KR20040078728A - Ultra wide band communication system using frequency hopping-time hopping gaussian wave packet and method thereof - Google Patents

Abstract

PURPOSE: A UWB(Ultra Wide Band) communication system using a frequency hopping-time hopping Gaussian wave packet is provided to allocate different outputs to each of the sub-bands into which the entire usable frequency band is divided. CONSTITUTION: A frequency-time code generator(703) generates a frequency code for selecting a sub-band for transmitting data when the data is inputted, and a time code for selecting the time when the data is transmitted. A frequency synthesizer(706) generates a frequency corresponding to the frequency code during a predetermined time. When the inputted data is modulated in a preset modulation method, a pulse generator(705) generates a baseband pulse corresponding to the modulated result. A timer(702) controls so that the frequency synthesizer(706) can generate the frequency corresponding to the frequency code during only the time slot corresponding to the time code, and controls so that the pulse generator(705) can generate the baseband pulse corresponding to the modulated result during that time slot only. A mixer(707) mixes the baseband pulse with the frequency, and then outputs it, that is, a frequency hopping-time hopping wave packet.

Description

ULTRA-WIDE BAND COMMUNICATION SYSTEM USING FREQUENCY HOPPING-TIME HOPPING GAUSSIAN WAVE PACKET AND METHOD THEREOF

FIELD OF THE INVENTION The present invention relates to ultra-wideband communication systems, and more particularly to ultra-wideband communication systems and methods using Gaussian wave packets.

In general, communication schemes using the ultra-wide frequency spectrum have long been studied and used as military communication technology. Recently, however, an ultra wide band (UWB) communication system using the ultra wide frequency spectrum has been actively studied as a short range wireless communication system for high speed and low cost communication. The ultra wideband communication system is currently using a frequency band of 3.1 ~ 10.6GHz. Patent Publication WO0195508 filed by Time Domain, Inc., relates to the ultra-wideband communication system, and discloses a receiver that generates a pulse using the entire frequency band and uses a pulse position modulation scheme. The receiver structure of the published patent WO0195508 is shown in FIG. 1, and the receiver of the published patent WO0195508 uses time hopping to reduce the magnitude of the discontinuous component in the frequency spectrum of the continuous pulse signal which periodically generates the frame length. time hopping). However, in general, when the time hopping method is applied to an ultra wideband communication system, the pulse width is about 130 ps. Therefore, in order to successfully demodulate a pulse position modulated pulse at the receiver, a timer having a high time resolution of several ps is required. The implementation of (timer) is essential, and it is difficult to implement a timer having excellent time resolution.

In addition, Patent Application No. WO0193443, filed by XtremeSpectrum in connection with the ultra-wideband communication system, uses a Binary Phase Shift Keying (BPSK) modulation scheme, and uses a time hopping scheme. It discloses a transceiver that uses. The transceiver structure of the published patent WO0193443 is shown in FIG. 2, and the transceiver of the published patent WO0193443 also uses the shortest pulse that can be generated by using the full available frequency band as in the receiver of the published patent WO0195508. Therefore, in order to successfully demodulate the shortest pulse on the receiver side, it is essential to implement a timer having excellent time resolution of several ps, and it is difficult to implement a timer having excellent time resolution.

As described above, the transceiver of published patent WO0195508 and the transceiver of published patent WO0193443 generate short pulses using all available frequency bands, and use the short pulses for actual signal transmission and reception in the frequency domain. The disadvantage is that shaping of the spectrum is difficult or impossible. On the other hand, the spectrum mask that the transmitter of the ultra-wideband communication system must satisfy defines a very low output density outside the licensed frequency band. Therefore, there is a problem in that when a short pulse using the entire frequency band is used, the size of the transmitted signal itself must be reduced in order to satisfy the output density outside the licensed use frequency band.

Therefore, in the ultra-wideband communication system, a method of dividing the entire frequency band into a predetermined set number of subbands without using all available frequency bands and using a pulse using the subbands is proposed. It became. The transceiver structure of an ultra-wideband communication system using the subbands is disclosed in US Pat. No. 6,031,862, and the transmitter structure of US Pat. No. 6,031,862 is shown in FIG. The transmitter of US Pat. No. 6,031,862 divides the entire available frequency band into a preset number of subbands and uses each of the divided subbands as an independent channel. In this case, when the sub-band is used as one channel, the transceiver sets the oscillation frequency of the local oscillator and uses only the frequency of the corresponding band when the channel to be used is determined. However, since only the frequency of the corresponding band is used for only one sub-channel determined in this way, the frequency bands corresponding to the remaining sub-channels are not used at all, resulting in a deterioration in frequency spreading effect, thus reducing the average output spectral level. Has the problem.

Accordingly, an object of the present invention is to provide an ultra wideband communication system using a frequency hopping time hopping Gaussian wave packet and a control method thereof.

The transmitter of the present invention for achieving the above object; A transmitter of an ultra wideband communication system using an ultra wideband frequency band and transmitting the frequency hopping-time hopping wave packet by dividing the ultra wideband frequency band into a plurality of sub-frequency bands, wherein the data is inputted. A frequency code for selecting a subband to transmit the data among the bands, a frequency-time code generator for generating a time code for selecting the time for transmitting the data, and a frequency corresponding to the frequency code for a predetermined time according to a predetermined control; A frequency synthesizer for generating a signal; a pulse generator for generating a baseband pulse corresponding to a result of modulating the input data with a predetermined modulation scheme for a predetermined time according to a predetermined control; and a time corresponding to the time code Only during the slot the frequency synthesizer A timer for controlling to generate a corresponding frequency and controlling the pulse generator to generate a baseband pulse corresponding to the modulation result only during the time slot; and generating a baseband pulse generated by the pulse generator in the frequency synthesizer. And a mixer for mixing the frequencies to output the frequency hopping-time hopping wave packets.

The receiver of the present invention for achieving the above object; A receiver of an ultra wideband communication system using an ultra wideband frequency band and dividing the ultra wideband frequency band into a plurality of sub-frequency bands to transmit a frequency hopping time hopping wave packet. When receiving, generates a frequency code of the sub-band in which the frequency hopping-time hopping wave packet is transmitted among the plurality of sub-frequency bands, and a time code for selecting the time when the frequency hopping-time hopping wave packet is received A frequency-time code generator, a frequency synthesizer for generating a frequency corresponding to the frequency code for a predetermined time according to a predetermined control, and a frequency synthesizer corresponding to the frequency code only for a time slot corresponding to the time code. A timer for controlling to generate a predetermined time; While the received frequency hopping frequency generated - Mixing and time hopping wave packets is characterized in that it comprises a mixer for outputting a baseband pulse.

The transmission method of the present invention for achieving the above object; A transmission method of an ultra-wideband communication system using an ultra-wideband frequency band and transmitting the frequency hopping-time hopping wave packet by dividing the ultra-wideband frequency band into a plurality of sub-frequency bands, wherein the data is inputted. Generating a frequency code for selecting a sub band to transmit the data among the frequency bands, a time code for selecting a time for transmitting the data, and a frequency corresponding to the frequency code only for a time slot corresponding to the time code; Generating a baseband pulse corresponding to a result of modulating the input data by a predetermined modulation scheme only during a time slot corresponding to the time code, and generating the baseband pulse by the baseband pulse. Mix with generated frequency to generate frequency hopping-time hopping wave packets It is characterized in that it comprises a process of transmitting and writing.

Receiving method of the present invention for achieving the above object; A reception method of an ultra-wideband communication system using an ultra-wideband frequency band and transmitting the frequency hopping-time hopping wave packet by dividing the ultra-wideband frequency band into a plurality of sub-frequency bands. Receiving a packet, the frequency code for selecting the sub-band in which the frequency hopping time hopping wave packet is transmitted among the plurality of sub-frequency bands, and the time code for selecting the time when the frequency hopping time hopping wave packet is received Generating a frequency corresponding to the frequency code only during a time slot corresponding to the time code, mixing a frequency generated during the time slot with the received frequency hopping-time hopping wave packet And outputting a band pulse.

1 is a diagram illustrating a receiver structure of an ultra-wideband wireless communication system using a general pulse position modulation scheme.

2 is a diagram illustrating a transceiver structure of an ultra-wideband wireless communication system using a general BPSK scheme and a time hopping scheme.

3 illustrates a transmitter structure of an ultra wideband wireless communication system using general subbands;

4A and 4B are graphs showing a typical Gaussian wave packet.

5 is a graph illustrating phase plane decomposition of an ultra-wideband communication system using a typical Gaussian wave packet.

6 is a graph illustrating a frequency hopping-time hopping Gaussian wave packet according to an embodiment of the present invention.

7 is a graph illustrating the frequency spectrum of a frequency hopping-time hopping Gaussian wave packet according to the present invention.

8 is a graph illustrating the frequency spectrum of a typical time hopping Gaussian wave packet.

9 is a graph illustrating a frequency hopping-time hopping Gaussian wave packet modulated by the OOK scheme according to an embodiment of the present invention.

10 illustrates a transmitter structure of an ultra-wideband wireless communication system for performing a function in an embodiment of the present invention.

11 illustrates a receiver structure of an ultra wideband wireless communication system for performing a function in an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

In general, an ultra wide band (UWB) communication system uses a wide frequency band of 3.1 GHz to 10.6 GHz, and divides the entire frequency band into a preset number of sub-bands. have. The present invention proposes an ultra-wideband communication scheme using a Gaussian wave packet. The Gaussian wave packet exists only for a preset time in frequency bands corresponding to each of the set number of subbands, and has a characteristic of using only a preset frequency band. The modulation of the Gaussian wave packet includes on-off keying with or without a packet in a preset subband for a digital input data of 1 or 0 and in a preset time slot. (OOK: On-Off Keying, hereinafter referred to as "OOK") A modulation scheme, or binary that sets the polarity of a Gaussian wave packet to positive or negative for 1 or 0 digital input data. Phase Shift Keying (BPSK) is performed using a modulation scheme. In addition, the Gaussian wave packet has a characteristic of hopping with respect to two parameters of frequency and time.

Next, the Gaussian wave packet will be described with reference to FIGS. 4A and 4B.

4A and 4B are graphs illustrating a typical Gaussian wave packet.

Before describing FIG. 4A and FIG. 4B, in general, a wave packet is a signal in which both a time when a signal exists and a frequency band used are finite, and there are a plurality of wave packets. A Gaussian wave packet having a Gaussian shape of a signal waveform in a time domain and a spectrum size in a frequency domain region will be used.

4A illustrates a Gaussian wave packet in a time domain, and the Gaussian wave packet is expressed in Equation 1 below.

4B illustrates a Gaussian wave packet in a frequency domain, and the Gaussian wave packet is expressed in Equation 2 below.

In Equations 1 and 2, ω _c is an intermediate frequency (IF) of a frequency band used by the Gaussian wave packet, and t _c is a peak point of the Gaussian wave packet in the time domain. The time represents a delay time delayed from a reference time of t = 0, and ε represents a parameter for determining the width of the time domain and the frequency domain of the Gaussian wave packet. The envelope of the Gaussian wave packet is substantially infinite in the time domain and in the frequency domain, but due to the sharp magnitude attenuation from the center point, the envelope of the Gaussian wave packet exists only in the finite time domain and the finite frequency domain. Then, the interval between two points where the size of the envelope of the Gaussian wave packet is increased by e ^{−π / 4} times from the peak point is defined as half-width. A half width in the time domain of Equation 1 is defined as Δt, and a half width in the frequency domain of Equation 2 is defined as Δω. If Δt and Δω are represented, the following equations (3) and (4) are given.

With Equation 3 and Equation 4, ΔtΔω = 2π can be obtained, and the product of the pulse width in the time domain and the frequency domain is “1”. Accordingly, Equations 1 and 2 represent Gaussian wave packets having a width of Δt in the time domain and Δω in the frequency domain.

On the other hand, the time when one frame (frame) of the ultra-wideband wireless communication system is defined as T _frame , and the frequency band that can be used in the ultra-wideband wireless communication system f _L <f <f _U (ω _L <ω <ω _U ). Then, an area defined by 0 <t <T _frame and ω _L <ω <ω _U on the time-frequency plane, that is, the phase plane, may be expressed as a set of basic areas defined as Δt and Δω. Here, the decomposition of the phase plane will be described with reference to FIG. 5.

5 is a graph illustrating phase plane decomposition of an ultra-wideband communication system using a typical Gaussian wave packet.

5, the phase plane is decomposed into one l _max, the frequency axis _max i _max i _max l total of unit cell (cell) on the time axis. Each of the unit cells has an area of 2π, and defines a unique Gaussian wave packet. That is, since each of the unit cells decomposed on the phase plane exists at different positions in the time domain or the frequency domain, each of the unit cells is defined as a unique Gaussian wave packet. In terms of electrical circuits, Gaussian wave packets with different time domains, that is, different time periods, can be distinguished using time gates. It is possible to distinguish using BPF (Band Pass Filter).

On the other hand, in order to uniformize the power spectrum density (power spectrum density) in the frequency domain of the signal transmitted and received in a general wireless communication is using a frequency hopping (frequency hoppinh) method or time hopping (time hopping) method. In the present invention, both the frequency hopping method and the time hopping method will be used to make the power spectral density uniform in the frequency domain. For example, one user may use one unit cell on the phase plane in one frame section, and another unit cell in the next frame section. According to the present invention, the unit cells (i, l) used by a user during a plurality of frame periods are determined pseudorandomly. The pseudorandom determination of the unit cells (i, l) means that the signals used in the ultra-wideband wireless communication system are hopped and used in the time domain and the frequency domain for each frame, and the unit for one user. The cell (i, l) allocation scheme will be described with reference to FIG.

6 is a graph illustrating a frequency hopping-time hopping Gaussian wave packet according to an embodiment of the present invention.

Referring to FIG. 6, first, a unit cell in which (i, l) = (1, 2) is allocated to any one user in a first frame (frame 1) section, and then a second frame (frame 2) In the interval, a unit cell of (i, l) = (4, 3) is allocated to the user. As a result, frequency hopping and time hopping are performed simultaneously by changing the frequency band and time domain used by the Gaussian wave packet each time the frame is changed.

Next, the frequency spectrum of the frequency hopping-time hopping Gaussian wave packet will be described with reference to FIG. 7.

7 is a graph illustrating a frequency spectrum of a frequency hopping-time hopping Gaussian wave packet according to the present invention.

Referring to FIG. 7, the frequency band of the ultra wideband communication system of 3.1 GHz to 10.6 GHz is divided into a predetermined number, for example, 19 subbands. Here, a frequency band of each of the subbands is defined as Δf, and a time domain of each of the subbands is defined as Δt. The 19 subbands then have respective Δf = 394.7 MHz and Δt = 2.533 ns. In addition, it is assumed that i _max = l _max = 19, assuming that T _frame = 48.13 ns, and a total of 1805000 data is assumed. In addition, it is assumed that a total of 361 Gaussian wave packets use all the unit cells on the phase plane once in a continuous pulse train having a total of 361 frames. In FIG. 7, a spectral comb having a magnitude of about 5 dB appears, because the continuous pulse is a Gaussian wave packet having a constant width of Δt on the time axis, and in order to minimize the spectral comb, It is necessary to vary the transmission or to transmit the position on the time axis so as not to be an integer multiple of the? T. In addition, the selection of the unit cells (i, l) may be changed to minimize the spectral comb. On the other hand, the size of the spectrum comb increases as the number of data in the time domain to be considered when performing a Fast Fourier Transform (FFT).

Next, the frequency spectrum of the time hopping Gaussian wave packet will be described with reference to FIG. 8.

8 is a graph illustrating a frequency spectrum of a general time hopping Gaussian wave packet.

Referring to FIG. 8, in the ultra-wideband communication system of 3.1 GHz to 10.6 GHz, a frequency band is divided into preset numbers, for example, divided into 19 subbands, and the frequency of a Gaussian wave packet when only time hopping is applied. The spectrum is shown. In FIG. 8, the spectrum comb occurs in the 7.5 GHz band, which occurs because the width of the fundamental pulse is 1 / 7.5 ns. As shown in FIG. 8, the spectrum comb generated in the frequency spectrum of the Gaussian wave packet when only time hopping is applied is applied to the frequency spectrum of the Gaussian wave packet when both frequency hopping and time hopping described in FIG. 7 are applied. It can be seen that the magnitude is larger than the generated spectrum comb. In the ultra-wideband wireless communication system, the smaller the size of the spectrum comb, the better the performance. Therefore, when both frequency hopping and time hopping are applied to a Gaussian wave packet, the system performance is improved.

The frequency hopping time-hopping Gaussian wave packet may be modulated in a plurality of manners, that is, a OOK method, a BPSK method, and a quadrature phase shift keying (QPSK) method. Here, a method of modulating the frequency hopping time hopping Gaussian wave packet according to the present invention with each of the above modulation schemes will be described.

First, a case of modulating a frequency hopping time hopping Gaussian wave packet using the OOK method will be described.

The OOK method is 1 if there is a frequency hopping-time hopping Gaussian wave packet to be transmitted to a unit cell (i, l), and 0 if there is no frequency hopping-time hopping Gaussian wave packet to be transmitted to the unit cell (i, l). It is a way of giving. A frequency hopping-time hopping Gaussian wave packet modulated using the OOK scheme is shown in FIG.

Second, a case of modulating a frequency hopping time hopping Gaussian wave packet using the BPSK scheme will be described.

The BPSK method is a method of changing the polarity of the frequency hopping-time hopping Gaussian wave packet to +1 or -1. When the sign of the result value of Equation 1 has a positive value, 1 is represented. If the sign of the result value of Equation 1 has a negative value, 0 is assigned.

Third, a case of modulating a frequency hopping time hopping Gaussian wave packet using the QPSK scheme will be described.

The QPSK scheme Q and the in phase component, i.e., I (in-phase) component and a quadrature component, that is the I component by dividing the Q (Quadrature) component constituting the exp (jω _c t) of the equation (1) Give 1 and 0 to each component. Thus, the frequency hopping-time hopping Gaussian wave packet using the QPSK scheme is expressed by Equation 5 below.

In Equation 5, A = {+1, -1}, B = {+1, -1} or A = {+1, 0}, B = {+1, 0} The frequency hopping of the time-hopping Gaussian wave packet may include two bits (2 bits) of digital information.

Next, a transmitter structure of an ultra wideband wireless communication system for performing a function in an embodiment of the present invention will be described with reference to FIG. 10.

10 is a diagram illustrating a transmitter structure of an ultra-wideband wireless communication system for performing a function in an embodiment of the present invention.

Referring to FIG. 10, first, the transmitter includes a reference signal generator 701, a timer 702, a frequency-time code generator 703, and a modulator ( 704, a pulse generator 705, a frequency synthesizer 706, and a mixer 707. First, the reference time signal generator 701 generates a reference time signal and outputs it to the timer 702 and the frequency-time code generator 703. Here, the reference time signal generator 701 plays the same role as a reference clock generator of a general narrow band wireless communication system, and corresponds to the reference time signal generated by the reference time signal generator 701. All configurations of the transmitter are synchronized. The frequency-time code generator 703 operates in synchronization with the reference time signal output from the reference time signal generator 701, generates a frequency-time code, and outputs the time code to the timer 702. The frequency code is output to the frequency synthesizer 706. Here, the frequency-time code generator 703 pseudorandomly generates the frequency-time code according to which time slot the Gaussian wave packet exists in every frame and which subband to use. In addition, the timer 702 operates in synchronization with the reference time signal output from the reference time signal generator 701, and as specified by the time code output from the frequency-time code generator 703 every frame. After the time delay, a pulse generator driving signal for driving the pulse generator 705 and a frequency synthesizer driving signal for driving the frequency synthesizer 706 are generated and output to the pulse generator 705 and the frequency synthesizer 706. do.

The pulse generator 705 generates a baseband Gaussian pulse and outputs it to the mixer 707 as a pulse generator driving signal output from the timer 702 is input. Here, the magnitude and polarity of the Gaussian pulse are determined corresponding to the modulation scheme of the modulator 074. That is, the modulator 702 generates a pulse size control signal as data is input and outputs it to the pulse generator 705. Here, the modulator 702 modulates input data by selecting one of a OOK method and a BPSK method. For example, when the modulator 702 uses the OOK method, the baseband Gaussian pulse may have a positive polarity or zero by varying the pulse magnitude control signal according to 1 or 0. It should have a size of. Secondly, when the modulator 702 uses the BPSK scheme, the pulse size control signal is changed according to +1 or -1 so that the baseband Gaussian pulse has a positive polarity or a negative polarity. It should have polarity of.

The frequency synthesizer 706 inputs a frequency code output from the frequency-time code generator 703, synthesizes a frequency corresponding to the frequency code to exist only in a time slot designated by the timer 702, and the mixer. Output to 707. That is, the frequency synthesizer driving signal output from the timer 702 serves as a time gate for adjusting the frequency oscillation time of the frequency synthesizer 076. The mixer 707 inputs and mixes a signal output from the pulse generator 705 and a signal output from the frequency synthesizer 706, and transmits the mixed signal through an antenna 708 through air. . Here, the output of the mixer 707 is a subband corresponding to the frequency code output from the frequency-time code generator 703 during the time slot corresponding to the time code output from the frequency-time code generator 703. It becomes a frequency hopping-time hopping Gaussian wave packet in which the center frequency exists.

7 illustrates a transmitter structure for performing a function in an embodiment of the present invention, a receiver structure corresponding to the transmitter structure will be described with reference to FIG.

11 is a diagram illustrating a receiver structure of an ultra-wideband wireless communication system for performing a function in an embodiment of the present invention.

Referring to FIG. 11, first, the receiver includes a low noise amplifier (LNA) 802, a mixer 803, a low pass filter (LPF) 804, and a frequency synthesizer ( 805, integrator 806, timer 807, frequency-time code generator 810, sample and hold circuit 809, reference time signal Generator 810 and a synchronizer 811. Gaussian wave packets received via the antenna 801 are delivered to the low noise amplifier 802. The low noise amplifier 802 low noise amplifies the received Gaussian wave packet at a preset amplification factor and outputs the same to the mixer 803. The mixer 803 mixes the low noise amplified Gaussian wave packet output from the low noise amplifier 802 with the frequency output from the frequency synthesizer 805 and outputs the mixed frequency to the low frequency band communication filter 804. Here, the frequency synthesizer 805 oscillates a frequency corresponding to the frequency code output from the frequency-time code generator 810.

Since the frequency-time code generator 810 has the same frequency-time code information as the transmitter, it generates a frequency-time code suitable for a received Gaussian wave packet, i.e., the same frequency-time code as applied by the transmitter, The code is output to frequency synthesizer 805 and the time code to timer 807. Meanwhile, the reference time signal generator 810 outputs a reference time signal, and all components of the receiver synchronize with the reference time signal. The reference time signal output from the reference time signal generator 810 is output to the timer 807 and the frequency-time code generator 810, and the timer 807 and the frequency-time code generator 810 are the reference. It operates in synchronization with the time signal. The timer 807 corresponds to the frequency code output from the frequency-time code generator 810 at the frequency synthesizer 805 only for a time slot corresponding to the time code output from the frequency-time code generator 810. Control to generate one frequency.

Accordingly, the signal passing through the mixer 803 is low frequency band filtered by the low frequency band pass filter 804 and then output to the integrator 806. Here, the signal output from the mixer 803 is the sum of the baseband Gaussian wave packet and the harmonic signal present in the frequency band twice the frequency generated corresponding to the frequency code. The signal output from the mixer 803 is low frequency filtered by the low frequency band pass filter 804 so that only the baseband Gaussian wave packet remains. The baseband Gaussian wave packet is integrated in the integrator 806 and then passed through a sample-and-hold circuit 809 to output data. At this time, the synchronizer 811 measures the output time of the data which is the total output signal of the receiver, and the reference time signal generator 810 is received by driving the reference time signal generator 810 with the measured time. It is to control synchronization with Gaussian wave packet.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

Referring to the advantages of the present invention as described above are as follows.

First, it has the advantage that spectral shaping is easy.

The present invention divides the entire frequency band available in an ultra-wideband wireless communication system into a plurality of subbands, and uses a frequency hopping-time hopping Gaussian wave packet for each of the subbands to provide different outputs to each of the subbands. Makes it possible to assign. In addition, the spectrum of the entire frequency domain is determined according to the output designated to each of the sub-bands, and the present invention exhibits rapid spectrum reduction in frequency bands other than the frequency bands usable in the ultra-wideband communication system, thereby facilitating spectrum shaping. .

Secondly, there is an advantage that it is not necessary to separately provide a timer of high time resolution.

Since the present invention divides the entire frequency band available in the ultra-wideband wireless communication system into, for example, i _max subbands, the time resolution of the timer required for the transceiver is required for the transceiver when the entire frequency band is used. It is i _max times the time resolution of the timer. As a result, the present invention eliminates the need for a timer with high time resolution since no timer with fine time resolution is required.

Third, there is an advantage that the frequency spectrum comb is reduced.

Since the present invention uses frequency hopping time hopping Gaussian wave packets, comb occurring in the frequency spectrum is reduced compared to the case of applying only time hopping to a relatively short continuous pulse. In general, the periodic pulse array signal has only a comb component (discontinuous component; Fourier series component) in the frequency domain, and the effect of spreading to use the continuous frequency component is obtained from time hopping. However, since time hopping alone does not completely remove comb occurring in the frequency spectrum, the present invention applies not only the time hopping but also frequency hopping to minimize the comb occurring in the frequency spectrum. Also. The comb component is generated by the repetition of a pulse, and if the repetition of the pulse is periodic, only the comb component exists in the frequency spectrum. Transmitting pulses without this full periodicity reduces the size of the comb component on the frequency spectrum. In the present invention, in the case of a repetitive pulse signal using the entire frequency spectrum, the same shape pulse is repeatedly applied irregularly by time hopping, thereby reducing the size of the comb on the frequency spectrum. As a result, when both frequency hopping and time hopping are applied to continuous pulses using subbands, pulse signals of different shapes appear irregularly on the time axis, thereby minimizing the size of comb on the frequency spectrum.

Claims (14)

A transmitter of an ultra wideband communication system using an ultra wideband frequency band, and transmitting the frequency hopping-time hopping wave packet by dividing the ultra wideband frequency band into a plurality of sub-frequency bands. A frequency-time code generator for generating a frequency code for selecting a subband to transmit the data from among a plurality of sub-frequency bands when the data is input, and a time code for selecting a time for transmitting the data; A frequency synthesizer for generating a frequency corresponding to the frequency code for a predetermined time according to a predetermined control; A pulse generator for generating a baseband pulse corresponding to a result of modulating the input data by a predetermined modulation method for a predetermined time according to a predetermined control; Controlling the frequency synthesizer to generate a frequency corresponding to the frequency code only during a time slot corresponding to the time code, and controlling the pulse generator to generate a baseband pulse corresponding to the modulation result only during the time slot. With a timer, And a mixer for mixing the baseband pulses generated by the pulse generator to mix the frequencies generated by the frequency synthesizer and output them as frequency hopping-time hopping wave packets. The method of claim 1, The transmitter further comprises a modulator for modulating the input data according to a preset modulation scheme to generate a drive control signal of the pulse generator. The method of claim 1, The modulation method is characterized in that the binary phase shift keying (BPSK) method or on-off keying (OOK: On-Off Keying) method. The method of claim 1, The frequency hopping time hopping wave packet is a frequency hopping time hopping Gaussian wave packet. A transmission method of an ultra-wideband communication system using an ultra-wideband frequency band, and transmitting the frequency hopping-time hopping wave packet by dividing the ultra-wideband frequency band into a plurality of sub-frequency bands. Generating a frequency code for selecting a subband to transmit the data from among a plurality of sub-frequency bands when the data is input, and generating a time code for selecting a time to transmit the data; Generating a frequency corresponding to the frequency code only for a time slot corresponding to the time code; Generating a baseband pulse corresponding to a result of modulating the input data with a preset modulation scheme only for a time slot corresponding to the time code; And mixing the baseband pulse with the generated frequency to generate and transmit a frequency hopping time hopping wave packet. The method of claim 5, The modulation method is characterized in that the binary phase shift keying (BPSK) method or on-off keying (OOK: On-Off Keying) method. The method of claim 5, And the frequency hopping time hopping wave packet is a frequency hopping time hopping Gaussian wave packet. A receiver of an ultra wideband communication system using an ultra wideband frequency band and transmitting a frequency hopping time hopping wave packet by dividing the ultra wideband frequency band into a plurality of sub-frequency bands. When the frequency hopping time hopping wave packet is received, a frequency code for selecting a subband in which the frequency hopping time hopping wave packet is transmitted among the plurality of sub frequency bands is received, and the frequency hopping time hopping wave packet is received. A frequency-time code generator for generating a time code for selecting a time; A frequency synthesizer for generating a frequency corresponding to the frequency code for a predetermined time according to a predetermined control; A timer for controlling the frequency synthesizer to generate a frequency corresponding to the frequency code only during a time slot corresponding to the time code; And a mixer for mixing the frequency generated during the predetermined time with the received frequency hopping-time hopping wave packet to output a baseband pulse. The method of claim 8, The receiver includes an integrator that time integrates the baseband pulses; And a sample-and-hold circuit for digitally converting the time-integrated signal to output information data. The method of claim 8, The modulation method is characterized in that the binary phase shift keying (BPSK) method or on-off keying (OOK: On-Off Keying) method. The method of claim 8, And the frequency hopping time hopping wave packet is a frequency hopping time hopping Gaussian wave packet. A reception method of an ultra-wideband communication system using an ultra-wideband frequency band, and transmitting the frequency hopping-time hopping wave packet by dividing the ultra-wideband frequency band into a plurality of sub-frequency bands. When the frequency hopping time hopping wave packet is received, a frequency code for selecting a subband in which the frequency hopping time hopping wave packet is transmitted among the plurality of sub frequency bands is received, and the frequency hopping time hopping wave packet is received. Generating a timecode to select a time, Generating a frequency corresponding to the frequency code only for a time slot corresponding to the time code; And mixing the frequency generated during the time slot with the received frequency hopping-time hopping wave packet to output as a baseband pulse. The method of claim 12, Time integration of the baseband pulses; And digitally converting the time-integrated signal to output information data. The method of claim 12, And the frequency hopping time hopping wave packet is a frequency hopping time hopping Gaussian wave packet.