JP3346945B2 - Wireless transmitting device and wireless transmitting / receiving device - Google Patents

Wireless transmitting device and wireless transmitting / receiving device

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Publication number
JP3346945B2
JP3346945B2 JP11944995A JP11944995A JP3346945B2 JP 3346945 B2 JP3346945 B2 JP 3346945B2 JP 11944995 A JP11944995 A JP 11944995A JP 11944995 A JP11944995 A JP 11944995A JP 3346945 B2 JP3346945 B2 JP 3346945B2
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data
carriers
transmission
parallel
bit
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JPH08316851A (en
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正雄 中川
義克 中川
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株式会社リコー
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Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio transmitting apparatus and a radio transmitting apparatus.
On the sending and receiving devices.

[0002]

2. Description of the Related Art At present, radio transmission devices and radio reception devices used in a mobile state, such as mobile telephones and automobile televisions, have become widespread. In order to cope with this, in mobile phones and the like, an error correction code is added to transmission data and interleaving is performed so that an error burst of radio data can be restored in a radio reception device. Efficiency decreases.
In a car television or the like, the reception state of wireless data is improved by adopting a space diversity antenna. However, this requires a plurality of antennas in a wireless reception device.

[0003] A radio transmission apparatus which has solved the above-mentioned problems is disclosed in "YS Leung et al," Multifrequency Trell.
is Coding with Low Delay for Fading Channel
s ", IEEE Trans.Communications, Vol.41, No.1
0, October 1993 ". This wireless transmission device will be described below as a conventional example with reference to FIGS.

[0005] As shown in FIG. 5, the wireless transmission device 1 includes a data input unit 2 to which transmission data is serially input.
To which one serial / parallel converter 3 is connected. This serial / parallel converter 3
The convolutional encoder 4 is connected to the parallel k-bit output terminal of the convolutional encoder 4.
Are connected to a parallel n-bit output terminal at every m bits.
(= N / m) M-value modulators 5 are connected. L frequency converters 6 are individually connected to these L M-value modulators 5, and these L frequency converters 6 are connected to one transmission antenna 8 via one synthesizer 7. It is connected.

In the wireless transmission apparatus 1 having such a structure, serial transmission data input to the data input section 2 is converted into parallel data by a serial / parallel converter 3 every k bits, and the parallel k bit data is converted. The transmitted data is
The convolutional encoder 4 performs convolutional encoding every n bits. The n-bit transmission data convolutionally coded in this way is converted into M data by the L M-value modulators 5 every m bits.
It is value-modulated, and multi-value modulated by L frequency converters 6 into L carriers whose frequencies are separated. Since the L carriers whose frequencies have deviated in this manner are wirelessly transmitted from one transmission antenna 8, there are L carriers whose frequencies have deviated in this radio wave, as shown in FIG.

[0006] In such a radio wave, since the frequency of the carrier is separated, even if the carrier disappears due to fading, there is a low possibility that a plurality of adjacent carriers disappear simultaneously. Each of these carriers is convolutionally coded, so that even if a specific carrier is lost, it is restored by an adjacent carrier. For this reason, the radio wave can be transmitted satisfactorily without performing the interleaving deeply, so that the efficiency of the radio communication can be improved.

[0007]

In the above-described radio transmitting apparatus 1, although there is a low possibility that a plurality of adjacent carriers disappear simultaneously due to fading, a decrease in communication quality is inevitable in low-speed fading close to flat fading.

[0008] Further, since the frequency of the carrier deviates, the band required for wireless communication is extremely widened as compared with the band of the transmission data, so that it is not suitable when the communication band is limited.

[0009]

According to a first aspect of the present invention, there is provided a radio transmitting apparatus comprising: a data encoding unit for encoding serial transmission data into an (n, k) block code; Data conversion means for converting data into parallel data every n bits; data modulation means for modulating parallel transmission data into n carriers having different frequencies for each bit; and n carriers having different frequencies. Data transmission means for individually performing wireless transmission from n positions separated from each other by a distance equal to or more than a quarter of the wavelength.

According to a second aspect of the present invention, there is provided a wireless transmission apparatus, comprising: a data encoding means for encoding serial transmission data into an (n, k) block code; Data conversion means for converting parallel transmission data, data modulation means for modulating parallel transmission data into n carriers having orthogonal waveforms for each bit, and n carriers having orthogonal waveforms for each quarter of each wavelength Data transmission means for individually performing wireless transmission from n positions separated by one or more distances.

[0011] radio transmission receiving device of the invention of claim 3, wherein the
3. A wireless transmission device according to claim 1, wherein said data reception means wirelessly receives n carriers at one position, and data which demodulates each of the received n carriers by one bit in parallel. A wireless receiving apparatus including: a demodulating unit; a data converting unit configured to convert the demodulated parallel n-bit received data to serial data; and a data decoding unit configured to decode the serial received data every n bits.
I do.

According to a fourth aspect of the present invention, there is provided a wireless transmission apparatus, comprising: a data conversion means for converting serial transmission data into k-bit data in parallel; and data for convolutionally encoding k-bit parallel transmission data in n-bit data. Encoding means;
Data modulation means for multi-level modulating the convolutionally coded n-bit transmission data into L carriers whose frequencies are separated by m bits; and L carriers whose frequencies are separated by one-quarter of each wavelength. Data transmission means for individually performing wireless transmission from the L positions separated from each other by the above distance.

According to a fifth aspect of the present invention, there is provided a wireless transmission apparatus, comprising: a data conversion means for converting serial transmission data into k-bit data in parallel; and data for convolutionally encoding k-bit parallel transmission data in n-bit data. Encoding means;
Data modulation means for multi-level modulating the convolutionally encoded n-bit transmission data into L (= n / m) carriers whose waveforms are orthogonal every m bits; Data transmission means for individually performing wireless transmission from L positions separated from each other by a distance equal to or more than a quarter of the wavelength.

[0014] radio transmission receiver of the invention described in claim 6,
6. The wireless transmission device according to claim 4, wherein: a data receiving unit that wirelessly receives the L carriers at one position; and data that demodulates each of the received L carriers in parallel by m bits. A radio receiving apparatus comprising: a demodulation unit; a data decoding unit for decoding demodulated parallel n-bit reception data; and a data conversion unit for converting the decoded parallel k-bit reception data into serial data.
And

[0015]

In the wireless transmission apparatus according to the first aspect of the present invention, serial transmission data is converted into (n,
k) It is encoded into a block code, and the encoded serial transmission data is converted in parallel by the data conversion means for every n bits. This parallel transmission data is modulated by the data modulating means into n carriers whose frequency is deviated for each bit, and n carriers whose frequency is deviated.
Data carriers are individually wirelessly transmitted by the data transmitting means from n positions separated from each other by a distance equal to or more than a quarter of each wavelength. Since the n carriers wirelessly transmitted in this way have different transmission paths, they have different fading characteristics, and a plurality of carriers are complemented by error correction.
Works the same as space diversity.

According to a second aspect of the present invention,
The serial transmission data is encoded into an (n, k) block code by a data encoding unit, and the encoded serial transmission data is converted into a parallel data every n bits by the data conversion unit. The parallel transmission data is modulated by the data modulating means into n carriers whose waveforms are orthogonal for each bit, and the n carriers whose waveforms are orthogonal are divided by the data transmitting means into quarters of each wavelength. Wireless transmission is performed individually from n positions separated by one or more distances. Since the n carriers wirelessly transmitted in this way have different transmission paths, they have different fading characteristics, and a plurality of carriers are complemented by error correction.
Works the same as space diversity.

[0017] In the wireless transmission receiving apparatus of the invention of claim 3, wherein, in the radio receiving apparatus, the n carriers and is wirelessly received by a single location by the data receiving means, the received n-number of carrier Each of them is demodulated by data demodulation means in parallel one bit at a time. The demodulated parallel n-bit received data is serially converted by the data converting means, and the serial received data is decoded every n bits by the data decoding means. n
If the number of carriers is restored to serial transmission data and the transmission positions of n carriers are separated by more than a quarter of each wavelength, even a single reception position functions similarly to space diversity.

[0018] According to a fourth aspect of the present invention, there is provided a wireless transmission apparatus comprising:
The serial transmission data is converted into parallel data every k bits by the data conversion means, and this parallel k-bit transmission data is convolutionally coded every n bits by the data coding means. The convolutionally coded n-bit transmission data is multi-level modulated by the data modulating means into L carriers whose frequencies are separated every m bits, and the L carriers whose frequencies are separated are converted by the data transmitting means. Wireless transmission is performed individually from L positions separated from each other by a distance equal to or more than a quarter of each wavelength. The radio waves transmitted wirelessly in this manner have different fading characteristics due to different transmission paths, and a plurality of carriers are complemented by error correction, thus functioning similarly to space diversity.

According to the fifth aspect of the present invention,
The serial transmission data is converted into parallel data every k bits by the data conversion means, and the parallel k-bit transmission data is convolutionally coded every n bits by the data coding means. The convolutionally encoded n-bit transmission data is multi-level modulated by data modulating means into L (= n / m) carriers whose waveforms are orthogonal every m bits, and this waveform is orthogonal to L number of carriers. Carriers are individually wirelessly transmitted by the data transmitting means from L positions separated by a distance equal to or more than a quarter of each wavelength. The radio waves transmitted wirelessly in this manner have different fading characteristics due to different transmission paths, and a plurality of carriers are complemented by error correction, thus functioning similarly to space diversity .

[0020] In the wireless transmission receiving apparatus of the invention of claim 6, wherein, in the radio receiver, the L carriers and is wirelessly received by a single location by the data receiving means, the received L number of carrier Each is demodulated in parallel by m bits by the data demodulation means. The demodulated parallel n-bit received data is decoded by the data decoding means, and the decoded parallel k-bit received data is serially converted by the data converting means. If L carriers are restored to serial transmission data and the transmission positions of the L carriers are separated by more than a quarter of each wavelength, even one reception position functions similarly to space diversity. .

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same parts as those in the conventional example are denoted by the same names and reference numerals, and detailed description is omitted. First, the wireless communication system 9 of the present embodiment
Is formed by a combination of a wireless transmission device 10 and a wireless reception device 11, as shown in FIG.

In the wireless transmission apparatus 10 of the present embodiment, a data encoder 12 as data encoding means is connected to a data input section 2 to which transmission data is input serially.
The serial / parallel converter 3 as data conversion means is connected to the data encoder 12. To a parallel n-bit output terminal of the serial / parallel converter 3, n BPSK (Binary Phase-Shift Keying) modulators 13 are individually connected. These n BPSKs
The n frequency converters 6 are individually connected to the parallel n-bit output terminals of the modulator 13, and the n output terminals of the n frequency converters 6 have n parallel output terminals.
Transmission antennas 8 are individually connected.

The n transmitting antennas 8 individually transmit the n carriers whose frequencies are separated from each other by radio, but are arranged at n positions separated by a distance of not less than a quarter of each wavelength. Therefore, a data transmission mechanism 14 as data transmission means is formed here. The BPSK modulator 1
3 and the frequency converter 6 modulate n-bit parallel transmission data into n carriers whose center frequencies are separated from each other, and the separation distance of the center frequency is set to be about the band of the information signal. .

On the other hand, the radio receiving apparatus 11 of this embodiment has one receiving antenna 15 serving as data receiving means, and the receiving antenna 15 is connected to a frequency separator 16. The frequency converter 17 is connected to the parallel n output terminals of the frequency separator 16, and the parallel n output terminals of the frequency converter 17 are:
A BPSK demodulator 18 as data demodulation means is connected. One parallel / serial converter 19 as data conversion means is connected to n parallel output terminals of the BPSK demodulator 18. One output terminal of the parallel / serial converter 19 is A data decoder 20 as data decoding means is connected.

The receiving antenna 15 corresponds to a band capable of receiving all of the n carriers, and the frequency separator 16 includes a band filter (not shown) corresponding to each of the n carriers. To separate.

In such a configuration, the wireless communication system 9 of the present embodiment includes the wireless transmission device 10 and the wireless reception device 1
1 are exclusively formed and combined, and the wireless receiving device 11 receives wireless data transmitted by the wireless transmitting device 10.

More specifically, in the radio transmission apparatus 10, serial transmission data input to the data input unit 2 is linearly encoded by the data encoder 12 into (n, k) block codes. The serial transmission data is converted into parallel data by the serial / parallel converter 3 every n bits. This parallel n-bit transmission data is converted by the BPSK modulators 13 into BPs for each bit.
The SK-modulated, BPSK-modulated parallel n-bit transmission data is modulated by the n frequency converters 6 into n carriers whose center frequencies are separated from each other. Since the n carriers whose center frequencies are separated from each other are wirelessly transmitted from the n transmitting antennas 8 by the data transmitting mechanism 14 individually, the frequency is separated from the radio wave as shown in FIG. There are n carriers.

Then, in the radio receiving apparatus 11, when n carriers are received by one receiving antenna 15, each of the received n carriers is converted into a frequency separator 16
To separate them individually. The n carriers separated in this manner are frequency-converted by the frequency converter 17 in parallel one bit at a time, and BPSK demodulated by the BPSK demodulator 18 in parallel one bit at a time. The parallel received data of n bits thus demodulated is converted into serial data by the parallel / serial converter 19, and the serial received data is decoded every n bits.

As described above, in the wireless communication system 9 according to the present embodiment, when the wireless transmission device 10 converts serial transmission data into n carriers and wirelessly transmits the data, the wireless reception device 11 wirelessly receives the data. To restore the serial received data.

At this time, in the radio transmitting apparatus 10, n carriers are individually radio-transmitted by the n transmitting antennas 8, and the n transmitting antennas 8 divide the wavelengths of the carriers to be radio-transmitted into quarters. , The n carriers are transmitted to one receiving antenna 15 of the wireless receiving device 11 through paths whose fading characteristics are sufficiently different from each other. And, in this radio receiving apparatus 11, n carriers having sufficiently different fading characteristics can be complemented by error correction, so that even one receiving antenna 15 can function in the same manner as space diversity.

Further, since the fading characteristics of the n carriers are sufficiently different depending on the positions of the n transmitting antennas 8 as described above, if the center frequencies of the carriers are separated from each other by about the band of the information signal, Since the band required for wireless communication is not extremely large, it can be used even when the communication band is limited.

In the wireless transmission device 10 of the present embodiment,
As described above, when modulating parallel n-bit transmission data into n carriers for each bit, this method is called BPS
Although K is illustrated as an example, this may be any binary modulation, such as FSK (Frequency Shift Keying) and ASK (Ampli
Tude Shift Keying), PSK (Pulse Shift Keying), etc. can also be used.

Further, in the radio transmitting apparatus 10 of the present embodiment,
Although the BPSK modulator 13 as the data modulating means modulates the parallel n-bit transmission data to the n carriers having different frequencies on a bit-by-bit basis, the present invention is limited to the above embodiment. Instead, it is also possible to modulate parallel transmission data into n carriers having orthogonal waveforms on a bit-by-bit basis by a data modulator (not shown) as data modulation means.

In this case, as shown in FIG. 3, since the n carriers have orthogonal waveforms, the transmission band may be the same as the information band of the transmission data before processing. Assuming that a band required for wireless communication of such a carrier is B and a band of transmission data before encoding is W, the relationship between B and W at the time of executing (n, k) block encoding is “B = { (n + 1) / 2k} W "
And the condition that B does not exceed W is “n <(2k−
Therefore, if block coding is performed to satisfy this, the transmission band of n carriers does not increase from the data band before coding.

Further, in the radio receiving apparatus 11 of this embodiment,
Although the frequency separator 16 exemplifies that the n carriers are separated by band filters corresponding to the respective carriers, such separation of the carriers may be performed in a radio frequency band or a center frequency band. It is also possible to perform the switching with one band filter.

A second embodiment of the present invention will be described below with reference to FIG. In the present embodiment, the same portions as those in the first embodiment and one conventional example are denoted by the same names and reference numerals, and detailed description thereof will be omitted. First, the wireless communication system 21 of this embodiment also includes a wireless transmission device 22 and a wireless reception device 23.
Is formed in combination with the above.

The wireless transmission device 22 of the present embodiment has one data input unit 2, one serial / parallel converter 3, which is data conversion means, and data encoding means, like the wireless transmission device 1 of one conventional example. , One M convolutional encoder 4, L M-value modulators 5 as data modulating means, and L frequency converters 6 are connected in this order.
L transmission antennas 8 are individually connected to the frequency converters 6. These L transmission antennas 8 individually transmit n carriers whose frequencies are separated from each other by radio, similarly to the radio transmission apparatus 10 of the first embodiment, but have a distance of not less than a quarter of each wavelength. Since they are arranged at n positions apart from each other, a data transmission mechanism 14 as data transmission means is formed here.

On the other hand, the radio receiving apparatus 23 of the present embodiment is similar to the radio receiving apparatus 11 of the first embodiment in that one receiving antenna 15 serving as data receiving means is provided with a frequency separator 16 and a frequency converter 17. Are sequentially connected. An M-value demodulator 24 is connected to the parallel L output terminals of the frequency converter 17 as data demodulation means. A Viterbi decoder 25 as data decoding means is connected to n parallel output terminals of the M-value demodulator 24.
One parallel / serial converter 19 as data conversion means is connected to a k-bit parallel output terminal of the Viterbi decoder 25.

In such a configuration, also in the wireless communication system 21 of the present embodiment, the wireless transmission device 22 and the wireless reception device 23 are formed exclusively and combined, and the wireless data transmitted by the wireless transmission device 22 is transmitted. The wireless receiving device 23 receives.

More specifically, in the wireless transmission device 22, serial transmission data input to the data input unit 2 is converted into parallel data by the serial / parallel converter 3 for each k bits, and the parallel k-bit data is converted. The transmitted data is
The convolutional encoder 4 performs convolutional encoding every n bits. The n-bit transmission data convolutionally coded in this way is converted into M data by the L M-value modulators 5 every m bits.
It is value-modulated, and multi-value modulated by L frequency converters 6 into L carriers whose frequencies are separated. Since the L carriers whose frequencies have deviated in this manner are individually wirelessly transmitted from the L transmission antennas 8 by the data transmission mechanism 14, there are L carriers whose frequencies have deviated in this radio wave.

In the radio receiving apparatus 23, when the L carriers are received by one receiving antenna 15, each of the received L carriers is separated by the frequency separator 16
To separate them individually. The L carriers thus separated are frequency-converted by the frequency converter 17 in parallel one bit at a time, and M-value demodulator 24 demodulates the M value in parallel by one bit. The parallel n-bit received data thus demodulated is converted to a Viterbi decoder 25.
, And Viterbi-decoding into k bits, and the received data Viterbi-decoded into k bits are serially converted by the parallel / serial converter 19.

As described above, in the wireless communication system 21 of the present embodiment, when the wireless transmission device 22 converts serial transmission data into L carriers and wirelessly transmits the data, the wireless reception device 23 wirelessly receives the data. To restore the serial received data.

At this time, in the radio transmitting apparatus 22, the L carriers are individually transmitted by radio by the L transmitting antennas 8, and these L transmitting antennas 8 divide each of the wavelengths of the radio transmitting carriers by a quarter. Therefore, the L carriers are transmitted to one receiving antenna 15 of the wireless receiving device 23 through paths whose fading characteristics are sufficiently different from each other. Then, in this radio receiving apparatus 23, L carriers having sufficiently different fading characteristics can be complemented by error correction, so that even one receiving antenna 15 can function similarly to space diversity.

Further, since the fading characteristics of the L carriers are sufficiently different depending on the positions of the L transmitting antennas 8 as described above, if the center frequencies of the carriers are separated from each other by about the band of the information signal, Since the band required for wireless communication is not extremely large, it can be used even when the communication band is limited.

In addition, since each carrier is M-value modulated, it is possible to further reduce the communication band. Note that multi-level modulation of the carrier increases the error rate, which can be reduced by selecting the coding rate and the constraint length.

Further, in the radio transmission device 22 of this embodiment,
Although the M-value modulator 5 serving as the data modulating means modulates the parallel n-bit transmission data to L carriers whose frequencies are separated from each other on a bit-by-bit basis, the present invention is limited to the above embodiment. Instead, it is also possible to modulate parallel transmission data into L carriers having orthogonal waveforms on a bit-by-bit basis by a data modulator (not shown) as data modulation means.

In this case, since the L carriers have orthogonal waveforms, the transmission band may be the same as the information band of the transmission data before processing. Assuming that a band required for wireless communication of such a carrier is B and a band of transmission data before encoding is W, the relationship between B and W at the time of executing (n, k) block encoding is “B = { (n + 1) / 2k} W ", and the condition that B does not exceed W is" n <(2k-1) ". Therefore,
If block coding is performed to satisfy this, L
The transmission band of the number of carriers does not increase from the data band before encoding.

[0048]

According to the first aspect of the present invention, there is provided a radio transmitting apparatus comprising:
Data encoding means for encoding serial transmission data into an (n, k) block code; data conversion means for converting encoded serial transmission data into n-bit units in parallel; Data modulating means for modulating n carriers whose frequency is separated for each bit;
Data transmission means for wirelessly transmitting the n carriers separated in frequency from n positions separated in a distance of not less than one-fourth of each wavelength, so that the n carriers have fading characteristics. Each of the n carriers having sufficiently different fading characteristics can be complemented by error correction in the radio receiving apparatus, so that even one receiving position can be transmitted in space. It can function in the same way as diversity, and since the fading characteristics of n carriers differ depending on the transmission position, the center frequencies of the carriers need only be separated from each other by about the band of the information signal. Since the band is not extremely large, it can be used even when the communication band is limited.

According to a second aspect of the present invention, there is provided a wireless transmission apparatus, comprising: a data encoding means for encoding serial transmission data into an (n, k) block code; Data conversion means for converting parallel transmission data, data modulation means for modulating parallel transmission data into n carriers having orthogonal waveforms for each bit, and n carriers having orthogonal waveforms for each quarter of each wavelength By providing data transmission means for individually performing wireless transmission from n positions separated from one or more distances, n carriers can be transmitted on paths whose fading characteristics are sufficiently different from each other. Since n carriers having sufficiently different fading characteristics can be complemented by error correction in the wireless receiving apparatus, even if the number of the receiving positions is one, space n Since it can function in the same way as a city and the waveforms of n carriers are orthogonal, the transmission band may be the same as the information band of the transmission data before processing, and the band required for wireless communication needs to be expanded Because there is no
It can also be used when the communication band is limited.

The radio sending and receiving apparatus of the invention of claim 3, wherein the
3. A wireless transmission device according to claim 1, wherein said data reception means wirelessly receives n carriers at one position, and data which demodulates each of the received n carriers by one bit in parallel. A wireless receiving apparatus including: a demodulating unit; a data converting unit configured to convert the demodulated parallel n-bit received data to serial data; and a data decoding unit configured to decode the serial received data every n bits.
By doing so, the n carriers can be restored to serial received data, and the carriers to be restored can be complemented by error correction. If transmission is performed on sufficiently different paths, even a single reception position can function similarly to space diversity.

According to a fourth aspect of the present invention, there is provided a wireless transmission apparatus comprising: a data conversion means for converting serial transmission data into k-bit data in parallel; and data for convolutionally encoding parallel k-bit transmission data in n-bit data. Encoding means;
Data modulation means for multi-level modulating the convolutionally coded n-bit transmission data into L carriers whose frequencies are separated by m bits; and L carriers whose frequencies are separated by one-quarter of each wavelength. By providing data transmission means for individually performing wireless transmission from the L positions separated from the above distance, L carriers can be transmitted on paths whose fading characteristics are sufficiently different from each other. Since the L carriers having sufficiently different characteristics can be complemented by error correction in the radio receiving apparatus, even a single reception position can function in the same manner as space diversity, and each of the L carriers can be used. Since multi-level modulation is performed and the fading characteristics differ depending on the transmission position, the bandwidth required for wireless communication is not extremely large, and the communication bandwidth is limited. It can also be used when it is.

According to a fifth aspect of the present invention, there is provided a wireless transmitting apparatus, comprising: a data converting means for converting serial transmission data into k-bit data in parallel; and data for convolutionally encoding k-bit parallel transmission data in n-bit data. Encoding means;
Data modulation means for multi-level modulating the convolutionally coded transmission data of n bits to L carriers having orthogonal waveforms every m bits; and transmitting the L carriers having orthogonal waveforms to a quarter of each wavelength. By providing data transmission means for individually performing wireless transmission from the L positions separated from the above distance, L carriers can be transmitted on paths whose fading characteristics are sufficiently different from each other. Since the L carriers having sufficiently different characteristics can be complemented by error correction in the radio receiving apparatus, even a single reception position can function in the same manner as space diversity, and the waveform of the L carriers can be changed. Since they are orthogonal, the transmission band may be the same as the information band of the transmission data before processing, and there is no need to expand the band necessary for wireless communication. It can also be used if the signal bandwidth is limited.

[0053] radio transmission receiver of the invention described in claim 6,
6. The wireless transmission device according to claim 4, wherein: a data receiving unit that wirelessly receives the L carriers at one position; and data that demodulates each of the received L carriers in parallel by m bits. A radio receiving apparatus comprising: a demodulation unit; a data decoding unit for decoding demodulated parallel n-bit reception data; and a data conversion unit for converting the decoded parallel k-bit reception data into serial data.
And L, the L carriers can be restored to serial received data, and the restored carriers can be complemented by error correction. If the signals are transmitted on paths having sufficiently different fading characteristics, even a single reception position can function in the same manner as space diversity.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relationship between carriers and fading characteristics.

FIG. 3 is a characteristic diagram showing a relationship between a carrier and a fading characteristic according to a modified example.

FIG. 4 is a block diagram showing a wireless communication system according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional wireless transmission device.

FIG. 6 is a characteristic diagram showing a relationship between carriers and fading characteristics.

[Explanation of symbols]

 3 Data conversion means 4, 12 Data encoding means 5, 13 Data modulation means 10, 21 Radio transmission device 11, 23 Radio reception device 14 Data transmission means 15 Data reception means 18, 24 Data demodulation means 19 Data conversion means 20, 25 Data decryption means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-5642 (JP, A) JP-A-7-66739 (JP, A) JP-A-58-175333 (JP, A) JP-A-7- 7462 (JP, A). Leung, Stephen G .; Wilson, Multifrequency Trellis Coding with Low Delay for Fading Channels, IEEE Transaction on Communications, United States, IEEE Communications Communications. 41, No. 10, p. 1450-1459 (58) Field surveyed (Int.Cl. 7 , DB name) H03M 9/00 H04B 1/02-1/04 H04B 7/02-7/12 H04J 11/00 H04L 1/02-1 / 05

Claims (6)

(57) [Claims]
1. A data encoding means for encoding serial transmission data into an (n, k) block code, a data conversion means for converting encoded serial transmission data into n-bit units in parallel, Modulating means for modulating the transmission data into n carriers whose frequencies are separated by 1 bit, and n carriers separating the n carriers whose frequency is separated by a distance of not less than a quarter of each wavelength. And a data transmission means for individually performing wireless transmission from a position.
2. A data encoding means for encoding serial transmission data into an (n, k) block code; a data conversion means for converting encoded serial transmission data into n-bit units in parallel; Modulating means for modulating the transmission data into n carriers having orthogonal waveforms on a bit-by-bit basis, and n carriers having n orthogonal waveforms separated by a distance equal to or more than a quarter of each wavelength. And a data transmission means for individually performing wireless transmission from a position.
3. The wireless transmission according to claim 1,
Communication device, data receiving means for wirelessly receiving n carriers at one position, data demodulating means for demodulating each of the received n carriers in parallel one bit at a time, and demodulated parallel n bits data conversion means for converting the received data into serial, wireless transmission receiving apparatus characterized by comprising a radio receiving apparatus, the having a data decoding means for decoding the serial reception data for each n bits, the.
4. A data conversion means for converting serial transmission data into parallel data every k bits, a data coding means for performing convolution coding on parallel k-bit transmission data every n bits, and convolutionally coded data. data modulation means for multi-level modulating the n-bit transmission data into L carriers whose frequency is separated every m bits;
Wireless transmission means for individually transmitting wirelessly from L positions separated from each other by a distance equal to or more than a quarter of the wavelength of each of the plurality of carriers.
5. A data conversion means for converting serial transmission data into k bits in parallel, a data encoding means for convolutionally encoding k bits of parallel transmission data every n bits, and a convolutionally encoded data. data modulation means for multi-level modulating n-bit transmission data into L (= n / m) carriers whose waveforms are orthogonal every m bits; Data transmission means for individually performing wireless transmission from L positions separated by one or more distances.
6. A wireless transmission according to claim 4 or claim 5.
Communication device; data receiving means for wirelessly receiving L carriers at one position; data demodulating means for demodulating each of the received L carriers in m bits in parallel; and demodulated parallel n bits Wireless reception comprising: data decoding means for decoding the received data of (i), and data conversion means for converting the decoded parallel k-bit received data into serial data.
Radio sending and receiving apparatus characterized by comprising apparatus and, a.
JP11944995A 1995-05-18 1995-05-18 Wireless transmitting device and wireless transmitting / receiving device Expired - Fee Related JP3346945B2 (en)

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JP11944995A JP3346945B2 (en) 1995-05-18 1995-05-18 Wireless transmitting device and wireless transmitting / receiving device

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JP2008017415A (en) * 2006-07-10 2008-01-24 Mitsubishi Electric Corp Wireless communication system
WO2008108366A1 (en) 2007-03-06 2008-09-12 Mitsubishi Electric Corporation Radio communication system

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US6185266B1 (en) * 1997-10-07 2001-02-06 Motorola, Inc. Method and system for generating a power control metric in an orthogonal transmit diversity communication system
US6515978B1 (en) 1999-04-19 2003-02-04 Lucent Technologies Inc. Methods and apparatus for downlink diversity in CDMA using Walsh codes

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Yiuman S.Leung,Stephen G.Wilson,Multifrequency Trellis Coding with Low Delay for Fading Channels,IEEE Transaction on Communications,米国,IEEE Communications Society,Vol.41,No.10,p.1450−1459

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008017415A (en) * 2006-07-10 2008-01-24 Mitsubishi Electric Corp Wireless communication system
WO2008108366A1 (en) 2007-03-06 2008-09-12 Mitsubishi Electric Corporation Radio communication system
JPWO2008108366A1 (en) * 2007-03-06 2010-06-17 三菱電機株式会社 Wireless communication system

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