JP2006345189A - Device and method for super-wideband radio communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for ultra-wideband radio communication capable of high-speed communication while preventing the communication quality from deteriorating in a multipath environment. <P>SOLUTION: The ultra-wideband radio communication device is equipped with a transmission-side frequency generation section 2 which generates frequency data specifying a frequency varying in sequence, a pulse generation section 3 which generates pulses of the frequency specified by the frequency data, a signal modulation section 4 which modulates an input signal by using the pulses from the pulse generation section, a signal transmission section 5 which converts the modulated signal into a radio wave and transmits it, a signal reception section 6 which receives a direct wave of the transmitted radio wave and multipath radio waves and converts them into an electric signal, a linearly predictive analysis section 7 which applies a linearly predictive analysis to the signal from the signal reception section, a reception-side frequency generation section 8 which generates the same frequency data with the transmission-side frequency generation section, a direct wave component extraction section 9 which extracts a direct wave component having the frequency specified by the frequency data from the reception-side frequency generation section, and a signal demodulation section 10 which demodulates the extracted direct wave component. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultra-wideband radio communication apparatus and an ultra-wideband radio communication method for performing ultra-wideband radio communication (hereinafter referred to as “UWB (Ultra Wide Band) communication”), and in particular, a technique for suppressing multipath during communication. About.

  Conventionally, UWB communication is known as one of wireless communication methods. In this UWB communication, data is transmitted and received by spreading the data over a very wide frequency band of about 2 GHz using a frequency of 3 to 10 GHz, for example. Since data transmission in each frequency band is performed using weak radio waves such as noise, there is a feature that there is no interference with a wireless device using the same frequency band, and power consumption is extremely low.

By the way, in general, it is inevitable that wireless communication is affected by multipath, and UWB communication is no exception. As a technique for suppressing such a multipath, a feature in which multipath components are orthogonal to each other is used, a multipath component is extracted by calculating a correlation, and the multipath component is canceled ( For example, refer nonpatent literature 1). However, the calculation of correlation requires an enormous amount of calculation and lacks real-time properties, and is not suitable for communication.
Tomoko Matsumoto, Hiroyuki Tsuji, Hiromitsu Wakana, Shingo Omori, Ryuji Kawano, "A Study on Super-Orthogonal Convolutional Coding Using Orthogonal Waveforms for UWB Wireless Communication" 2005 IEICE General Conference A-5 14

  In UWB communication as described above, as a method of preventing deterioration in communication quality due to multipath, a method of taking a guard time by widening a signal pulse interval and a method of taking a signal pulse shape in a waveform orthogonal to each pulse, There is.

  The method of taking a guard time by widening the signal pulse interval has a problem that the upper limit of the communication speed is determined by the guard time and the communication speed cannot be improved. In addition, the method of taking the shape of the signal pulse in a waveform that is orthogonal to each pulse complicates the device configuration for pulse transmission and reception due to the complexity of the pulse waveform. There is a problem that the original advantage of UWB communication that realizes the above cannot be utilized.

  The present invention has been made to solve the above-described problems, and provides an ultra-wideband radio communication apparatus and an ultra-wideband radio communication method that enable high-speed communication by preventing deterioration of communication quality in a multipath environment. It is to provide.

  The present invention employs the following configuration in order to solve the above problems. An ultra-wideband wireless communication apparatus according to a first aspect of the present invention is a transmission-side frequency generation unit that generates frequency data that specifies sequentially changing frequencies, and a pulse that has a frequency specified by the frequency data from the transmission-side frequency generation unit. A pulse generation unit that generates a signal, a signal modulation unit that modulates an external input signal using a pulse from the pulse generation unit, and a modulated signal from the signal modulation unit is converted into a radio wave and transmitted. Performs linear prediction analysis on a signal transmission unit, a signal reception unit that receives a direct wave and a multipath wave transmitted from the signal transmission unit and converts them into an electrical signal, and a signal from the signal reception unit A linear prediction analysis unit that separates a direct wave component and a multipath component, and a reception side frequency that generates the same frequency data as the frequency data generated by the transmission side frequency generation unit A direct wave that extracts a direct wave component having a frequency specified by frequency data from the reception-side frequency generation unit from a direct wave component and a multipath component sent from the number generation unit and the linear prediction analysis unit A component extraction unit and a signal demodulation unit that demodulates the direct wave component extracted by the direct wave component extraction unit are provided.

  According to a second aspect of the present invention, in the ultra wideband wireless communication device according to the first aspect, the transmission-side frequency generation unit generates frequency data that specifies frequencies that sequentially change in a finite period, and the pulse generation unit A sine wave pulse having a frequency specified by the frequency data generated by the transmission side frequency generation unit is generated, and the signal modulation unit uses an external input signal as a sine wave pulse from the pulse generation unit. Modulation.

  According to a third aspect of the present invention, in the ultra-wideband wireless communication apparatus according to the first aspect, the transmission-side frequency generation unit generates frequency data that specifies a frequency that sequentially changes in a quasi-cycle close to an infinite cycle, and the pulse The generation unit generates a sine wave pulse having a frequency specified by the frequency data generated by the transmission side frequency generation unit, and the signal modulation unit converts an external input signal into a sine from the pulse generation unit. It modulates using a wave pulse.

According to a fourth aspect of the present invention, in the ultra-wideband wireless communication apparatus according to the third aspect, the transmission-side frequency generation unit sets frequencies f1 and f2 used to generate a frequency that sequentially changes in the quasi-period. A transmission-side f1, f2 setting unit, and a transmission-side quasi-periodic frequency generation unit that generates frequency data for designating frequencies that sequentially change in quasi-periods based on the frequencies f1 and f2 set by the transmission-side f1, f2 setting unit. With
The reception side frequency generation unit includes a reception side f1, f2 setting unit for setting the same frequencies f1 and f2 as the frequencies f1 and f2 set by the transmission side f1, f2 setting unit, and the reception side f1, f2 setting unit. And a reception-side quasi-periodic frequency generation unit that generates the same frequency data as the frequency data generated by the transmission-side quasi-periodic frequency generation unit based on the frequencies f1 and f2 set in (1).

  According to a fifth aspect of the present invention, in the ultra wideband wireless communication device according to the second or third aspect, the transmission-side frequency generation unit and the reception-side frequency generation unit operate in synchronization.

  According to a sixth aspect of the present invention, in the ultra-wideband wireless communication apparatus according to the second or third aspect, the signal modulation unit generates a sine wave pulse from the pulse generation unit in accordance with a value of an input signal from the outside. Modulation is performed to change the phase to 0 degrees or 180 degrees.

  According to a seventh aspect of the present invention, there is provided an ultra-wideband wireless communication method comprising: a transmitting-side frequency generating step for generating frequency data specifying sequentially changing frequencies; and a frequency specified by the frequency data generated in the transmitting-side frequency generating step. A pulse generation step for generating a pulse, a modulation step for modulating an input signal from the outside using the pulse generated in the pulse generation step, and a signal modulated in the modulation step is converted into a radio wave and transmitted. Performing a linear predictive analysis on the signal obtained in the receiving step, the receiving step for receiving the direct wave and the multipath wave of the radio wave transmitted in the transmitting step and converting them into an electrical signal, and the signal obtained in the receiving step A linear prediction analysis step for separating the direct wave component and the multipath component by the transmission side frequency generation step, Frequency data generated in the reception-side frequency generation step from the reception-side frequency generation step that generates the same frequency data as the frequency data to be generated, and the direct wave component and multipath component separated in the linear prediction analysis step A direct wave component extracting step for extracting a direct wave component having a frequency designated by the above-mentioned method and a demodulating step for demodulating the direct wave component extracted in the direct wave component extracting step.

  The invention according to claim 8 is the ultra-wideband wireless communication method according to claim 7, wherein the transmission-side frequency generation step generates frequency data designating a frequency that sequentially changes in a finite period, and the pulse generation step includes: A sine wave pulse having a frequency specified by the frequency data generated in the frequency generation step is generated, and the modulation step uses an external input signal by using the sine wave pulse generated in the pulse generation step. It is characterized by modulating.

  According to a ninth aspect of the present invention, in the ultra-wideband wireless communication method according to the seventh aspect, the transmitting-side frequency generation step generates frequency data designating a frequency that sequentially changes in a quasi-cycle close to an infinite cycle, and the pulse The generation step generates a sinusoidal pulse having a frequency specified by the frequency data generated in the transmission side frequency generation step, and the modulation step generates an input signal from the outside in the pulse generation step. It modulates using a sine wave pulse, It is characterized by the above-mentioned.

According to a tenth aspect of the present invention, in the ultra-wideband wireless communication method according to the ninth aspect, in the transmission side frequency generation step, frequencies f1 and f2 used to generate a frequency that sequentially changes in the quasi-period are set. Transmitting side f1, f2 setting step;
A transmission-side quasi-period frequency generation step for generating frequency data for designating frequencies that sequentially change in a quasi-period based on the frequencies f1 and f2 set in the transmission-side f1, f2 setting step, and the reception-side frequency generation step Are the receiving side f1, f2 setting step for setting the same frequencies f1 and f2 as the frequencies f1 and f2 set in the transmitting side f1, f2 setting step, and the frequency f1 set in the receiving side f1, f2 setting step. And a reception-side quasi-periodic frequency generation step for generating the same frequency data as the frequency data generated in the transmission-side quasi-periodic frequency generation step based on f2 and f2.

  According to an eleventh aspect of the present invention, in the ultra wideband wireless communication method according to the eighth or ninth aspect, the transmission-side frequency generation step and the reception-side frequency generation step operate in synchronization.

  According to a twelfth aspect of the present invention, in the ultra-wideband wireless communication method according to the eighth or ninth aspect, the modulation step is a sinusoidal pulse generated in the pulse generation step in accordance with a value of an input signal from the outside. The modulation is performed to change the phase of the signal to 0 degree or 180 degrees.

  According to the ultra-wideband radio communication apparatus and the ultra-wideband radio communication method of the present invention, the linear prediction method is used to separate the signal component and the multipath component, so that a simple waveform and a simple transmission / reception system are used. In addition, the guard time can be reduced to a minimum, and communication quality can be prevented from degrading in a multipath environment, enabling high-speed communication.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of an ultra-wideband wireless communication apparatus (hereinafter referred to as “UWB communication apparatus”) according to Embodiment 1 of the present invention. This UWB communication apparatus includes a transmission-side periodic frequency generation unit 2, a sine wave pulse generation unit 3, a signal modulation unit 4 and a signal transmission unit 5 that function as a transmitter, a signal reception unit 6 that functions as a receiver, and a linear prediction analysis. Unit 7, reception-side periodic frequency generation unit 8, direct wave component extraction unit 9, and signal demodulation unit 10.

The transmission-side periodic frequency generation unit 2 corresponds to the transmission-side frequency generation unit of the present invention, and generates frequency data that designates a frequency that sequentially changes in a finite period, for example, 5 periods or 10 periods. Specifically, the transmission-side periodic frequency generation unit 2 generates frequency data according to the following equation (1).

Here, nmodN represents the remainder obtained by dividing the pulse number n (n = 1, 2, 3,...) By the period N. Thereby, the frequency which changes sequentially with the period N is obtained. The frequency data generated by the transmission-side periodic frequency generation unit 2 is sent to the sine wave pulse generation unit 3.

  The sine wave pulse generation unit 3 corresponds to the pulse generation unit of the present invention, and has a sine wave pulse having a frequency indicated by the frequency data sent from the transmission-side periodic frequency generation unit 2 (a finite time of one sine wave period). Waveform). The sine wave pulse generated by the sine wave pulse generation unit 3 is sent to the signal modulation unit 4.

  Based on the sine wave pulse sent from the sine wave pulse generation unit 3, the signal modulation unit 4 receives an input signal sent from the outside as time series data composed of bit strings of “1” and “0”. For example, bi-phase modulation is performed. Specifically, the signal modulation unit 4 uses a 0-degree signal (sinwt) that is a positive phase signal as shown in FIG. 2A for “1” of the input signal, and uses “0” of the input signal. 2 is modulated using a 180-degree signal (−sinwt) which is a reverse phase signal as shown in FIG. 2B, and is sent to the signal transmission unit 5 as a transmission signal.

The signal transmission unit 5 is composed of an antenna, for example, and converts the transmission signal transmitted from the signal modulation unit 4 into a radio wave and transmits it. Therefore, as shown in FIG. 3A, the signal transmission unit 5 sequentially receives sinusoidal pulses whose frequencies change sequentially with time, that is, signal components f ₁ , f ₂ , f ₃ ,. Sent.

The signal receiving unit 6 includes, for example, an antenna, and receives direct waves of sine wave pulses transmitted from the signal transmitting unit 5, that is, signal components f ₁ , f ₂ , f ₃ ,. A multipath wave, that is, multipath components r ₁ , r ₂ , r ₃ ,... Are sequentially received with a slight delay from each direct wave. A signal including the signal components f ₁ , f ₂ , f ₃ ,... And the multipath components r ₁ , r ₂ , r ₃ ,. Sent to part 7.

  The linear prediction analysis unit 7 performs linear prediction analysis on the received signal sent from the signal reception unit 6 using a linear prediction (LPC) analysis method, and for each frequency component, a signal component and a multi-value are analyzed. Separate path components. Hereinafter, a linear prediction analysis method performed by the linear prediction analysis unit 7 will be described.

In the linear prediction analysis method, the following linear prediction filter is considered for time series data {x (n): n = 0, 1, 2,.

Here, a _k (k = 1, 2,..., K) is called a prediction coefficient. The concept used in this equation (2) is similar to the regression analysis method performed in multivariate analysis or the like, and predicts time-series data at a certain time from past time-series data. K is the number of terms or the order of the prediction coefficient.

At this time, in order to obtain an unknown prediction coefficient, the difference between the time series data and the predicted value is defined as follows.

In order to obtain an unknown prediction coefficient a _k (k = 1, 2,..., K), the following norm I _x is minimized so that the calculation result according to Equation (3) is minimized. Decide on a decision.

Here, by the variational operation of norm I _x by the complex conjugate of a _k (k = 1, 2,..., K) shown below,

A simultaneous linear equation with respect to the unknown prediction coefficient a _k (k = 1, 2,..., K) is derived. An unknown prediction coefficient a _k (k = 1, 2,..., K) can be determined by solving the simultaneous linear equations.

Polynomial with prediction coefficients a _k (k = 1, 2,..., K) as coefficients

An expression obtained by factoring

Is represented by F _k as a complex frequency, and F _k is divided into a real part and an imaginary part,

It shall be expressed as

Of the complex frequencies obtained in this way, the real part f _k having the same frequency as that of the direct wave (the order of change in frequency used for the direct wave is synchronized between the transmitting side and the receiving side) is the direct wave component. And others are multipath components. As described above, the direct wave component and the multipath component can be separated. The analysis result in the linear prediction analysis unit 7 is sent to the direct wave component extraction unit 9.

  The configuration and operation of the reception-side periodic frequency generation unit 8 are the same as those of the transmission-side periodic frequency generation unit 2 described above, generate frequency data specifying frequencies that change sequentially in a finite period, and extract direct wave components. Send to part 9.

  The reception-side periodic frequency generation unit 8 is controlled to operate in synchronization with the transmission-side periodic frequency generation unit 2. As this synchronization method, a known method can be used. For example, before starting communication, a conventional UWB communication method (detailed description is omitted) is used to negotiate and synchronize between the reception-side periodic frequency generation unit 8 and the transmission-side periodic frequency generation unit 2. Can be used.

  The direct wave component extraction unit 9 extracts a direct wave component based on the analysis result sent from the linear prediction analysis unit 7 and the frequency data sent from the reception-side periodic frequency generation unit 8.

That is, as shown on the complex frequency plane of FIG. 4, the real part of the complex frequencies p _{1 to} p ₄ sent from the linear prediction analysis unit 7 as the analysis result is sent from the reception-side periodic frequency generation unit 8. One corresponding to the frequency specified by the frequency data thus obtained, that is, _one of p ₁ , p ₃ and p ₄ is extracted as a direct wave component. In this case, anything other than the extracted one is regarded as a multipath component. The direct wave component extracted by the direct wave component extraction unit 9 is sent to the signal demodulation unit 10.

  The signal demodulating unit 10 performs demodulation by outputting “1” when the direct wave component sent from the direct wave component extracting unit 9 is a 0 degree signal and outputting “0” when the direct wave component is a 180 degree signal. . The signal demodulated by the signal demodulator 10 is sent to the outside as an output signal.

  Next, the operation of the UWB communication apparatus according to Embodiment 1 of the present invention configured as described above will be described with reference to the flowchart shown in FIG.

  When communication is started, first, the transmission side and the reception side are synchronized (steps S11 and S21). Specifically, for example, negotiation is performed between the reception-side periodic frequency generation unit 8 and the transmission-side periodic frequency generation unit 2 using a conventional UWB communication method, and these are controlled to operate in synchronization with each other. The

  When the synchronization is completed, frequency data is then generated on the transmission side (step S12). That is, the transmission-side periodic frequency generation unit 2 generates frequency data that designates frequencies that sequentially change with a finite period, and sends the frequency data to the sine wave pulse generation unit 3. Next, a sine wave pulse is generated (step S13). That is, the sine wave pulse generation unit 3 generates a sine wave pulse having a frequency indicated by the frequency data transmitted from the transmission-side periodic frequency generation unit 2 and sends the sine wave pulse to the signal modulation unit 4.

  Next, modulation is performed (step S14). Specifically, the signal modulation unit 4 performs, for example, biphase modulation on the input signal sent from the outside based on the sine wave pulse sent from the sine wave pulse generation unit 3, and the result of the modulation is obtained. The signal is sent to the signal transmitter 5 as a transmission signal. Next, transmission is performed (step S15). That is, the signal transmission unit 5 converts the transmission signal transmitted from the signal modulation unit 4 into a radio wave and transmits it.

On the receiving side, when the above-described synchronization is completed, frequency data is generated (step S22). That is, the reception-side periodic frequency generation unit 8 generates frequency data that specifies frequencies that sequentially change in a finite period, that is, frequency data that is the same as the frequency data generated by the transmission-side periodic frequency generation unit 2, and generates direct wave components. The data is sent to the extraction unit 9. After that, a standby state for waiting for reception is entered. When radio waves are transmitted from the transmission side in this standby state, reception is performed (step S23). That is, the signal receiving unit 6 receives the direct wave and the multipath wave of the sine wave pulse transmitted from the signal transmission unit 5, and receives the signal components f ₁ , f ₂ , f ₃ ,... And the multipath component r _1. , R ₂ , r ₃ ,... Are sent to the linear prediction analysis unit 7 as received signals.

  Next, linear prediction analysis is performed (step S24). That is, the linear prediction analysis unit 7 performs linear prediction analysis on the received signal transmitted from the signal reception unit 6 using a linear prediction analysis method. Next, direct wave extraction is performed (step S25). That is, the direct wave component extraction unit 9 extracts a direct wave component based on the analysis result sent from the linear prediction analysis unit 7 and the frequency data sent from the reception-side periodic frequency generation unit 8, Send to demodulator 10.

  Next, demodulation is performed (step S26). That is, the signal demodulator 10 outputs “1” when the direct wave component sent from the direct wave component extractor 9 is a 0 degree signal, and outputs “0” when it is a 180 degree signal. Demodulation is performed, and the result of this demodulation is sent to the outside as an output signal.

  As described above, according to the UWB communication apparatus according to the first embodiment of the present invention, the multipath component is extracted by extracting the direct wave component using the linear prediction analysis method for separating the signal component and the multipath component. Since it is configured to suppress, it is not necessary to take a large guard time. As a result, the guard time can be reduced to the minimum, and high-speed communication in a multipath environment becomes possible.

  In addition, since one cycle of sinusoidal pulse is used to transmit information, it is not necessary to take a signal pulse shape that is orthogonal to each pulse, and the pulse waveform is simple. A configuration for transmission and reception is simplified.

  FIG. 6 is a block diagram illustrating the configuration of the UWB communication apparatus according to the second embodiment of the present invention. This UWB communication apparatus includes a transmission side f1, f2 setting unit 21, a transmission side quasi-periodic frequency generation unit 22, a sine wave pulse generation unit 3, a signal modulation unit 4 and a signal transmission unit 5 that function as a transmitter, and a receiver. It comprises a functioning signal receiver 6, linear prediction analyzer 7, receiver f 1, f 2 setting unit 31, receiver quasi-periodic frequency generator 32, direct wave component extractor 9 and signal demodulator 10.

  In the UWB communication apparatus according to the second embodiment, the transmission-side periodic frequency generation unit 2 of the UWB communication apparatus according to the first embodiment illustrated in FIG. 1 includes the transmission-side f1, f2 setting unit 21 and the transmission-side quasi-periodic frequency generation unit 22. The reception-side periodic frequency generation unit 8 is replaced with a reception-side f1, f2 setting unit 31 and a reception-side quasi-periodic frequency generation unit 32. Therefore, below, the same code | symbol as the code | symbol used in Example 1 is attached | subjected to the component same as the UWB communication apparatus which concerns on Example 1, and description is abbreviate | omitted or simplified.

  The transmission side f1 and f2 setting unit 21 sets frequencies f1 and f2 used to generate a frequency that sequentially changes in a quasi-period (described later). The frequencies f1 and f2 set by the transmission side f1 and f2 setting unit 21 are sent to the transmission side quasi-periodic frequency generation unit 22.

  Based on the frequencies f1 and f2 set by the transmission side f1 and f2 setting unit 21, the transmission-side quasi-periodic frequency generation unit 22 generates frequency data that designates a frequency that sequentially changes in an infinite cycle.

In reality, due to hardware technology restrictions, a quasi-cycle that is a very long cycle such as 10,000 cycles or 100 million cycles is used instead of an infinite cycle. Specifically, the transmission side quasi-periodic frequency generation unit 22 generates frequency data according to the following equation (7).

Here, Q is a rational number, f ₁ and f ₂ are frequency, t is time, w (t) is a time change of frequency, and C is a constant. The frequency data generated by the transmission side quasi-periodic frequency generation unit 22 is sent to the sine wave pulse generation unit 3. Note that the frequency data that specifies the frequency that sequentially changes in the quasi-cycle can be generated using, for example, a pseudo-random number.

  The configuration and operation of the reception side f1 and f2 setting unit 31 are the same as those of the transmission side f1 and f2 setting unit 21 described above, and the frequencies f1 and f2 that are used to generate frequencies that change sequentially in a quasi-cycle. Set. The frequencies f1, f2 set by the reception side f1, f2 setting unit 21 are sent to the reception side quasi-periodic frequency generation unit 32.

  The configuration and operation of the reception-side quasi-periodic frequency generation unit 32 are the same as those of the transmission-side quasi-periodic frequency generation unit 22 described above, and are based on the frequencies f1 and f2 set by the reception-side f1 and f2 setting unit 31. The frequency data specifying the frequency that sequentially changes in the quasi-cycle is generated and sent to the direct wave component extraction unit 9. The reception-side quasi-periodic frequency generation unit 32 is controlled to operate in synchronization with the transmission-side quasi-periodic frequency generation unit 22. As this synchronization method, the known method described above can be used.

  Next, the operation of the UWB communication apparatus according to the second embodiment of the present invention configured as described above will be described with reference to the flowchart shown in FIG. Note that steps that perform the same processing as the processing in the UWB communication apparatus according to the first embodiment shown in the flowchart of FIG. 5 are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted or simplified.

  Prior to the start of communication, first, frequencies f1 and f2 are set on the receiving side and the transmitting side (steps S10 and S20). That is, the frequencies f 1 and f 2 set by the user using the transmission side f 1 and f 2 setting unit 21 are sent to the transmission side quasi-periodic frequency generation unit 22. Similarly, the frequencies f 1 and f 2 set by the user using the reception side f 1 and f 2 setting unit 31 are sent to the reception side quasi-periodic frequency generation unit 32.

  Next, the transmission side and the reception side are synchronized as in the UWB communication apparatus according to the first embodiment described above (steps S11 and S21). Thereafter, frequency data is generated on the receiving side (step S12).

  That is, the transmission-side quasi-periodic frequency generation unit 22 designates the frequency that sequentially changes in the quasi-period according to the above-described equation (7) based on the frequencies f1 and f2 sent from the transmission-side f1 and f2 setting unit 21. Frequency data is generated and sent to the sine wave pulse generator 3. The following processing is the same as that in the first embodiment.

  On the other hand, frequency data is generated on the receiving side (step S22). That is, the reception-side quasi-periodic frequency generation unit 32 designates the frequency that sequentially changes in the quasi-period according to the above-described equation (7) based on the frequencies f1 and f2 sent from the reception-side f1 and f2 setting unit 31. The frequency data, that is, the same frequency data as the frequency data generated by the transmission side quasi-periodic frequency generation unit 22 is generated and sent to the direct wave component extraction unit 9. After that, a standby state for waiting for reception is entered. The following processing is the same as that in the first embodiment.

  As described above, according to the UWB communication apparatus according to the first embodiment of the present invention, the same effect as the UWB communication apparatus according to the first embodiment is obtained.

  The present invention is applicable to USB communication that enables high-speed communication in a multipath environment.

It is a block diagram which shows the structure of the UWB communication apparatus which concerns on Example 1 of this invention. It is a figure for demonstrating the modulation performed in the UWB communication apparatus which concerns on Example 1 of this invention. It is a figure for demonstrating the relationship between the frequency of the signal component and multipath component which are transmitted / received in the UWB communication apparatus which concerns on Example 1 of this invention, and time. It is a figure for demonstrating operation | movement of the direct wave component extraction part of the UWB communication apparatus which concerns on Example 1 of this invention. It is a flowchart which shows operation | movement of the UWB communication apparatus which concerns on Example 1 of this invention. It is a block diagram which shows the structure of the UWB communication apparatus which concerns on Example 2 of this invention. It is a flowchart which shows operation | movement of the UWB communication apparatus which concerns on Example 2 of this invention.

Explanation of symbols

2 Transmission Side Periodic Frequency Generation Unit 3 Sine Wave Pulse Generation Unit 4 Signal Modulation Unit 5 Signal Transmission Unit 6 Signal Reception Unit 7 Linear Prediction Analysis Unit 8 Reception Side Periodic Frequency Generation Unit 9 Direct Wave Component Extraction Unit 10 Signal Demodulation Unit 21 Transmission Side f1, f2 setting unit 22 transmitting side quasi-periodic frequency generating unit 31 receiving side f1, f2 setting unit 32 receiving-side quasiperiodic frequency generating unit

Claims (12)

A transmission-side frequency generation unit that generates frequency data that specifies sequentially changing frequencies;
A pulse generator for generating a pulse having a frequency specified by frequency data from the transmission-side frequency generator;
A signal modulation unit that modulates an external input signal using a pulse from the pulse generation unit;
A signal transmission unit that converts the modulated signal from the signal modulation unit into a radio wave and transmits the radio wave;
A signal receiving unit that receives a direct wave and a multipath wave of the radio wave transmitted from the signal transmitting unit and converts them into an electrical signal;
A linear prediction analysis unit that separates a direct wave component and a multipath component by performing linear prediction analysis on a signal from the signal receiving unit;
A reception-side frequency generation unit that generates the same frequency data as the frequency data generated by the transmission-side frequency generation unit;
A direct wave component extraction unit that extracts a direct wave component having a frequency specified by frequency data from the reception-side frequency generation unit from the direct wave component and multipath component transmitted from the linear prediction analysis unit;
A signal demodulator that demodulates the direct wave component extracted by the direct wave component extractor;
An ultra-wideband wireless communication device comprising: The transmission-side frequency generation unit generates frequency data specifying a frequency that sequentially changes in a finite period,
The pulse generation unit generates a sine wave pulse having a frequency specified by the frequency data generated by the transmission-side frequency generation unit,
The ultra-wideband wireless communication apparatus according to claim 1, wherein the signal modulation unit modulates an external input signal using a sine wave pulse from the pulse generation unit. The transmission-side frequency generation unit generates frequency data that designates a frequency that sequentially changes in a quasi-cycle close to an infinite cycle,
The pulse generation unit generates a sine wave pulse having a frequency specified by the frequency data generated by the transmission-side frequency generation unit,
The ultra-wideband wireless communication apparatus according to claim 1, wherein the signal modulation unit modulates an external input signal using a sine wave pulse from the pulse generation unit. The transmission-side frequency generator is
Transmitting side f1, f2 setting unit for setting the frequencies f1 and f2 used to generate the frequency that sequentially changes in the quasi-cycle;
A transmission-side quasi-periodic frequency generation unit that generates frequency data specifying frequencies that sequentially change in a quasi-period based on the frequencies f1 and f2 set by the transmission-side f1, f2 setting unit,
The reception-side frequency generation unit is
Receiving side f1, f2 setting unit for setting the same frequencies f1 and f2 as the frequencies f1 and f2 set by the transmitting side f1, f2 setting unit,
A reception-side quasi-periodic frequency generation unit that generates the same frequency data as the frequency data generated by the transmission-side quasi-periodic frequency generation unit based on the frequencies f1 and f2 set by the reception-side f1, f2 setting unit;
The ultra-wideband wireless communication apparatus according to claim 3, further comprising:   4. The ultra wideband wireless communication apparatus according to claim 2, wherein the transmission side frequency generation unit and the reception side frequency generation unit operate in synchronization.   The said signal modulation part performs the modulation | alteration which changes the phase of the sine wave pulse from the said pulse generation part to 0 degree | times or 180 degree | times according to the value of the input signal from the outside. Item 4. The ultra-wideband wireless communication device according to Item 3. A transmission-side frequency generation step for generating frequency data for designating sequentially changing frequencies;
A pulse generation step of generating a pulse having a frequency specified by the frequency data generated in the transmission side frequency generation step;
A modulation step of modulating an external input signal using the pulse generated in the pulse generation step;
A transmission step of converting the signal modulated in the modulation step into a radio wave and transmitting it;
A reception step of receiving the direct wave and the multipath wave of the radio wave transmitted in the transmission step and converting them into an electrical signal;
A linear prediction analysis step for separating a direct wave component and a multipath component by performing a linear prediction analysis on the signal obtained in the reception step;
A reception-side frequency generation step for generating the same frequency data as the frequency data generated in the transmission-side frequency generation step;
A direct wave component extraction step for extracting a direct wave component having a frequency specified by the frequency data generated in the reception side frequency generation step from the direct wave component and the multipath component separated in the linear prediction analysis step; ,
And a demodulating step for demodulating the direct wave component extracted in the direct wave component extracting step. The transmission-side frequency generation step generates frequency data specifying a frequency that sequentially changes in a finite period,
The pulse generation step generates a sine wave pulse having a frequency specified by the frequency data generated in the frequency generation step,
8. The ultra-wideband wireless communication method according to claim 7, wherein the modulating step modulates an external input signal using the sine wave pulse generated in the pulse generating step. The transmission-side frequency generation step generates frequency data specifying a frequency that sequentially changes in a quasi-cycle close to an infinite cycle,
The pulse generation step generates a sine wave pulse having a frequency specified by the frequency data generated in the transmission side frequency generation step,
8. The ultra-wideband wireless communication method according to claim 7, wherein the modulating step modulates an external input signal using the sine wave pulse generated in the pulse generating step. The transmission side frequency generation step includes:
A transmission side f1, f2 setting step for setting the frequencies f1 and f2 used to generate a frequency that changes sequentially in the quasi-cycle;
A transmission side quasi-period frequency generation step for generating frequency data for designating frequencies that sequentially change in a quasi-period based on the frequencies f1 and f2 set in the transmission side f1, f2 setting step,
The reception side frequency generation step includes:
Receiving side f1, f2 setting step for setting the same frequencies f1 and f2 as the frequencies f1 and f2 set in the transmitting side f1, f2 setting step;
A reception-side quasi-periodic frequency generation step for generating the same frequency data as the frequency data generated in the transmission-side quasi-periodic frequency generation step based on the frequencies f1 and f2 set in the reception-side f1, f2 setting step;
The ultra-wideband wireless communication method according to claim 9, further comprising:   The ultra-wideband wireless communication method according to claim 8 or 9, wherein the transmission-side frequency generation step and the reception-side frequency generation step operate synchronously. The modulation step performs modulation for changing the phase of the sine wave pulse generated in the pulse generation step to 0 degree or 180 degrees according to the value of an input signal from the outside. The ultra-wideband wireless communication method according to claim 9.

Images