KR102359850B1 - Transmission device, reception device, and semiconductor chip - Google Patents

Abstract

It improves BER characteristics in MIMO system. The transmitting apparatus 1 maps the data distributed for each transmit antenna to the IQ plane to generate a carrier symbol, decomposes a plurality of carrier symbols into I data and Q data, and then according to a predetermined rule, one of the I data and the Q data. Interleaved data between the aligned polarized waves is interleaved in the time direction to generate an OFDM signal. The reception device 2 MIMO-separates time deinterleaved data obtained by deinterleaving the complex baseband signal of the OFDM signal in the time direction, and divides the MIMO-separated data into odd-numbered data and even-numbered data according to a predetermined rule. After aligning one of the data of , a carrier symbol is generated using adjacent data as I data and Q data.

Description

Transmitting device, receiving device, and semiconductor chip

Cross-referencing of related applications

This application claims priority to Japanese Patent Application No. 2015-24655, filed on February 10, 2015 and Japanese Patent Application No. 2015-129971, filed on June 29, 2015, the entire disclosure of the previous application is incorporated herein by reference.

The present invention relates to a transmitting apparatus and a receiving apparatus for performing MIMO (Multiple Input Multiple Output) transmission using a plurality of different antennas, in particular, a transmitting apparatus for interleaving between a plurality of antennas in a MIMO system. , a reception device that deinterleaves between a plurality of antennas, and a semiconductor chip on which they are mounted.

Recently, a multiple input multiple output (MIMO) system using a plurality of transmit/receive antennas has been proposed as a method for expanding data transmission capacity by wireless. In a transmission system using MIMO, space division multiplexing (SDM) or space time codes (STC) is performed. As an embodiment of the MIMO system, a polarization MIMO scheme using both horizontal polarization and vertical polarization at the same time has been proposed.

In MIMO transmission using a plurality of transmit/receive antennas, in an actual propagation path assuming a broadcast service, the reception level of only one receiving antenna may drop significantly due to a difference in reflection characteristics or the like. In SDM transmission, since different streams are transmitted by a plurality of antennas, the BER characteristic of the entire system is also greatly increased due to deterioration of the bit error rate (BER) characteristic due to a decrease in the reception level of one side. deteriorate

In the ISDB-T (Integrated Services Digital Broadcasting - Terrestrial) system, which is a Japanese terrestrial digital broadcasting system, in order to increase the efficiency of error correction, bit interleaving, time interleaving, and frequency interleaving, which align the order of transmission data, are employed. (For example, refer to nonpatent literature 1). Also, a technique of extending IEEE 802.11 interleaving to a MIMO system, distributing one stream to a plurality of transmitters in units of bits, and performing bit interleaving in units of each transmitter is known (see, for example, Patent Document 1) .

Patent Document 1: Japanese Patent Application Laid-Open No. 2008-505558

Non-Patent Document 1: 「Terrestrial Digital Television Transmission Method」, ARIB STD-B31, Radio Industry Association

In SDM-MIMO transmission in which different streams are transmitted using multiple antennas (eg, two), the reception level of antenna 1 is R ₁ , the reception level of antenna 2 is R ₂ , and the bit error rate of antenna 1 is BER ₁ , if the bit error rate of antenna 2 is BER ₂ , the reception level R of the entire MIMO transmission system using both antennas and the bit error rate BER can be expressed as the following equations (1) and (2) by taking the average of each have.

R = (R ₁ +R ₂ ) / 2 (1)

BER = (BER ₁ + BER ₂ ) / 2 (2)

In SDM-MIMO transmission actually performed outdoors, a large level difference occurs between antennas depending on the location due to differences in propagation path characteristics of radio waves emitted from each antenna and the like. When the reception level drops only due to the propagation path and the bit error rate deteriorates, the bit error rate of the entire system also deteriorates according to the above equation. In Fig. 15, the BER characteristic of each antenna is indicated by a solid line, and the BER characteristic after synthesis is indicated by a broken line. Accordingly, it can be seen that the BER characteristic after synthesis deteriorates. Therefore, in SDM-MIMO transmission using a plurality of antennas, there are problems that stable reception cannot be performed and the receivable area becomes narrow due to deterioration of the BER characteristic due to the level difference between the antennas.

It is an object of the present invention to provide a transmitting device, a receiving device, and a semiconductor chip capable of improving BER characteristics in a MIMO system that performs SDM-MIMO transmission in order to solve the above problem.

In order to solve the above problems, a transmitting apparatus according to the present invention is a transmitting apparatus that generates an OFDM signal transmitted by a plurality of transmit antennas, comprising: a data distribution unit for distributing data to each of the transmit antennas; A mapping unit that maps the data distributed by the to the IQ plane and generates a carrier symbol to which carrier modulation is applied, respectively, and a plurality of the carrier symbols are arranged on the I data and the Q-axis coordinates disposed on the I-axis coordinates of the IQ plane an interpolarization interleaving unit generating interpolarized interleaved data in which one of I data and Q data is aligned according to a predetermined rule among the plurality of transmit antennas after decomposition into Q data; and a time interleaving unit generating time interleaved data obtained by interleaving the interleaved data between polarized waves in a time direction, respectively, and an OFDM output processing unit generating an OFDM signal with respect to the time interleaved data.

In order to solve the above problem, a receiving device according to the present invention demodulates an OFDM signal received by a plurality of receiving antennas, and demodulates the OFDM signal, An OFDM input processing unit generating a band signal; a time deinterleaving unit generating time deinterleaving data obtained by deinterleaving the complex baseband signal in a time direction for each reception antenna; and MIMO separation of the time deinterleaved data A MIMO detection unit and one of odd-numbered data and even-numbered data are aligned between the plurality of reception antennas according to a predetermined rule among the plurality of reception antennas for a plurality of MIMO-separated data by the MIMO detection unit, and then adjacent data are subjected to IQ It is characterized by comprising a deinterleaving unit between data polarizations that generate a carrier symbol as I data disposed on the I-axis coordinate of the plane and Q data disposed on the Q-axis coordinate.

Further, in order to solve the above problem, a semiconductor chip according to the present invention is a semiconductor chip that generates an OFDM signal transmitted by a plurality of transmit antennas, and comprises: a data distribution unit for distributing data to each of the transmit antennas; A mapping unit that maps the data distributed by the distribution unit to the IQ plane and generates carrier symbols to which carrier modulation is applied, respectively, and a plurality of the carrier symbols on I data and Q coordinates arranged on the I-axis coordinates of the IQ plane an interpolarization interleaving unit generating interpolarized interleaved data in which one of I data and Q data is aligned according to a predetermined rule among the plurality of transmitting antennas after decomposition into arranged Q data; and a time interleaving unit generating time interleaved data obtained by interleaving interleaved data between polarized waves in a time direction, respectively, and an OFDM output processing unit generating an OFDM signal with respect to the time interleaved data.

Further, in order to solve the above problem, a semiconductor chip according to the present invention is a semiconductor chip that demodulates an OFDM signal received by a plurality of reception antennas, and demodulates the OFDM signal to generate a complex baseband signal. an input processing unit; a time deinterleaving unit generating time deinterleaving data obtained by deinterleaving the complex baseband signal in the time direction for each of the reception antennas; and a MIMO detecting unit MIMO separating the time deinterleaving data; For a plurality of MIMO-separated data by the detection unit, one of odd-numbered data and even-numbered data is aligned according to a predetermined rule among the plurality of receiving antennas, and then adjacent data is placed on the I-axis coordinate of the IQ plane. It is characterized in that it comprises a deinterleaving unit between the data polarization for generating a carrier symbol as the I data and Q data arranged on the Q-axis coordinates.

According to the present invention, BER characteristics can be improved by interleaving between polarized waves in a MIMO system for performing SDM-MIMO transmission. In this way, it is possible to expand the receivable area and achieve stable reception.

1 is a block diagram showing the configuration of a transmission apparatus according to a first embodiment of the present invention.
Fig. 2 is a block diagram showing the configuration of a receiving apparatus according to the first embodiment of the present invention.
Fig. 3 is a diagram for explaining the processing of the noise dispersion calculation unit in the reception apparatus according to the first embodiment of the present invention.
Fig. 4 is a diagram for explaining a first processing example of an interleaving unit between polarized waves in the transmitting apparatus according to the first embodiment of the present invention.
Fig. 5 is a diagram for explaining a second processing example of an interleaving unit between polarizations in the transmitting apparatus according to the first embodiment of the present invention.
6 is a block diagram showing a configuration example of a frequency interleaving unit in the transmitting apparatus according to the first embodiment of the present invention.
7 is a view for explaining a first processing example of the intersegment interleaving unit of the frequency interleaving unit in the transmitting apparatus according to the first embodiment of the present invention.
Fig. 8 is a diagram for explaining the processing of the data rotation unit of the frequency interleave unit in the transmitting apparatus according to the first embodiment of the present invention.
Fig. 9 is a diagram for explaining the processing of the data randomizing unit of the frequency interleaving unit in the transmitting apparatus according to the first embodiment of the present invention.
10 is a diagram for explaining a second processing example of an intersegment interleaving unit of a frequency interleaving unit in the transmitting apparatus according to the first embodiment of the present invention.
11 is a block diagram showing the configuration of a transmission apparatus according to a second embodiment of the present invention.
12 is a block diagram showing the configuration of a receiving apparatus according to a second embodiment of the present invention.
Fig. 13 is a diagram for explaining a first processing example of an interleaving unit between polarizations in the transmitting apparatus according to the second embodiment of the present invention.
Fig. 14 is a diagram for explaining a second processing example of an interleaving unit between polarizations in the transmitting apparatus according to the second embodiment of the present invention.
15 is a diagram showing deterioration of bit error rate characteristics due to a difference in reception level.

In general, the error correction code is difficult to correct when data is continuously wrong. Therefore, by interleaving the data in the transmitting apparatus and deinterleaving the received data in the receiving apparatus to return the original data, the error data is dispersed as a whole to improve the error correction capability. ISDB-T, a Japanese digital broadcasting system, is designed to realize optimal performance under various conditions by performing bit interleaving processing, frequency interleaving processing, and time interleaving processing respectively. In the present invention, in addition to such interleaving, by performing interleaving processing between the transmitting antennas, error data due to a level difference between the transmitting antennas is distributed among the transmitting antennas, thereby improving the transmission characteristics of the entire MIMO system. Hereinafter, as an example of MIMO using multiple antennas, polarized MIMO using orthogonality between polarized waves will be described as a specific example. However, the present invention is effective not only for polarized MIMO transmission but also for general SDM-MIMO transmission.

<First embodiment>

In the first embodiment, 2×2 MIMO is described as an example in which the number of transmit antennas is 2 and the number of receive antennas is 2, but the number of antennas is not limited thereto.

[transmitter device]

First, a transmission apparatus according to a first embodiment of the present invention will be described. A transmission apparatus transmits an OFDM signal from a plurality of transmission antennas using different polarizations, respectively. 1 is a block diagram showing the configuration of a transmission apparatus according to a first embodiment of the present invention. As shown in Fig. 1, the transmitting apparatus 1 includes an error correction encoding unit 11, a bit interleaving unit 12, a data distribution unit (antenna stream demultiplexer) 13, and two mapping units ( 14) (14-1 and 14-2), a polarization interleaving unit (MIMO Precoder) 15, and two time interleaving units 16 (16-1 and 16-2), 2 frequency interleaving units 17 (17-1 and 17-2) and two OFDM output processing units 18 (18-1 and 18-2), and the transmitting device 1 includes two transmitting antennas ( 19) (19-1 and 19-2) are connected. The transmitting device 1 may be configured by one or a plurality of semiconductor chips.

The error correction encoding unit 11 performs error correction encoding on an input transmission signal so as to enable the reception side to correct a transmission error, and outputs the error correction encoding unit 12 to the bit interleaving unit 12 . For error correction, for example, the BCH code is used as the outer code and the LDPC (Low Density Parity Check) code is used as the inner code.

The bit interleaving unit 12 interleaves the transmission signal output from the error correction encoding unit 11 bit by bit in order to improve the performance of the error correction code, and outputs it to the data distribution unit 13 . When the LDPC code is used as an external code for error correction, the bit interleaving method is known to be effective in the method used in DVB-C2 or the like. For the bit interleaving method of DVB-C2, refer to ETSI EN 302 769 V1.2.1(p.32) or http://www.dvb.org/technology/dvbc2/.

The data distribution unit 13 distributes the data input from the bit interleaving unit 12 to the mapping unit 14-1 and the mapping unit 14-2 in a predetermined number. Accordingly, the transmission signal is divided into the number of antenna minutes. For example, a bit corresponding to the odd-numbered carrier symbol distributed by data for one carrier symbol is output to the mapping unit 14-1 for the transmit antenna 19-1, and the even-numbered carrier symbol is output. A bit corresponding to ? is output to the mapping unit 14-2 for the transmit antenna 19-2.

The mapping unit 14 maps the data input from the data distribution unit 13 as m bits/carrier symbols to the IQ plane, and generates carrier symbols to which carrier modulation according to the modulation method is applied, between polarized waves output to the interleaving unit 15 .

The inter-polarization interleaving unit 15 arranges the order of carrier symbols input from the mapping units 14-1 and 14-2 between polarizations (between transmission antennas), and interleaved data for each transmission antenna 19. generated, and output to the time interleaving units 16-1 and 16-2. A specific example of the interleaving process between polarizations will be described later.

The time interleaving unit 16 generates interleaved data by arranging the order of carrier symbols input from the interpolarization interleaving unit 15 in the time direction, and outputs the interleaved data to the frequency interleaving unit 17 .

The frequency interleaving unit 17 generates interleaved data by arranging the order of carrier symbols input from the time interleaving unit 16 in the frequency direction, and outputs the data to the OFDM output processing unit 18 . For example, the interleaving process is performed by the method implemented in ISDB-T, and interleaving is performed in the frequency direction for every 1 OFDM symbol. A specific example of the frequency interleaving process will be described later.

The OFDM output processing unit 18 constructs an OFDM frame with respect to the interleaved data input from each frequency interleaving unit 17 , and transmits the OFDM signal through the transmission antenna 19 . The OFDM output processing unit 18-1 processes the transmission data for the first polarization wave, and the OFDM output processing unit 18-2 processes the transmission data for the second polarization wave. The first polarization and the second polarization are polarized waves separable into two types, such as horizontal polarization and vertical polarization, right-circle polarization, and left-circle polarization. Each OFDM output processing unit 18 includes an OFDM frame construction unit 181 , an IFFT unit 182 , and a GI adding unit 183 .

The OFDM frame construction unit 181 inserts a pilot signal (SP signal, CP signal), a TMCC signal indicating control information, and an AC signal indicating additional information into the signal input from each frequency interleaving unit 17, An OFDM frame is constituted by blocks of a predetermined number of OFDM symbols using (all) carriers as one OFDM symbol.

The IFFT unit 182 applies an Inverse Fast Fourier Transform (IFFT) process to OFDM symbols input from each OFDM frame construction unit 181 to generate effective symbol signals in the time domain.

The GI adding unit 183 inserts a guide interval in which the second half of the effective symbol signal is copied at the beginning of the effective symbol signal inputted from each IFFT unit 182, and OFDM is subjected to orthogonal modulation processing and D/A conversion. The signal is transmitted to the outside through the transmission antenna 19 .

The transmitting antenna 19 is an antenna for horizontal polarization and an antenna for vertical polarization, or an antenna for right-circle polarization and an antenna for left-circle polarization.

[receiving device]

Next, a reception apparatus according to a first embodiment of the present invention will be described. The receiving device receives and demodulates the OFDM signal transmitted by the above-described transmitting device 1 with a plurality of receiving antennas. Fig. 2 is a block diagram showing the configuration of the receiving apparatus according to the first embodiment of the present invention. As shown in Fig. 2, the reception device 2 includes two OFDM input processing units 22 (22-1 and 22-2), a transmission path response calculating unit 23, and two frequency deinterleaving units. (24) (24-1 and 24-2), two time deinterleave units 25 (25-1 and 25-2), a MIMO detection unit 26, and a data polarization deinterleave unit 27 and a noise dispersion calculating unit 28, a deinterleaving unit 29 between polarized noise dispersion values, and two LLR (Log Likelihood Ratio: Log Likelihood Ratio) calculating units 30 (30-) 1 and 30-2), a data integration unit 31, a bit deinterleave unit 32, and an error correction code decoding unit 33, and the receiving device 2 includes two receiving antennas 21 (21-1 and 21-2) are connected. In addition, the receiving device 2 may be comprised by one or a plurality of semiconductor chips.

The reception antenna 21 is an antenna for horizontal polarization and an antenna for vertical polarization, or an antenna for right-circle polarization and an antenna for left-circle polarization.

The OFDM input processing unit 22 receives the OFDM signal transmitted from the transmission device 1 through the reception antenna 21 and demodulates it. Each OFDM input processing unit 22 includes a GI removal unit 221 , an FFT unit 222 , and a pilot signal extraction unit 223 .

The GI removal unit 221 performs orthogonal demodulation processing on the received OFDM signal to generate a baseband signal, and generates a digital signal by A/D conversion. Then, the GI removal unit 221 removes the guide interval, extracts an effective symbol signal, and outputs it to the FFT unit 222 .

The FFT unit 222 applies FFT (Fast Fourier Transform: Fast Fourier Transform) processing to the effective symbol signal input from the GI removal unit 221 to generate a complex baseband signal, and a pilot signal extraction unit 223 . and the frequency deinterleave unit 24 .

The pilot signal extraction unit 223 extracts a pilot signal (SP signal, CP signal) from the complex baseband signal input from the FFT unit 222 , and outputs it to the transmission path response calculation unit 23 .

The transmission path response calculation unit 23 calculates a transmission path response using the pilot signal input from the pilot signal extraction unit 223 , and outputs it to the MIMO detection unit 26 .

The frequency deinterleave unit 24 deinterleaves the complex baseband signal input from the OFDM input processing unit 22 in the frequency direction. The frequency direction deinterleave processing is processing for returning data aligned in the frequency direction by the frequency interleaving unit 17 of the transmitter 1 to the original order.

The time deinterleave unit 25 deinterleaves data input from the frequency deinterleave unit 24 in the time direction. The time-direction deinterleave process is a process of returning data sorted in the time direction by the time interleaving unit 16 of the transmitter 1 to the original order.

The MIMO detection unit 26 uses the baseband signal input from the time deinterleave unit 25 and the transmission path response input from the transmission path response calculating unit 23 to perform Zero Forcing (ZF) and Minimum Mean (MMSE) signals. Squared Error), BLAST (Bell Laboratories Layered Space-Time), and MLD (Maximum Likelihood Detection), waveform equalization and MIMO separation of the two polarized signals transmitted from the transmitter 1 by conventional methods such as , and output to the data polarization interleaving unit 27 and the noise dispersion calculating unit 28 .

The inter-data polarization deinterleave unit 27 deinterleaves data input from the MIMO detection unit 26 between polarizations (between receiving antennas), and outputs it to the LLR calculation unit 30 . The deinterleaving process between polarized waves is a process of returning the data arranged among polarized waves by the interpolarization interleaving unit 15 of the transmitter 1 to the original order.

The noise variance calculation unit 28 calculates an average noise variance from each polarization signal input from the MIMO detection unit 26 , and outputs it to the noise variance value interpolarization deinterleave unit 29 . The noise variance (σ ² ) means the deviation between the symbol point on the IQ coordinate where the carrier symbol should be originally and the symbol point P of the actually observed carrier symbol, for example, the modulation error ratio It can be obtained by taking the reciprocal

3 is a diagram for explaining the processing of the noise dispersion calculation unit 28. As shown in FIG. There are several methods of calculating the noise variance. As shown in Fig. 3, when calculating the noise variance of the symbol point P, data symbols subjected to multivalue modulation (64QAM in the example of Fig. 3) are used. If it is obtained from an AC symbol and/or a TMCC symbol, the probability of being incorrectly recognized is lower than that obtained from . Therefore, it is preferable that the noise variance calculation unit 28 calculates the average noise variance of the entire OFDM carrier symbol by using the AC symbol and/or the TMCC symbol.

When there are multiple paths in the transmission path, a difference in noise distribution occurs because the power is different in each OFDM carrier. The noise variance (σ ² ) is required in order to obtain the log-likelihood ratio (LLR) in bits constituting each carrier symbol, and calculating the noise variance for each carrier as accurately as possible determines the performance of LDPC decoding. Therefore, using the weight matrix obtained from the transmission path response, weight is given to each carrier with respect to the average noise variance of the entire band to determine the noise variance. It is known that the weight matrix in each carrier can be expressed as (H ^H H) ^-1 as the transmission path response matrix H. The weight component of each carrier can be represented by this diagonal component. It is normalized to all carriers and weighted by multiplying the average noise variance of the entire band. Regarding the decoding method of multiplying the information (= C/N) of the signal power of each carrier by the likelihood calculation, for example, Nakahara, "64QAM-OFDM signal in multipath transmission path" Review of Soft Decision Decoding Method of ', ITE Technical Report vol.22, no.34, PP1-6, Jun.1998. For details of calculation of the weight matrix, etc., refer to, for example, Ogane-Ogawa, "Comprehensive MIMO System Description", Omsa, p.101.

The noise dispersion value interpolarization deinterleaving unit 29 deinterleaves the noise variance corresponding to each polarized signal input from the noise dispersion calculation unit 28 (interpolarization interleaving unit 15 of the transmitter 1). ) and inverse alignment processing) are performed, and output to the LLR calculation unit 30 . By similarly deinterleaving the noise dispersion values necessary for calculating the LLR, it is possible to reflect the different noise dispersion values resulting from the difference in the transmission paths between the plurality of antennas in the LLR. As a result, it is possible to calculate the LLR more accurately by the LLR calculation unit 30 , and to exhibit an improvement effect in the error correction code decoding unit 33 .

The LLR calculation unit 30 includes the deinterleaved data input from the inter-polarized data deinterleave unit 27 and the noise variance (σ) input from the deinterleaved unit 29 between the polarized noise variance value corresponding to the data. ² ) is used to calculate the LLR and output to the data integration unit 31 . For example, in LLR in BPSK modulation, since the observed value is y, the probability P (= likelihood function) of each binary (x=0, 1) becomes a Gaussian distribution, so the following It is represented by Formula (3). For details, refer to, for example, Wadayama, "Low-density parity check code and its decoding method", Triceps.

The data integration unit 31 integrates the LLRs corresponding to each bit calculated by each LLR calculation unit 30 (30-1 and 30-2) (data distribution unit 13 of the transmission device 1) and vice versa), and output to the bit deinterleaving unit 32 .

The bit deinterleave unit 32 deinterleaves the LLR corresponding to each bit input from the data integration unit 31 . This deinterleaving process is a process of returning the data sorted by the bit interleaving unit 12 of the transmitter 1 to the original order.

The error correction code decoding unit 33 performs LDPC decoding using the LLR input from the bit deinterleave unit 32, and further performs BCH decoding to decode the signal transmitted from the transmission device 1 .

In addition, the transmitting apparatus 1 reverses the processing order of the time interleaving unit 16 and the frequency interleaving unit 17, and after performing the processing of the frequency interleaving unit 17, the processing of the time interleaving unit 16 is performed. It is also free to allow In that case, the receiving device 2 similarly reverses the processing order of the frequency deinterleave unit 24 and the time deinterleave unit 25 to perform the processing by the time deinterleave unit 25, and then The processing of the interleaving unit 24 is performed.

In addition, you may make it perform the interleaving process between polarizations and the frequency interleave process simultaneously, and the transmitter 1 may make it implement the time interleaving process after that. In that case, the receiving device 2 similarly performs the time deinterleave process, and then simultaneously performs the interpolarized wave deinterleave process and the frequency deinterleave process.

[Interleaved part between polarizations]

Next, the detail of the process of the interleaving part 15 between polarizations is demonstrated. In addition, the sort order of data by the interleaving process is not limited to the following example.

[First example of interleaving between polarizations]

4 is a view for explaining an example of the first interleaving process of the interleaving unit 15 between polarized waves. In the first example, every OFDM carrier symbol equal to the number of transmit antennas is arranged in carrier symbol units according to a predetermined rule. When the number of carrier symbols of OFDM carrier symbols is N, the interpolarization interleaving unit 15 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and the mapping unit 14-2 ), input carrier symbols of carrier symbol numbers N to 2N-1. In the first example, the interleaving unit 15 between polarizations 15 writes the carrier symbols one row (p pieces) in the row direction, and then reads them out one column (q pieces) in the column direction at a time. out, read). p×q = 2N.

Similarly, the interpolarization interleaving unit 15 prepares in advance a table (rule table) in which the positions of the carrier symbols before alignment and the positions of the carrier symbols after alignment for OFDM carrier symbols corresponding to the number of transmission antennas are associated according to a predetermined rule. free to take In this case, the interpolarization interleaving unit 15 inputs carrier symbols of carrier symbol numbers 0 to N-1 in the mapping unit 14-1, and carrier symbol numbers N to 2N- in the mapping unit 14-2. A carrier symbol of 1 is input, and a rule table is referred and arranged for every carrier symbol of 2N in total.

[Second example of interleaving between polarizations]

Next, a second example of interleaving processing between polarized waves will be described. FIG. 5 is a diagram for explaining an example of the second interleaving process performed by the interleaving unit 15 between polarized waves. In the first example, every OFDM carrier symbol for the number of transmit antennas and according to a predetermined rule, in the second example, every OFDM carrier symbol for the number of transmit antennas, according to a predetermined rule, the IQ plane Data arranged on the I-axis coordinates of (hereinafter referred to as 'I data') and data arranged on the Q-axis coordinates of the IQ plane (hereinafter referred to as 'Q data') are different in aligning units.

That is, in the second example, when the number of carrier symbols is N, the interleaving unit 15 between polarizations inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, I data and It is decomposed into Q data and used as I data or Q data (hereinafter referred to as "IQ data") of data numbers 0 to 2N-1. Similarly, the mapping unit 14-2 inputs carrier symbols of carrier symbol numbers N to 2N-1, and decomposes them into I data and Q data to obtain IQ data of data numbers 2N to 4N-1. Then, after writing IQ data one row (p pieces) in the row direction, one column (2q pieces) is read out in the column direction. After interleaving, a new carrier symbol (a pair of I and Q data) is constructed. p×2q = 4N.

Similarly, the interpolarization interleaving unit 15 prepares a table (rule table) in which the positions of the IQ data before alignment and the positions of the IQ data after alignment for OFDM carrier symbols corresponding to the number of transmission antennas are associated according to a predetermined rule in advance. free to take In this case, the interleaving unit 15 between polarizations inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, decomposes them into I data and Q data, and data numbers 0 to 2N-1 of IQ data. Similarly, the mapping unit 14-2 inputs carrier symbols of carrier symbol numbers N to 2N-1, and decomposes them into I data and Q data to obtain IQ data of data numbers 2N to 4N-1. Then, for each IQ data of 4N in total, it is sorted with reference to the rule table.

[Third example of interleaving between polarizations]

Next, a third example of interleaving processing between polarized waves will be described. In the third example, the inter-polarization interleaving unit 15 prepares in advance a table (irregular table) in which the positions of the carrier symbols before alignment and the positions of the carrier symbols after alignment are associated with OFDM carrier symbols corresponding to the number of transmission antennas in advance. have The interpolarization interleaving unit 15 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and carriers of carrier symbol numbers N to 2N-1 from the mapping unit 14-2. A symbol is input, and an irregularity table is referred and arranged for every 2N carrier symbol in total.

[Fourth example of interleaving between polarizations]

Next, a fourth example of interleaving processing between polarized waves will be described. In the third example, the irregular arrangement is different for every OFDM carrier symbol for a number of transmit antennas and in units of carrier symbols, whereas in the fourth example, for every OFDM carrier symbol for a number of transmit antennas, irregularly arranged in units of IQ data is different. .

That is, in the fourth example, the inter-polarization interleaving unit 15 randomly associates the positions of IQ data before alignment with positions of IQ data after alignment with respect to OFDM carrier symbols corresponding to the number of transmission antennas (irregular table) have in advance The polarization interleaving unit 15 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, decomposes them into I data and Q data, and then IQ data of data numbers 0 to 2N-1. do it with Similarly, the mapping unit 14-2 inputs carrier symbols of carrier symbol numbers N to 2N-1, and decomposes them into I data and Q data to obtain IQ data of data numbers 2N to 4N-1. Then, for each IQ data of 4N in total, an irregular table is referred to and sorted. After interleaving, a new carrier symbol (a pair of I and Q data) is constructed.

In addition, in the third and fourth examples of interleaving processing between polarizations, periodicity can be excluded by one processing and the BER characteristic is good, but it is necessary to have a table, and processing can be performed according to a predetermined rule Since there is no such thing, the load when it is implemented in hardware becomes large.

In addition, in the above-described example of interleaving between polarizations, the interleaving unit 15 between polarizations 15 arranges in a carrier symbol unit or an IQ data unit for every OFDM carrier symbol equal to the number of transmission antennas, but a carrier symbol for every arbitrary number of carrier symbols. It is okay to sort by unit or IQ data unit.

In addition, in the case of aligning the carrier symbols in units of IQ data in the second or fourth example described above, the interleaving unit 15 between polarizations may align only one of the I data and the Q data.

On the other hand, the inter-polarization deinterleaving unit 27 aligns the data separated by MIMO by the MIMO detecting unit 26 in the reverse direction to the interpolarization interleaving unit 15 and returns it to the original order. For example, when the interleaving unit 15 between polarizations performs the interleaving process of the first example described above, the deinterleaving unit 27 between data polarizations writes data one row (q pieces) in the row direction. After that, one column (p pieces) is read in each column direction. In addition, when the interleaving unit 15 between polarizations performs the interleaving process of the second example described above, the deinterleaving unit 27 between data polarizations writes data one row at a time (2q pieces) in the row direction, One column (p pieces) is read in each column direction. In addition, when the interleaving unit 15 between polarizations uses the above table (a rule table or an irregular table) to perform interleaving, the deinterleave unit 27 between data polarizations changes the positions before and after alignment of the table. Sort by referring to the inserted table.

In addition, the inter-polarization deinterleaving unit 27 is configured to provide odd-numbered data and even-numbered data when the interpolarization interleaving unit 15 aligns only one of the I data and Q data in the above-described second or fourth example. Only one of the first data is sorted.

The data polarization deinterleaving unit 27 is configured to perform MIMO separation by the MIMO detection unit 26 when the interpolarization interleaving unit 15 performs interpolarization interleaving processing according to the second or fourth example described above. For data, after deinterleaving between polarized waves, carrier symbols are generated by using adjacent data as I data disposed on the I-axis coordinate of the IQ plane and Q data disposed on the Q-axis coordinate.

The noise dispersion value interpolarization deinterleaving unit 29 aligns the noise variance input from the noise variance calculating unit 28 in the opposite direction to the interpolarization interleaving unit 15, similarly to the data polarization interleaving unit 27. .

[frequency interleaved part]

Next, the detail of the process of the frequency interleaving part 17 is demonstrated. In addition, since the frequency deinterleaving part 24 is arranged in the reverse direction to the frequency interleaving part 17 and returning to the original order, description is abbreviate|omitted. 6 is a block diagram showing a configuration example of the frequency interleaving unit 17. As shown in FIG. The frequency interleaving unit 17 includes an intersegment interleaving unit 171 , a data rotation unit 172 , and a data randomizing unit 173 . However, since the interleaved part 15 between polarizations also substantially serves as the process of the interleaved part 171 between segments, the interleaved part 171 between segments may be omitted.

[First example of frequency interleaving processing]

The processing of the frequency interleaving unit 17 in the case where the interpolarization interleaving processing of the interpolarization interleaving unit 15 is the above-described first or third example will be described as a first example of the frequency interleaving processing.

Fig. 7 is a diagram for explaining the processing of the interleaving unit 171 between segments. Fig. 7(a) shows the symbol arrangement before interleaving, and Fig. 7(b) shows the symbol arrangement after interleaving. The intersegment interleaving unit 171 interleaves the carrier symbols input from the time interleaving unit 16 in the frequency direction between segments for each OFDM carrier symbol. In the example shown in Fig. 7, the number of segments in one OFDM carrier symbol is n (in the ISDB-T system, n = 13), and the number of carrier symbols per segment is 384. In addition, the sort order is an example, and is not limited thereto.

Fig. 8 is a diagram for explaining the processing of the data rotation unit 172. Fig. 8(a) shows the symbol arrangement before interleaving, and Fig. 8(b) shows the symbol arrangement after interleaving. As in Fig. 7, the number of carrier symbols per segment is 384. The data rotation unit 172 interleaves the carrier symbols inputted from the intersegment interleave unit 171 for each segment by data rotation. The data rotation unit 172 aligns the k-th segment and the i-th data to the k-th segment and the i'-th data by data rotation. In the example shown in FIG. 8, it is set as i' = (i+k) mod 384. In addition, the sort order is an example, and is not limited thereto.

Fig. 9 is a diagram for explaining the processing of the data randomization unit 173. Fig. 9 (a) shows the symbol arrangement before interleaving, and Fig. 9 (b) shows the symbol arrangement after interleaving. 7 and 8, the number of carrier symbols per segment is set to 384. The data randomization unit 173 has an irregular table for the number of carrier symbols in a segment in advance (the same irregular table is used on the transmitting side and the receiving side), and for data input from the data rotation unit 172, an irregular table , and performs randomization processing within the segment, excluding periodicity. In addition, a random number (亂數) is an example, and is not limited to this. In addition, the intersegment interleaving unit 171 , the data rotation unit 172 , and the data randomizing unit 173 may be arranged differently in the frequency interleaving units 17-1 and 17-2.

[Second example of frequency interleaving processing]

Next, the processing of the frequency interleaving unit 17 in the case where the interpolarization interleaving processing of the interpolarization interleaving unit 15 is the above-described second or fourth example will be described as a second example of the frequency interleaving processing.

Fig. 10 is a diagram for explaining the processing of the interleaving unit 171 between segments, Fig. 10 (a) shows the arrangement of I data or Q data before interleaving, and Fig. 10 (b) shows the arrangement of IQ data after interleaving. indicates. The intersegment interleaving unit 171 interleaves the IQ data input from the time interleaving unit 16 in the frequency direction between segments for each OFDM carrier symbol. In the example shown in Fig. 10, the number of segments in one OFDM symbol is n (n = 13 in the ISDB-T system), and the number of carrier symbols per segment is 384 (that is, the number of IQ data is 768). The intersegment interleaving unit 171 aligns data in units of IQ data, not in units of carrier symbols. In addition, the alignment is an example, and is not limited thereto.

As in the first example, the data rotation unit 172 interleaves the IQ data input from the intersegment interleave unit 171 for each segment by rotating the data, and the data randomization unit 173 ) has an irregular table for the number of carrier symbols in the segment in advance at the transmitting side and the receiving side, and randomly aligns the carrier symbols input from the data rotation unit 172 in the segment with reference to the irregular table, and provides periodicity. exclude

In addition, in the third and fourth examples of interleaving between polarizations, periodicity in the frequency direction can also be excluded by the irregularity table of the interleaving unit 15 between polarizations, so the frequency interleaving unit 17 is omitted. It is also possible In that case, the receiving device 2 also omits the frequency deinterleaving unit 24 in the same manner.

In this way, the transmitting apparatus 1 aligns the order of carrier symbols among polarized waves by the interpolarization interleaving unit 15 and generates interleaved data for each transmit antenna 19 . In addition, the reception device 2 deinterleaves the data interleaved by the transmission device 1 between the polarized waves by the deinterleave unit 27 between data polarizations and the deinterleave unit 29 between the polarized noise dispersion values. do. For this reason, according to the transmitting device 1 and the receiving device 2 of the first embodiment, even when there is a difference in reception level between the polarized waves, the data on the polarized wave side containing a lot of error data can be dispersed. In addition, by improving the effect of the error correction code, it is possible to improve the BER characteristic.

In addition, the transmitter 1 does not divide the data among the plurality of antennas after the time interleave processing and the frequency interleave processing and perform interpolarization interleave processing, but transfer the data between the plurality of antennas before the time interleave processing and the frequency interleave processing. Interleaving between polarized waves is performed by dividing. On the other hand, the processing of the reception device 2 is equivalent to processing the processing of the transmission device 1 in the reverse direction, and after signal reception, OFDM demodulation processing, frequency deinterleaving processing, time deinterleaving processing, MIMO detection leads to processing. Here, when demodulation and decoding are repeatedly performed in the receiving device 2 such as turbo equalization processing, the decoding result is input to the MIMO detection unit 26 or the LLR calculation units 30-1 and 30-2, and repeated processing is performed. is sometimes carried out. At this time, if a time deinterleave unit exists in the iterative process, the time interleave process is required again when the decoding result is input, and the circuit scale increases. Therefore, in the present invention, the receiving device 2 arranges the time deinterleaving unit 25 before the MIMO detecting unit 26, and the transmitting device 1 has the time interleaving unit 16 after the interpolarized wave interleaving unit 15. ) is placed. Therefore, according to the present invention, it is possible to realize the receiving device 2 that repeatedly performs demodulation/decoding processing without increasing the circuit scale.

<Second embodiment>

Next, as the second embodiment, when one data stream is transmitted using a plurality of channels simultaneously (hereinafter referred to as bulk transmission), that is, the transmitting apparatus transmits OFDM signals of the plurality of channels to a plurality of transmission antennas for each channel. A case in which transmission is performed using , and a receiving apparatus receives OFDM signals of a plurality of channels using a plurality of reception antennas for each channel will be described. In the second embodiment, the case where the number of channels is two is described as an example, but the number of channels is not limited to two.

[transmitter device]

11 is a block diagram showing the configuration of the transmission device 3 according to the second embodiment. As shown in Fig. 11, the transmission device 3 includes an error correction encoding unit 11, a bit interleaving unit 12, a data distribution unit 13, and four mapping units 14 and 14- 1 to 14-4), the polarization/channel interleaving unit 20, four time interleaving units 16 (16-1 to 16-4), and four frequency interleaving units 17 and 17-1 to 17-4), a first channel output processing unit 180-1, and a second channel output processing unit 180-2, and the transmitting device 3 includes four transmitting antennas 19 and 19 -1 to 19-4) are connected. In addition, the transmitter 3 may be comprised by one or a plurality of semiconductor chips.

The error correction encoding unit 11 and the bit interleaving unit 12 perform processing similar to that of the first embodiment on the two-channel transmission signal.

The data distribution unit 13 divides the data input from the bit interleaving unit 12 into four streams by a predetermined number, and distributes the data to the mapping units 14-1 to 14-4. For example, a bit corresponding to an odd-numbered carrier symbol is distributed by data for one carrier symbol, that is, a bit corresponding to an odd-numbered carrier symbol is output to the mapping units 14-1 and 14-3, and a bit corresponding to an even-numbered carrier symbol is outputted. output to the mapping units 14-2 and 14-4.

The mapping unit 14 maps the data input from the data distribution unit 13 to the IQ plane as m bits/carrier symbols, generates carrier symbols to which carrier modulation according to the modulation method is applied, and performs polarization/ It outputs to the interleaving unit 20 between channels.

The polarization/channel interleaving unit 20 arranges the order of carrier symbols input from the mapping units 14-1 to 14-4 between polarizations (between transmission antennas) and between channels, and for each transmission antenna 19 . Interleaved data is generated and output to the time interleaving units 16-1 to 16-4. The polarization/channel interleaving unit 20 includes, for each predetermined number of carrier symbols, data for first polarization transmission of the first channel, data for second polarization transmission of the first channel, data for transmission of first polarization of the second channel; and data for second polarization transmission of the second channel. A specific example of the interleaving process between polarization and channels will be described later.

The time interleaving unit 16 generates interleaved data by arranging the order of carrier symbols input from the polarization/channel interleaving unit 20 in the time direction, and outputs the data to the frequency interleaving unit 17 .

The frequency interleaving unit 17 generates interleaved data by arranging the order of carrier symbols input from the time interleaving unit 16 in the frequency direction, and outputs the data to the OFDM output processing unit 18 . For example, the interleaving process is performed by the method implemented in ISDB-T, and interleaving is performed in the frequency direction for every 1 OFDM symbol.

The OFDM output processing unit 18 performs OFDM frame construction processing, IFFT processing, and GI processing for each stream input from the frequency interleaving unit 17 as in the first embodiment. Then, the transmitter 3 transmits the OFDM signal of the first channel through the transmit antennas 19-1 and 19-2, and transmits the OFDM signal of the second channel through the transmit antennas 19-3 and 19-4. do.

[receiving device]

Next, a reception apparatus according to the second embodiment will be described. 12 is a block diagram showing the configuration of a reception apparatus according to a second embodiment of the present invention. As shown in FIG. 12 , the reception device 4 includes an input processing unit 220-1 for a first channel, an input processing unit 220-2 for a second channel, and two transmission path response calculation units 23 ) (23-1 and 23-2), four frequency deinterleave units 24 (24-1 to 24-4), and four time deinterleave units 25 (25-1 to 25-4) , two MIMO detection units 26 (26-1 and 26-2), a data polarization/channel deinterleave unit 41, a noise variance calculation unit 28, and a noise dispersion value polarization/channel-to-channel deinterleave unit 41 The interleaving unit 42, the four LLR calculating units 30 (30-1 to 30-4), the data integration unit 31, the bit deinterleaving unit 32, and the error correction code decoding unit 33 ), and four reception antennas 21 (21-1 to 21-4) are connected to the reception device 4 . In addition, the receiving device 4 may be comprised by one or a plurality of semiconductor chips.

The reception device 4 receives the OFDM signal of the first channel transmitted from the transmission antennas 19-1 and 19-2 of the transmission device 3 by the reception antennas 21-1 and 21-2, , by the reception antennas 21-3 and 21-4, the OFDM signal of the second channel transmitted from the transmission antennas 19-3 and 19-4 of the transmission apparatus 3 is received. That is, 2x2 MIMO transmission for the number of channels is realized by the transmitting device 3 and the receiving device 4 .

The OFDM input processing unit 22 performs GI removal processing, FFT processing, and pilot signal extraction processing on the OFDM signal received by each reception antenna 21 as in the first embodiment, respectively.

For the received signal of the first channel processed by the input processing unit 220-1 for the first channel, the transmission path response calculating unit 23-1, the frequency deinterleaving units 24-1 and 24-2, , the time deinterleave units 25-1 and 25-2 and the MIMO detection unit 26-1 perform processing similar to the first embodiment. In addition, with respect to the received signal of the second channel processed by the input processing unit 220-2 for the second channel, the transmission path response calculating unit 23-2 and the frequency deinterleaving units 24-3 and 24-4 ), the time deinterleave units 25-3 and 25-4, and the MIMO detection unit 26-2 perform processing similar to the first embodiment.

The data polarization/channel deinterleave unit 41 deinterleaves the data input from the MIMO detection unit 26 between the polarization waves and the channels, and outputs the data to the LLR calculation unit 30 . The deinterleaving process between polarized waves and between channels is a process of returning the data arranged between polarized waves and between channels by the polarization/channel interleaving unit 20 of the transmitter 1 to the original order.

The noise variance calculation unit 28 obtains an average noise variance from each polarization signal input from the MIMO detection unit 26 , and outputs it to the noise variance value polarization/channel-to-channel deinterleave unit 42 .

The noise dispersion value polarization/channel-to-channel deinterleave unit 42 performs deinterleaving processing between waves and channels on the noise dispersion corresponding to each polarized signal input from the noise dispersion calculation unit 28 . and output to the LLR calculation unit 30 . The LLR calculation unit 30, the data integration unit 31, the bit deinterleave unit 32, and the error correction code decoding unit 33 perform a process similar to that of the first embodiment on the received signal for two channels. Conduct.

[Interleaved section between polarization and channels]

Next, the polarization/channel interleaving unit 20 will be described. Also in the second embodiment, similarly to the first embodiment, first to fourth examples of interleaving processing will be described.

[First example of interleaving processing between polarization and channels]

FIG. 13 is a diagram for explaining an example of the first interleaving process of the polarization/channel interleaving unit 20. As shown in FIG. In the first example, every OFDM carrier symbol equal to the number of transmit antennas is arranged in carrier symbol units according to a predetermined rule. When the number of carrier symbols in the OFDM carrier symbol is N, the polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and the mapping unit 14 In -2), carrier symbols of carrier symbol numbers N to 2N-1 are inputted, carrier symbols of carrier symbol numbers 2N to 3N-1 are inputted in the mapping unit 14-3, and carrier symbols of carrier symbol numbers 2N to 3N-1 are inputted in the mapping unit 14-4 Carrier symbol numbers 3N to 4N-1 are inputted. In the first example, the polarization/channel interleaving unit 20 writes the carrier symbols one row (p pieces) in the row direction, and then reads them out one column (2q pieces) in the column direction at a time. p×2q = 4N.

Similarly, the polarization/channel interleaving unit 20 associates the positions of the carrier symbols before alignment with the positions of the carrier symbols after alignment with respect to OFDM carrier symbols corresponding to the number of transmission antennas according to a predetermined rule (rule table) It is free to have in advance. In this case, the polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and the mapping unit 14-2 with carrier symbol numbers N to Carrier symbols of 2N-1 are inputted, carrier symbols of carrier symbol numbers 2N to 3N-1 are inputted in the mapping unit 14-3, and carrier symbols of carrier symbol numbers 3N to 4N-1 are inputted in the mapping unit 14-4. Carrier symbols are input, and a rule table is referred and arranged for every 4N carrier symbols in total.

[Second example of interleaving processing between polarization and channels]

Next, a second example of polarization/channel interleaving processing will be described. 14 is a diagram for explaining an example of the second interleaving process of the polarization/channel interleaving unit 20. FIG. In the first example, every OFDM carrier symbol for the number of transmit antennas and according to a predetermined rule, in the second example, every OFDM carrier symbol for the number of transmit antennas, according to a predetermined rule, the IQ plane It is different in that it is arranged in units of I data placed above the I-axis coordinate of , and Q data placed above the Q-axis coordinate of the IQ plane.

That is, in the second example, if the number of carrier symbols is N, the polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and I It is decomposed into data and Q data to be IQ data of data numbers 0 to 2N-1, and carrier symbols of carrier symbol numbers N to 2N-1 are input in the mapping unit 14-2, and decomposed into I data and Q data Thus, it is set as IQ data of data numbers 2N to 4N-1, and carrier symbols of carrier symbol numbers 2N to 3N-1 are input in the mapping unit 14-3, decomposed into I data and Q data, and data numbers 4N to 6N IQ data of -1, carrier symbols of carrier symbol numbers 3N to 4N-1 are input in the mapping unit 14-4, and decomposed into I data and Q data to IQ data of data numbers 6N to 8N-1 do. Then, after writing IQ data one row (p pieces) in the row direction, one column (4q pieces) is read out in the column direction. After interleaving, a new carrier symbol (a pair of I and Q data) is constructed. p×4q = 8N.

Similarly, the polarization/channel interleaving unit 20 associates the positions of the IQ data before alignment and the positions of the IQ data after alignment with respect to OFDM carrier symbols corresponding to the number of transmission antennas according to a predetermined rule (rule table) It is free to have in advance. In this case, the polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, decomposes them into I data and Q data, and data numbers 0 to 2N IQ data of -1, carrier symbols of carrier symbol numbers N to 2N-1 are input in the mapping unit 14-2, and decomposed into I data and Q data to IQ data of data numbers 2N to 4N-1 In the mapping unit 14-3, carrier symbols of carrier symbol numbers 2N to 3N-1 are input, decomposed into I data and Q data to obtain IQ data of data numbers 4N to 6N-1, and the mapping unit 14 In -4), the carrier symbols of the carrier symbol numbers 3N to 4N-1 are input, and it is decomposed into I data and Q data to obtain IQ data of the data numbers 6N to 8N-1. Then, for each IQ data of 8N in total, it is arranged with reference to the rule table.

[Third example of interleaving processing between polarization and channels]

Next, a third example of polarization/channel interleaving processing will be described. In the third example, the polarization/channel interleaving unit 20 randomly associates the positions of the carrier symbols before alignment with the positions of the carrier symbols after alignment with respect to OFDM carrier symbols corresponding to the number of transmission antennas (irregular table) have in advance Then, the polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, and carrier symbol numbers N to 2N from the mapping unit 14-2. Carrier symbols of -1 are inputted, carrier symbols of carrier symbol numbers 2N to 3N-1 are inputted in the mapping unit 14-3, and carriers of carrier symbol numbers 3N to 4N-1 are inputted in the mapping unit 14-4 A symbol is input, and an irregularity table is referred and arranged for every 4N carrier symbols in total.

[Fourth example of interleaving processing between polarization and channels]

Next, a fourth example of polarization/channel interleaving processing will be described. In the third example, the irregular arrangement is different for every OFDM carrier symbol for a number of transmit antennas and in units of carrier symbols, whereas in the fourth example, for every OFDM carrier symbol for a number of transmit antennas, irregularly arranged in units of IQ data is different. .

That is, in the fourth example, the polarization/channel interleaving unit 20 randomly associates the positions of the IQ data before alignment with the positions of the IQ data after alignment with respect to OFDM carrier symbols corresponding to the number of transmission antennas (irregular). table) in advance. The polarization/channel interleaving unit 20 inputs carrier symbols of carrier symbol numbers 0 to N-1 from the mapping unit 14-1, decomposes them into I data and Q data, and divides them into data numbers 0 to 2N-1. As IQ data, carrier symbols of carrier symbol numbers N to 2N-1 are input in the mapping unit 14-2, and decomposed into I data and Q data to obtain IQ data of data numbers 2N to 4N-1, and mapping In the section 14-3, input carrier symbols of carrier symbol numbers 2N to 3N-1, decompose into I data and Q data to obtain IQ data of data numbers 4N to 6N-1, and a mapping section 14-4 Inputs carrier symbols of carrier symbol numbers 3N to 4N-1 in , and decomposes into I data and Q data to obtain IQ data of data numbers 6N to 8N-1. Then, for every IQ data of 8N in total, an irregular table is referred to and sorted. After interleaving, a new carrier symbol (a pair of I and Q data) is constructed.

In addition, in the above-described example of interleaving between polarizations, the interleaving unit 20 between polarizations and channels 20 aligns in units of carrier symbols or in units of IQ data for every OFDM carrier symbol equal to the number of transmission antennas, but every number of carrier symbols It may be arranged in a carrier symbol unit or an IQ data unit.

In addition, when the polarization/channel interleaving unit 20 aligns the carrier symbols in units of IQ data in the second or fourth example described above, only one of the I data and the Q data may be aligned.

On the other hand, the data polarization/channel deinterleaving unit 41 aligns the data separated by MIMO by the MIMO detecting unit 26 in the reverse direction to the polarization/channel interleaving unit 20 and returns it to the original order. For example, when the polarization/channel interleaving unit 20 performs the interleaving process of the first example described above, the data polarization/channel deinterleaving unit 41 transfers data in one row (2q pieces) in the row direction. ), and then read out one column (p pieces) in the column direction. In addition, when the polarization/channel interleaving unit 20 performs the interleaving process of the second example described above, the data polarization/channel deinterleaving unit 41 transfers data one row (4q pieces) in the row direction. After writing, one column (p pieces) is read in the column direction. In addition, when the polarization/channel interleaving unit 20 performs interleaving processing using the above table (rule table or irregular table), the data polarization/channel deinterleaving unit 41 arranges the table Sort by referring to the table in which the front and rear positions have been swapped.

In addition, the data polarization/channel deinterleaving unit 41 is an odd numbered polarization/channel interleaving unit 20 when only one of the I data and the Q data is arranged in the second or fourth example described above. Only one of the data of and even-numbered data is sorted.

The data polarization/channel deinterleave unit 41 is a MIMO detection unit 26 ), after deinterleaving between polarization and channels, adjacent data are generated as I data placed on the I-axis coordinate of the IQ plane and Q data placed on the Q-axis coordinate to generate a carrier symbol. do.

The noise dispersion value polarization/channel deinterleave unit 42 calculates the noise dispersion input from the noise dispersion calculation unit 28 in the same way as the data polarization/channel deinterleave unit 41 polarization/channel interleave unit 20 ) and in the reverse direction.

In this way, the transmitter 3 arranges the order of carrier symbols for a plurality of channels by the polarization/channel interleaving unit 20 between polarized waves and between channels, and interleaved data for each transmit antenna 19 . and transmits OFDM signals of multiple channels. Further, the reception device 4 receives OFDM signals of a plurality of channels, and through the data polarization/channel deinterleave unit 41 and the noise dispersion value polarization/channel deinterleave unit 42, the transmission device 3 ), deinterleave data for a plurality of channels interleaved between polarized waves and between channels. For this reason, according to the transmitting apparatus 3 and the receiving apparatus 4 of 2nd Embodiment, even when there exists a reception level difference between polarization waves similarly to 1st Embodiment also when performing bulk transmission using multiple channels, an error Data on the polarization side containing a lot of data can be distributed. Also, even when co-channel interference occurs in only one channel, it is possible to distribute data on the one-channel side containing a lot of erroneous data. As a result, it is possible to improve the effect of the error correction code, thereby improving the BER characteristic.

In addition, the reception device 4 arranges a time deinterleave unit 25 before the MIMO detection unit 26 , and the transmission device 3 provides a time interleave unit 16 after the polarization/channel interleave unit 20 . are placing Therefore, according to the present invention, it is possible to realize the receiving device 4 that repeatedly performs demodulation/decoding processing without increasing the circuit scale.

Although the above-mentioned embodiment was demonstrated as a representative example, it is clear to those skilled in the art that many changes and substitution can be made within the meaning and range of this invention. Accordingly, the present invention should not be construed as being limited by the above-described embodiment, and various modifications and changes can be made without departing from the scope of the claims.

For example, in the above embodiment, the case where the error correction coding unit 11 of the transmission device 1 adopts the LDPC code as the inner code has been described. However, the case where the LDPC code is not employed as the inner code In this case, the receiving device 2 may not include the noise dispersion calculation unit 28 , the noise dispersion value inter-polarization deinterleave unit 29 , and the LLR calculation unit 30 . In addition, in the above embodiment, the case where the transmitting apparatus and the receiving apparatus according to the present invention are applied to 2x2 MIMO transmission has been described, but it goes without saying that it can also be applied to 2x4 or 4x4 MIMO transmission. .

Industrial Applicability

As described above, the present invention is useful for a MIMO system that performs SDM-MIMO transmission.

1, 3: Transmitting device
2, 4: Receiving device
11: Error Correction Encoder
12: bit interleaved unit
13: data distribution unit (antenna stream demultiplexer)
14: mapping unit
15: Interleaved between polarizations (MIMO precoder)
16-1, 16-2, 16-3, 16-4: time interleaved part
17-1, 17-2, 17-3, 17-4: frequency interleaved part
18-1, 18-2, 18-3, 18-4: OFDM output processing unit
19-1, 19-2, 19-3, 19-4: transmit antenna
20: Interleaved section between polarization and channels
21-1, 21-2, 21-3, 21-4: receive antenna
22-1, 22-2: OFDM input processing unit
23, 23-1, 23-2: transmission path response calculator
24-1, 24-2, 24-3, 24-4: frequency deinterleave unit
25-1, 25-2, 25-3, 25-4: time deinterleave unit
26, 26-1, 26-2: MIMO detection unit
27: De-interleave unit between data polarizations
28: noise variance calculator
29: deinterleaved portion between polarized noise dispersion values
30: LLR output unit
31: data integration unit
32: bit deinterleave unit
33: error correction code decoding unit
41: Data polarization/channel deinterleaving unit
42: Noise dispersion value polarization/channel-to-channel deinterleaving unit
180-1: output processing unit for the first channel
180-2: output processing unit for the second channel
181-1, 181-2, 181-3, 181-4: OFDM frame component
182-1, 182-2, 182-3, 182-4: IFFT part
183-1, 183-2, 183-3, 183-4: GI Bugaboo
220-1: input processing unit for the first channel
220-2: input processing unit for the second channel
221-1, 221-2, 221-3, 221-4: GI removal unit
222-1, 222-2, 222-3, 222-4: FFT part
223-1, 223-2, 223-3, 223-4: pilot signal extraction unit

Claims (4)

A transmitting apparatus for generating an OFDM signal transmitted by a plurality of transmit antennas, the transmitting apparatus comprising:
a data distribution unit for distributing data to each of the transmitting antennas;
a mapping unit for mapping the data distributed by the data distribution unit to the IQ plane and generating carrier symbols to which carrier modulation is applied;
After decomposing a plurality of the carrier symbols into I data disposed on the I-axis coordinate of the IQ plane and Q data disposed on the Q-axis coordinate, one of I data and Q data according to a predetermined rule between the plurality of transmit antennas an interleaving unit between polarizations for generating interleaved data between polarized waves in which (one square) is aligned;
a time interleaving unit for generating time interleaved data obtained by interleaving the interleaved data between polarized waves in a time direction for each of the transmit antennas;
OFDM output processing unit generating an OFDM signal with respect to the time interleaved data
A transmitting device comprising a. A receiving apparatus for demodulating an OFDM signal received by a plurality of receiving antennas, the receiving device comprising:
an OFDM input processing unit for demodulating the OFDM signal and generating a complex baseband signal;
a time deinterleave unit for generating time deinterleave data obtained by deinterleaving the complex baseband signal in a time direction for each of the reception antennas;
a MIMO detection unit for MIMO separation of the time deinterleaved data;
For a plurality of MIMO-separated data by the MIMO detector, one of odd-numbered data and even-numbered data is aligned according to a predetermined rule among the plurality of reception antennas, and then adjacent data is combined with the I-axis of the IQ plane. A deinterleave unit between the data polarization that generates a carrier symbol as I data placed on the coordinates and Q data placed on the Q axis coordinates
A receiving device comprising a. A semiconductor chip that generates an OFDM signal transmitted by a plurality of transmit antennas, the semiconductor chip comprising:
a data distribution unit for distributing data to each of the transmitting antennas;
a mapping unit for mapping the data distributed by the data distribution unit to the IQ plane and generating carrier symbols to which carrier modulation is applied;
After decomposing a plurality of the carrier symbols into I data disposed on the I-axis coordinate of the IQ plane and Q data disposed on the Q-axis coordinate, one of I data and Q data according to a predetermined rule between the plurality of transmit antennas An interleaving unit between polarizations that generates interleaved data between polarized waves in which the
a time interleaving unit for generating time interleaved data obtained by interleaving the interleaved data between polarized waves in a time direction for each of the transmit antennas;
OFDM output processing unit generating an OFDM signal with respect to the time interleaved data
A semiconductor chip comprising a. A semiconductor chip for demodulating an OFDM signal received by a plurality of receiving antennas, the semiconductor chip comprising:
an OFDM input processing unit for demodulating the OFDM signal and generating a complex baseband signal;
a time deinterleave unit for generating time deinterleave data obtained by deinterleaving the complex baseband signal in a time direction for each of the reception antennas;
a MIMO detection unit for MIMO separation of the time deinterleaved data;
For a plurality of MIMO-separated data by the MIMO detector, one of odd-numbered data and even-numbered data is aligned according to a predetermined rule among the plurality of reception antennas, and then adjacent data is combined with the I-axis of the IQ plane. A deinterleave unit between the data polarization that generates a carrier symbol as I data placed on the coordinates and Q data placed on the Q axis coordinates
A semiconductor chip comprising a.

Images