JP7128657B2 - Transmitting device, receiving device, transmitting/receiving system, and chip - Google Patents

Description

The present invention relates to a transmitter, a receiver, a transmission/reception system, and a chip, and more particularly to a transmitter, a receiver, a transmission/reception system, and a chip using OFDM (Orthogonal Frequency Division Multiplexing) modulated signals.

Current terrestrial television broadcasting in Japan uses the ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) system (Non-Patent Document 1). ISDB-T is a broadcasting system for digital terrestrial television broadcasting, in which one channel frequency band (approximately 6 MHz) is divided into 14 segments, of which 13 OFDM segments constitute the transmission band.

Hierarchical transmission is used in current terrestrial television broadcasting, and a plurality of services with different image quality and noise immunity are provided in the same channel. Specifically, one segment in the center of the transmission band is used as a partial reception band for mobile receiving terminals (mobile terminals), and a layer A transmission service (so-called one-segment broadcasting) transmits video using a transmission method with strong noise immunity. ), the other 12 segments are used as non-partial reception bands, and high-quality video is transmitted to fixed receiving terminals (home TVs, etc.) using a transmission method with weaker noise immunity compared to one-segment broadcasting. It is used for hierarchical transmission services (high-definition broadcasting, etc.).

In recent years, high-definition video called Super Hi-Vision (8K: 7680 pixels x 4320 lines), which has 16 times the resolution of high-definition broadcasting, has been put into practical use. is being considered. In this next-generation terrestrial digital broadcasting system, high-performance, high-quality broadcasting such as super high-definition broadcasting will replace conventional high-definition broadcasting for fixed receivers installed in homes that receive non-partial reception band data. In addition, there is a demand to provide high-definition broadcast-level services to mobile receivers that receive partial reception band data.

In next-generation terrestrial transmission systems, the introduction of various modulation schemes and new transmission schemes is being studied to increase transmission capacity. -Output) transmission method and MISO (Multi-Input Single-Output) transmission method in which a transmitting side uses a plurality of antennas and a receiving side uses a single antenna are being vigorously researched. Of these, MIMO based on Space Division Multiplexing (SDM) spatially multiplexes streams by simultaneously transmitting multiple information signals (streams) in the same frequency band according to the number of transmit antennas. It is a transmission method, and can greatly increase the transmission capacity, that is, increase the transmission rate. Furthermore, the space division multiplexing MIMO-OFDM system, which combines this MIMO transmission system with the OFDM modulation system with high frequency utilization efficiency and excellent resistance to frequency selective fading, is the most promising next-generation terrestrial transmission system. method.

FIG. 4 shows an example of a conventional space division multiplexing MIMO-OFDM transmitting/receiving system (Non-Patent Document 2). In FIG. 4, the upper block is the transmitter and the lower block is the receiver.

In the receiving device, input data (Data) is divided into a plurality of data strings by a demultiplexer (DeMUX), and each data string is input to each encoder. The data that has undergone predetermined encoding/mapping processing, etc. in the encoder and converted into carrier symbols is put together in the entire system and rearranged spatially and frequency-wise by an SF interleaver (Space-Frequency Interleaver). The data (x ₁ , x ₂ , . . . x _m ) transmitted from the antennas is subjected to IFFT (Inverse Fast Fourier Transform) processing, and transmitted from each antenna through predetermined modulation processing (not shown). .

A transmission signal is transmitted by space division multiplexing and received by a receiving device via a spatial transmission path (MIMO channel). A signal received by each receiving antenna is subjected to a predetermined demodulation process (not shown), then subjected to FFT (Fast Fourier Transform) processing, and transformed received data (y ₁ , y ₂ , . . . y _n ) from , the MIMO detector estimates and derives the transmission signal data (x ₁ , x ₂ , . . . x _m ). After that, an SF deinterleaver (Space-Frequency Deinterleaver) performs rearrangement processing opposite to that on the transmission side to restore the original multiple carrier symbol strings. Each carrier symbol string is subjected to decoding processing such as demapping processing in each decoder, decoded into each data string, then synthesized by a multiplexer (MUX), and output as original data (Data).

ARIB STD-B31, "Transmission system for terrestrial digital television broadcasting" L.Hanzo, J.Akhtman, L. Wang, M. Jiang, "MIMO-OFDM for LTE, WiFi, and WiMAX", John Wiley & Sons, (2011)

In a space division multiplexing MIMO-OFDM transmitting/receiving system, interleave processing is performed in order to increase transmission resistance. However, in the conventional transmitting/receiving apparatus, as shown in FIG. 4, multiple systems of data are collectively interleaved, so the processing is complicated and the scale of the interleaver and deinterleaver is large. Also, in the transition period to the MIMO system, coexistence with the SISO (Single-Input Single-Output) system with one transmitting antenna and one receiving antenna is required, but the interleaver and deinterleaver in FIG. 4 are shared with SISO. I can't. Therefore, separate interleavers are designed for SISO and MIMO respectively, and the configuration becomes complicated when producing a transmitting/receiving apparatus compatible with both systems.

Therefore, an object of the present invention, which has been made in view of the above problems, is to obtain a frequency interleaving effect even when spatial correlation is high without increasing the complexity of processing in a space division multiplexing MIMO-OFDM system. To provide a transmitting device, a receiving device, a transmitting/receiving system, and a chip capable of

In order to solve the above problems, a transmission apparatus according to the present invention is a transmission apparatus of a space division multiplexing MIMO-OFDM system, a system separation unit for separating data into 1-system data and 2-system data, A first frequency interleaving unit for frequency interleaving data and a second frequency interleaving unit for frequency interleaving the two-system data, wherein processing in the first frequency interleaving unit and the second frequency interleaving unit The processing in the unit is characterized in that the interleaving processing and the deinterleaving processing are related.

The transmission device comprises a memory for each of the first frequency interleaving section and the second frequency interleaving section, and the first frequency interleaving section and the second frequency interleaving section have read addresses and write addresses for the memory. should be replaced with each other.

Further, in order to solve the above problems, a receiving apparatus according to the present invention is a space division multiplexing MIMO-OFDM receiving apparatus that includes a first frequency deinterleaving unit that frequency deinterleaves data of the 1st system, a second frequency deinterleaving unit for frequency deinterleaving data; and a system synthesis unit for synthesizing the frequency deinterleaved data of the first system and the data of the second system, wherein the first frequency deinterleaving unit and the processing in the second frequency deinterleaving unit are in a relationship between deinterleaving processing and interleaving processing.

In the receiving device, the first frequency deinterleaving section and the second frequency deinterleaving section are configured by memories, and the first frequency deinterleaving section and the second frequency deinterleaving section read out from the memory. It is desirable to interchange the addresses and write addresses with each other.

Further, in order to solve the above problems, a transmitting/receiving system according to the present invention is a space division multiplexing MIMO-OFDM transmitting/receiving system in which data is separated into system 1 data and system 2 data and transmitted and received, and the transmitting side In the frequency interleaving of data at the receiver side and the frequency deinterleaving of data at the receiving side, the processing of system 1 and the processing of system 2 are performed independently, and the frequency interleaver of system 2 on the transmitting side is the frequency deinterleaver of system 1. It is characterized in that the frequency deinterleave processing performed by the interleaver is performed, and the frequency deinterleaver of system 2 on the receiving side performs the frequency interleave processing performed by the frequency interleaver of system 1 .

Further, in order to solve the above problems, a chip according to the present invention is a chip mounted in a transmitting device or a receiving device of a space division multiplexing MIMO-OFDM system, and performs frequency interleaving on data of one series. An interleaver and a deinterleaver that performs frequency deinterleaving, which is an inverse process of the frequency interleaving, on data of the other series, and when installed in a transmission device, the data is divided into the data of the first series and the data of the first series. 2-system data is input, and frequency interleaving for 1-system data and frequency interleaving for 2-system data have a relationship between interleaving processing and de-interleaving processing. System 1 data and system 2 data that are systematically combined after interleaving processing are input, and frequency deinterleaving for system 1 data and frequency deinterleaving for system 2 data is the relationship between interleaving processing and deinterleaving processing. It is characterized by becoming

According to the transmitting device, receiving device, transmitting/receiving system, and chip of the present invention, in the space division multiplexing MIMO-OFDM system, without increasing the complexity of the processing, it is possible to obtain the frequency interleaving effect even when the spatial correlation is high. can.

4 is a block diagram showing a configuration example of a modulator of the transmitting apparatus according to Embodiment 1; FIG. FIG. 11 is a block diagram showing a configuration example of a demodulator of a receiving apparatus according to Embodiment 2; 3 is a block diagram showing configurations of a frequency interleaving section and a frequency deinterleaving section of the present invention; FIG. 1 is a block diagram showing a configuration example of a conventional space-division multiplexing MIMO-OFDM transmitting/receiving system; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a modulator of a transmitting apparatus according to Embodiment 1 of the present invention. The block diagram of the modulator of the transmitter 100 of FIG. 1 shows from the data input interface to the IF signal output.

The modulator of the transmitter 100 includes an input I/F (interface) 10, a bit IL (interleave) unit 11, a frame header generation unit 12, a mapping unit 13, a level adjustment unit 14, and a system separation unit. 15, a hierarchical synthesis unit 16, a band division unit 17, a time IL unit 18, a frequency IL unit 19, a band synthesis unit 20, a TMCC (Transmission and Multiplexing Configuration Control) information bit generation unit 22, and a synchronization bit A generating unit 23, a TMCC generating unit 24, a pilot generating unit 25, an OFDM frame configuration unit 26, an IFFT (Inverse Fast Fourier Transform) unit 27, a GI (Guard interval) adding unit 28, and a quadrature modulation unit 29 , and a DAC (digital to analog converter) section 30 . An IF (Intermediate Frequency) signal output 1 and an IF signal output 2, which are outputs of the modulator, are output from different transmission systems (antennas) after performing predetermined modulation processing.

An input I/F (interface) 10 is an interface through which data to be transmitted is inputted, and various data such as image signal data and control data relating to a transmission method are inputted. For example, data to be an image signal is divided into three layers, A layer, B layer, and C layer, according to need, and is output to the processing system of each layer. Also, the control data is output as, for example, TMCC information or Lch data.

A bit IL (Interleave) unit 11 (11a, 11b, 11c) interleaves the data strings of the A layer, the B layer, and the C layer in units of bits. Bit unit interleaving includes, for example, bit rotation in which a bit string is divided into blocks in a predetermined unit and the order of bits within each block is changed. The data string subjected to bitwise interleaving is output to the mapping section 13 .

A frame header generation unit 12 generates a frame header for each layer data based on the frame header information of each data string, an FEC (forward error correction) pointer, etc., and inserts it into each data string. The data string with the frame header inserted is sent to the mapping section 13 .

The mapping units 13 (13a, 13b, 13c) map data on the IQ plane for each predetermined number of bits based on the modulation scheme of each hierarchical data, and perform carrier modulation. That is, it converts the data into carrier symbols. The generated carrier symbols are output to the level adjustment section 14 .

The level adjuster 14 (14a, 14b, 14c) adjusts the level of the carrier symbol for each layer. The adjusted carrier symbols are output to system separation section 15 .

The system separation unit 15 (15a, 15b, 15c) is a demultiplexer and separates the input carrier symbols into a plurality of systems (here, two systems). One of the separated carrier symbols of each layer is sent to the layer synthesis unit 16 ₁ of the first system (hereinafter simply referred to as "system 1") and the other to the second system (hereinafter simply referred to as "system 2"). .) is output to the hierarchical synthesizing unit 16 ₂ . When the MIMO transmission system is performed with three or more transmission systems, data is separated according to the number of transmission systems.

Hierarchical combining units 16 (16 ₁ , 16 ₂ ) hierarchically combine the carrier symbols of the A, B, and C layers input from the system separating unit 15, respectively. The hierarchically combined carrier symbols are output to the band dividing section 17 for each system.

The band dividing section 17 (17 ₁ , 17 ₂ ) divides the hierarchically combined carrier symbols into respective bands. For example, part of the C layer data is divided into adjustment bands as needed. The band-divided carrier symbols are output to the time IL unit 18 .

A time IL (interleaving) unit 18 (18 ₁ , 18 ₂ ) interleaves band-divided carrier symbols in the time direction (that is, in the forward direction of symbol arrangement in each carrier). The time-interleaved carrier symbols are output to frequency IL section 19 .

A frequency IL (interleave) unit 19 (19 ₁ , 19 ₂ ) performs interleaving in the carrier frequency direction. The configuration of this frequency interleaving section 19 (19 ₁ , 19 ₂ ) is a feature of the present invention. As will be described later, the 1-system frequency interleaver 19 ₁ and the 2-system frequency interleaver 19 ₂ have a relationship of interleaver and deinterleaver. The frequency-interleaved carrier symbols are output to band combining section 20 .

The band synthesizing section 20 (20 ₁ , 20 ₂ ) synthesizes carrier symbols of the frequency-interleaved partial reception band, non-partial reception band, and adjustment band to form a data segment. The 1-system carrier symbol x1 is output from the 1-system band synthesizing unit 20 ₁ , and the 2-system carrier symbol x2 is output from the 2-system band synthesizing unit 20 ₂ , and these carrier symbols x1 and x2 form the OFDM frame structure. Output to the unit 26 .

The TMCC information bit generator 22 receives TMCC information (various control information) from the input I/F 10 , generates TMCC information bits, and outputs the TMCC information bits to the TMCC generator 24 .

The synchronous bit generator 23 generates a synchronous bit that is part of the TMCC and outputs it to the TMCC generator 24 .

The TMCC generation unit 24 receives the TMCC information bits from the TMCC information bit generation unit 22, the synchronization bits from the synchronization bit generation unit 23, and the FEC pointer information, and generates a TMCC. The generated TMCC is output to the OFDM frame construction section 26 .

The pilot generator 25 generates a pilot signal (SP (Scattered Pilot) signal, CP (Continual Pilot) signal, etc.) to be incorporated into the OFDM frame. The generated pilot signal is output to OFDM frame construction section 26 .

The OFDM frame constructing units 26 (26 ₁ , 26 ₂ ) construct an OFDM frame by adding TMCC, pilot signal, and Lch signal to the input carrier symbol (data segment). The 1-system OFDM frame configuration unit 26 ₁ generates a 1-system OFDM frame based on the 1-system carrier symbol x1, and the 2-system OFDM frame configuration unit 26 ₂ generates a 2-system OFDM frame based on the 2-system carrier symbol x2. Generate an OFDM frame. The generated OFDM frames are output to the IFFT section 27 respectively.

The IFFT section 27 (27 ₁ , 27 ₂ ) performs IFFT (Inverse Fast Fourier Transform) on the input OFDM frame to generate an effective symbol signal. The generated effective symbol signal is output to the GI adding section 28 .

The GI adder 28 (28 ₁ , 28 ₂ ) adds a guard interval, which is a signal obtained by copying a part of the end of the effective symbol signal, to the beginning of the effective symbol signal input from the IFFT unit 27 . The guard interval is set so that the delay time of multipath delayed waves does not exceed the guard interval length. The signal to which the guard interval is added is output to quadrature modulation section 29 .

The quadrature modulation section 29 (29 ₁ , 29 ₂ ) quadrature-modulates the input OFDM symbol signal and outputs the result to the DAC section 30 .

The DAC unit 30 (30 ₁ , 30 ₂ ) digital/analog converts the quadrature-modulated OFDM symbol signal and outputs an IF signal. IF signal output 1 is output from the 1-system DAC section 30 ₁ , and IF signal output 2 is output from the 2-system DAC section 30 ₂ .

IF signal outputs 1 and 2 are output from different antennas after performing predetermined modulation processing.

Thus, the modulator of transmitting apparatus 100 of Embodiment 1 is configured. Data processing including interleave processing for the 1st and 2nd systems is performed independently of each other, and the processing is also simplified.

(Embodiment 2)
FIG. 2 is a block diagram showing a configuration example of a demodulator of a receiving apparatus according to Embodiment 2 of the present invention. The block diagram of the demodulator of the receiver 200 in FIG. 2 shows from the IF signal input to the output of each hierarchical data.

The demodulator of the receiving apparatus 200 includes an ADC (analog to digital converter) unit 41, an orthogonal demodulation unit 42, a GI removal unit 43, an FFT (Fast Fourier Transform) unit 44, an equalization/decoding unit 45, and a band Separating section 46, frequency deinterleaving section 47, time deinterleaving section 48, band synthesizing section 49, layer separating section 50, system synthesizing section 51, level adjusting section 52, demapping section 53, bit and a deinterleaver 54 . Each of the output hierarchical data is then subjected to predetermined processing such as error correction, and then decoded as, for example, image data.

ADC unit 41 (41 ₁ , 41 ₂ ) receives IF signal input 1: y1 and IF signal input 2: y2 obtained by converting signals received by each antenna by a frequency converter (not shown), and converts them into analog signals. / Perform digital conversion processing. The digitized signal is output to the quadrature demodulator 42 .

The quadrature demodulator 42 ( 42 ₁ , 42 ₂ ) performs quadrature demodulation on the digitized input signal to obtain a predetermined baseband signal corresponding to a symbol signal, and then outputs the baseband signal to the GI remover 43 .

The GI removal section 43 (43 ₁ , 43 ₂ ) removes the guard interval (GI) from the quadrature-demodulated received signal and outputs it to the FFT section 44 as a signal of effective symbol length.

The FFT section 44 (44 ₁ , 44 ₂ ) performs FFT (Fast Fourier Transform) processing on the signal from which the guard interval has been removed, and outputs the processed two signals together to the equalization/decoding section 45. .

The equalization/decoding unit 45 estimates the original transmitted carrier symbols from the two FFT-processed input signals. In MIMO transmission, since signals from multiple transmitting antennas are mixed and received by multiple receiving antennas, mathematical processing is performed to separate the original carrier symbols transmitted from each transmitting antenna. do. Although there are various methods for this mathematical processing, for example, processing such as ZF (Zero forcing) method and MLD (Maximum likelihood Detection) method is used. As a result of this decoding process, a 1-system carrier symbol and a 2-system carrier symbol are separated and output. The 1-system carrier symbol is output to the 1-system band separation section 46 ₁ , and the 2-system carrier symbol is output to the 2-system band separation section 46 ₂ .

The band separators 46 (46 ₁ , 46 ₂ ) separate the input carrier symbols (data segments) into carrier symbols of the partial reception band, the non-partial reception band, and the adjustment band. The separated carrier symbols of each band are output to frequency deinterleaving section 47 .

The frequency deinterleaver 47 (47 ₁ , 47 ₂ ) deinterleaves the carrier symbols of each band in the carrier frequency direction. The configuration of the frequency deinterleaver 47 (47 ₁ , 47 ₂ ) is a feature of the present invention. As will be described later, the 1-system frequency deinterleaver 47 ₁ and the 2-system frequency deinterleaver 47 ₂ have a relationship of interleaver and deinterleaver. The frequency deinterleaved carrier symbols are output to the time deinterleaver 48 .

The time deinterleaving unit 48 (48 ₁ , 48 ₂ ) deinterleaves the frequency-deinterleaved carrier symbols in the time direction (that is, in the forward direction of symbol arrangement in each carrier), and performs interleaving on the transmitting side. Revert to previous original array. The time deinterleaving here may be a process opposite to the time interleaving performed on the transmitting side. The time-deinterleaved carrier symbols are output to band combining section 49 .

The band synthesizing section 49 (49 ₁ , 49 ₂ ) synthesizes the processed data divided into the partial reception band, the non-partial reception band, and the adjustment band, and outputs the synthesized data to the layer separation section 50 .

The layer separation unit 50 (50 ₁ , 50 ₂ ) layer-separates the band-combined data into layer A, B layer, and C layer carrier symbols. The carrier symbols are output to the system combiner 51b, and the C layer carrier symbols are output to the system combiner 51c.

The system combiner 51 (51a, 51b, 51c) is a multiplexer, and combines the carrier symbol data of the 1st system and the 2nd system which have been separately processed. The combined carrier symbols of each layer are output to level adjustment section 52 .

The level adjuster 52 (52a, 52b, 52c) adjusts the level of the combined original carrier symbols for each layer. The level-adjusted carrier symbols are output to demapping section 53 .

The demapping section 53 (53a, 53b, 53c) demodulates the I signal value and the Q signal value of the level-adjusted carrier symbol to the original bit unit data. The bit unit data of each layer is output to the bit deinterleaving unit 54 .

The bit deinterleaving unit 54 (54a, 54b, 54c) deinterleaves the demapped data in bit units to restore the original bit string. The bit deinterleaving here may be a process opposite to the bit interleaving performed on the transmitting side. The bit-deinterleaved data string corresponds to the transmission data of each layer.

Each of the output hierarchical data is then subjected to predetermined processing such as error correction, and then decoded as, for example, image data.

Thus, the demodulator of receiving apparatus 200 of Embodiment 2 is configured. Data processing including deinterleaving processing for the 1st and 2nd systems is performed independently of each other, and the processing is also simplified.

FIG. 3 shows the configuration of the frequency interleaver and the frequency deinterleaver, which are features of the present invention. In FIG. 3, only configurations related to frequency interleaving and frequency de-interleaving are extracted and shown from FIG. 1 and FIG.

The block on the left side of FIG. 3 is the modulator of the spatial division multiplexing MIMO-OFDM transmission apparatus 100, and shows the system separating section 15 and the frequency interleaving section 19 (19 ₁ , 19 ₂ ). The block on the right side is a demodulator of receiving apparatus 200, and shows frequency deinterleaving section 47 (47 ₁ , 47 ₂ ) and system combining section 51 .

The system separation unit 15 is composed of a demultiplexer, and receives carrier symbol sequences S ₀ , S ₁ , S ₂ , S ₃ , . . . S _N-1 as input data. separated into Here, _one carrier symbol sequence _{S 0 , S 2} , . data. Note that any method may be used to separate the data string.

In the modulator, 1-system data flows through the upper signal line in the figure, and is frequency-interleaved by the first frequency interleaver 19 ₁ . The data of system 2 flows through the lower signal line in the drawing, and is frequency interleaved by the second frequency interleaving section 19 ₂ . When the processing (interleaving processing) in the first frequency interleaving unit 19 ₁ at this time is π, the processing in the second frequency interleaving unit 19 ₂ is the reverse processing (de-interleaving processing) π ^-1 . That is, when the processing block 19 ₁ is the interleaver π, the processing block 19 ₂ is the deinterleaver π ⁻¹ .

As an example, the first frequency interleaving unit 19 ₁ and the second frequency interleaving unit 19 ₂ can each be configured using a memory. Deinterleave processing can be realized.

In addition, in the demodulator of the receiving apparatus 200, the data of system 1 flows through the signal line on the upper side in the drawing, and is frequency deinterleaved by the first frequency deinterleaving section 47 ₁ . The data of system 2 flows through the lower signal line in the figure, and is subjected to frequency deinterleaving by the second frequency deinterleaving section 47 ₂ . Since the data of system 1 has undergone frequency interleaving processing π on the transmitting side, the frequency deinterleaving on the receiving side is the inverse processing π ⁻¹ . Also, since the data of system 2 has been subjected to frequency interleaving processing π ⁻¹ on the transmitting side, the frequency deinterleaving on the receiving side is the inverse processing π.

Therefore, in the demodulator, when the processing (deinterleaving processing) in the first frequency deinterleaving section 47 ₁ is π ^-1 , the processing in the second frequency deinterleaving section 47 ₂ is the reverse processing (interleaving processing ), that is, when the processing block 47 ₁ is the deinterleaver π ⁻¹ , the processing block 47 ₂ is the interleaver π.

As an example, the first frequency deinterleaving unit 47 ₁ and the second frequency deinterleaving unit 47 ₂ can each be configured using a memory. Interleave processing and interleave processing can be realized.

The 1-system data (carrier symbol sequence) and the 2-system data (carrier symbol sequence) subjected to frequency deinterleaving are then input to the system synthesis unit 51 after performing predetermined processing. The system synthesizing unit 51 is composed of a multiplexer, synthesizes the 1-system data and the 2-system data, and restores the original data string (carrier symbol string).

In the present invention, in both the frequency interleaving of the modulator and the frequency deinterleaving of the demodulator, since the processing of the 1st system and the processing of the 2nd system are performed independently, the SISO (Single Input Single Output) with 1 system can be used as ^they are. That is, in a space-division multiplexing MIMO-OFDM transmitting/receiving system, the frequency interleaver π and the frequency deinterleaver π ⁻¹ of the 2nd system can be replaced by modulation/demodulation (transmitting/receiving) with respect to the 1st system.

Therefore, the SISO frequency interleaver can be used as it is, and the development efficiency is improved. In addition, since the processing of the 1st system and the 2nd system are independent, the present invention can be configured as a device that uses only the data processing of one system. A receiving device can be realized with a relatively simple configuration. Furthermore, since the interleaver and the deinterleaver can be realized simply by exchanging the read address and write address for the memory, the present invention is easy to implement.

In the present invention, since the frequency interleaver π and the frequency deinterleaver π ⁻¹ of the 1st and 2nd systems are exchanged by modulation/demodulation, the interleaving processes of the 1st and 2nd systems are different from each other. In general, when performing MIMO transmission, there is a case where there is a correlation between the channel characteristics of system 1 and system 2 (for example, when both channel characteristics cause transmission degradation at the same frequency), but system 1 and system 2 are Due to the different frequency interleaving processes, the present invention can obtain excellent frequency interleaving effect even when the spatial correlation is high.

Although the configurations and operations of the transmitting device 100 and the receiving device 200 have been described in the above embodiment, the present invention is not limited to this, and the semiconductor chip mounted on the transmitting device 100 or the receiving device 200 is a semiconductor chip that performs frequency interleaving. It may be configured as a chip having the function of the units 19 (19 ₁ , 19 ₂ ) or the frequency deinterleaving units 47 (47 ₁ , 47 ₂ ). That is, an interleaver π that is installed in a space division multiplexing MIMO-OFDM transmitter or receiver and performs frequency interleaving on one series of data, and the inverse processing of the frequency interleaving on the other series of data It may be configured as a chip including a deinterleaver π ⁻¹ that performs frequency deinterleaving.

Moreover, although the configuration and operation of transmitting apparatus 100 have been described in the first embodiment above, the present invention is not limited to this, and may be configured as a transmission method for transmitting OFDM signals using a plurality of transmission systems. That is, according to the data flow of FIG. 1, a transmission method of the MIMO-OFDM system that modulates the data to be transmitted, separating the carrier symbol string into 1-system data and 2-system data, The first frequency interleaving is performed on the data of the second system, and the second frequency interleaving is performed on the data of the second system. It may be configured as a transmission method characterized by corresponding.

Furthermore, although the configuration and operation of the receiving apparatus 200 have been described in the second embodiment, the present invention is not limited to this, and may be configured as a receiving method for receiving OFDM signals using a plurality of receiving systems. That is, a MIMO-OFDM receiving method for demodulating received data according to the data flow of FIG. After that, the data of system 1 and the data of system 2 are combined to restore the carrier symbol string, where the processing of the second frequency deinterleaving is performed by the first frequency deinterleaving It may be configured as a reception method characterized by corresponding to frequency interleaving, which is the inverse process of .

According to the chip, transmission method and reception method described above, the frequency interleaving effect can be obtained without increasing the processing complexity.

Although the above embodiments have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions may be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as limited by the embodiments described above, and various modifications and changes are possible without departing from the scope of the appended claims. For example, it is possible to combine a plurality of configuration blocks described in the embodiments into one or divide one configuration block.

10 Input I/F
11-bit IL unit 12 Frame header generation unit 13 Mapping unit 14 Level adjustment unit 15 System separation unit 16 Hierarchical synthesis unit 17 Band division unit 18 Time IL unit 19 Frequency IL unit 20 Band synthesis unit 22 TMCC information bit generation unit 23 Synchronization bit generation Unit 24 TMCC generation unit 25 Pilot generation unit 26 OFDM frame construction unit 27 IFFT unit 28 GI addition unit 29 Quadrature modulation unit 30 DAC unit 41 ADC unit 42 Quadrature demodulation unit 43 GI removal unit 44 FFT unit 45 Equalization/decoding unit 46 Band Separating section 47 Frequency deinterleaving section 48 Time deinterleaving section 49 Band synthesizing section 50 Hierarchical separating section 51 System synthesizing section 52 Level adjusting section 53 Demapping section 54 Bit deinterleaving section 100 Transmitting device 200 Receiving device

Claims (6)

In a spatial division multiplexing MIMO-OFDM transmission device,
a system separation unit that separates data into system 1 data and system 2 data;
a first frequency interleaving unit that frequency interleaves the data of the 1 system;
a second frequency interleaving unit that frequency interleaves the data of the two systems;
with
The transmitting apparatus, wherein the processing in the first frequency interleaving section and the processing in the second frequency interleaving section are related to interleaving processing and deinterleaving processing. In the space division multiplexing MIMO-OFDM transmission device according to claim 1,
The first frequency interleaving section and the second frequency interleaving section are each composed of a memory, and the first frequency interleaving section and the second frequency interleaving section exchange read addresses and write addresses with respect to the memory. A transmitting device characterized by: In a spatial division multiplexing MIMO-OFDM receiver,
a first frequency deinterleaving unit that frequency deinterleaves data of system 1;
a second frequency deinterleaving unit that frequency deinterleaves the data of the second system;
a system synthesis unit that synthesizes the frequency deinterleaved data of the first system and the data of the second system;
with
The receiving apparatus, wherein the processing in the first frequency deinterleaving section and the processing in the second frequency deinterleaving section are related to deinterleaving processing and interleaving processing. In the spatial division multiplexing MIMO-OFDM system receiver according to claim 3,
The first frequency deinterleaving section and the second frequency deinterleaving section are each composed of a memory, and the first frequency deinterleaving section and the second frequency deinterleaving section provide read addresses and write addresses to the memory. Receiving apparatus characterized in that they are exchanged with each other. In a space division multiplexing MIMO-OFDM transmission/reception system,
Data is separated into 1-system data and 2-system data for transmission and reception, and in the frequency interleaving of data on the transmitting side and the frequency de-interleaving of data on the receiving side, the 1-system processing and the 2-system processing are performed respectively. act independently,
The 2-system frequency interleaver on the transmitting side performs frequency deinterleaving processing performed by the 1-system frequency deinterleaver, and the 2-system frequency deinterleaver on the receiving side performs the frequency interleaving processing performed by the 1-system frequency interleaver. A transmission/reception system characterized by performing A chip mounted in a transmitter or receiver of a space division multiplexing MIMO-OFDM system, comprising an interleaver that performs frequency interleaving on one series of data, and an interleaver that performs frequency interleaving on the other series of data. A deinterleaver that performs frequency deinterleaving, which is reverse processing ,
When installed in a transmission device, data of system 1 and data of system 2 are input, and frequency interleaving of data of system 1 and frequency interleaving of data of system 2 are performed by interleaving and deinterleaving. It becomes a relationship of processing,
When mounted on a receiving device, system 1 data and system 2 data that are systematically combined after frequency deinterleaving processing in the chip are input, frequency deinterleaving for system 1 data and frequency for system 2 data. A chip in which de-interleaving is related to interleaving and de-interleaving .

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