequency signal into an RF signal. The present invention also includes receiving an RF signal from a base station, converting the analog intermediate frequency signal into an analog intermediate frequency signal, and processing the analog intermediate frequency signal. A relay apparatus for converting a signal into an RF signal and transmitting the same, the relay apparatus comprising: first processing means for converting an RF signal received from the base station into an analog intermediate frequency; Second processing means for converting the analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And fifth processing means for converting the analog intermediate frequency signal into an RF signal.

The first processing means includes an apparatus for low noise amplifying the received RF signal, an apparatus for bandpass filtering to remove signals other than the required band, and an apparatus for downconverting the analog RF signal by a mixer.

The second processing means may include an apparatus for SAW filtering to remove noise components included in the analog intermediate frequency signal, an apparatus for amplifying or attenuating the analog intermediate frequency signal to obtain a required gain, and an A / D converter. Thereby converting the analog intermediate frequency signal into a digital signal.

The third processing means includes an apparatus for downconverting the digital signal into a baseband digital signal (I signal and a Q signal) by an NCO and a digital mixer, and harmonic components through the CIC filtering of the downconverted baseband digital signal. A device for removing a signal, an apparatus for filtering only a frequency of a corresponding channel by an FIR filter, an apparatus for adjusting a gain of a signal filtered only for the frequency of the corresponding channel by an AGC block, and a signal received from the AGC block. The apparatus includes a device for minimizing a sampling rate by a resampler.

The fourth processing means includes an apparatus for converting the DSP processed digital signal into an analog intermediate frequency signal by a D / A converter, and an apparatus for amplifying or attenuating the analog intermediate frequency signal to obtain a required gain.

The fifth processing means includes an apparatus for upconverting the analog intermediate frequency signal to an RF signal by a mixer, an apparatus for amplifying or attenuating the RF signal to obtain a required gain, and for removing a signal other than the required band. And an apparatus for bandpass filtering the RF signal.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a block diagram of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 5, the signal processing apparatus according to the present invention generally includes a first processing means 200A, a second processing means 200B, a third processing means 200C, a fourth processing means 200D, And fifth processing means 200E. The RF signal input in FIG. 5 is amplified in the first processing means 200A with the noise suppressed to the maximum by the low noise amplifier 201, so that only the required frequency band is filtered by the band pass filter 202 and the oscillator ( A local oscillation signal is received from 209 and down-converted to an intermediate frequency through the first synthesizer 204. In addition, the intermediate frequency signal is filtered in the second processing means 200B and converted into a digital signal by the A / D converter 208, and then the A / D converted signal is converted into the third processing means 200C. In the fourth processing means (200D) after the digital processing unit 200, the D / A converter 210 is converted into an analog signal again, and in the fifth processing means (200E), the second mixer 213 Up-converted. The upconverted signal is bandpass filtered and then amplified and transmitted.

6 is a block diagram of a digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 6, the digital processing unit 200 includes digital receivers 219 and digital transmitters 220, and the digital receiver and the transmitter are paired with each other to selectively process one channel.

7 is a block diagram of a digital receiver of a wireless communication system using a DSP according to the present invention. As shown in FIG. 7, the digital receiver 219 downwards a baseband signal (I and Q signal) through a digital mixer 223 and a signal having a phase difference of 90 ° output from a normally controlled oscillator (NCO) 222. Is converted. The down-converted I / Q signal removes harmonic components generated during the A / D conversion by a cascaded integrator combine (CIC) filter 224. This signal passes through the DIR FIR1 filter 225 and the FIR2 filter 226 to accurately filter only the frequency of the corresponding channel.

The filtered signal is then gain adjusted via an automatic gain control (AGC) block 227, where gain adjustment can be set to a specific gain value or methods that automatically adjust the gain to maintain a specific output value. The gain-adjusted signal is minimized through the resampler 228 to minimize the sampling rate of the signal. Since the sampling rate during A / D conversion is very high, it is very important to reduce the sampling rate of the signal by the resampler because the transmission amount is large when the signal is transmitted by the transmission medium or the like divided into the master and the slave.

8 is a block diagram of a digital transmitter of a wireless communication system using a DSP according to the present invention. As shown in FIG. 8, the digital transmitter 220 once again filters the signal received from the digital receiver through the FIR1 and FIR2 filters, filters through the CIC filter, and then upconverts the intermediate frequency through the NCO and the digital mixer. At this time, the real part and the imaginary part of the signal are processed separately.

9 is a block diagram of an NCO of a wireless communication system using a DSP according to the present invention. As shown in FIG. 9, the NCO has a frequency determined by a frequency control word (FCW) and uses an adder 228, a register 229, and a look up table (LUT) 230 including a quarter cycle cosine signal. To generate the sine and cosine signals of the required frequency.

10 is a detailed block diagram of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 10, the input RF signal is bandpass filtered and downconverted to an intermediate frequency through the PLL synthesizer and the first mixer. The intermediate frequency signal is band-pass filtered and A / D converted and then transmitted by the transmission transmitter 231 through the first digital processor 200-1. The transmitted signal is received through the transmission receiving unit 233 and passed through the second digital processing unit 200-2, and then converted into an analog signal again by D / A conversion and up-converted through the second mixer. The upconverted signal is bandpass filtered, amplified and then transmitted.

11 is a block diagram of a first digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 11, the first digital processing unit 200-1 includes digital receivers 219 and serializers 234. The serializers transmit baseband I / Qs from multiple digital receivers at high speed. Send to the transmitter. At this time, the role of the digital receiver is as described above with reference to FIG.

12 is a block diagram of a transmission transmitter of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 12, the transmission transmitter 231 receives the signal received from the first digital processor 200-1 to the deserializer 235 and then sends the signal to the elastic store 236. The overhead generator 237 is composed of various control signals and error detection signals required for digital signal transmission. In addition to the signal to be transmitted, the digital transmission must send the overhead data as described above, so the actual transmission speed is faster than the speed of the signal received by the first digital processing unit 200-1. The elastic buffer 236 serves to match the speed difference between the input signal and the output signal. In this way, the overhead signal and the multiplexed signal are serialized through the 16: 1 multiplexer 221 and transmitted back to the optical path 238 by the optical module. Here, the optical path is taken as an example, but there are various types of transmission lines.

13 is a block diagram of a second digital processing unit of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As illustrated in FIG. 13, the second digital processor 200-2 processes the I / Q signal using the digital transmitter 220. In this case, the function of the digital transmitter is as described above with reference to FIG. 8.

14 is a block diagram of a transmission receiver of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 14, the transmission receiver 233 generates a 16-bit signal through the 16: 1 demultiplexer 239 from the signal received from the optical path 238 and performs a reverse operation of the transmission transmitter 231. The elastic signal 236 separates the transmission signal from the overhead signal, and the transmission signal is sent back to the second digital processing unit 200-2.

In the case of the relay device configured as the master and the slave as described above, it is necessary to consider the time synchronization acquisition problem in addition to the digital transmission. In FIG. 5, since all blocks synchronize time synchronization from the same clock source, there is no problem. However, when two blocks are separated from a master and a slave, as shown in FIG.

15 is a block diagram illustrating a time synchronization processing method of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. As shown in FIG. 15, the reference signal generated by the reference clock generator of the master serves as a reference for the oscillator 209 and the digital system clock for frequency downconversion. The digital system clock is transmitted to the transmission transmitter 231, and the transmission transmitter performs digital transmission based on the clock. In addition, the transmission receiver 233 extracts a repeated frame pulse from the received signal and restores a clock having the same frequency and phase as the reference clock of the master by using the frame pulse. Therefore, the master and the slave as a whole acquire the same time synchronization.

16 is a diagram illustrating input and output characteristics of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. In FIG. 16, the input / output characteristic of the signal processing apparatus according to the present invention has a unique waveform for each channel since the unnecessary signal is completely removed by the DSP, so that the separation is greatly improved, and thus the characteristic is superior to the input RF source signal.

FIG. 17 is a diagram illustrating a signal close to thermal noise as an input / output characteristic of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. In FIG. 17, when the input signal is a signal close to thermal noise, the noise level is remarkably lowered in the input / output characteristics of the signal processing apparatus according to the present invention, so that each channel has a unique waveform, thereby greatly improving the characteristics.

FIG. 18 is a diagram illustrating different communication schemes as input / output characteristics of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. In FIG. 18, when input signals of different communication methods are simultaneously inputted (FIG. 18 shows two three-channel systems having different bandwidths), an inherent waveform for each channel is independent of the communication system even in the input / output characteristics of the signal processing apparatus according to the present invention. The separation degree is greatly improved.

19 is a diagram illustrating a case in which another operator is included in the middle of a band as an input / output characteristic of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. In FIG. 19, even when other carriers are included in the middle of the band, the input / output characteristic of the signal processing apparatus according to the present invention removes all signals of the B operator together with noise, so that only the signal of the A operator is output to the DSP output terminal.

20 is a diagram illustrating a case in which a signal size is different for each channel as an input / output characteristic of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. In Figure 20, even if the signal size is different for each channel, the input and output characteristics of the signal processing apparatus according to the present invention can be adjusted for each channel by the gain control function provided in the DSP stage, so the signal level of the output stage is the same for each channel output do. In addition, the gain control function may include an AGC circuit for each channel.

21 and 22 are examples of actual values of input / output characteristics of a signal processing apparatus of a wireless communication system using a DSP according to the present invention. For convenience of experiment, an input signal uses a signal generated by a signal generator. It was. 21 and 22, the output signal waveform is superior to the input signal waveform, and the separation between channels is also improved. Thus, it is obvious that the improvement effect is much greater in the actual environment than in the laboratory environment using the signal generator as described above.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention, after converting the RF signal of the transmitting and receiving end of the wireless communication system to digital, and extracts the original signal for each channel by the DSP, but not only to improve the communication quality, but also to various transmission media There is an effect that can transmit a good signal even in the long distance transmission.

Claims (27)

In the signal processing method of a wireless communication system for receiving an RF signal converted to an analog intermediate frequency signal and processing and converting the analog intermediate frequency signal back to an RF signal, A first step of converting the received RF signal into an analog intermediate frequency; Converting the analog intermediate frequency signal into a digital signal; A third step of down-converting the digital signal into a baseband digital signal, passing an FIR filter to accurately filter only a frequency of a corresponding channel, and processing the DSP; A fourth step of converting the DSP processed digital signal into an analog intermediate frequency signal; And And a fifth step of converting the analog intermediate frequency signal into an RF signal. The method of claim 1, wherein the first step, Low noise amplifying the received RF signal, Bandpass filtering to remove signals other than the required bands; And a step of down-converting the analog intermediate frequency signal by a mixer. The method of claim 1, wherein the second step, SAW filtering to remove noise components included in the analog intermediate frequency signal; Amplifying or attenuating the analog intermediate frequency signal to obtain a required gain; And converting the analog intermediate frequency signal into a digital signal by an A / D converter. The method of claim 1, wherein the third step, Down converting the digital signal into a baseband digital signal by an NCO and a digital mixer; Removing harmonic components of the down-converted baseband digital signal through CIC filtering; Filtering only the frequencies of the corresponding channels by means of an FIR filter; Adjusting a gain by filtering only the frequency of the corresponding channel by an AGC block; And minimizing a sampling rate of the signal received from the AGC block by a resampler. delete delete delete The method of claim 1, wherein the fourth step, Converting the DSP-processed digital signal into an analog intermediate frequency signal by a D / A converter; Amplifying or attenuating the analog intermediate frequency signal to obtain a required gain, the signal processing method of a wireless communication system using a DSP. The method of claim 1, wherein the fifth step, Upconverting the analog intermediate frequency signal to an RF signal by a mixer; Amplifying or attenuating the RF signal to obtain a required gain; And band-pass filtering the RF signal to remove signals other than the required bands. delete delete delete delete delete delete delete delete delete In the signal processing device of a wireless communication system for receiving an RF signal converted to an analog intermediate frequency signal and processing and converting the analog intermediate frequency signal back to an RF signal, First processing means for converting the received RF signal into an analog intermediate frequency; Second processing means for converting the analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And And a fifth processing means for converting the analog intermediate frequency signal into an RF signal. In the signal processing device of a wireless communication system for receiving an analog intermediate frequency signal converted to an RF signal and transmitted, Second processing means for converting the received analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And And a fifth processing means for converting the analog intermediate frequency signal into an RF signal. In the signal processing device of a wireless communication system for receiving a digital signal and converts it into an RF signal, Third processing means for down-converting the received digital signal into a baseband digital signal, passing the FIR filter to accurately filter only the frequency of the corresponding channel, and processing the DSP; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And And a fifth processing means for converting the analog intermediate frequency signal into an RF signal. In the relay device for receiving an RF signal from the base station to convert the analog intermediate frequency signal to process and convert the analog intermediate frequency signal back to the RF signal, First processing means for converting the RF signal received from the base station into an analog intermediate frequency; Second processing means for converting the analog intermediate frequency signal into a digital signal; Third processing means for down-converting the digital signal into a baseband digital signal and passing through a FIR filter to accurately filter only the frequency of the corresponding channel to perform DSP processing; Fourth processing means for converting the DSP processed digital signal into an analog intermediate frequency signal; And And a fifth processing means for converting the analog intermediate frequency signal into an RF signal. The method of claim 19 or 22, wherein the first processing means, A device for low noise amplifying the received RF signal, A device for bandpass filtering to remove signals other than required bands; A signal processing device for a wireless communication system using a DSP, characterized in that it comprises a device for down-conversion to an analog intermediate frequency signal by a mixer. The method of claim 19, 20 or 22, wherein the second processing means, Apparatus for filtering SAW to remove noise components included in the analog intermediate frequency signal; A device for amplifying or attenuating the analog intermediate frequency signal to obtain a required gain, And a device for converting the analog intermediate frequency signal into a digital signal by an A / D converter. The method according to any one of claims 19 to 22, wherein the third processing means, An apparatus for down converting the digital signal into a baseband digital signal by an NCO and a digital mixer, An apparatus for removing harmonic components from the down-converted baseband digital signal through CIC filtering; A device for filtering only the frequency of the corresponding channel by the FIR filter, An apparatus for adjusting a gain by filtering only the frequency of the corresponding channel by an AGC block; And a device for minimizing a sampling rate of the signal received from the AGC block by a resampler. The method according to any one of claims 19 to 22, wherein the fourth processing means, An apparatus for converting the DSP processed digital signal into an analog intermediate frequency signal by a D / A converter; And a device for amplifying or attenuating the analog intermediate frequency signal to obtain a required gain. The method according to any one of claims 19 to 22, wherein the fifth processing means, A device for up-converting the analog intermediate frequency signal to an RF signal by a mixer; An apparatus for amplifying or attenuating the RF signal to obtain a required gain; And a device for bandpass filtering the RF signal to remove signals other than required bands.