JPH11154933A - Multicarrier communication method and its system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the transmission efficiency drastically by increasing the number of combination patterns of code words that are available in one communication unit consisting of pluralities of time slots. SOLUTION: A primary modulation matrix of a combination pattern formed by setting three or less combination pairs corresponding to the order of time slots T1-T7 among combination pairs of prescribed frequencies f1-f8 and prescribed phases (0, π=p0, p1) is cross-referenced with a bit pattern in a prescribed bit unit of digital data to be inputted. A modulation signal with a prescribed frequency and phase denoted by the three or less combination pairs is generated, based on one primary modulation matrix corresponding to the bit pattern selected per prescribed bit unit of the inputted digital data based on the cross reference. Then the generated modulation signal is subject to spread modulation for each time slots based on information of the frequency hopping spread code series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-carrier communication method and apparatus, and more particularly, to a multi-carrier communication method and apparatus applicable to a spread spectrum communication method and apparatus and capable of significantly improving transmission efficiency. About.

[0002]

2. Description of the Related Art Spread spectrum communication is a communication method in which a signal is spread over a band wider than the frequency bandwidth of data to be transmitted and transmitted, and is resistant to interference, has signal confidentiality, and has high resolution measurement. It has advantages such as the possibility of distance. This spread spectrum communication is used in areas such as satellite communication and terrestrial communication, and in recent years, further improvements in frequency utilization efficiency and coexistence with existing systems have made it possible for mobile communication and private communication. Application to is progressing.

[0003] As representative systems for realizing the spread spectrum communication, a direct sequence (DS) system and a frequency hopping (FH) are known.
There is a method. The DS method spreads an occupied frequency band by directly modulating spread code pulses onto data modulated by a carrier wave. On the other hand, in the FH method, the carrier frequency of the modulated data is switched according to a spreading code pulse, that is, the carrier frequency is spread over a wide band by hopping. In particular, the fast frequency hopping (Fast FH) method is strong against interference by switching frequencies faster than the information rate, is excellent in the multi-path distance problem, frequency diversity effect, etc., and is used for indoor communication which is greatly affected by mobile communication and fading. It is attracting attention.

[0004] Generally, in the FH system, FSK (Frequency Shift Keying) is used for data modulation. That is, the data to be transmitted is converted into a code word every several bits, and the frequency is shifted according to the code (code word chip) constituting the code word. For example, every three bits of input data are converted into any one of eight code words. Specifically, when the input data is “000”, this is the code word “7-6-5-2-4-4”.
-1-3 ". "0" to form a codeword
“7” is simply called a code or a codeword chip, and the arrangement of codes in each codeword is devised so that data on “000” to “111” can be separated on the receiving side.

[0005] Each code is assigned a different frequency. For example, for codes “0” to “7”, f0 to f7
Are associated with each other. When sending "000",
“F” corresponding to the code word “7-6-5-2-4-1-3”
7, f6, f5, f2, f4, f1, f3 ”. Since eight frequencies are used,
In this case, the modulation is performed using an 8-level MFSK (Multilevel).
FSK) modulation. Hereinafter, data modulation (modulation unrelated to frequency hopping) is referred to as primary modulation.

On the other hand, frequency hopping of a carrier is performed in accordance with a spread code sequence for frequency hopping modulation (pulse train of a pseudo-noise code, hereinafter also referred to simply as “code sequence”). If the number of codes included in this code sequence is 31, 31 different frequencies are selected as hopping frequencies in a frequency band allowed to be used for communication. A cycle in which the code sequence makes one cycle is called a code cycle, and a cycle in which the hopping frequency is switched (1/31 of the code cycle in this example) is called a hopping cycle. The switching of the hopping frequency and the frequency switching by the primary modulation are performed in synchronization.

However, in the above-mentioned FH-MFSK communication, since only one frequency corresponds to each time slot, it is considered that the transmission efficiency is poor, and it is limited to use for primary modulation for each time slot. In some cases, a plurality of frequencies are combined to increase the number of codewords to be selected, thereby increasing the number of bits that can be transmitted, thereby improving transmission efficiency.

[0008] For example, a multi-carrier communication method and apparatus described in Japanese Patent Application No. Hei 8-25944 include FIG.
The primary modulation is performed by the primary modulation matrix shown in FIG. This primary modulation matrix indicates the state of which frequency has been selected for each time slot. In the primary modulation matrix shown in FIG.
This shows a state in which three frequencies are selected from eight frequencies for each of seven time slots T1 to T7. Therefore, three frequencies are transmitted in one time slot. When three frequencies are selected in one time slot, the number of codeword patterns is larger than in a case where only one frequency is selected in one time slot. That is, the number of cases in which one frequency is selected for one time slot is eight, and the number of codeword patterns corresponding to seven time slots is eight to the seventh power, that is, 2 to the power of 21. Whereas, the number of cases where three frequencies are selected for one time slot is ₈ C ₃ = 56,
The number of codeword patterns corresponding to the seven time slots is 56 to the 7th power, which is 2 to the 41st power or more. As a result, the number of patterns of each codeword increases drastically, and the number of bits when seven time slots are used as one communication unit can be increased, so that the transmission efficiency is significantly improved.

[0009] The primary modulated modulated data for each time slot is spread-modulated for each time slot by the hopping matrix shown in FIG. 13B and transmitted as a transmission signal spread over a wide band. Is done.

On the other hand, for example, in a digital modulator and a spread spectrum modulator described in Japanese Patent Application No. 7-219264, four frequencies and two phases are paired as shown in the primary modulation matrix of FIG. 8 frequency / phase slots, and 7 time slots T1 to T1
One frequency / phase slot is associated with each time slot of T7 to perform primary modulation. According to this, since the number of selected frequencies substantially corresponds to the number of frequency / phase slots, it is possible to realize the same transmission efficiency as when using many frequencies with a small number of frequencies.

[0011]

However, even if a conventional multi-carrier communication system in which a plurality of frequencies are associated with one time slot is employed, in order to further increase the transmission efficiency, the number of selected frequencies must be increased. It is necessary to increase the number of frequencies to be selected in response to the increase in the number of frequencies to be selected. Eventually, there is a problem that the frequencies to be selected must be increased.

When a conventional spread spectrum modulation apparatus in which one time slot is associated with a frequency / phase slot is employed, the number of frequencies to be selected can be reduced, but the number of frequencies to be selected is Since there is only one code word, the number of code word patterns is still not large, and there is a problem that transmission efficiency cannot be significantly improved.

On the other hand, the transmission rate of the FH system is lower than that of the DS system due to the switching speed of the frequency synthesizer.
There is still a demand for improved transmission efficiency.

In particular, with the spread of multimedia communication in recent years, the communication target is not only characters, but also a large amount of information.
At the present time when information such as graphics and images is increasing, it is urgently necessary to improve the transmission efficiency.

Accordingly, the present invention is to eliminate such a problem and to dramatically increase transmission efficiency by increasing the number of code word combination patterns that can be taken per communication unit including a plurality of time slots. It is an object of the present invention to provide a multi-carrier communication method and an apparatus therefor.

[0016]

According to a first aspect of the present invention, a predetermined number or less of a combination of a plurality of predetermined frequencies and a plurality of predetermined phases with respect to a bit pattern of a predetermined bit unit of input digital data is provided. A first step of previously associating a plurality of combination patterns in which a combination pair of the above is set corresponding to each time slot, and, based on the association by the first step, converting the input digital data into the digital data A second step of converting into a combination pattern corresponding to the bit pattern of the predetermined bit for each predetermined bit unit, based on the combination pattern converted in the second step, for each time slot, the predetermined number or less And a third step of generating a modulation signal having a predetermined phase and a predetermined frequency indicated by the combination pair.

For this reason, in the first invention, since the number of combination patterns increases drastically and the number of corresponding bit patterns also increases drastically, the switching speed of the frequency synthesizer for shortening the time slot time is maintained. As it is, the transmission efficiency of information in one communication unit composed of a plurality of time slots can be significantly improved.

According to a second aspect of the present invention, for a bit pattern of a predetermined bit unit of input digital data, not more than a predetermined number of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are used for each time. A first step of previously associating a plurality of combination patterns set corresponding to the slots; and, based on the association by the first step, the input digital data is converted for each predetermined bit unit of the digital data. A second step of converting the combination pattern into a combination pattern corresponding to the bit pattern of the predetermined bit, and based on the combination pattern converted in the second step,
A third signal generating a modulated signal of a predetermined frequency having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot;
And a fourth step of spreading and modulating the modulated signal generated in the third step for each time slot based on information of a spread code sequence for frequency hopping. .

For this reason, in the second invention, as in the first invention, it is possible to realize frequency hopping communication having an effect of significantly improving transmission efficiency.

In the third invention, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are determined for each bit pattern of a predetermined bit unit of the output digital data. A first step of previously associating a plurality of combination patterns set corresponding to the slots, from the received signal, for each time slot, to detect the predetermined frequency less than or equal to the predetermined number and the phase of the predetermined frequency, A second step of allocating, for each time slot, a combination pair of a predetermined number or less of the detected predetermined frequency and the phase of the predetermined frequency, and a predetermined number or less of a predetermined number of time slots allocated in the second step. A combination pair is defined as the combination pattern, and is converted into the bit pattern corresponding to the combination pattern based on the association in the first step. Characterized by comprising a third step of outputting the bit pattern as said digital data.

Therefore, in the third invention, a receiving method corresponding to the first invention can be realized.

According to a fourth aspect of the present invention, for a bit pattern of a predetermined bit unit of output digital data, a combination of a predetermined number or less of a plurality of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases is used for each time. A first step of pre-associating a plurality of combination patterns set corresponding to the slots, and a second step of despreading the received signal for each time slot based on information of a spread code sequence for frequency hopping.
Step, from the signal despread in the second step, for each time slot, the predetermined frequency less than the predetermined number and the phase of the predetermined frequency is detected, and the detected predetermined frequency and A third step of allocating a predetermined number or less combination pairs with the phase of the predetermined frequency for each time slot, and the combination pattern of a predetermined number or less for each time slot allocated in the third step as the combination pattern, Converting the bit pattern to the bit pattern corresponding to the combination pattern on the basis of the association in the first step, and outputting the bit pattern as the digital data.

Therefore, in the fourth invention, a receiving method in frequency hopping communication corresponding to the second invention can be realized.

In a fifth aspect based on the first to fourth aspects, the number of combination pairs equal to or less than the predetermined number is two or more.

Therefore, in the fifth invention, the number of combination patterns increases and the number of bit patterns corresponding to the combination patterns increases as compared with the case where the number of combination pairs of each time slot is one. Can be improved.

In a sixth aspect based on the first to fifth aspects, each of the predetermined frequencies in the combination pairs of the predetermined number or less is different.

Therefore, in the sixth invention, there is no longer any combination pair of the same predetermined frequency having different predetermined phases in one time slot, and the information of the combination pair can be transmitted and received reliably.

In a seventh aspect based on the first to sixth aspects, the number of combination pairs equal to or less than the predetermined number changes for each time slot.

Therefore, in the seventh invention, the number of combination patterns further increases and the number of bit patterns corresponding to the combination patterns also increases as compared with the case where the number of combination pairs of each time slot is a fixed number. Therefore, the transmission efficiency can be further improved.

According to an eighth aspect of the present invention, for a bit pattern of a predetermined bit unit of input digital data, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot, and the number of combinations is reduced. A first step of previously associating a plurality of combination patterns set including changing for each time slot; and inputting the digital data based on the association by the first step. A second step of converting into a combination pattern corresponding to the bit pattern of the predetermined bit for each predetermined bit unit, based on the combination pattern converted in the second step, for each time slot, the predetermined number or less And a third step of generating a modulation signal of a predetermined frequency indicated by the combination of the above.

Therefore, in the eighth aspect, the number of combination patterns increases and the number of bit patterns corresponding to the combination patterns increases as compared with the case where the number of combination pairs of each time slot is a fixed number. Therefore, the transmission efficiency can be further improved.

According to a ninth aspect of the present invention, for a bit pattern of a predetermined bit unit of input digital data, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot, and the number of combinations is reduced. A first step of previously associating a plurality of combination patterns set including changing for each time slot; and inputting the digital data based on the association by the first step. A second step of converting into a combination pattern corresponding to the bit pattern of the predetermined bit for each predetermined bit unit, based on the combination pattern converted in the second step, for each time slot, the predetermined number or less A third step of generating a modulation signal of a predetermined frequency indicated by the combination of the above, and the modulation signal generated in the third step , Characterized by comprising a fourth step of spreading modulation for each time slot based on the information of the spreading code sequence for frequency hopping.

For this reason, in the ninth aspect, as in the eighth aspect, it is possible to realize frequency hopping communication having an effect of significantly improving transmission efficiency.

According to a tenth aspect of the present invention, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of output digital data, and the number of combinations is reduced. A first step of previously associating a plurality of combination patterns set including changing for each time slot, and detecting, from a received signal, the predetermined frequency equal to or less than the predetermined number for each time slot; A second step of allocating, for each time slot, a combination of a predetermined number or less of the detected predetermined frequency, and a combination of a predetermined number or less for each time slot allocated in the second step as the combination pattern; Converting the bit pattern corresponding to the combination pattern into the bit pattern based on the association in step 1; Characterized by comprising a third step of outputting as the digital data.

Thus, in the tenth aspect, a receiving method corresponding to the eighth aspect can be realized.

According to an eleventh aspect of the present invention, for a bit pattern of a predetermined bit unit of digital data to be output, combinations of a predetermined number or less of a plurality of combinations of predetermined frequencies are made to correspond to time slots, and the number of combinations is A first step of pre-associating a plurality of combination patterns set including changing for each time slot, and despreading the received signal for each time slot based on information of a spread code sequence for frequency hopping A second step, detecting, from each of the signals despread in the second step, a predetermined frequency equal to or less than the predetermined number for each time slot, and combining a predetermined number or less of the detected predetermined frequencies; A third step of allocating for each time slot, and combining not more than a predetermined number of times for each of the time slots allocated in the third step. And a fourth step of converting the bit pattern into the bit pattern corresponding to the combination pattern and outputting the bit pattern as the digital data based on the association in the first step. Features.

Therefore, in the eleventh invention, a receiving method in frequency hopping communication corresponding to the ninth invention can be realized.

According to a twelfth aspect, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are used for a bit pattern of a predetermined bit unit of input digital data for each time. A conversion table in which a plurality of combination patterns set corresponding to the slots are previously associated, and based on the association of the conversion table, the input digital data is converted into a predetermined bit unit for each predetermined bit unit of the digital data. Conversion means for converting into a combination pattern corresponding to a bit pattern; and a modulation signal of a predetermined frequency having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted by the conversion means. And a modulating means for generating

The twelfth invention is a device invention corresponding to the first invention. As in the first invention, the number of combination patterns increases drastically, and the number of corresponding bit patterns also increases drastically. Therefore, the transmission efficiency of information in one communication unit including a plurality of time slots can be significantly improved while maintaining the switching speed of the frequency synthesizer for shortening the time slot time.

According to a thirteenth aspect, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are determined for each bit pattern of a predetermined bit unit of input digital data. A conversion table in which a plurality of combination patterns set corresponding to the slots are previously associated, and based on the association of the conversion table, the input digital data is converted into a predetermined bit unit for each predetermined bit unit of the digital data. Conversion means for converting into a combination pattern corresponding to a bit pattern; and a modulation signal of a predetermined frequency having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted by the conversion means. And a modulation means for generating a modulation signal generated by the modulation means, Characterized by comprising a diffusion modulating means for spread modulating each time slot Zui.

The thirteenth invention is a device invention corresponding to the second invention, and realizes a frequency hopping communication device having an operation capable of significantly improving transmission efficiency as in the second invention. be able to.

According to a fourteenth aspect of the present invention, for a bit pattern of a predetermined bit unit of digital data to be output, a predetermined number or less of a plurality of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are determined for each time. A conversion table that pre-associates a plurality of combination patterns set corresponding to the slots, and from the received signal, for each time slot, the predetermined frequency equal to or less than the predetermined number and the phase of the predetermined frequency are detected. A demodulating means for allocating, for each time slot, a predetermined number of combinations of the predetermined frequency and the phase of the predetermined frequency, and a combination pattern of a predetermined number or less for each time slot allocated by the demodulation means. And converting the bit pattern into the bit pattern corresponding to the combination pattern based on the association in the conversion table. Characterized by comprising a conversion means for output as serial digital data.

The fourteenth invention is a device invention corresponding to the third invention, and can realize a receiving device corresponding to the twelfth invention.

According to a fifteenth aspect, for a bit pattern of a predetermined bit unit of digital data to be outputted, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases are determined for each time. A conversion table for associating a plurality of combination patterns set corresponding to the slots in advance; a despreading unit for despreading the received signal for each time slot based on information of a spread code sequence for frequency hopping; From the signal despread by the spreading means, for each time slot, the predetermined frequency equal to or less than the predetermined number and the phase of the predetermined frequency are detected, and the phase of the detected predetermined frequency and the phase of the predetermined frequency is detected. Demodulating means for allocating a predetermined number or less of combination pairs for each time slot, and a predetermined number or less of combination pairs for each time slot assigned by the demodulation means. And combined pattern, based on the correspondence of the conversion table, converts the bit pattern corresponding to the combination pattern, characterized by comprising a conversion means for outputting the bit pattern as said digital data.

The fifteenth invention is an apparatus invention corresponding to the fourth invention, and can realize a receiving apparatus in frequency hopping communication corresponding to the thirteenth invention.

In a sixteenth aspect based on the twelfth to fifteenth aspects, the number of combination pairs equal to or less than the predetermined number is two or more.

Therefore, in the sixteenth aspect, the number of combination patterns increases and the number of bit patterns corresponding to the combination patterns increases as compared with the case where the number of combination pairs of each time slot is one. Can be improved.

In a seventeenth aspect based on the twelfth to sixteenth aspects, each of the predetermined frequencies in the combination pairs of the predetermined number or less is different.

Therefore, in the seventeenth aspect, there is no longer any combination pair of the same predetermined frequency having different predetermined phases in one time slot, and the information of the combination pair can be transmitted and received reliably.

In an eighteenth aspect based on the twelfth to seventeenth aspects, the number of combination pairs equal to or less than the predetermined number changes for each time slot.

Therefore, in the eighteenth aspect, the number of combination patterns further increases and the number of bit patterns corresponding to the combination patterns also increases as compared with the case where the number of combination pairs in each time slot is a fixed number. Therefore, the transmission efficiency can be further improved.

In a nineteenth aspect based on the twelfth to eighteenth aspects, the conversion table is arranged such that the predetermined number or less of combination pairs are codeword chips, and the plurality of combination patterns correspond to the number of time slots. As a code word consisting of a code word chip array, a first conversion table in which a plurality of code words and the bit patterns are associated with each other, and a combination pair of the code word chip and the predetermined number or less indicated by the code word chip. Having a second conversion table associated therewith, wherein the conversion means performs conversion between the bit pattern and the predetermined number or less of the combination pairs through the code word and a code word chip constituting the code word. It is characterized by performing.

For this reason, in the nineteenth invention, by interposing a code word and a code word chip constituting the code word, a search process of a code word or a bit pattern of one communication unit consisting of a plurality of time slots is performed. Retrieval of a predetermined number or less of combination pairs from codeword chips in time slot units or search processing of codeword chips from a predetermined number or less of combination pairs is performed smoothly in time.

According to a twentieth aspect, in the nineteenth aspect,
The first conversion table converts a codeword corresponding to one predetermined phase and a plurality of predetermined frequencies or a codeword corresponding to one predetermined frequency and a plurality of predetermined phases into a part of the predetermined bits. Corresponding to a bit pattern, the conversion unit refers to the second conversion table, and sets a combination of a predetermined number or less of predetermined frequencies indicated by codewords corresponding to one predetermined phase and a plurality of predetermined frequencies, Converting the plurality of predetermined phases according to the remaining bit patterns of some bit patterns into a combination pair of the predetermined number or less,
Alternatively, referring to the second conversion table, the remaining bit patterns of the partial bit patterns are combined into a combination of a predetermined number or less of predetermined phases indicated by codewords corresponding to one predetermined frequency and a plurality of predetermined phases. And converting the plurality of predetermined frequencies into a combination pair equal to or less than the predetermined number.

Therefore, in the twentieth aspect, the memory capacity of the first conversion table can be reduced favorably, which contributes to a reduction in the size of the device.

According to a twenty-first aspect, in the nineteenth aspect,
The conversion table is a third conversion table in which a codeword corresponding to one predetermined phase and a plurality of predetermined frequencies or a codeword corresponding to one predetermined frequency and a plurality of predetermined phases is associated with the bit pattern. And a switching means for switching between the first conversion table and the third conversion table.

For this reason, in the twenty-first invention, a conventional device for setting a predetermined number of predetermined frequencies for each time slot or a conventional device for setting a predetermined number of predetermined phases to one predetermined frequency for each time slot Can be communicated with, and with a small number of configuration changes, compatibility with conventional devices can be ensured and flexibility can be increased.

According to a twenty-second aspect, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data. A conversion table for associating a plurality of combination patterns set in advance including changing for each time slot; and, based on the association of the conversion table, input digital data into predetermined bit units of the digital data. A conversion means for converting a combination pattern corresponding to the bit pattern of the predetermined bit for each time slot, based on the combination pattern converted by the conversion means, for each time slot; And a modulating means for generating a signal.

The twenty-second invention is an apparatus invention corresponding to the eighth invention, and similarly to the eighth invention, the number of combination patterns of each time slot is smaller than that of the case where the number of combination pairs is constant. Since the number increases and the number of bit patterns corresponding to the combination patterns can also increase, the transmission efficiency can be further improved.

According to a twenty-third aspect, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data, and the number of combinations is A conversion table for associating a plurality of combination patterns set in advance including changing for each time slot; and, based on the association of the conversion table, input digital data into predetermined bit units of the digital data. A conversion means for converting a combination pattern corresponding to the bit pattern of the predetermined bit for each time slot, based on the combination pattern converted by the conversion means, for each time slot; A modulating means for generating a signal; and a spread code for frequency hopping, the modulating signal generated by the modulating means. Characterized by comprising a spread modulation means for spread modulating each time slot based on the information of the sequence.

The twenty-third invention is a device invention corresponding to the ninth invention, and its operation is the same as that of the ninth invention.

According to a twenty-fourth aspect, for a bit pattern of a predetermined bit unit of output digital data, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot, and the number of combinations is reduced. From a conversion table that previously associates a plurality of combination patterns set including changing for each time slot, and a received signal,
For each time slot, demodulation means for detecting the predetermined frequency equal to or less than the predetermined number, and allocating a combination of the detected frequency equal to or less than the predetermined number for each time slot,
A combination of not more than a predetermined number for each time slot assigned by the demodulation means is set as the combination pattern, and based on the correspondence in the conversion table, the combination is converted into the bit pattern corresponding to the combination pattern. Converting means for outputting the digital data.

The twenty-fourth invention is a device invention corresponding to the tenth invention, and its operation is the same as that of the tenth invention.

According to a twenty-fifth aspect, a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of output digital data, and the number of combinations is reduced. A conversion table for associating a plurality of combination patterns set in advance including changing for each time slot, and a reverse table for despreading a received signal for each time slot based on information of a spread code sequence for frequency hopping. Spreading means, and from the signal despread by the despreading means, for each time slot, detecting the predetermined frequency equal to or less than the predetermined number, and combining the detected frequency equal to or less than the predetermined number for each time slot. Demodulation means to be assigned to, and a combination of a predetermined number or less for each time slot assigned by the demodulation means as the combination pattern, Based on the correspondence of the serial conversion table, it converts the bit pattern corresponding to the combination pattern, characterized by comprising a conversion means for outputting the bit pattern as said digital data.

The twenty-fifth invention is a device invention corresponding to the eleventh invention, and its operation is the same as that of the eleventh invention.

[0066]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the principle of a multicarrier phase frequency hopping communication method according to a first embodiment of the present invention. In the multicarrier phase frequency hopping communication method shown in FIG. 1, first, primary modulation is performed based on the primary modulation matrix shown in FIG. This FIG. 1 (a)
The primary modulation matrix shown in FIG.
At T7, three frequencies out of the eight frequencies f1 to f8 are arranged, and each frequency also has phase information. That is, a hybrid system of the MFSK communication system and the MPSK communication system is adopted. The phase of this phase information is 0 or π, the frequency having the phase “0” is indicated by “○”, and the frequency having the phase “π” is indicated by “●”. Therefore, for each of the time slots T1 to T7,
The number of pairs combining frequency and phase is doubled to 16.

Therefore, the number of states that can be taken in each of the time slots T1 to T7 is 3 out of 16 frequency / phase slots in which eight frequencies f1 to f8 are combined with two phases (0, π). This is the number when ₁₆ frequency / phase slots are selected, ₁₆ C ₃ = 560, and the number when 3 frequencies are selected from 8 frequencies f 1 to f ₈ , compared to ₈ C ₃ = 56. So much more. This means that the number of states of the primary modulation matrix by the seven time slots T1 to T7 becomes (560) 7th power, which is much larger than (56) 7th power when three frequencies are selected. Means The increase in the number of states of the primary modulation matrix means that when the input digital data is a bit string, the number of bits that can be transmitted in one communication unit composed of the time slots T1 to T7 increases, and the transmission efficiency increases. Will be significantly improved.

However, in each of the time slots T1 to T7, when three pairs are selected from a pair in which a frequency is combined with a phase, the same frequency cannot be selected. That is,
In each of the time slots T1 to T7, one frequency / phase slot is first selected from the 16 frequency / phase slots, and then 14 frequency / phase slots having the already selected frequency are removed. One frequency / phase slot is selected from the frequency / phase slots, and finally one is selected from the 12 frequency / phase slots excluding the four frequency / phase slot pairs having the two frequencies already selected.
By selecting the One frequency-phase slot, so three frequency-phase slot is selected, the number of cases becomes a _{(16 C 1 × 14 C 1} × 12 C 1) / 6 = 448 kinds, 560 The number is slightly less than on the street.

As shown in the primary modulation matrix shown in FIG. 1A, three frequencies having phase information are selected for each of the time slots T1 to T7, and each of the time slots T1 to T7 is selected.
When a modulated signal of a signal of three frequencies having phase information is generated for each of T7 to T7, spreading processing according to a predetermined code sequence, here, frequency hopping processing is performed. This frequency hopping process is performed based on the hopping matrix shown in FIG. 1B, and the spreading process using this hopping matrix is the same as the conventional spreading process.

That is, this frequency hopping processing
This is performed by further spreading the frequencies f1 to f8 having the phase information selected by the primary modulation matrix to 127 types of carrier frequencies. In the hopping matrix shown in FIG. 1B, the horizontal axis represents time slots T1 to T7, and the vertical axis represents carrier waves of 127 types of frequencies. The frequencies F1 to F127 of the carrier are indicated by capital letters “F” to distinguish them from intermediate frequencies f1 to f8 due to the primary modulation.

For example, in the time slot T1, the primary modulation has phase information of a frequency f2 having a phase of “0”, a frequency f4 having a phase of “π”, and a frequency f5 having a phase of “0”. Three frequencies are selected, and the frequencies of the modulated signals of the three frequencies having the phase information are converted into frequencies F4, F6, and F7, respectively. That is, in the time slot T1, the components of the frequencies f1 to f8 of the primary modulation matrix are converted into the frequencies F3 to F10. Thus, the eight boxes for each time slot in the hopping matrix correspond to the eight frequencies f1-f of one time slot in the primary modulation matrix.
It corresponds to eight components.

Spreading of the frequency by the hopping matrix is based on the fact that the frequency f1 component in a predetermined time slot is
7 or not. For example, in the frequency hopping by the hopping matrix shown in FIG. 1B, the frequency f1 component includes the frequency F3 in the time slot T1, the frequency F100 in the time slot T2, and the frequency F5 in the time slot T3.
5, etc. are converted respectively.

Next, a multicarrier phase frequency hopping communication apparatus employing the multicarrier phase frequency hopping communication method shown in FIG. 1 will be described with reference to FIGS.

The multi-carrier phase frequency hopping communication device shown in FIG. 2 includes a serial / parallel converter 1, a comparator 2, a code word conversion table 3, a control circuit 4, a multi frequency / phase conversion table 5, a multi frequency / phase generator. 6,
It has a hopping pattern generator 7, an FH (frequency hopping) circuit 8, a synchronization circuit 9, a transmission circuit 11, and an antenna 12.

The serial / parallel converter 1 receives the input 2
The serial data of the value is converted into parallel data in K (in this case, K = 6) bits, and the parallel data is supplied to the comparator 2. The comparator 2 includes a codeword conversion table 3
, The parallel data converted by the serial / parallel converter 1 is converted into a code word, and this code word is supplied to the control circuit 4. As shown in FIG. 3, the codeword conversion table 3 is stored in a ROM (not shown), and is assigned to different 2 ^k types (C0 to C2 ^k -1) of bit patterns and one to one for each bit pattern. And the associated codeword. This codeword has L (in this case, L =
It corresponds to the time slot of 7) and has different codeword chips. This codeword chip is ( _NM C _Q × _NM-N C _Q-1
× _NM-2N C _Q-2 × ...) / Q! Consists of a numeric value for the type. Here, N indicates a phase code and corresponds to the number of types of phases, and M indicates a frequency code and corresponds to the number of types of frequencies. Q is the number of pairs of the selected frequency code and phase code.

Accordingly, the primary modulation matrix shown in FIG. 1A shows a case where L = 7, M = 8 and N = 2, and the codeword conversion table 3 when K = 6 is shown in FIG. 4
It becomes as shown in.

That is, the bit pattern is composed of 64 types of patterns “000000” to “111111”, and the code word chip is composed of 448 types of numerical values “0” to “44”.
7 ". Each codeword has seven different codeword chips, one for 64 bit patterns.
Assigned one to one. In this case, the codeword chips are assigned so as not to overlap in time slot units.

The control circuit 4 controls the entire system. Further, the control circuit 4 refers to the multi-frequency / phase table 5 and converts the codeword converted by the comparator 2 into a multi-frequency / phase code as modulation data, and performs control including the multi-frequency / phase code. The signal is supplied to a multi-frequency / phase generator 6. The multi-frequency / phase table 5 is stored in a ROM (not shown) and has 448 types of codeword chips and multi-frequency / phase codes (information) preset for each codeword chip.

In the multi-frequency / phase conversion table 5 shown in FIG. 5, three pairs of eight kinds of frequency codes and two kinds of phase codes are set for each of 448 kinds of code word chips. Multi-frequency / phase code is set. For example, for the codeword chip "0",
A multi-frequency / phase code “f3p0 · f2p0 · f1” combining a frequency f3 having a phase of “0”, a frequency f2 having a phase of “0”, and a frequency f1 having a phase of “0”
p0 "is set. In FIG. 5, "p0"
Means a phase of “0”, and “p1” means a phase of “π”.

The multi-frequency / phase generator 6 has a frequency synthesizer (not shown), and generates a phase and a frequency corresponding to the multi-frequency / phase code according to a control signal including the multi-frequency / phase code from the control circuit 4. I do. The multi-frequency / phase generator 6 is configured as shown in FIG.
The signal is converted into a modulation signal corresponding to the primary modulation matrix shown in FIG.

The hopping pattern generator 7 generates a preset hopping pattern (spreading code) for frequency hopping according to the control signal from the control circuit 4, and supplies this hopping pattern to the FH circuit 8.
The FH circuit 8 has a frequency synthesizer, and according to the hopping pattern, a local oscillation frequency (F1 to F12).
7) is switched and hopping is performed, and the hopping local oscillation frequency signal is supplied to the mixer 10.

The synchronization circuit 9 is connected between the multi-frequency / phase generator 6 and the FH circuit 8, and synchronizes the chips between them.

The mixer 10 mixes the modulated signal supplied from the multi-frequency / phase generator 6 with the hopping local oscillation frequency supplied from the FH circuit 8 to generate a spread spectrum signal. Amplifies the generated spread spectrum signal and transmits it via the antenna 12.

Specifically, when the bit pattern of the parallel data converted by the serial / parallel converter 1 into 6-bit units is “001010”, the comparator 2
Refers to the codeword conversion table 3 and converts this bit pattern into "119-312-152-5-110-78-
150 "codeword. The control circuit 4 refers to the multi-frequency / phase conversion table 5 and sequentially converts this code word into “f5 · p0−f4 · p1−” according to each codeword chip.
f2 • p0 ”→“ f7 • p1 – f6 • p0 – f4 • p1 ”→
“F8 · p0−f5 · p1−f1 · p0” → “f5 · p0−
f3p0-f2p0 "→" f8p0-f7p0-f
6 ・ p1 」→「 f7 ・ p0－f4 ・ p0－f1 ・ p1 」→
It is converted into each multi-frequency / phase code consisting of “f8 · p0−f4 · p1−f2 · p0” and sent to the multi-frequency / phase generator 6. The pattern indicated by the multi-frequency / phase code group is the same pattern as the primary modulation matrix shown in FIG.

The multi-frequency / phase generator 6 generates a modulation signal indicated by the multi-frequency / phase code “f5 · p0−f4 · p1−f2 · p0”, for example, in the time slot T1. That is, the frequency f5 having the phase “0”,
A frequency f4 having a phase “π” and a frequency f2 having a phase “0” are generated and sent to the mixer 10, respectively. The mixer 10 mixes these modulated signals with the carrier frequency F3 transmitted from the FH circuit, and transmits them as a spread spectrum signal via the transmission circuit 11 and the antenna 12.

Next, a multi-carrier phase frequency hopping communication device having a reception function corresponding to FIG. 1 will be described with reference to FIG. The multicarrier phase frequency hopping communication device shown in FIG. 6 includes a parallel / serial converter 31, a bit pattern generator 32, a codeword conversion table 33, a control circuit 34, a multifrequency / phase conversion table 35, a multifrequency / phase detector 36. , Hopping pattern generator 37, FH (frequency hopping) circuit 3
8, a synchronization circuit 39, a reception circuit 41, and an antenna 42.

The spread spectrum signal received by the antenna 42 is amplified by the receiving circuit 41 and supplied to the mixer 40.

The hopping pattern generator 37 generates a preset hopping pattern (spreading code) for frequency hopping according to a control signal from the control circuit 34. The FH circuit 38 has a frequency synthesizer, switches the local oscillation frequency signal in accordance with the hopping pattern, performs hopping, and supplies the hopping local oscillation frequency signal to the mixer 39. The hopping pattern is synchronized with the hopping pattern on the transmission side by the synchronization circuit 39.

The mixer 39 mixes the spread spectrum signal input from the receiving circuit 41 and the hopping local oscillation frequency signal output from the FH circuit 38, and multiplies a composite signal of a plurality of frequencies to which phase information is added. Output to the frequency / phase detector 36.

The multi-frequency / phase detector 36 detects three frequencies from the composite signal of a plurality of frequencies to which the input phase information is added, and detects the phase of each frequency to thereby input the signals. Demodulate the synthesized signal. The detected three frequencies and their phases are sent to the control circuit 34 as a multi-frequency / phase code.

The control circuit 34 has the same multi-frequency / phase conversion table 35 as the multi-frequency / phase conversion table 5.
, The input multi-frequency / phase code is converted into a codeword chip and output to the bit pattern generator 32 in synchronization with the time slot.

The bit pattern generator 32 controls the control circuit 3
4 are input to time slots T1 to T1.
The seven codewords corresponding to T7 are accumulated, a codeword is generated, and the codeword is converted into a 6-bit bit pattern with reference to the same codeword conversion table 33 as the codeword conversion table 3 to generate the codeword. This generated 6-bit bit pattern sequence is
The data is input to the parallel-serial converter 31, and the parallel-serial converter 31 converts the 6-bit bit pattern string into serial data and outputs the serial data.

As described above, in the first embodiment, a predetermined number of frequencies selected from frequencies pre-assigned to one time slot are simultaneously used, and phase information is added to each frequency. Therefore, the addition of the phase information increases the number of code word patterns, and the number of bit patterns corresponding to the code word patterns on a one-to-one basis. The transmission efficiency is greatly improved. Moreover, the frequency and frequency generated by the combination of frequency and phase
Even if the frequency corresponding to the number of phase slots is not used, the number of frequency / phase slots can be used to achieve almost the same transmission efficiency as when using the same number of frequencies. Moreover, the transmission efficiency can be remarkably improved without shortening the time slot.

Next, an application example of the first embodiment will be described. FIG. 7 shows a multi-carrier phase frequency hopping communication apparatus according to a first application example of the first embodiment, which is different from the multi-carrier phase frequency hopping communication apparatus shown in FIG. And

In the code word conversion table 3a, similar to the code word conversion table 3, code words corresponding to one-to-one correspondences with 6-bit bit patterns are shown. In the multi-frequency / phase conversion table 5 shown in FIG. 5, it is set with only 56 codeword chips “0” to “55”.

The switching section 13 switches between the codeword conversion table 3 and the codeword conversion table 3a referred to by the comparator 2.

Therefore, when switching section 13 is connected to codeword conversion table 3, the same operation as in the multi-carrier phase frequency hopping communication apparatus shown in FIG. When connected to 3a, codeword chips "0" to "55", that is, a multi-frequency / phase code composed of three frequencies having no phase information, that is, all three frequencies have a phase of "0" are used. Thus, the communication device is substantially the same as the communication device employing the conventional multicarrier communication method shown in FIG.

Thus, the transmission / reception with the conventional communication device shown in FIG. 13 can be performed only by adding a simple configuration in which the switching unit 13 and the code word conversion table 3a are further provided. Can be used.

Note that the multi-carrier phase frequency hopping communication apparatus shown in FIG. 6 can be used even when only the frequency information transmitted from the conventional communication apparatus shown in FIG. 13 is received.
Clearly applicable.

Next, a second application example of the first embodiment will be described with reference to FIG. 8. The code word conversion table 3 shown in FIG. 2 is a code word of the code word conversion table 3a, that is, , 56 codewords using codeword chips “0” to “55”, and 3
The multi-frequency / phase conversion table 5 is replaced with a code word conversion table 3b in which bit patterns of bits are associated with each other.
And a multi-frequency conversion table 5b corresponding to the multi-frequency code from which the phase information has been removed.

The comparator 2 refers to the code word conversion table 3b and, based on three bits of the input 6-bit bit pattern, for example, only the three least significant bits,
A code word is selected, and the control circuit 4 sends this code word together with the code word.
The remaining upper 3 bits of the 6-bit bit pattern are supplied.

The control circuit 4 selects the multi-frequency code of each codeword chip from the input codewords with reference to the multifrequency conversion table 5b, and also outputs the phase information corresponding to the input upper 3 bits. The multi-phase code shown is combined with the multi-frequency code, and the combined multi-frequency / phase code is supplied to the multi-frequency / phase generator 6.

The above-mentioned code word conversion table 3b,
The multi-frequency conversion table 5b, the comparator 3, and the control circuit 4 are respectively a code word conversion table 33, a multi-frequency / phase conversion table 35, a bit pattern generator 32, and a control unit in the receiving communication apparatus shown in FIG. Applicable to the circuit 34.

Therefore, the code word conversion tables 3 and 33 and the multi-frequency / phase conversion tables 5 and 35 are replaced with the code word conversion table 3b and the multi-frequency conversion table 5b, respectively, so that the memory capacity can be drastically reduced. The conversion speed can be improved.

Next, a second embodiment will be described with reference to FIG.

FIG. 9 is a diagram showing the principle of a multicarrier frequency hopping communication method according to a second embodiment of the present invention. In the second embodiment, the number of frequencies selected for each time slot is not always a fixed number of three, as in the conventional primary modulation matrix shown in FIG. The difference from the conventional multi-carrier frequency hopping communication method is that the number of frequencies selected for each time slot is made variable.

For example, as shown in the primary modulation matrix shown in FIG. 9 (a), three times → 2 times → 3 times → 2 times → 1 times → 2 times → 3 times in time slots T1 to T7, respectively. Selected.

Here, in the conventional multi-carrier frequency hopping communication method shown in FIG. 13, the number of cases where three frequencies are selected for one time slot is ₈ C ₃
= 56, and the number of codeword patterns corresponding to the seven time slots is 56 to the 7th power, that is, 2 to the 41st power or more, that is, theoretically, 41-bit parallel data is converted to one communication unit. Can be transmitted as
In the second embodiment, the number of cases where the number of frequencies selected for each time slot is set to 1 and the number of cases where the number of frequencies is set to 2 are increased. number of cases in which three frequencies from one selected variable for _{the, (8 C 3 + 8 C} 2 + 8 C 1) = a 92 amino, pattern number of code words corresponding to the seven time slots Is 9
Since the number is 2 7, the number of codeword patterns further increases, the number of bits that can be transmitted per communication unit increases drastically, and transmission can be performed without increasing the frequency and shortening the time slot time. Efficiency can be significantly improved.

FIG. 10 is a diagram showing a configuration for realizing the multicarrier frequency hopping communication method shown in FIG.
In FIG. 10, when binary serial data is input to the serial / parallel converter 51, the serial / parallel converter 51 converts the data into parallel data in units of 6 bits. The codeword conversion table 53 is a conversion table similar to the codeword conversion table 3, and stores different codeword patterns in a one-to-one correspondence with 6-bit bit patterns. However, the number of codeword chips can be set up to 92 types.

The comparator 52 refers to the codeword conversion table 53 and selects a codeword corresponding to the 6-bit bit pattern input from the serial / parallel converter 51.
The selected code word is sent to the control circuit 54.

In the multi-frequency conversion table 55,
Different multi-frequency codes in which one to three frequencies are combined are stored in association with each of code word chips from “0” to “91”. A multi-frequency code combining three frequencies is, for example, “f3-f2-f1”, a multi-frequency code combining two frequencies is, for example, “f2-f1”, and a multi-frequency code of one frequency is “F1”.

The control circuit 54 searches the multi-frequency conversion table 55 for a multi-frequency code for each code word chip of the input code word, and supplies the searched multi-frequency code to the multi-frequency generator 56. .

The multi-frequency generator 56 has a frequency synthesizer (not shown), and generates a frequency corresponding to the multi-frequency code in accordance with a control signal including the multi-frequency code from the control circuit 54. For example, when the multi-frequency code includes three frequencies, the three frequencies are generated. When the multi-frequency code includes two frequencies, the two frequencies are generated. Then, the generated one to three frequencies are supplied to the mixer 60.

The hopping pattern generator 57 generates a hopping pattern set in advance for frequency hopping according to the control signal from the control circuit 54, and supplies this hopping pattern to the FH circuit 58. The FH circuit 58 has a frequency synthesizer, and according to this hopping pattern, the local oscillation frequency (F1 to F127)
Is switched and hopping is performed, and the hopping local oscillation frequency signal is supplied to the mixer 60. Here, the synchronous circuit 5
Numeral 9 is connected between the multi-frequency generator 56 and the FH circuit 58 to synchronize the chips between them.

The mixer 60 mixes the modulated signal supplied from the multi-frequency generator 56 with the hopping local oscillation frequency supplied from the FH circuit 58 to generate a spread spectrum signal. The generated spread spectrum signal is amplified and transmitted via the antenna 62.

Note that the same configuration as that of FIG. 6 can be applied to the configuration of the receiving communication device corresponding to the transmitting communication device. In this case, the multi-frequency
The phase detector 36 is a multi-frequency detector that detects only the frequency.
And the codeword conversion table 33 can be realized by having the same configuration as the codeword conversion table 53 shown in FIG.

As in FIG. 7, a part of the configuration of the codeword conversion table 53 is further provided with a codeword conversion table using a codeword composed of codeword chips from which only one frequency is selected. By providing a switching unit corresponding to the switching unit 13, it is possible to communicate with a communication device that uses only one frequency for one time slot. Further, by providing a codeword conversion table using a codeword composed of codeword chips in which only three frequencies are selected, it is possible to communicate with the conventional multicarrier communication apparatus shown in FIG. Becomes

Next, a third embodiment will be described with reference to FIG.

FIG. 11 is a diagram showing the principle of a multicarrier frequency hopping communication method according to a third embodiment of the present invention. This third embodiment is a combination of the first embodiment and the third embodiment. As shown in the primary modulation matrix of FIG. The number of frequencies to be performed is made variable, and phase information is included in the selected frequency.

In this case, the number of cases where one to three frequencies are variably selected for one time slot is as follows:
_{(8 C 3 + 8 C 2} + 8 C 1) = a 92 amino, a combination of phase information ( "0" and "π") and frequency in a case where three frequencies is selected, there are eight patterns, When two frequencies are selected, there are four combinations of the phase information and the frequency, and when one frequency is selected, there are two patterns of the combination of the phase information and the frequency. the number of possible frequency and phase slots per _{are, (8 C 3 · 8+ 8} C 2 · 4+ 8 C 1 ·
2) = 576. Therefore, the number of codeword patterns corresponding to the seven time slots is 576 to the seventh power, so the number of codeword patterns further increases, the number of bits that can be transmitted in one communication unit increases, and the frequency The transmission efficiency can be significantly improved without increasing or shortening the time slot.

FIG. 12 is a diagram showing a configuration for realizing the multicarrier frequency hopping communication method shown in FIG. In FIG. 12, when binary serial data is input to the serial / parallel converter 71, the serial / parallel converter 71 converts the data into parallel data in units of 6 bits. The codeword conversion table 73 is a codeword conversion table 3
Is a conversion table similar to the above, in which different codeword patterns are stored in a one-to-one correspondence with 6-bit bit patterns. However, the number of codeword chips can be set up to 576.

The comparator 52 refers to the code word conversion table 73 and selects a code word corresponding to the 6-bit bit pattern input from the serial / parallel converter 71.
The selected code word is sent to the control circuit 74.

In the multi-frequency / phase conversion table 75, for each of the codeword chips “0” to “575”, one to three frequencies and phase information (“0” and “ π ”) are stored in correspondence with different multi-frequency / phase codes. A multi-frequency / phase code combining three frequencies and phases is:
For example, “f3 · p0−f2 · p1−f1 · p0”,
A multi-frequency / phase code combining two frequencies and phases is, for example, “f2 · p0−f1 · p1”,
The multi-frequency code of one frequency is “f1 · p0”.

The control circuit 74 refers to the multi-frequency / phase conversion table 75 to search for the multi-frequency / phase code for each codeword chip of the input code word, and converts the searched multi-frequency / phase code to the multi-frequency / phase code. Supply to the phase generator 76;

The multi-frequency / phase generator 76 has a frequency synthesizer (not shown), and has a phase corresponding to the multi-frequency / phase code according to a control signal including the multi-frequency / phase code from the control circuit 74. Generate frequency. For example, when the multi-frequency / phase code includes three frequencies including phase information,
When three frequencies having this phase are generated and two frequencies including phase information are included in the multi-frequency / phase code, two frequencies having this phase are generated. Then, the generated one to three frequencies having phases are supplied to the mixer 60.

The hopping pattern generator 77 generates a hopping pattern set in advance for frequency hopping in accordance with a control signal from the control circuit 74, and supplies the hopping pattern to the FH circuit 78. The FH circuit 78 has a frequency synthesizer, and according to this hopping pattern, the local oscillation frequency (F1 to F127)
Hopping, and supplies the hopping local oscillation frequency signal to the mixer 80. Here, the synchronous circuit 7
Numeral 9 is connected between the multi-frequency generator 76 and the FH circuit 78 to synchronize the chips between them.

The mixer 80 mixes the modulated signal supplied from the multi-frequency generator 76 with the hopping local oscillation frequency supplied from the FH circuit 78 to generate a spread spectrum signal. The generated spread spectrum signal is amplified and transmitted via the antenna 82.

The same configuration as that of FIG. 6 can be applied to the configuration of the receiving communication device corresponding to the transmitting communication device. In this case, the frequency / phase conversion table 35 in FIG. 6 has the same configuration as the multi-frequency conversion table 75 shown in FIG.
Can be realized by having the same configuration as the code word conversion table 73 shown in FIG.

As in FIG. 7, a part of the structure of the code word conversion table 73, a code word conversion table using a code word composed of code word chips from which only one frequency having a phase is selected. And the switching unit 13
Is provided, a communication can be performed with a communication device using only one frequency having a phase for one time slot, for example, the communication device shown in FIG. Further, by providing a codeword conversion table using codewords composed of codeword chips in which only three frequencies having phases are selected, the multicarrier communication according to the first embodiment shown in FIG. Communication can be performed with the device.

In the above-described first to third embodiments, the number of frequencies that can be selected in one time slot or the upper limit of the frequencies that can be selected has been described as three, but the present invention is not limited to this. It is possible to appropriately change and set within the range of the number of selectable frequencies.

In the first and third embodiments described above, the number of the phase information is described as two, that is, “0” and “π”. However, the present invention is not limited to this. For example, four values of “0”, “π / 2”, “π”, and “−π / 2” may be set. According to this, the number of codewords can be further increased, and as a result, transmission efficiency can be significantly improved.

Furthermore, in the above-described first to third embodiments, the number of time slots has been described as seven. However, the number of time slots is not limited to seven, and an arbitrary plurality of time slots may be used.

Further, in the above-described first to third embodiments, the number of bits that can be transmitted in one communication unit has been described as 6 bits. However, the number of bits that can be transmitted in each embodiment corresponds to the amount of information that can be transmitted. It is of course possible to increase the number of bits, and it is a major object of the present invention to increase the number of bits.

Furthermore, in the first to third embodiments described above, the spread spectrum communication method and its apparatus have been described. However, the present invention is not limited to this, and can be applied to a communication method using only primary modulation and demodulation and its apparatus. Of course.

When generating or detecting the above-mentioned modulated signal, the composite waveform information of one or more combination pairs to be generated or detected is stored in advance, and the composite waveform information of one or more corresponding combination pairs is stored. Reading, generation or detection of a modulated signal may be performed. According to this, high-speed generation or detection of a modulation signal can be performed.

[0137]

As described in detail above, the first and the second
In the invention of the fifth aspect, the number of combination patterns increases drastically, and the number of bit patterns corresponding to the number also increases drastically. There is an advantage that information transmission efficiency in a single communication unit can be significantly improved.

In particular, in the seventh and eighteenth aspects, since the number of combination pairs of each time slot is variable in each time slot, the number of combination patterns is further increased as compared with the case of a fixed number. Since the number of bit patterns corresponding to the patterns can be increased, there is an advantage that transmission efficiency can be further improved.

Further, in the eighth to eleventh and twenty-second to twenty-fifth inventions, the number of combination pairs with respect to the frequency of each time slot is variable. Since the number of patterns increases and the number of bit patterns corresponding to the combination patterns can also increase, there is an advantage that the transmission efficiency can be further improved.

Further, in the nineteenth aspect, the code word and the code word chip constituting the code word are interposed to search for a code word or a bit pattern of one communication unit consisting of a plurality of time slots, This has the advantage that retrieval of a combination word of a predetermined number or less from codeword chips in slot units or search processing of a codeword chip from a combination pair of a predetermined number or less can be smoothly performed in time.

Further, the twentieth aspect has the advantage that the memory capacity of the first conversion table can be reduced favorably, which can contribute to a reduction in the size of the device.

Further, in the twenty-first invention, a conventional device for setting a predetermined number of predetermined frequencies for each time slot and a conventional device for setting a predetermined number of predetermined phases to one predetermined frequency for each time slot are provided. Can communicate with
There is an advantage that compatibility with a conventional device can be secured and flexibility can be increased by a small number of configuration changes.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of a multicarrier phase frequency hopping communication method according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a multicarrier phase frequency hopping transmitting apparatus according to a first embodiment of the present invention.

FIG. 3 is a diagram showing the contents of a codeword conversion table.

FIG. 4 is a diagram showing specific contents of a codeword conversion table.

FIG. 5 is a diagram showing the contents of a multi-frequency / phase conversion table.

FIG. 6 is a diagram illustrating a configuration of a multicarrier phase frequency hopping receiver according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a configuration of a multicarrier phase frequency hopping transmitting apparatus that is a first applied example according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating a second applied example according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating the principle of a multicarrier frequency hopping communication method according to a second embodiment of the present invention.

FIG. 10 is a diagram illustrating a configuration of a multicarrier frequency hopping transmitting apparatus according to a second embodiment of the present invention.

FIG. 11 is a diagram illustrating the principle of a multicarrier phase frequency hopping communication method according to a third embodiment of the present invention.

FIG. 12 is a diagram illustrating a configuration of a multicarrier phase frequency hopping transmitting apparatus according to a third embodiment of the present invention.

FIG. 13 is a diagram illustrating the principle of a conventional multicarrier frequency hopping communication method.

FIG. 14 is a diagram showing a primary modulation matrix in a conventional frequency hopping communication method combining frequency and phase.

[Explanation of symbols]

1, 51, 71 ... serial-parallel converter 2, 52, 72 ... comparator 3, 3a, 3b, 33, 53, 73 ... codeword conversion table 4, 34, 54, 74 ... control circuit 5, 5b, 35, 55, 75: Multi-frequency / phase conversion table 6, 56, 76: Multi-frequency / phase generator 7, 37, 57, 77: Hopping pattern generator 8, 38, 58, 78: FH circuit 9, 39, 59, 79: Synchronous circuit 10, 40, 60, 80 ... Mixer 11, 61, 81 ... Transmitter circuit 12, 42, 62, 82 ... Antenna 13 ... Switching unit 31 ... Parallel-serial converter 32 ... Bit pattern generator 36 ... Multi Frequency phase detector 41 ... Reception circuit

Claims (25)

[Claims] 1. For a predetermined bit unit bit pattern of input digital data, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases correspond to each time slot. A first step in which a plurality of combination patterns set in advance are associated with each other, and based on the association in the first step, the input digital data is converted into a predetermined bit unit for each predetermined bit unit of the digital data. A second step of converting to a combination pattern corresponding to a bit pattern; and a predetermined phase having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted in the second step. And a third step of generating a frequency modulated signal. 2. A method according to claim 1, wherein a predetermined number or less of a plurality of pairs of a predetermined frequency and a plurality of predetermined phases correspond to each time slot with respect to a bit pattern of a predetermined bit unit of the input digital data. A first step in which a plurality of combination patterns set in advance are associated with each other, and based on the association in the first step, the input digital data is converted into a predetermined bit unit for each predetermined bit unit of the digital data. A second step of converting to a combination pattern corresponding to a bit pattern; and a predetermined phase having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted in the second step. A third step of generating a frequency modulated signal; and expanding the modulated signal generated in the third step for frequency hopping. A fourth step of performing spread modulation for each time slot based on information of a scattered code sequence. 3. A predetermined number or less combination pairs of a plurality of predetermined frequencies and a plurality of predetermined phases corresponding to a bit pattern of a predetermined bit unit of output digital data corresponding to each time slot. A first step of pre-associating a plurality of combination patterns set in advance, and detecting, from the received signal, the predetermined frequency equal to or less than the predetermined number and the phase of the predetermined frequency for each time slot, and A second step of allocating a predetermined number or less combination pairs of the predetermined frequency and the phase of the predetermined frequency for each time slot; and setting the combination number of the predetermined number or less for each time slot allocated in the second step to the The combination pattern is converted to the bit pattern corresponding to the combination pattern based on the association in the first step. The outputs of down as the digital data 3
And a multi-carrier communication method. 4. A predetermined number or less combination pairs of a plurality of predetermined frequencies and a plurality of predetermined phases corresponding to each time slot with respect to a bit pattern of a predetermined bit unit of output digital data. A second step of pre-associating a plurality of combination patterns set in advance, a second step of despreading a received signal for each time slot based on information of a spread code sequence for frequency hopping, From the signal despread in step, for each time slot, the predetermined frequency equal to or less than the predetermined number and the phase of the predetermined frequency are detected, and the detected predetermined frequency and the phase of the predetermined frequency are detected. A third step of allocating a number of combination pairs equal to or less than a predetermined number for each time slot; and a number of combinations equal to or less than a predetermined number for each time slot allocated in the third step A pair is converted to the bit pattern corresponding to the combination pattern based on the association in the first step, and the bit pattern is output as the digital data.
And a multi-carrier communication method. 5. The multicarrier communication method according to claim 1, wherein the number of combination pairs equal to or less than the predetermined number is two or more. 6. The multicarrier communication method according to claim 1, wherein each of the predetermined frequencies in the combination pairs of the predetermined number or less is different. 7. The system according to claim 1, wherein the number of combination pairs equal to or less than the predetermined number changes for each time slot.
7. The multi-carrier communication method according to any one of claims 6 to 6. 8. A predetermined number or less of combinations of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data, and the number of combinations is A first step of associating a plurality of combination patterns set in advance including a change in the first step with inputting the digital data based on the association by the first step in a predetermined bit unit of the digital data. A second step of converting the combination pattern into a combination pattern corresponding to the bit pattern of the predetermined bit for each time slot based on the combination pattern converted in the second step. A third step of generating a modulated signal of a predetermined frequency. 9. A combination of a predetermined number or less of a plurality of predetermined frequency combinations corresponding to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data, wherein the number of combinations is A first step of associating a plurality of combination patterns set in advance including a change in the first step with inputting the digital data based on the association by the first step in a predetermined bit unit of the digital data. A second step of converting the combination pattern into a combination pattern corresponding to the bit pattern of the predetermined bit for each time slot based on the combination pattern converted in the second step. A third step of generating a modulation signal of a predetermined frequency; and A fourth step of performing spread modulation for each time slot based on information of a spread code sequence for ping, and a multicarrier communication method. 10. A bit pattern in a predetermined bit unit of digital data to be output, wherein a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot. A first step of associating a plurality of combination patterns set in advance, including changing to, from a received signal, for each time slot, detecting the predetermined frequency equal to or less than the predetermined number, and A second step of allocating a predetermined number or less of combinations of a predetermined frequency for each time slot; and a combination of a predetermined number or less of each time slot allocated in the second step as the combination pattern, Based on the association, the bit pattern is converted to the bit pattern corresponding to the combination pattern, and the bit pattern is converted to the digit pattern. Third multicarrier communication method of a characterized by comprising the step of outputting as Rudeta. 11. A bit pattern in a predetermined bit unit of digital data to be output, wherein a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to time slots, and the number of combinations is set for each time slot. A first step of pre-associating a plurality of combination patterns including a change, and a second step of despreading a received signal for each time slot based on information of a spread code sequence for frequency hopping. From the signal despread in the second step, for each time slot, detect the predetermined frequency equal to or less than the predetermined number, and combine a predetermined number or less of the detected predetermined frequency for each time slot. A third step of allocating, and the combination pattern having a predetermined number or less of combinations for each time slot allocated in the third step. And converting the bit pattern to the bit pattern corresponding to the combination pattern based on the association in the first step, and outputting the bit pattern as the digital data. Multi-carrier communication method. 12. With respect to a bit pattern of a predetermined bit unit of input digital data, a predetermined number or less of pairs of combinations of a plurality of predetermined frequencies and a plurality of predetermined phases correspond to each time slot. A conversion table in which a plurality of combination patterns set in advance are associated with each other; and, based on the association in the conversion table, the input digital data corresponds to the bit pattern of the predetermined bit for each predetermined bit unit of the digital data. Converting means for converting the combination pattern into a combination pattern to be converted, and generating a modulation signal of a predetermined frequency having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted by the conversion means. And a multi-carrier communication device. 13. A predetermined number or less combination pairs of a plurality of predetermined frequencies and a plurality of predetermined phases corresponding to a bit pattern of a predetermined bit unit of input digital data corresponding to each time slot. A conversion table in which a plurality of combination patterns set in advance are associated with each other; and, based on the association in the conversion table, the input digital data corresponds to the bit pattern of the predetermined bit for each predetermined bit unit of the digital data. Converting means for converting the combination pattern into a combination pattern to be converted, and generating a modulation signal of a predetermined frequency having a predetermined phase indicated by the predetermined number or less of the combination pairs for each time slot based on the combination pattern converted by the conversion means. Means, and modulating the modulated signal generated by the modulating means based on information of a spread code sequence for frequency hopping. A multicarrier communication apparatus comprising: a spread modulation unit that performs spread modulation for each time slot. 14. A predetermined number or less combination pairs of a plurality of predetermined frequencies and a plurality of predetermined phases are associated with each time slot with respect to a bit pattern of a predetermined bit unit of output digital data. A conversion table for associating a plurality of combination patterns set in advance, and a predetermined frequency equal to or less than the predetermined number and a phase of the predetermined frequency for each time slot from a received signal, and Demodulating means for allocating, for each time slot, a combination of a predetermined number or less of a frequency and a phase of the predetermined frequency; and setting the combination pattern of a predetermined number or less for each time slot assigned by the demodulation means to the combination pattern, Converting the bit pattern into the bit pattern corresponding to the combination pattern based on the correspondence in the table, Multi-carrier communication apparatus being characterized in that comprises a converting means for outputting as data. 15. A predetermined number or less combination pairs of a plurality of predetermined frequencies and a plurality of predetermined phases are associated with each time slot with respect to a bit pattern of a predetermined bit unit of output digital data. A conversion table for pre-associating a plurality of combination patterns set in advance, despreading means for despreading a received signal for each time slot based on information of a spread code sequence for frequency hopping, and despreading by the despreading means. From the spread signal, for each time slot, detect the predetermined frequency and the phase of the predetermined frequency that are equal to or less than the predetermined number, and detect the predetermined frequency and the phase of the predetermined frequency that are equal to or less than the predetermined number. Demodulation means for allocating a combination pair for each time slot; and a combination pattern of a predetermined number or less for each time slot allocated by the demodulation means. Conversion means for converting the bit pattern into the bit pattern corresponding to the combination pattern based on the association in the conversion table, and outputting the bit pattern as the digital data. Communication device. 16. The number of combination pairs equal to or less than the predetermined number is 2
The multicarrier communication apparatus according to any one of claims 12 to 15, wherein the number is the above number. 17. The multicarrier communication apparatus according to claim 12, wherein each of the predetermined frequencies in the combination pairs equal to or less than the predetermined number is different. 18. The multicarrier communication apparatus according to claim 12, wherein the number of the combination pairs equal to or less than the predetermined number changes for each time slot. 19. The conversion table according to claim 17, wherein the predetermined number or less combination pairs are codeword chips, and the plurality of combination patterns are codewords composed of a codeword chip array corresponding to the number of time slots. A first conversion table in which words and the bit patterns are associated with each other, and a second conversion table in which the codeword chips and the combination pairs of the predetermined number or less indicated by the codeword chips are associated with each other, 19. The method according to claim 12, wherein the conversion unit performs conversion between the bit pattern and a combination pair having a predetermined number or less through the code word and a code word chip constituting the code word. The multi-carrier communication device according to any one of the above. 20. The first conversion table stores a code word corresponding to one predetermined phase and a plurality of predetermined frequencies or a code word corresponding to one predetermined frequency and a plurality of predetermined phases, The conversion means is made to correspond to some of the bit patterns, and the conversion means refers to the second conversion table,
The predetermined number obtained by combining the plurality of predetermined phases in accordance with the remaining bit patterns of the partial bit pattern to a combination of a predetermined number or less of predetermined frequencies indicated by codewords corresponding to one predetermined phase and a plurality of predetermined frequencies Convert to the following combination pair, or refer to the second conversion table,
The predetermined number obtained by combining the plurality of predetermined frequencies in accordance with the remaining bit pattern of the partial bit pattern to a combination of a predetermined number or less of a predetermined number indicated by a code word corresponding to one predetermined frequency and a plurality of predetermined phases 20. The multicarrier communication apparatus according to claim 19, wherein conversion is performed to the following combination pairs. 21. The conversion table, wherein a code word corresponding to one predetermined phase and a plurality of predetermined frequencies or a code word corresponding to one predetermined frequency and a plurality of predetermined phases is associated with the bit pattern. 20. The multicarrier communication apparatus according to claim 19, further comprising a third conversion table, further comprising a switching unit configured to switch between the first conversion table and the third conversion table. 22. A predetermined number or less combination of a plurality of predetermined frequencies is made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data, and the number of combinations is And a conversion table for associating a plurality of combination patterns set in advance including a change in the input data with the conversion table. Converting means for converting the bit pattern into a combination pattern corresponding to a bit pattern; and generating a modulation signal of a predetermined frequency indicated by the predetermined number or less of combinations for each time slot based on the combination pattern converted by the conversion means. A multicarrier communication device comprising: a modulation unit. 23. A predetermined number or less combinations of a plurality of predetermined frequencies are made to correspond to each time slot with respect to a bit pattern of a predetermined bit unit of input digital data. And a conversion table for associating a plurality of combination patterns set in advance including a change in the input data with the conversion table. Converting means for converting the bit pattern into a combination pattern corresponding to a bit pattern; and generating a modulation signal of a predetermined frequency indicated by the predetermined number or less of combinations for each time slot based on the combination pattern converted by the conversion means. A modulating means, and modulating the modulated signal generated by the modulating means with information of a spread code sequence for frequency hopping. And a spread modulation unit for performing spread modulation for each time slot based on the multi-carrier communication apparatus. 24. A predetermined number or less combinations of a plurality of predetermined frequencies are associated with each time slot with respect to a bit pattern of a predetermined bit unit of output digital data, and the number of combinations is And a conversion table for associating a plurality of combination patterns set in advance including a change in the predetermined frequency with a predetermined number or less from the received signal, for each time slot, and detecting the predetermined frequency. Demodulation means for allocating combinations of not more than a predetermined number of timeslots for each time slot, and combinations of not more than a predetermined number of timeslots assigned for each time slot assigned by the demodulation means as the combination pattern, based on the correspondence of the conversion table, Convert to the bit pattern corresponding to the combination pattern and output the bit pattern as the digital data Multicarrier communication apparatus characterized by being equipped with a conversion unit that. 25. A bit pattern of a predetermined bit unit of digital data to be output, wherein a predetermined number or less of combinations of a plurality of predetermined frequencies are made to correspond to each time slot, and the number of combinations is A conversion table for associating a plurality of combination patterns set in advance including a change to the above, and a despreading means for despreading the received signal for each time slot based on information of a spread code sequence for frequency hopping, Demodulation means for detecting, from each of the signals despread by the despreading means, for each time slot, the predetermined frequency equal to or less than the predetermined number, and allocating a combination of the detected predetermined frequency or less for each time slot. And a combination of not more than a predetermined number for each time slot assigned by the demodulation means is defined as the combination pattern, Conversion means for converting the bit pattern into the bit pattern corresponding to the combination pattern and outputting the bit pattern as the digital data based on the correspondence of the tables.