WO1999041865A1 - Procede de modulation, dispositif de modulation, procede de demodulation et dispositif de demodulation - Google Patents
Procede de modulation, dispositif de modulation, procede de demodulation et dispositif de demodulation Download PDFInfo
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- WO1999041865A1 WO1999041865A1 PCT/JP1999/000624 JP9900624W WO9941865A1 WO 1999041865 A1 WO1999041865 A1 WO 1999041865A1 JP 9900624 W JP9900624 W JP 9900624W WO 9941865 A1 WO9941865 A1 WO 9941865A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Definitions
- Modulation method Modulation method, modulation device, demodulation method and demodulation device
- the present invention provides an orthogonal frequency division multiplexing (hereinafter, referred to as 0 FDM) modulation method for generating a modulated signal, a modulation apparatus to which the modulation method is applied, and a 0 FDM-modulated signal.
- the present invention relates to a demodulation method for demodulating a demodulated signal and a demodulation device to which the demodulation method is applied, and more particularly to a technique suitable for processing an interleaved 0 FDM modulated signal.
- OFDM modulation has been put to practical use as one of the modulation schemes for transmitting relatively large amounts of digital data wirelessly.
- a tuner that receives television broadcasts and a playback device that plays back a video program recorded on a recording medium in a relatively small area such as at home or in an office.
- the video signal (digital video data) output from the configured video signal source 1 is supplied to the wireless transmission device 2, and the wireless transmission device 2 modulates the video signal into a signal subjected to 0 FDM modulation.
- the modulated signal is wirelessly transmitted from antenna 3 in a predetermined frequency band. Then, the wirelessly transmitted signal is transmitted to the wireless receiving device connected to the antenna 4.
- the video recording / reproducing device 6 to receive a video signal by demodulating the received 0 FDM wave in the frequency band, and supply the received video signal to the video recording / reproducing device 6 for a predetermined recording medium such as a video tape.
- the image data is supplied to the image receiver 7 for image receiving processing.
- the video signal recorded by the video recording / reproducing device 6 can be reproduced, and the reproduced signal can be supplied to the receiver 7 to receive the image.
- the antenna 3 connected to the wireless transmission device 2 and the antenna 4 connected to the wireless reception device 5 Wireless transmission during 0 FDM modulation enables large-volume digital data to be transmitted wirelessly and efficiently.
- FIG. 2 An example of a configuration in which the radio transmitting apparatus 2 performs 0 FDM modulation for transmission is shown in FIG. 2.
- the transmission signal (digital data) obtained at the input terminal 2a is converted into a serial / parallel signal.
- the data is supplied to the unit 2b and converted into parallel data for each specified unit.
- the parallel data converted by the serial / parallel converter 2b is supplied to the interleave memory 2c, and the order of writing to and reading from the memory 2c is changed, and the data is read.
- An interleave process that changes the array is performed, and the interleave parallel data is supplied to an inverse Fourier transform circuit (IFFT circuit) 2d, which performs an inverse fast Fourier transform operation.
- IFFT circuit inverse Fourier transform circuit
- an orthogonal transformation process is performed to transform the time axis into the frequency axis.
- the parallel-converted parallel data is supplied to a parallel / serial converter 2e to be converted into serial data, and the serial data is supplied to an output terminal 2f.
- the data obtained at the output terminal 2f is supplied to a transmission processing system, frequency-converted to a predetermined transmission frequency band, and transmitted by radio.
- FIG. 25 shows an example of a configuration in which a signal transmitted wirelessly is received by the wireless receiving device 5 and demodulated as shown in FIG. 25.
- a signal in a predetermined frequency band is received and the frequency is converted to an intermediate frequency signal or the like.
- the converted signal is obtained at the input terminal 5a, and the data obtained at the input terminal 5a is supplied to the serial / parallel converter 5b, where the data is converted into parallel data for each predetermined unit and converted.
- the output is supplied to a Fourier transform circuit (FFT circuit) 5c, which performs an orthogonal transform process that transforms the frequency axis into the time axis by an arithmetic process using fast Fourier transform.
- FFT circuit Fourier transform circuit
- the parallel-transformed parallel data is supplied to the memory 5 d for interleaving, and the order of writing and reading to the memory 5 d is changed, and the data array is changed.
- the parallel data that has been subjected to the deinterleave processing is supplied to a parallel Z-serial converter 5 e, which converts the parallel data into serial data, and converts the serial data to serial data.
- the modulation processing for generating the 0 FDM modulation signal in the configuration of FIG. 24 is basically the reverse of this demodulation processing, and requires the same period as the demodulation processing.
- the interleave processing is performed using the memory.
- the interleave processing is performed without using the memory.
- Fig. 29 shows an example of this case.
- the data obtained at the input terminal 5a is supplied to the serial / parallel converter 5b, which converts the data into parallel data every predetermined unit.
- the converted output is supplied to a Fourier transform circuit 5c, and the processing shown in FIG. 25 is performed until the orthogonal transform processing for transforming the frequency axis into the time axis in the arithmetic processing by the fast Fourier transform is performed. Is the same.
- the orthogonally transformed parallel data is subjected to a data arrangement changing process by a wiring change process 5 g corresponding to the interleave pattern, and the parallel data having the changed data array is subjected to a parallel / serial converter 5. e and converts it to serial data, and supplies that serial data to the output terminal 5f.
- the demodulation processing of the OFDM modulated signal performed by the configuration of FIG. 29 is executed at the timing shown in FIG. That is, first, there is a data input period T e to the Fourier transform circuit 5c, and then there is a Fourier transform processing period T f in which the Fourier transform circuit 5c performs a fast Fourier transform process. Next, there is an output period T g during which the Fourier-transformed data is output.
- the Fourier transform The signal is output from the path 5c and supplied to the parallel Z-serial converter 5e.
- FIG. 31 is a diagram showing an example of a conventional configuration in which this puncturing process is performed.
- Transmission data ai obtained at an input terminal 8a is convolutionally coded by a convolutional encoder 8b to form two sequences.
- Data Gl and G2 are generated, and the two series of data and G2 are supplied to a decimation processing circuit 8c, and decimation processing is performed to obtain punctured one-piece encoded data bi.
- Transmit data ai obtained at an input terminal 9a is supplied to a shift register 9b.
- the shift register 9b is a register composed of three stages.
- the shift register 9b supplies the stored data of the first stage and the stored data of the third stage to the adder 9c to perform addition processing to obtain data. Further, by adding the process by supplying the first stage of the storage data and the second-stage data stored in shift register 9 b to the adder 9 d, obtain data G 2.
- FIG. 33 shows the state of the thinning-out process 2, for example, data string a shown in A of FIG. 33. , Ai , a 2 ⁇
- the two convolutionally encoded data G, G 2 are represented by data g! . , G,:, 2 22 ⁇ and data g 20, g 21 , g 22 ' ⁇ .
- the decimation processing circuit 8c in the decimation processing circuit 8c
- the configuration for the puncturing processing becomes complicated. That is, as can be seen from FIG. 33 showing the puncture processing state, the clock rate of the input data (A in FIG. 33) and the punctured output data (B in FIG. 33) is an integer multiple. Regardless of the relationship, the 2Z3 clock of data clock j is required for the processing for the thinning processing, and the processing of generating such a clock is complicated. Was. In addition, processing for retiming the decimated data is required, which increases the circuit scale, consumes more power, and uses clocks with different frequencies.
- the occurrence of the spur has an adverse effect on a high-frequency circuit block that performs wireless transmission and reception processing of a modulated signal.
- Such adverse effects include, for example, deterioration of reception performance and occurrence of emission disturbance of out-of-band spurious radio waves.
- a first object of the present invention is to enable a modulation process for generating an interleaved OFDM modulation signal to be realized with a simple configuration and in a short processing time.
- a second object of the present invention is to enable a demodulation process of an interleaved 0FDM modulation signal to be realized with a simple configuration and in a short processing time.
- predetermined data is stored as N-system (N is an arbitrary integer) data—the N-system data is held, and the held N-system data is stored in a predetermined output order data.
- N is an arbitrary integer
- This is a modulation method in which the data is sequentially output in the order indicated by, and the output N data is converted into data distributed on the frequency axis at predetermined frequency intervals.
- This interleaves the order in which data is supplied for the inverse Fourier transform, simplifies the processing for the interleave processing, reduces the time required for the interleave processing, and modulates the data. Processing time can be reduced.
- a second invention provides the modulation method according to the first invention, wherein the output order is
- the data is a modulation method generated by a count process.
- the output order data is a modulation method for sequentially outputting previously prepared data.
- the interleaving process can be performed by a simple process of preparing the output order data in advance.
- one of the two systems of data generated by convolutional coding is delayed by one clock period of the data, and The data of the output system and the data of the system that is not delayed are sequentially output in the order shown in the predetermined output order, and the output data is displayed on the frequency axis at predetermined frequency intervals.
- This is a modulation method that converts the data into distributed data. As a result, it is possible to efficiently interleave the convolution-encoded data into an OFDM-modulated signal with simple processing and efficiently.
- a Q bit (Q is an integer of 2 or more) is used as a process of converting the data into data distributed on the frequency axis at the predetermined frequency interval.
- Q is an integer of 2 or more
- This is a modulation method that performs parallel processing on the data of the first step.
- data processing in units of a pad composed of a plurality of bits can be efficiently performed.
- a first interleaved data and a second interleaved data are generated from predetermined data, and the first and second interleaved data are generated. This is a modulation method in which data is simultaneously used and converted into data distributed on the frequency axis at predetermined frequency intervals.
- a seventh invention is the modulation method according to the sixth invention, wherein the first and second interleaved data are individually differentially encoded, and each of the differentially encoded data is encoded.
- This is a modulation method that is used at the same time to convert the data to data distributed on the frequency axis at predetermined frequency intervals. As a result, differential coding can be performed efficiently during interleaving.
- N registers (N is an arbitrary integer) to which predetermined data are supplied at the same time, and data specifying an output order of data supplied to the N registers are generated.
- Means for generating output order data to be converted, and the supplied N data are converted into data distributed on the frequency axis at predetermined frequency intervals in the order specified by the output order data generating means.
- This is a modulator provided with an inverse Fourier transform means.
- the data is interleaved when the data is input to the inverse Fourier transform means, so that a large-scale circuit such as memory for the interleaving is not required, and the input selection is not performed.
- the interleaving is performed, so that the interleaving process does not require much time for the modulation process.
- a ninth aspect of the present invention is the modulation apparatus according to the eighth aspect, wherein the output order data generation means uses a counter that sequentially generates data corresponding to the output order by a count process. It is. In this way, the output order data is generated by the counter processing by the counter, so that the signal order data can be easily generated by using the counter, and the interleave processing can be performed.
- a tenth aspect of the present invention is the modulation apparatus according to the eighth aspect, wherein the output order data generating means uses a shift register for sequentially outputting data prepared in advance. It is. Thus, the interleaving process can be performed with a simple configuration using the shift register.
- the convolutional coding means and the data of one of the two data streams encoded by the convolutional coding means are converted into A delay means for delaying one cycle of data, and a hold means for temporarily holding the output order data output by the output order data generation means, the delay being delayed by the delay means.
- a modulation device configured to supply data of one system and data of the other system output by the convolutional encoding means to the register. This makes it possible to interleave the convolutionally encoded data into an OFDM modulated signal efficiently with a simple configuration.
- the inverse Fourier transform means is a modulation device that performs parallel processing on data of Q bits (Q is an integer of 2 or more). Things. This makes it possible to efficiently process data in a unit of a packet composed of a plurality of bits with a simple configuration.
- the first and second interleaving means for interleaving predetermined data and the data output from the first and second interleaving means are different from each other.
- the modulator is provided with an inverse Fourier transform means for inputting the data to points and converting the data into data distributed on the frequency axis at predetermined frequency intervals. This makes it possible to provide a configuration in which the interleaved data can be input to the inverse Fourier transform means and processed in a short time.
- a fourteenth invention is a modulation device according to the thirteenth invention, wherein the first interleaving means differentially encodes an output of the first interleaving means, and the second interleaving means And second differential encoding means for differentially encoding the output of the first means, and modulating the encoded outputs of the first and second differential encoding means to the inverse Fourier transform means. It is a device. Because of this, it was interleaved Data can be differentially coded efficiently and inverse Fourier transformed.
- N is an arbitrary integer
- data of a point specified by predetermined output order data is selected from the N points of data and output.
- the deinterleaving process is performed in the process of selecting data to be output from the Fourier-transformed data, and the process for the deinterleaving process is simplified, and the deinterleaving process takes a long time. As a result, the time required for the demodulation processing can be reduced.
- a sixteenth invention is the demodulation method according to the fifteenth invention, wherein the output order data is sequentially generated by a count process.
- the signal order data can be easily generated by the count processing, and the deinterleaving processing can be performed.
- a seventeenth invention is the demodulation method according to the fifteenth invention, wherein the output river page data is a demodulation method for sequentially outputting previously prepared data.
- the deinterleaving process can be performed by a simple process of preparing the output order data in advance.
- the converted N-point data is converted into two sets of data, and from the two sets of data, the output order data is used.
- This is a demodulation method in which points are individually selected and output. This makes it easy to obtain demodulated data for a plurality of systems simultaneously.
- a nineteenth invention is a demodulation method according to the eighteenth invention, wherein differential demodulation is performed from two systems of data which are individually selected and output as points. This facilitates good differential demodulation processing.
- the 20th invention is a demodulation method according to the 19th invention, wherein the individual This is a demodulation method that delays one of the two data streams selected and output for a predetermined period. This enables appropriate selection processing.
- a demodulation method for performing video decoding from the two-system data output by individually selecting the above points can be performed.
- the converted N-point data is converted into four-system data, and the four-system data is individually voiced according to the output order data. And outputs the selected data, differentially demodulates the selected data from the first system and the data from the second system, and selects the data from the third system and the data from the fourth system. And a demodulation method of performing Viterbi decoding from the differentially demodulated data.
- a demodulation method of performing Viterbi decoding from the differentially demodulated data As a result, differential demodulation using the Fourier-transformed N-point data and Viterbi decoding from the differentially demodulated data can be performed, and differential demodulation and Viterbi decoding can be performed. good demodulated data we have obtained, et al is 0
- first and second two types of output order data are provided as the output order data, and the first and second output order data are used.
- the first system data is selected
- the second system data is selected by delaying the first output sequence data for a predetermined period
- the third system data is selected by the second output sequence data.
- a twenty-fourth invention is the demodulation method according to the twenty-second invention, wherein the data of the above four systems is a demodulation method that designates a point to be selected by each individually generated output order data. It is. This enables appropriate processing for each system of data.o
- the demodulation method in the demodulation method according to the twenty-second aspect, data of a third sequence is selected from the predetermined output order data, and a fourth sequence is selected from data obtained by delaying the predetermined output order data for a predetermined period.
- the first series of data is selected from the data obtained by adding a predetermined value to the predetermined output order data, and the data obtained by adding a predetermined value to the predetermined output order data is specified.
- This is a demodulation method that selects the data of the second stream from the data delayed for a period. As a result, one output order data is processed and used as data for selecting four series of data, so that Viterbi decoding based on two differential demodulated data can be performed with simple processing.
- the twenty-sixth invention is a Fourier transform that transforms data distributed on the frequency axis at predetermined frequency intervals into data of N points (N is an arbitrary integer) for each predetermined unit.
- This is a demodulation device provided with output order data generation means for generating data.
- a large-scale circuit such as a parallel / serial converter is not required, and since the interleave processing is performed simultaneously with the output selection, the demodulation processing is performed by performing the interleave processing. It doesn't take long.
- a twenty-seventh invention is the demodulation device according to the twenty-sixth invention, wherein the output order data generating means uses a counter for sequentially generating data corresponding to the output order by a count process. It is. This makes it possible to perform appropriate deinterleaving with a simple configuration using a counter.
- a twenty-eighth invention is the demodulation device according to the twenty-sixth invention, wherein the output order data generation means uses a shift register that sequentially outputs previously prepared data. . This allows proper deinterleaving with a simple configuration using shift registers.
- the N-point data output from the Fourier transform means is supplied to first and second selection means, and each of the selection means provides the data.
- This is a demodulation device that selects and outputs points individually based on the output of the output order data generating means. This makes it easy to obtain demodulation data for multiple systems simultaneously.
- a 30th invention is the demodulation device according to the 29th invention, wherein the data of the point selected by the first selection means and the data of the point selected by the second selection means are provided. And a demodulation device equipped with differential demodulation means for performing differential demodulation from the two systems. As a result, differential demodulation processing can be favorably performed with a simple configuration.
- the output of the output order data generation means is directly supplied to the first selection means, and the output is provided via a delay means for delaying a predetermined period.
- This is a demodulator to be supplied to the second selection means.
- an appropriate selection process can be performed by two selecting means with a simple configuration using only one output order data generating means.
- a thirty-second invention is the demodulation device according to the twenty-ninth invention, wherein the data of the point selected by the first selection means and the data of the point selected by the second selection means are provided. And a demodulator equipped with Viterbi decoding means for performing bi-bit decoding from the two systems. This makes it possible to perform Viterbi decoding satisfactorily from demodulated data of a plurality of systems obtained with a simple configuration.
- the N-point data output from the Fourier transform means is supplied to first, second, third, and fourth selection means.
- each selection means a point is individually selected based on the output of the output order data generation means, and the data of the point selected by the first and second selection means is transferred to the first point.
- the data of the point selected by the third and fourth selecting means is supplied to the second differential demodulating means and differentially demodulated by supplying the data of the point selected by the third and fourth selecting means.
- the data demodulated by the first and second differential demodulation means is supplied to a Viterbi decoding means to perform Viterbi decoding. As a result, Viterbi decoding based on the two differentially demodulated data can be performed satisfactorily.
- a thirty-fourth invention is the demodulation device according to the thirty-third invention, further comprising first and second output order data generating means as the output order data generating means, wherein the first output order data is The output of the generating means is directly supplied to the first selecting means, and is also supplied to the second selecting means via a delay means which is delayed for a predetermined period, and the second output order data is output to the second generating means.
- a demodulation device that supplies the output directly to the third selection means and supplies the output to the fourth selection means via a delay means that delays for a predetermined period. With this, it is possible to individually select the data of the bottle by four selecting means with a simple configuration.
- a thirty-fifth invention is the demodulation device according to the thirty-third invention, wherein This is a demodulator that supplies data specifying the points to be selected by the second, third, and fourth selection means from an output order data generation means that is separate for each selection means. This makes it easy to set an optimal selection state for each selection means.
- the output of the output order data generating means is directly supplied to the third selecting means, and the output is supplied via a first delay means which delays for a predetermined period.
- the second delay which supplies the output of the calculating means for adding a predetermined value to the output of the output order data generating means, is directly supplied to the first selecting means, and is delayed for a predetermined period.
- This is a demodulation device that supplies the signal to the second selecting means via the means.
- FIG. 1 is a block diagram showing a configuration example according to the first embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the register according to the first embodiment of the present invention.
- FIG. 3 is a frequency spectrum diagram showing an example of a frequency spectrum processed according to the present invention.
- FIG. 4 is a timing chart showing a modulation processing state according to the first embodiment of the present invention.
- FIG. 5 is a block diagram showing a configuration example according to the second embodiment of the present invention.
- FIG. 6 is a block diagram showing a configuration example according to the third embodiment of the present invention.
- FIG. 7 is a timing chart showing a processing state according to the third embodiment of the present invention. This is a so-called 9 ink 24 brush figure.
- FIG. 8 is a block diagram C ′ i illustrating a configuration example according to the fourth embodiment of the present invention.
- FIG. 9 is a block diagram showing a configuration example according to the fifth embodiment of the present invention.
- FIG. 10 is a timing diagram showing a processing state according to the fifth embodiment of the present invention.
- FIG. 11 is a block diagram showing a configuration example according to the sixth embodiment of the present invention.
- FIG. 12 is a block diagram showing a configuration example according to the seventh embodiment of the present invention.
- FIG. 13 is a block diagram showing a configuration example according to the eighth embodiment of the present invention.
- FIG. 14 is a timing diagram showing a processing state according to the eighth embodiment of the present invention.
- FIG. 15 is a block diagram showing a configuration example according to the ninth embodiment of the present invention.
- FIG. 16 is a block diagram showing a configuration example according to the tenth embodiment of the present invention.
- FIG. 17 is a block diagram showing a configuration example according to the eleventh embodiment of the present invention.
- FIG. 18 is a block diagram showing a configuration example according to the 12th embodiment of the present invention.
- FIG. 19 is a block diagram showing a configuration example according to the thirteenth embodiment of the present invention.
- FIG. 20 is a block diagram showing a configuration example according to the fourteenth embodiment of the present invention.
- FIG. 21 is a plot showing a configuration example according to the fifteenth embodiment of the present invention.
- FIG. 22 is a block diagram showing a configuration example according to the sixteenth embodiment of the present invention.
- FIG. 23 is a block diagram illustrating an example of the wireless transmission system.
- FIG. 24 is a block diagram showing an example of a modulation configuration of interleaved 0FDM waves.
- FIG. 25 is a block diagram showing an example of a conventional demodulation configuration of an interleaved 0FDM wave.
- FIG. 26 is a timing diagram showing a demodulation processing state according to the example of FIG.
- FIG. 27 is an explanatory diagram showing an example of the occurrence state of the burst error of the 0FDM wave.
- FIG. 28 is an explanatory diagram for comparing an error occurrence state depending on the presence or absence of the interleave.
- FIG. 29 is a block diagram showing another example of a conventional demodulation configuration of interleaved 0FDM waves.
- Figure 30 is an evening diagram showing the demodulation processing state according to the example of Figure 29.
- FIG. 31 is a block diagram showing an example of a conventional puncturing process configuration.
- FIG. 32 is a block diagram showing an example of a convolutional encoder.
- FIG. 33 is a timing diagram showing an example of a conventional puncturing process state.
- FIG. 1 is a diagram showing the configuration of the modulation section of this example.
- Transmission data a such as a baseband signal is supplied to an input terminal 101, and transmission data a obtained at this input terminal 101 ; Are interleaved and subjected to 0 FDM modulation.
- the transmission data a i obtained at the input terminal 101 is supplied to N (here, N is 6 4) registers 102 a, 102 b... 102 n. These N registers 102 a to 102 n are configured as registers with an address decoder. The configuration of the register with address decoder will be described later. Then, the outputs of the 64 registers with address decoders 102 a to 102 n are supplied to an inverse Fourier transform circuit (IFFT circuit) 105.
- IFFT circuit inverse Fourier transform circuit
- the inverse Fourier transform circuit 105 is a circuit that performs an orthogonal Fourier transform process in which a time axis is converted to a frequency axis and modulated by an inverse Fourier transform operation.
- an inverse Fourier transform circuit that performs a conversion process of N points (here, 64 points) is used, and the converted data is converted into N-bit (64-bit) parallel data.
- the parallel data output from the inverse Fourier transform circuit 105 is supplied to a parallel / serial converter 106 to be converted into serial data, and the serial data is subjected to OFDM modulation. And supply it to the output terminal 107 as yn. 0 FDM modulated data y n obtained at the output terminal 1 0 7 is supplied to a high-frequency circuits (not shown), performs transmission processing.
- the selector 18 2 is composed of two AND gates 18 2 a and 18 2 b and one OR gate 18 2 c.
- the address decoder 184 decodes the address data supplied from the counter to the address input terminal 183, and, based on the decoded output, obtains the data obtained at the input terminal 181. The process of selecting overnight is performed.
- the data selected by the selector 1822 is supplied to the D flip-flop 185 and latched, and the latched data is supplied to the output terminal 187.
- the clock is supplied from the clock input terminal 186 to the clock input terminal CK of the D flip-flop 185.
- the input decoder When the address decoder 184 detects the input from the terminal 183 of the address set in the decoder, the input decoder performs a process of recognizing the input data based on the detection signal. At other times, the data is kept as it is.
- the 6-bit address data from the counter 103 is supplied to the address decoders 2a to 102n.
- the counter 103 is a circuit that generates address data that specifies N (here, 64) registers 102 a to 102 n in a predetermined order by a count process.
- N here, 64
- the configuration is such that data designating each address in order is generated in an order corresponding to the interleave pattern of the 0 FDM modulation signal to be transmitted.
- data with values from 0 to 63 are generated in 6 bits. , 58, 63, for example, in the order shown in Table 1 below.
- a start pulse is sent from the modulation processing control means (not shown) to the counter 103 via the terminal 104. Is supplied, and the counter 103 starts counting by the supply of the start pulse. Further, in the example described here, the values from 25 to 38 are not counted.
- FIG. 4 is a timing diagram showing the state of the modulation processing in the circuit of this example.
- the processing state will be described below.
- the data obtained at the input terminal 101 is stored in the registers 102 a to l 0. 2 n, there is an input period T h to be input to the inverse Fourier transform circuit 105, and then the inverse Fourier transform circuit 105 performs an inverse fast Fourier transform process.
- There is a Tie-transformation processing period T i and then there is an output period T g in which the inverse Fourier-transformed data is output and subjected to parallel / serial conversion.
- data is interleaved in the input processing to the inverse Fourier transform circuit 105 using the registers 102a to 102n during the input period Th.
- the inverse Fourier transform circuit 105 when the inverse Fourier transform circuit 105 generates a 0 FDM modulated signal, input of data to the inverse Fourier transform circuit 105 In the process, an interleave process is performed.
- the configuration to be generated can be simplified. Also, regarding the processing time for generating the 0 FDM modulated signal, the processing time T 3 shown in FIG. 4 does not take extra time for interleaving, so that the memory is different from the conventional one.
- the processing can be performed in a shorter time. Specifically, if the inverse Fourier transform circuit performs 64 point modulation processing, the processing time corresponding to 64 clock periods of input data can be reduced.
- FIG. 5 is a diagram showing the configuration of the modulation section of the present example.
- the transmission data ai obtained at the input terminal 111 is interleaved and FDM modulated.
- the transmission data ai obtained at the input terminal 111 is supplied to N (here N is 64) registers 1 1 2a, 1 1 2b I do.
- N registers 1 12 a to l 12 n are configured as registers with an address decoder, and each has the same configuration as the register with an address decoder shown in FIG. Yes
- the address data supplied to each address decoder-equipped register 111a to 112n is supplied from a shift register 113.
- the shift register 113 has N address data preset in a predetermined order (interleave order).
- the shift register 113 is connected to a terminal 1 from a modulation processing control means (not shown).
- the output of the address data in that order is started by the start pulse supplied via 14.
- Each of the address decoder registers 1 12 a to 1 12 n outputs the set transmission data a i when the set address data is supplied.
- the outputs of the 64 address decoder registers 112a to 112n are supplied to an inverse Fourier transform circuit (IFFT circuit) 115.
- IFFT circuit inverse Fourier transform circuit
- the inverse Fourier transform circuit 115 is a circuit that performs an orthogonal transform process for converting the time axis into a frequency axis and modulating the frequency axis by an arithmetic process using the inverse Fourier transform.
- an inverse Fourier transform circuit that performs an N-point (64-point in this case) conversion process is used, and the converted data is converted into N-bit (64-bit) parallel data.
- the parallel data output from the inverse Fourier conversion circuit 115 is supplied to a parallel / serial converter 116 to be converted into serial data. Is supplied to the output terminals 117 as OFDM-modulated data yn. Obtained at output terminals 1 1 7 0
- the FDM-modulated data y n is supplied to a high-frequency circuit (not shown) to perform transmission processing.
- the other parts are configured in the same manner as the configuration described in the first embodiment described above, and the conversion processing in the Fourier transform circuit 115 is also performed by the Fourier transform described in the first embodiment. This is exactly the same as the processing in the circuit 105.
- the interleaving process since the shift register is used as the output order data generation means, the interleaving process must be performed in the order of the data to be stored in the shift register. Even if it is a complicated interleave pattern, it can be easily dealt with only by setting the data set in the shift register to the corresponding data.
- FIG. 6 is a diagram showing the configuration of the modulation unit of the present example.
- Transmission data ai such as a baseband signal is supplied to an input terminal 12 1
- transmission data ai obtained at the input terminal 12 1 is Interleaving and FDM modulation.
- the puncture processing of the convolutionally coded data is performed at the same time. In the following, the configuration is described.
- the transmission data ai obtained at the input terminal 1 2 1 is assumed to be two series of data convolutionally coded by the convolutional encoder 122, and one of the two series of data is The sequence data is delayed for one clock period by the delay circuit 123, and the delayed data and the undelayed sequence data are divided into N (64 in this case) data.
- the N registers 12 4 a to l 24 n are configured as registers with an address decoder, each of which is basically a register with an address decoder shown in FIG.
- the configuration is the same, and the address set in each address decoder is different. Note that the register shown in Fig. 2 has a configuration in which 1-bit data is set, but the registers 124a to l24n in this example have a configuration in which 2-bit data is set. I have.
- the address data supplied to each of the address decoder registers 124a to 124n is supplied from the counter 125.
- the counter 125 is provided as a means for generating data for specifying the interleaving order, and counts address data corresponding to the interleave pattern. , Supplied to each register 1 24 a to l 24 n.
- the counting in the counter 125 is started by a start pulse supplied via a terminal 127 from a control means (not shown) for the modulation processing.
- a hold controller 126 for temporarily stopping the count processing in the counter 125 is provided, and a start pulse supplied via the terminal 127 is provided. Hold timing is set.
- This hold operation is a periodic operation. For example, after the counter is operated continuously for two clock periods of input data, a process of holding the count value for one clock period is performed.
- Such a hold controller can be constituted by, for example, a ternary counter.
- the outputs of the 64 registers with address decoders 124 4 a to 124 ⁇ controlled in this way are converted to an inverse Fourier transform circuit (IF F ⁇ circuit).
- This inverse Fourier transform circuit 128 is a circuit that performs an orthogonal Fourier transform process in which a time axis is converted to a frequency axis and modulated by an inverse Fourier transform operation.
- the ⁇ point an inverse Fourier transform circuit that performs a conversion process of 64 points is used, and the converted data is output as N-bit (64-bit) parallel data.
- the parallel data output from the inverse Fourier transform circuit 128 is supplied to a parallel / serial converter 128 to be converted into serial data, and this serial data is set to 0. to the output terminal 1 3 0 as an FDM modulated data y n.
- OFDM modulated data y n obtained at the output terminal 1 3 0 is supplied to a high-frequency circuits (not shown), performs transmission processing.
- one of the two series of data input to the registers 124a to 124n is delayed by one clock period, so that puncturing is not performed.
- Symbols to be decimated for processing are simultaneously supplied to the registers 124a to 124n, and the operation of the power counters 125 immediately after the decimated evening is performed.
- Control to stop. With this control, the input to the inverse Fourier transform circuit 128 is in the state shown in D in FIG. 7, and the puncturing process in which predetermined symbols are thinned out is performed.
- the other parts are configured in the same manner as in the first embodiment described above, and the basic conversion processing in the Fourier transform circuit 128 is also described in the first embodiment. This is the same as the processing in the Fourier transform circuit 105.
- the data input to the Fourier transform circuit 128 is interleaved, convolutionally encoded, and punctured.
- the puncturing process can be easily performed. In other words, the operation of the counter only needs to be periodically controlled by the hold controller 126, and the clock rate as described in FIGS. 31 to 33 as a conventional example is sufficient.
- the puncturing process can be executed with a simple timing control without the need for conversion processing. Then, the puncturing process is performed simultaneously with the interleaving process, so that when performing both the puncturing process and the interleaving process, the circuit size can be reduced more than before. And the power consumption of the processing circuit can be reduced.
- the clock rate used for processing Since the clock can be processed only with the clock clock of the caddy, it is not necessary to prepare clocks of different rates, so that the configuration of the clock generation circuit is simpler and the different rates are different. There is no spurious interference caused by the clock.
- the address data corresponding to the interleave pattern is generated, but as described in the second embodiment, the address data is generated using the shift register. Is also good. In this case, if address data to be set in the shift register is configured so that the same address is repeated once in three cycles as shown in C in Fig. 7, for example, a hold controller is required. And the configuration can be simplified accordingly.
- the present invention is applied to a modulation unit in a transmission device that wirelessly transmits an OFDM modulated signal.
- FIG. 8 is a diagram showing the configuration of the register section of the modulation section of this example.
- the input terminals 13 la, 13 1 b ... 13 In (where n is an arbitrary number) have Q bits
- the word configuration data is supplied bit by bit. Here, it is assumed that one word and eight bits of data are supplied.
- the 1-word 8-bit data is supplied to the respective selectors 1332a, 1332b,..., 1332n, and the addresses detected by the address decoder 1333 are supplied to the selectors.
- the selection processing is performed collectively based on the selection.
- the address decoder 133 decodes the address value supplied to the terminal 134 from a counter or shift register (not shown).
- the data selected by the selectors 13 2 a to 13 2 ⁇ are supplied to the D flip-flops 13 35 a, 13 35 b ⁇ ⁇ ⁇ Set in synchronization with the clock supplied from D flip-flop 13 5 a, 13 5 ⁇ ) of the 13 5 ⁇ is transferred to terminals 13 7 a, 13 7 b, 13
- the data is supplied from n to an inverse Fourier transform circuit (not shown) as 8-word 1-word data.
- the other parts are configured in the same way as the configuration described in the first embodiment described above, and the conversion processing in the Fourier transform circuit is also performed in the Fourier transform circuit described in the first embodiment. Same as processing. However, in the case of this example, conversion processing is performed on data in a unit of a pad composed of a plurality of bits.
- FIG. 9 is a diagram showing the configuration of the modulation section of this example.
- Transmission data ai such as a baseband signal is supplied to an input terminal 141, and the transmission data ai obtained at the input terminal 141 is supplied to the input terminal 141.
- Interleaving and OFDM modulation are supplied to the input terminal 141.
- the transmission data ai obtained at the input terminal 141 is supplied to two shift registers 144 and 144 to be stored.
- the data set in each shift register is read out in a predetermined order corresponding to the interleave pattern and is simultaneously supplied to the inverse Fourier transform circuit.
- the inverse Fourier transform circuit 144 of the present example includes two input terminals 144a and 144b.
- the inverse Fourier transform circuit 144 is a circuit for performing an orthogonal transform process for converting the time axis to the frequency axis and modulating the same by an arithmetic process by the inverse Fourier transform.
- N points here, 64 points
- An inverse Fourier transform circuit that performs the conversion is used, and the converted data is output as N-bit (64-bit) parallel data.
- each of the shift registers 14 2 and 14 3 is also a register in which 32 points of data can be set.
- the parallel data output from the inverse Fourier transform circuit 144 is supplied to a parallel / serial converter 144 to be converted into a serial data, and the serial data is converted to 0 FDM. to the output terminal 1 4 6 as a modulated data y n.
- 0 FDM modulated data y n obtained at the output terminal 1 4 6 is supplied to a high-frequency circuits (not shown), performs transmission processing.
- FIG. 10 is a timing diagram showing the state of the modulation processing in the circuit of this example.
- the processing state will be described below.
- the data of 64 points obtained at the input terminal 14 1 is converted into 2 points.
- the data set in the two shift registers 14 2 and 14 3 are simultaneously inverted in the order set in the shift registers 14 2 and 14 3.
- the interleave processing period Tn may be a half period of the input period Tm.
- the clock period may be 32 clock periods.
- there is an inverse Fourier transform processing period To in which inverse fast Fourier transform processing is performed by the inverse Fourier transform circuit 144.
- the inverse Fourier transformed data is output and parallel Z serial transformed.
- the time required for in-recovery processing is reduced to half that of the conventional method. Therefore, the time required to generate the interleaved 0 FDM modulated signal can be reduced. That is, the time T 4 shown in FIG. 1 0, since the time required for Interleaving processing is short, can be treated with shorter time than the processing time in the modulation processing circuit shown in FIG. 2 4 as a conventional example. Specifically, if the inverse Fourier transform circuit performs the modulation processing of 64 points, the processing time corresponding to the 32 clock period of the input data can be reduced.
- a sixth embodiment of the present invention will be described with reference to FIG. Also in this example, similarly to the above-described first embodiment, the present invention is applied to a modulation unit in a transmitting apparatus that wirelessly transmits an OFDM modulated signal.
- FIG. 11 is a diagram showing the configuration of the modulation section of this example.
- Transmission data ai such as a baseband signal is supplied to an input terminal 151, and the transmission data obtained at the input terminal 15 1 ai is interleaved and 0 FDM modulated.
- the transmission data ai obtained at the input terminal 15 1 is supplied to two shift registers 15 2 and 15 3 and stored.
- the data set in the shift registers 15 2 and 15 3 are read out in a predetermined order corresponding to the interleave pattern.
- the data output from the shift registers 15 2 and 15 3 are supplied to differential encoding circuits 15 4 and 15 5 and differentially encoded, and the differential encoding is performed by each circuit.
- the obtained data is simultaneously supplied to two input terminals 1 56 a and 1 56 b of the inverse Fourier transform circuit 15 6.
- the inverse Fourier transform circuit 156 is a circuit that performs an orthogonal Fourier transform process in which a time axis is converted into a frequency axis and modulated by an inverse Fourier transform.
- an inverse Fourier transform circuit that performs conversion processing of N points (here, 64 points) is used, and the converted data is output as N-bit (64-bit) parallel data.
- N-bit 64-bit
- input data of 32 points of 0 to 31 is input from input terminal 156a
- data of 32 points of 32 to 63 is input from input terminal 156b.
- each of the shift registers 15 2 and 15 3 is also a register in which 32 points of data can be set.
- the parallel data to the inverse Fourier transform circuit 1 5 6 outputs, the parallel / supplied to serial converter 1 5 7 a serial data output terminal of the serial data as an OFDM modulated data y n Supply 1 5 8 0 FDM modulated data y n obtained at the output terminal 1 5 8 is supplied to a high-frequency circuits (not shown), performs transmission processing.
- the time required for the interleaving process can be reduced to half of the conventional case, as in the case of the fifth embodiment. This can reduce the time required to generate the interleaved 0 FDM modulated signal.
- the differential encoding process since the differential encoding process is performed at the input of the inverse Fourier transform circuit, the differentially encoded data can be subjected to 0 FDM modulation, and the differentially encoded data can be differentially encoded. • Efficient FDM modulation based on data
- FIG. 12 is a diagram showing the configuration of the modulation unit of the present example.
- Transmission data ai such as a baseband signal is supplied to an input terminal 161, and transmission data ai obtained at the input terminal 161 is transmitted to the input terminal 161.
- the data set in the shift registers 16 2 and 16 3 are read out in a predetermined order corresponding to the interval.
- the reading order is reversed between the shift register 162 and the shift register 163.
- shift register 162 reads the set data from the beginning
- shift register 163 reads the set data from the end.
- the inverse Fourier transform circuit 166 is a circuit for performing an orthogonal transform process for converting a time axis into a frequency axis and modulating the same by an arithmetic process by an inverse Fourier transform.
- an inverse Fourier transform circuit that performs a conversion process of N points (here, 64 points) is used, and the converted data is converted into N-bit (64-bit) parallel data. And output.
- each of the shift registers 16 2 and 16 3 is also a register in which data of 32 points can be set.
- the parallel de-parameter output from the inverse Fourier transform circuit 166 is converted to a signal.
- the serial data is supplied to a parallel / serial converter 1667, and the serial data is supplied to an output terminal 1668 as 0 n FDM modulated data. OFD obtained at output terminal 1 6 8
- M modulated data y n is supplied to a high-frequency circuits (not shown), performs transmission processing.
- the time required for the interleaving process can be reduced to half that of the conventional case, as in the case of the fifth and sixth embodiments. Therefore, the time required for generating the interleaved 0 FDM modulated signal can be reduced.
- the differential encoding processing is performed at the input of the inverse Fourier transform circuit, so that the differentially encoded data is FDM modulation can be performed, and efficient 0 FDM modulation can be performed based on differentially encoded data.
- the order of reading data from the two shift registers 16 2 and 16 3 is set in reverse, so that a more complicated interleave pattern can be used. it can.
- the OFDM modulated signal generated by the configuration of the sixth embodiment is the signal shown in B of FIG. 3, the configuration of the present embodiment (seventh embodiment)
- the FDM modulated signal generated at 0 is the signal points 3 9 to 6 3 (-
- the data array of 25-1-1) is reversed from that of the sixth embodiment.
- FIG. 13 is a diagram showing the configuration of the demodulation unit of the present example.
- the input terminal 11 is supplied with a 0 FDM modulated signal received and converted into an intermediate frequency signal (or baseband signal).
- the 0 FDM modulated signal obtained in 1 is supplied to a serial / parallel converter 12 and converted into parallel data of a predetermined bit (here, 64 bits).
- 64 4-bit parallel output from serial / parallel converter 12 Rude is supplied to the Fourier transform circuit 13 and is subjected to an orthogonal transform process for converting the frequency axis to the time axis and demodulating the data by a fast Fourier transform.
- An N-point is generated, and an N-bit output register (not shown) provided in the output unit of the free-transform circuit 13 is set to an M-bit data one point at a time.
- the 12-bit data of 64 points output from the Fourier transform circuit 13 — ⁇ ⁇ ⁇ are simultaneously supplied to the selector 14. This selector
- a process for sequentially selecting points to be output is performed according to data specifying the points to be output by the counter 15 as output order data generating means, and the selected points are output.
- the 12-bit data a k is supplied to the output terminal 16.
- the counter 15 is a circuit for generating data specifying 64 points from 0 to 63 in a predetermined order by a count process, where the data is applied to the received 0 FDM modulation signal.
- the configuration is such that data specifying each point in order is generated in an order corresponding to the interleave pattern.
- a counter that generates data of values from 0 to 63 in 6 bits is used. For example, in the order shown in Table 1 below, 0, 5, 10, 0, 15, ... ⁇ Count processing is performed so as to reach 58 and 63.
- the Fourier transform circuit 13 performs one unit of conversion. Every time, an output pulse is output to the counter 15, and the supply of the output pulse causes the power supply 15 to start the counting process. Also, in the example described here, the values from 25 to 38 may not be counted.
- selector 1 4 6 4 is subjected fed POI down bets 1 2 bits with Dinner Isseki ⁇ Y n ⁇ is the order by count down preparative output of the counter 1 5
- FIG. 14 is a timing diagram showing a demodulation processing state in the circuit of the present embodiment. The processing state will be described below.
- A) Power is supplied to the serial / parallel converter 12, the Fourier transform circuit 13, and the counter 15, and processing is performed in each circuit in synchronization with the clock signal.
- input data (B in Fig. 14) is supplied in synchronization with the clock signal.
- start pulse (Fig. 14 C) is supplied from an external controller (not shown) to the Fourier transform circuit 13, and the fast Fourier transform process (FFT process) in the Fourier transform circuit 13 is started.
- conversion processing of input data ⁇ X k ⁇ is performed for a predetermined period.
- the conversion process is 6 4 Poi down bets data were ⁇ Y n ⁇ is output processing as shown in ⁇ in Fig 4, it is supplied to the selector 1 4 Will be.
- the output is started from the Fourier transform circuit 13
- the output pulse synchronized with the output (F in FIG. 14) is strong and is supplied from the Fourier transform circuit 13 to the counter 15. .
- the output pulse may be supplied to the counter 15 from another circuit.
- the Fourier transform is performed when the 0 FDM modulated signal subjected to the interleaving process is received and subjected to the orthogonal transform process.
- a Din-Eleave process is performed to return the interleaved data to the original array. Therefore, with a simple configuration that does not require a memory that performs deinterleaving processing and wiring change processing for deinterleaving as in the past, 0 FDM modulated signal And the demodulation configuration of the interleaved 0 FDM modulated signal can be simplified.
- a parallel / serial converter is not required, and input terminals 11 to 16 (see Fig. 29).
- Circuit size from terminal 5a to terminal 5 ⁇ ) can be significantly reduced, and the area of the board on which the circuit corresponding to this part is assembled can be reduced by wiring Can be reduced to about 1/3.
- a similar substrate area can be reduced as compared with the case where deinterleaving processing is performed using a memory.
- the selection processing by the selector 14 is performed at the same time as the output from the Fourier transform circuit 13, so that the selection processing does not take extra time.
- the processing time does not become long due to the deinterleaving processing, unlike the case of performing the deinterleaving processing using memory or the like.
- An input terminal 21 is supplied with a 0 FDM modulated signal received and converted into an intermediate frequency signal (or a base span signal).
- the 0 FDM modulated signal obtained at the input terminal 21 is supplied to the serial / parallel converter 22 to be converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 22 is supplied to a Fourier transform circuit 23, which performs an orthogonal transform process for converting the frequency axis to the time axis and demodulating it by a fast Fourier transform. Then, N bits of M-bit data are generated, and the Fourier transform circuit 2 The M-bit data is set in the N output registers (not shown) of the output unit 3 one point at a time.
- the N-point data output from the Fourier transform circuit 23 is supplied to the selector 24 at the same time.
- the selector 24 performs a process of sequentially selecting the points to be output according to the data specifying the points to be output by the shift register 25 as the output sequence data generating means.
- the data of the selected point is supplied to output terminal 26.
- the shift register 25 is a register (here, for example, 50 bits stored) in which the data for specifying the point to be selected is stored in the output order.
- the output pulse is supplied, the stored data of a plurality of words is output one word at a time for each clock and supplied to the selector 24.
- the order in which the stored multiple codes are output is such that data designating each point in order is output in an order corresponding to the interleaving pattern applied to the received 0 FDM modulation signal. Set in advance.
- the other parts are configured in the same manner as the configuration described in the eighth embodiment described above, and the conversion process in the Fourier transform circuit 23 is also performed in the Fourier transform circuit 1 described in the eighth embodiment. It is completely the same as the processing in 3.
- the shift register is used as the output order data generating means, the interleave processing is performed in the order of the data to be stored in the shift register. Even in the case of a complicated interleave pattern, it can be easily dealt with only by setting the data set in the shift register to the corresponding data.
- FIG. 16 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 31 is supplied with a 0 FDM modulated signal received and converted into an intermediate frequency signal (or baseband signal).
- the 0 FDM modulated signal obtained at the input terminal 31 is supplied to a serial / parallel converter 32 to be converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 32 is supplied to a Fourier transform circuit 33, which performs an arithmetic processing by a fast Fourier transform to perform an orthogonal transform process in which a frequency axis is converted to a time axis and demodulated. Then, an M-bit data is generated at N points, and the M-bit data is stored in N output registers (not shown) of the output unit of the Fourier transform circuit 33 one point at a time. Set.
- the N-point data output from the Fourier transform circuit 33 is simultaneously supplied to the first selector 34 and the second selector 35, respectively.
- the first selector 34 performs a process of sequentially selecting points to be output according to data specifying the points to be output by the first counter 36 as output order data generating means.
- the data of the specified point is supplied to the output terminal 38.
- the second selector 35 a process of sequentially selecting points to be output is performed based on data designating points output by the second counter 37 as output order data generating means.
- the data of the selected point is supplied to output terminal 39.
- the first and second counters 36 and 37 are circuits for generating data designating N points in a predetermined order by a count process.
- the first and second counters are applied to the received 0 FDM modulation signal.
- the output pulse is supplied from the Fourier transform circuit 33 and the like, and the data is generated.
- the timing at which the count data is output from the first counter 36 is different from the evening timing at which the count data is output from the second counter 37. Timing (for example, timing with a predetermined phase shift).
- the other parts are configured in the same way as the configuration described in the eighth embodiment described above, and the conversion processing in the Fourier transform circuit 33 is also performed by the Fourier transform circuit 13 described in the eighth embodiment.
- the process is exactly the same as
- the configuration of the tenth embodiment two systems of data having different timings can be obtained as the orthogonally transformed data, so that the two systems of received data are demodulated and decoded. It is suitable when necessary for processing.
- the counters 36 and 37 are used as output order data generating means.
- a shift register may be used.
- FIG. 17 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 41 is supplied with the 0 FDM modulated signal received and converted into an intermediate frequency signal (or base span signal).
- the OFDM modulated signal obtained at the terminal 41 is supplied to a serial / parallel converter 42 to be converted into a predetermined bit of parallel data.
- the parallel data output from the serial / parallel converter 42 is supplied to a Fourier transform circuit 43, which performs arithmetic processing by a fast Fourier transform. Performs orthogonal transform processing to convert the frequency axis to the time axis and demodulate.
- N points of M-bit data are generated, and M-bit data is set to N output registers (not shown) provided in the output unit of the Fourier transform circuit 43 one point at a time. .
- the N-point data output from the Fourier transform circuit 43 is simultaneously supplied to the first selector 44 and the second selector 45, respectively.
- the first selector 44 a process of sequentially selecting points to be output is performed according to data designating points output by the first counter 46 as output order data generating means.
- the data at the selected point is supplied to one input of a differential demodulation circuit 48.
- the second selector 45 performs a process of sequentially selecting points to be output based on data specifying the points output by the second counter 47 as output order data generating means. Then, the data of the selected point is supplied to the other input of the differential demodulation circuit 48.
- the first and second counters 46 and 47 are circuits for generating data designating N points in a predetermined order by a count process.
- the first and second counters 46 and 47 are applied to the received 0 FDM modulation signal.
- the data is generated by designating each point in order in the order corresponding to the obtained interleave pattern.
- the output pulse is supplied from the Fourier transform circuit 43 or the like, the data is generated. Perform processing.
- the timing at which the count data is output from the first counter 46 and the timing at which the count data is output from the second counter 47 are different. , And different timings (timings with a predetermined phase shift).
- differential demodulation processing is performed using the two systems of data supplied with a predetermined phase shift to obtain differentially demodulated data, and the demodulated data is output to an output terminal. From 9 to the subsequent circuit Pay.
- the other parts are configured in the same manner as the configurations described in the above embodiments, and the conversion processing in the Fourier transform circuit 43 is also performed by the processing in the Fourier transform circuit 13 described in the eighth embodiment. It is exactly the same.
- the circuit 48 performs differential demodulation processing, good demodulation data can be obtained by differential demodulation processing, and the received data of two systems required for differential demodulation can be subjected to interleave processing with a simple configuration. With this simple configuration, it is possible to receive and demodulate the 0 FDM modulated signal obtained and subjected to the interleaving process.
- the counters 46 and 47 are used as output order data generating means. However, as described in the ninth embodiment. Alternatively, a shift register may be used.
- FIG. 18 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 51 is supplied with a 0 FDM modulated signal received and converted into an intermediate frequency signal (or baseband signal).
- the 0 FDM modulated signal obtained in 1 is supplied to a serial Z parallel converter 52 to be converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 52 is supplied to a Fourier transform circuit 53, which performs an arithmetic processing by a fast Fourier transform to transform the frequency axis to the time axis and demodulate the quadrature. Perform the conversion process , M bits of data are generated at N points, and M bits of data are set in N output registers (not shown) of the output unit of the Fourier transform circuit 53 one point at a time. Let it.
- the N-point data output from the Fourier transform circuit 53 is simultaneously supplied to the first selector 54 and the second selector 55, respectively.
- the first selector 54 a process for sequentially selecting points to be output is provided by directly supplying data specifying points to be output by the counter 56 as output order data generating means. Is performed, and the data of the selected point is supplied to one input section of the differential demodulation circuit 58.
- the second selector 55 performs a process of sequentially selecting the points to be output based on the data specifying the point output from the counter 56 and the data delayed by a predetermined phase by the delay circuit 57. The data of the selected point is supplied to the other input of the differential demodulation circuit 58.
- the count 56 specifies data that specifies N points in a predetermined order.
- the data that specifies each point in order is generated in the order corresponding to the interleave pattern applied to the received OFDM modulation signal.
- the output pulse is supplied from the Fourier transform circuit 53 or the like, and the generation process is performed.
- the differential demodulation circuit 58 performs differential demodulation processing using two systems of data supplied with a predetermined phase shift, obtains differentially demodulated data, and outputs the demodulated data to an output terminal. Supplied from 9 to the subsequent circuit.
- the other parts are configured in the same way as the configurations described in the above embodiments, and the conversion processing in the Fourier transform circuit 53 is also performed by the Fourier transform circuit 13 described in the eighth embodiment. It is exactly the same as the processing of.
- the configuration of the first embodiment two systems with phase shifts are obtained as orthogonally transformed data, and differential demodulation is performed based on the two systems of received data. Since differential demodulation processing is performed by the circuit 58, good demodulated data can be obtained by differential demodulation processing as in the case of the fourth embodiment.
- the configuration of the present embodiment In the case of the configuration of the present embodiment,
- the count output of one counter 56 is directly supplied to the first selector 54, the count output is delayed by a predetermined phase by the delay circuit 57 and supplied to the second selector 55.
- the two selectors 54, 55 can perform selection processing at the appropriate timing, which simplifies the configuration.
- the counter 56 is used as the output order data generating means.
- the shift A register may be used.
- FIG. 19 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 61 receives a 0 FDM modulated signal as an intermediate frequency signal (or a baseband signal) and supplies the signal to the input terminal 6.
- the 0 FDM modulated signal obtained in 1 is supplied to a serial / parallel converter 62 and converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 62 is supplied to a Fourier transform circuit 63, and is subjected to an orthogonal transform process for converting a frequency axis to a time axis and demodulating the data by an arithmetic processing by a fast Fourier transform.
- M bits of data are generated at N points, and one point is stored at N output registers (not shown) provided in the output unit of the Fourier transform circuit 63. Set M-bit data each time.
- the N-point data output from the Fourier transform circuit 63 is simultaneously supplied to the first selector 64 and the second selector 65, respectively.
- first selector 64 data specifying a point output by the first counter 66 as output order data generating means is used.
- a process of sequentially selecting the points to be output is performed, and the data of the selected points is supplied to one input unit of the Viterbi Decoder 68.
- the second selector 65 a process of sequentially selecting points to be output is performed according to data designating points output by the second counter 67 as output order data generating means. The data of the selected point is supplied to the other input of the video decoder 68.
- the first and second counters 66 and 67 are circuits for generating data designating N points in a predetermined order by a count process.
- the first and second counters are applied to the received 0 FDM modulation signal.
- each point is specified in order in the order corresponding to the set in-leave pattern, and the output pulse is supplied from the Fourier transform circuit 63 or the like.
- the timing at which the count data is output from the first counter 66 and the timing at which the count data is output from the second counter 67 are different. Are different timings (predetermined phase-shifted timings).
- the Viterbi decoder 68 performs a Viterbi decoding process using the two systems of data supplied after a predetermined phase shift, obtains a Viterbi-decoded decoded data, and outputs the decoded data to an output terminal 6. Supply from 9 to the subsequent circuit.
- the other parts are configured in the same manner as the configurations described in the above-described embodiments, and the conversion processing in the Fourier transform circuit 63 is performed in the same manner as in the eighth embodiment. This is exactly the same as the processing in the Fourier transform circuit 13 described in the embodiment.
- the configuration of the thirteenth embodiment as orthogonally transformed data, two sets of phase-shifted data are obtained, and a Viterbi decoder 6 is obtained based on the two sets of received data. Since Viterbi decoding is performed in step 8, good decoded data can be obtained by Viterbi decoding, and the received data of two systems required for Viterbi decoding is deinterleaved with a simple configuration. It is possible to receive and decode the 0 FDM modulated signal obtained and subjected to the interleaving process with a simple configuration.
- the counters 66 and 67 are used as output order data generating means.
- a shift register may be used.
- FIG. 20 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 71 is supplied with a 0 FDM modulated signal received and converted into an intermediate frequency signal (or a baseband signal).
- the 0 FDM modulated signal obtained in 1 is supplied to a serial / parallel converter 72 and converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 72 is supplied to a Fourier transform circuit 73, which performs an arithmetic processing by a fast Fourier transform to transform the frequency axis to the time axis and demodulate the orthogonal transform.
- the processing is performed to generate N points of M-bit data, and the M-bit data is transferred to N output registers (not shown) provided in the output unit of the Fourier transform circuit 73 one point at a time.
- N-point data output by the Fourier transform circuit 73 is simultaneously sent to the first, second, third and fourth selectors 74a, 74b, 74c and 74d, respectively. Supply.
- the point to be output is supplied by directly supplying data specifying the point to be output by the first counter 75a as the output order data generating means. Processing for sequentially selecting is performed, and data of the selected point is supplied to one input section of the first differential demodulation circuit 77a.
- the first counter 75 a is used to output the data for specifying the point to be output strongly, using the data delayed by a predetermined phase by the delay circuit 76 a. Are sequentially selected, and the data of the selected point is supplied to the other input section of the first differential demodulation circuit 77a.
- the data for specifying the point output by the second counter 75 b as the output order data generation means is directly supplied, so that the point to be output is output. Then, the data of the selected point is supplied to one input section of the second differential demodulation circuit 77b.
- the fourth selector 74 d outputs a data specifying the point output by the second counter 75 b based on data delayed by a predetermined phase by the delay circuit 76. Is sequentially performed, and the data at the selected point is supplied to the other input section of the second differential demodulation circuit # 7b.
- the first and second counters 75a and 75b are circuits for generating data specifying N points in a predetermined order by a count process.
- the data that specifies each point in order is generated in the order that corresponds to the data input and output performed on the output data from the Fourier transform circuit 73 and the like.
- the generation of the data is performed by the supply of luz.
- the first, The timing at which the second counters 75a and 75b count is set to a timing shifted by a predetermined amount.
- first and second differential demodulation circuits 77a and 77b differential demodulation processing is performed by using two systems of data supplied with a predetermined phase shift, and the differential demodulation is performed. Demodulated data is obtained, and each demodulation circuit 7
- the demodulated data of 7a and 77b are supplied to one input of the Viterbi decoder 78 and the other input.
- the Viterbi decoder 78 performs Viterbi decoding using the supplied two systems of demodulated data, obtains Viterbi-decoded data, and supplies the decoded data from an output terminal 79 to a subsequent circuit.
- the other parts are configured in the same way as the configurations described in the respective embodiments after the eighth embodiment, and the conversion processing in the Fourier transform circuit 73 is also performed in the eighth embodiment. This is exactly the same as the processing in the described Fourier transform circuit 13.
- the two sets of differential demodulation circuits 77a and 77b individually performed differential demodulation based on the four sets of received data. Since the Viterbi decoder 78 performs Viterbi decoding on the two sets of differentially demodulated data, Viterbi decoding can be favorably performed based on the differentially demodulated data. In the case of the configuration of the present embodiment, the count outputs of the counters 75a and 75b are supplied directly to the first and third selectors 74a and 74c, and the delay is performed.
- Circuits 76a and 76b delay the phase by a predetermined amount and supply them to the second and fourth selectors 74b and 74d, so that two output sequences such as two counts are output. Only by providing the data generation means, the selection processing can be performed at an appropriate timing by the four selectors 74a to 74d, and the configuration can be simplified accordingly.
- the output order data Although a counter is used as the data generating means, a shift register may be used as described in the ninth embodiment.
- FIG. 21 is a diagram showing the configuration of the demodulation unit of this example.
- the input terminal 81 is supplied with a 0 FDM modulated signal which is received and converted into an intermediate frequency signal (or baseband signal).
- the OFDM modulated signal obtained in (1) is supplied to a serial / parallel converter 82 to be converted into parallel data of a predetermined bit.
- the parallel data output by the serial Z-parallel converter 82 is supplied to a Fourier transform circuit 83, where the frequency axis is converted to a time axis and demodulated by high-speed Fourier transform arithmetic processing.
- the orthogonal transform processing is performed to generate N points of M-bit data, and the Fourier transform circuit 8
- the N-point data output from the Fourier transform circuit 83 is simultaneously output to the first, second, third and fourth selectors 84a, 84b, 84c and 84d, respectively.
- the first selector 84a is supplied with data designating a point to be output by the first counter 85a as output order data generating means, thereby outputting a point.
- a process of sequentially selecting the data is performed, and the data of the selected point is supplied to one input section of the first differential demodulation circuit 86a.
- the second selector 84b the process of sequentially selecting the points to be output is performed by supplying the data specifying the points to be output by the second counter 85b. Then, the data of the selected point is supplied to the other input of the first differential demodulation circuit 86a. Pay.
- the third selector 84c data specifying a point to be output by the third counter 85c as output order data generating means is supplied, so that a point to be output is obtained. Are sequentially performed, and the data of the selected point is supplied to one input section of the second differential demodulation circuit 86b.
- the fourth selector 84 d the data for specifying the points to be output by the fourth counter 85 d is supplied, and the processing for sequentially selecting the points to be output is performed. The data at the selected point is supplied to the other input of the second differential demodulation circuit 86b.
- Each of the counters 85a to 85d is a circuit for generating data designating N points in a predetermined order by a count process.
- an interface applied to the received 0 FDM modulation signal is used.
- the configuration is such that data specifying each point in order is generated in an order corresponding to the waveform pattern, and the data is generated by supplying output pulses from the Fourier transform circuit 83 or the like.
- the timing at which each of the counters 85a to 85d counts is set to a timing shifted by a predetermined amount for each counter.
- the first and second differential demodulation circuits 86a and 86b perform differential demodulation processing using two sets of data supplied with a predetermined phase shift, respectively, and perform differential demodulation. Demodulated data is obtained, and the demodulated data of the respective demodulation circuits 86a and 86b are supplied to one input terminal of the Viterbi decoder 87 and the other input portion.
- the Viterbi decoder 87 performs Viterbi decoding using the supplied two systems of demodulated data, obtains Viterbi-decoded data, and supplies the decoded data from the output terminal 88 to the subsequent circuit. .
- the other parts are configured in the same way as the configurations described in the respective embodiments after the eighth embodiment described above, and are converted by the free-transformation circuit 83.
- the conversion process is exactly the same as the process in the Fourier transform circuit 13 described in the eighth embodiment.
- the differential demodulation circuits 86a and 86b individually perform the differential demodulation processing, and the two sets of differential demodulated data perform the Viterbi decoding processing in the video decoder 87. Viterbi decoding can be performed satisfactorily based on the data.
- the data to be selected by the four selectors is generated by the individual output order data generating means, so that the respective selectors individually and at appropriate timing. Selection processing can be performed, and good processing can be performed.
- a counter is used as output order data generation means.
- a shift register is used. May be used.
- FIG. 22 is a diagram showing the configuration of the demodulation section of this example.
- the input terminal 91 is supplied with a 0 FDM modulated signal which has been received and becomes an intermediate frequency signal (or baseband signal).
- the 0 FDM modulated signal obtained in 1 is supplied to a serial / parallel converter 92 and converted into parallel data of a predetermined bit.
- the parallel data output from the serial / parallel converter 92 is supplied to a Fourier transform circuit 93, which performs an orthogonal transform process for converting a frequency axis to a time axis and demodulating it by an arithmetic process using a fast Fourier transform.
- a Fourier transform circuit 93 which performs an orthogonal transform process for converting a frequency axis to a time axis and demodulating it by an arithmetic process using a fast Fourier transform.
- N points of M-bit data and use the Fourier transform circuit 9
- the N output registers (not shown) provided in the output unit 3 are set with M-bit data one point at a time.
- the N-point data output from the Fourier transform circuit 93 is simultaneously supplied to the first, second, third and fourth selectors 94a, 94b, 94c and 94d, respectively. I do.
- an adder 97 adds a predetermined value (constant value) to data designating a point output by the counter 95 serving as output order data generating means.
- the processed data is supplied, a process of sequentially selecting points to be output based on the data is performed, and the data of the selected points is transferred to one of the first differential demodulation circuits 98a. Supply to the input section of.
- the second selector 94 b data obtained by performing an arithmetic process of adding a predetermined value (constant value) by an adder 97 to data designating a point output by the counter 95, Further, the data delayed by a predetermined phase by the delay circuit 96b is supplied as data for designating a point to be output, and the data for the point selected by the data is converted to the second data. 1 is supplied to the other input of the differential demodulation circuit 98a.
- the third selector 94c data specifying the point output by the counter 95 is directly supplied as data specifying the output point, and the data point selected by the data is supplied to the third selector 94c. The input data is supplied to one input of a second differential demodulation circuit 98b.
- the data specifying the point output by the counter 95 is delayed by a predetermined phase by the delay circuit 96a, and the data specifying the output point is output. And supplies the data of the point selected by the data to the other input of the second differential demodulation circuit 98b.
- the counter 95 is a circuit for generating data designating N points in a predetermined order by a count process, and here, in the order corresponding to the interleave pattern applied to the received OFDM modulated signal. ,
- the configuration is such that data for designating each point in order is generated.
- the output pulse is supplied from the Fourier transform circuit 73 or the like, and the data is generated.
- the first and second differential demodulation circuits 98a and 98b perform differential demodulation processing using two sets of data supplied with a predetermined phase shift, respectively. Demodulated data is obtained, and the demodulated data of each of the demodulation circuits 98a and 98b is supplied to one input terminal of the Viterbi decoder 99 and the other input portion.
- the Viterbi decoder 990 performs Viterbi decoding processing using the supplied two systems of demodulated data, obtains Viterbi-decoded data, and supplies the decoded data from an output terminal 100 to a subsequent circuit. I do.
- the other parts are configured in the same manner as the configurations described in the above embodiments, and the conversion processing in the Fourier transform circuit 93 is also performed in the Fourier transform circuit 1 described in the eighth embodiment. This is exactly the same as the processing in 3.
- four sets of data with phase shifts are obtained as the orthogonally transformed data, and two sets of data are obtained based on the four sets of received data.
- the differential demodulation circuits 98a and 98b individually perform differential demodulation processing, and the Viterbi decoder 99 performs Viterbi decoding processing on the two sets of differential demodulated data.
- -Viterbi decoding can be performed well based on the evening.
- only one counter is provided as output order data generation means, and the output data of the one counter is delayed and added, and four counters are used. Since the configuration is such that the selection is performed at an appropriate timing, the configuration of the output order data generating means can be simplified, and the circuit configuration can be simplified.
- a counter is used as the output order data generating means. Shift registers can be used as described in
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- Signal Processing (AREA)
- Error Detection And Correction (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN99800505.3A CN1263659B (zh) | 1998-02-13 | 1999-02-12 | 调制方法、调制装置、解调方法和解调装置 |
US09/402,758 US6826239B1 (en) | 1998-02-13 | 1999-02-12 | Modulating method, modulator, demodulating method and demodulator |
EP99902898A EP0981217B1 (en) | 1998-02-13 | 1999-02-12 | Modulating method, modulating device, demodulating method, and demodulating device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP10/31620 | 1998-02-13 | ||
JP3162098 | 1998-02-13 | ||
JP10/99631 | 1998-04-10 | ||
JP10099631A JPH11298436A (ja) | 1998-02-13 | 1998-04-10 | 変調方法、変調装置、復調方法及び復調装置 |
Publications (1)
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WO1999041865A1 true WO1999041865A1 (fr) | 1999-08-19 |
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ID=26370119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/000624 WO1999041865A1 (fr) | 1998-02-13 | 1999-02-12 | Procede de modulation, dispositif de modulation, procede de demodulation et dispositif de demodulation |
Country Status (5)
Country | Link |
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US (1) | US6826239B1 (ja) |
EP (1) | EP0981217B1 (ja) |
JP (1) | JPH11298436A (ja) |
CN (1) | CN1263659B (ja) |
WO (1) | WO1999041865A1 (ja) |
Families Citing this family (4)
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US7158474B1 (en) * | 2001-02-21 | 2007-01-02 | At&T Corp. | Interference suppressing OFDM system for wireless communications |
US20040268207A1 (en) * | 2003-05-21 | 2004-12-30 | Engim, Inc. | Systems and methods for implementing a rate converting, low-latency, low-power block interleaver |
JP3877215B2 (ja) * | 2003-10-10 | 2007-02-07 | 株式会社インテリジェント・コスモス研究機構 | 送信装置、通信システムおよび通信方法 |
JP4995987B2 (ja) | 2009-07-31 | 2012-08-08 | 株式会社東芝 | 信号受信装置および通信システム |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5815353A (ja) * | 1981-07-21 | 1983-01-28 | Toshiba Corp | デ−タ復調回路 |
JPH07254915A (ja) * | 1994-03-15 | 1995-10-03 | Toshiba Corp | 階層的直交周波数多重伝送方式および送受信装置 |
JPH08501195A (ja) * | 1992-09-07 | 1996-02-06 | ブリティッシュ・ブロードキャスティング・コーポレーション | 周波数分割多重化を用いたディジタル信号伝送システム |
JPH0897731A (ja) * | 1994-09-21 | 1996-04-12 | Sony Corp | インターリーブ方式およびインターリーブ回路 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4615040A (en) * | 1984-06-14 | 1986-09-30 | Coenco Ltd. | High speed data communications system |
KR100247373B1 (ko) * | 1994-08-31 | 2000-03-15 | 이데이 노부유끼 | 신호 송신 장치, 신호 수신 장치, 및 신호 송수신방법 |
EP0719001A1 (en) * | 1994-12-22 | 1996-06-26 | ALCATEL BELL Naamloze Vennootschap | DMT modulator |
US5949796A (en) * | 1996-06-19 | 1999-09-07 | Kumar; Derek D. | In-band on-channel digital broadcasting method and system |
DE69837299T2 (de) * | 1997-01-22 | 2007-06-28 | Matsushita Electric Industrial Co., Ltd., Kadoma | System und Verfahren zur schnellen Fourier-Transformation |
JPH11298437A (ja) * | 1998-04-10 | 1999-10-29 | Sony Corp | 復調方法及び復調装置 |
-
1998
- 1998-04-10 JP JP10099631A patent/JPH11298436A/ja active Pending
-
1999
- 1999-02-12 EP EP99902898A patent/EP0981217B1/en not_active Expired - Lifetime
- 1999-02-12 CN CN99800505.3A patent/CN1263659B/zh not_active Expired - Fee Related
- 1999-02-12 US US09/402,758 patent/US6826239B1/en not_active Expired - Fee Related
- 1999-02-12 WO PCT/JP1999/000624 patent/WO1999041865A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5815353A (ja) * | 1981-07-21 | 1983-01-28 | Toshiba Corp | デ−タ復調回路 |
JPH08501195A (ja) * | 1992-09-07 | 1996-02-06 | ブリティッシュ・ブロードキャスティング・コーポレーション | 周波数分割多重化を用いたディジタル信号伝送システム |
JPH07254915A (ja) * | 1994-03-15 | 1995-10-03 | Toshiba Corp | 階層的直交周波数多重伝送方式および送受信装置 |
JPH0897731A (ja) * | 1994-09-21 | 1996-04-12 | Sony Corp | インターリーブ方式およびインターリーブ回路 |
Also Published As
Publication number | Publication date |
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US6826239B1 (en) | 2004-11-30 |
EP0981217B1 (en) | 2012-09-12 |
JPH11298436A (ja) | 1999-10-29 |
CN1263659B (zh) | 2010-09-29 |
EP0981217A4 (en) | 2005-11-23 |
EP0981217A1 (en) | 2000-02-23 |
CN1263659A (zh) | 2000-08-16 |
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