KR20080090706A - Method for signal transmitting and apparatus for the same, method for signal receiving and apparatus for the same - Google Patents
Method for signal transmitting and apparatus for the same, method for signal receiving and apparatus for the same Download PDFInfo
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- KR20080090706A KR20080090706A KR1020070033863A KR20070033863A KR20080090706A KR 20080090706 A KR20080090706 A KR 20080090706A KR 1020070033863 A KR1020070033863 A KR 1020070033863A KR 20070033863 A KR20070033863 A KR 20070033863A KR 20080090706 A KR20080090706 A KR 20080090706A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/068—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using space frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
- H04L1/0065—Serial concatenated codes
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
Description
1 is a block diagram schematically showing an apparatus for transmitting a signal as an embodiment according to the present invention;
2 is a block diagram schematically showing a linear precoding unit according to an embodiment of the present invention.
3 (a) is a diagram illustrating a matrix of codes for distributing input data according to an embodiment of the present invention.
3 (b) is a diagram illustrating another code matrix for distributing input data according to an embodiment of the present invention.
4 is a block diagram schematically illustrating a case in which a signal transmission apparatus has a plurality of transmission paths according to an embodiment of the present invention.
5A to 5E illustrate an example of a 2 × 2 code matrix for distributing input symbols according to an embodiment of the present invention.
6 is a block diagram schematically illustrating an apparatus for receiving a signal according to an embodiment of the present invention.
7 (a) is a block diagram schematically showing an example of a linear precoding decoder as an embodiment according to the present invention.
7 (b) is a block diagram schematically illustrating another example of a linear precoding decoder according to an embodiment of the present invention.
8 is a block diagram schematically illustrating a case in which a signal receiving apparatus has a plurality of receiving paths according to an embodiment of the present invention.
9 (a) to 9 (e) illustrate an example of a 2 × 2 code matrix for reconstructing distributed symbols as an embodiment according to the present invention.
10 is a flowchart illustrating a signal transmission / reception method according to an embodiment of the present invention.
* Explanation of symbols for the main parts of the drawings
100: outer coder 110: outer interleaver
120: inner coder 130: inner interleaver
140: symbol mapper 150: block selection unit
160: linear precoding unit 170: multiple input and output encoder
180: frame forming unit 190: SC modulator
195: transmission unit
The present invention relates to a signal transmission and reception method and a signal transmission and reception apparatus, and more particularly, to a signal transmission and reception method and a transmission and reception apparatus that is robust to time selective fading.
As technology advances, the size of data desired by a user is gradually increasing, but there is a certain limit to the expansion of a transmission resource for transmitting the data to the user. Therefore, various techniques have been developed to improve the transmission efficiency of data using finite transmission resources.
Among the above techniques, there is a multiple input / output (MIMO: Multi Input Multi Output) scheme in which a plurality of transmission / reception antennas are used to increase data transmission efficiency.
The transmission / reception system using a single carrier (SC) has a peak-to-average power ratio in the time domain compared to a system using multiple carriers such as orthogonal frequency division multiplexing (OFDM). Since the ratio (PAPR) is low, it is efficient in terms of transmission power.
However, in a transmission channel that suffers from the Doppler effect, time selective fading occurs in the time domain, and size distortion in the time domain becomes very severe according to the moving speed of the receiver. Therefore, the signal-to-noise ratio (SNR) for each time domain is changed, and the reception rate is reduced in the time domain where the SNR is very low.
In the case of using the multiple input / output scheme, the array gain can be obtained by using multiple antennas to improve the average SNR, and the fading of the transmission channel from each transmitting antenna to each receiving antenna is independent. Diversity gain can be obtained.
However, in the case of the multi-input / output method, when only one specific transmission channel is considered, there is a problem that it is still forced to undergo time-selective fading.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a signal transmission and reception method and a transmission and reception apparatus that are robust against time selective fading.
According to an aspect of the present invention, there is provided a signal transmission apparatus comprising: a symbol mapper for mapping input data to symbol data according to a corresponding transmission scheme, and data farther from a coherence time in the symbol data; A block selector for selecting and outputting a signal, a precoding unit for coding and outputting the selected symbol data to be distributed over at least two symbol data in a time domain, and a multiple input / output encoder for encoding the precoded data to be transmitted in multiplexes It includes.
In the signal transmission method according to the present invention, selecting and outputting data farther than a coherence time among symbol data mapped according to a corresponding transmission method, and outputting the selected symbol data to at least two symbols in a time domain Coding and outputting the data to be distributed to the data, and performing multiple input / output encoding so that the coded data can be transmitted in multiplex.
In accordance with another aspect of the present invention, a signal receiving apparatus includes: a multiple input / output decoder for decoding a plurality of received data and outputting one symbol data string, and a precoding for restoring and outputting data distributed in a time domain from the output symbol data string A decoder, a block reconstruction unit for returning the recovered symbol data to an original position farther than a coherence time, and a symbol demapper for demapping the symbol data returned to the original position and outputting bit data corresponding to the symbol do.
The signal receiving method according to the present invention comprises the steps of: outputting a single symbol data string by multiple input / output decoding of multiplely received data, decoding the output symbol data, restoring data distributed in a time domain; Returning the recovered symbol data to an original position farther than a coherence time, and demapping the returned symbol data.
Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.
In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the corresponding description of the invention, It is to be clear that the present invention is to be understood as the meaning of terms rather than names.
Operation of the signal transmission and reception method and the signal transmission and reception device according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.
1 is a block diagram schematically showing a signal transmission apparatus according to an embodiment according to the present invention. The transmission and reception system uses MIMO (Multi Input Multi Output) for multiple input and output.
The signal transmission apparatus of FIG. 1 transmits a signal using a single carrier (SC). When the signal transmission apparatus transmits video data such as a broadcast signal, the apparatus may be a broadcast signal transmission system. An embodiment of a signal transmission system according to the present invention will be described with reference to FIG. 1.
1 illustrates an
The
The
The
The
The
2 is a block diagram schematically showing a linear precoding unit according to an embodiment of the present invention. The
The serial /
3A is a diagram illustrating a matrix of codes for distributing input data according to an embodiment of the present invention. 3 (a) is called a vanderMonde matrix as an example of an encoding matrix for distributing the input data into a plurality of output data. The input data may be arranged in parallel in the length (L) of the output data.
Θ of the matrix may be expressed by the following equation, and may be defined in other ways. The vanderMonde matrix may adjust its matrix component by
The matrix rotates each input data by the phase of the
In
3 (b) is a diagram illustrating another code matrix for distributing input data according to an embodiment of the present invention. 3 (b) is called an Hadamard matrix as an example of an encoding matrix for distributing the input data into a plurality of output data. The matrix of FIG. 3 (b) is a general form extended to a size of any L = 2 k , and 'L' represents the number of output symbols to distribute each input symbol.
The output symbols of the matrix can be obtained by the sum and difference of the L input symbols. In other words, each input symbol can be spread over L output symbols.
Also in the case of the matrix of FIG. 3B, the input data group input to the
The parallel /
The multiple input /
There are two types of multiple input / output encoding methods, spatial multiplexing and spatial diversity. Spatial multiplexing is a method in which multiple antennas are transmitted to a transmitter and a receiver to transmit different data at the same time, thereby transmitting data at higher speed without further increasing the bandwidth of the system. Spatial diversity is a method of obtaining transmit diversity by transmitting data of the same information from multiple transmit antennas.
In this case, as the multiple diversity input /
The
The SC (Single Carrier)
4 is a block diagram schematically illustrating a case in which a signal transmission apparatus has a plurality of transmission paths according to an embodiment of the present invention. For convenience of explanation, the following description will be given by using two transmission paths as an example.
The embodiment of FIG. 4 includes an
Signal processing from the
The
The inner coder and the inner interleaver perform interleaving by recoding a signal to be transmitted in preparation for an error in the transmission signal.
In an example of the VSB scheme, the inner interleaving is performed in a trellis coder in combination with an inner coder in the form of virtual interleaving. Therefore, when inner coding and inner interleaving are performed together in a trellis encoder as in the VSB scheme, which is an example of the single transmission carrier system, an inner coding and interleaving unit including an inner coder and an inner interleaver as one block as shown in FIG. 420.
However, in the case of another single transmission carrier system in which inner coding and inner interleaving are performed separately, the inner coder and the inner interleaver may be illustrated as separate blocks as shown in FIG. 1. That is, this may vary depending on the example of the transmission and reception system to be applied.
The
The
The
The
5A to 5E illustrate an example of a 2 × 2 code matrix for distributing input symbols according to an embodiment of the present invention. The code matrixes of FIGS. 5A to 5E may be applied to the transmitting apparatus as shown in FIG. 4, and two data input to the encoding unit of the
The matrix of FIG. 5A is an embodiment of the vanderMonde matrix described with reference to FIG. 3A.
The matrix of FIG. 5 (a) is 45 degrees out of phase with the first of the two input data.
) Adds the second rotated input data and outputs it as the first output data. The phase is 225 degrees with the first input data. ) Add the rotated second input data and output it as the second output data. And each output data Scaling by dividing by.The matrix of FIG. 5 (b) is an embodiment of the Hadamard matrix described in FIG. 3 (b).
The matrix of FIG. 5 (b) adds the first input data and the second input data among the two input data and outputs the first output data. The second input data is subtracted from the first input data and output as the second output data. And each output data
Scaling by dividing by.FIG. 5C is a diagram illustrating another example of a code matrix for distributing an input symbol applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5C is an embodiment of another code other than the matrix described with reference to FIGS. 3A and 3B.
In the matrix of FIG. 5C, the phase of the two input data is 45 degrees (
) The first input data rotated and the phase is -45 degrees ( The second input data rotated is added to the first output data, and the second input data rotated by -45 degrees is subtracted from the first input data rotated by 45 degrees to output the second output data. And each output data Divide by to scale.FIG. 5 (d) is a diagram illustrating another example of a code matrix for distributing input symbols applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5D is another embodiment of the code other than the matrix described with reference to FIGS. 3A and 3B.
The matrix of FIG. 5 (d) adds the first input data multiplied by 0.5 to the second input data and outputs the first output data, and subtracts the second input data multiplied by 0.5 from the first input data and outputs the second output data. And each output data
Divide by to scale.FIG. 5E illustrates another example of a code matrix for distributing input symbols applicable to FIG. 4 according to an embodiment of the present invention. The matrix of FIG. 5E is another embodiment of the code other than the matrix described with reference to FIGS. 3A and 3B. '*' In FIG. 5 (e) means a complex conjugate with respect to input data.
The matrix of FIG. 5E has a phase of 90 degrees between two input data.
) The first input data and the second input data rotated are added to output the first output data. The complex number and phase of the first input data are -90 ( ) Also outputs the second output data by adding the complex conjugate of the rotated second input data. And each output data Divide by to scale.The precoded data is output to the multiple input /
In the case of the spatial diversity method, data of the same information is output to the first
The first
The
The
6 is a block diagram schematically illustrating an apparatus for receiving a signal according to an embodiment of the present invention. The embodiment of FIG. 6 may be included in a broadcast receiving device.
6, the
The
The SC demodulator 620 demodulates the received data output from the
The
The multiple input /
The
7A is a block diagram schematically illustrating an example of a linear precoding decoder according to an embodiment of the present invention. The
The serial /
The parallel /
FIG. 7B is a block diagram schematically showing another example of a linear precoding decoder according to an embodiment of the present invention. The
The serial /
The
The
The symbol demapper 670 demaps the symbol data restored to the original position by the
An
8 is a block diagram schematically illustrating a case where a signal receiving apparatus has a plurality of receiving paths according to an embodiment of the present invention. For convenience of explanation, the following description will be given by using two reception paths as an example.
8, the
The
The
Each of the
The multiple input /
Hereinafter, the signal processing from the multiple input /
The
9 (a) to 9 (e) illustrate an example of a 2 × 2 code matrix for reconstructing distributed symbols according to an embodiment of the present invention. The code matrixes of FIGS. 9 (a) to 9 (e) may be applied to a receiving apparatus as shown in FIG. 8 and recover data distributed to two data input to a decoding unit of the
The matrix of FIG. 9 (a) is an embodiment of the vanderMonde inverse matrix and is a decoding matrix corresponding to the encoding matrix of FIG. 5 (a).
The matrix of FIG. 9 (a) adds the first input data and the second input data among the two input data and outputs the first output data, and has a phase of −45 degrees (
) The first input data rotated and the phase is -225 degrees ( ) Add the rotated second input data and output it as the second output data. And each output data Divide by to scale.The matrix of FIG. 9 (b) is an embodiment of the Hadamard inverse matrix and is a decoding matrix corresponding to the encoding matrix of FIG. 5 (b).
The matrix of FIG. 9 (b) adds first input data and second input data among two input data and outputs the first output data, and subtracts the second input data from the first input data and outputs the second output data. And each output data
Scaling by dividing by.FIG. 9 (c) is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9C is a decoding matrix corresponding to the encoding matrix of FIG. 5C.
9 (c) has a phase of -45 degrees between two input data.
) The first input data rotated and the phase is -45 degrees ( The second input data rotated is added to the first output data, and the second input data rotated by 45 degrees is subtracted from the first input data rotated by 45 degrees to output the second output data. And each output data Divide by to scale.9 (d) is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9 (d) is a decoding matrix corresponding to the encoding matrix of FIG. 5 (d).
The matrix of FIG. 9 (d) adds first input data multiplied by 0.5 to second input data and outputs the first output data, and subtracts second input data multiplied by 0.5 from the first input data and outputs the second output data. And each output data
Divide by to scale.FIG. 9E is a diagram illustrating another example of a code matrix for restoring distributed data applicable to FIG. 8 according to an embodiment of the present invention. The matrix of FIG. 9E is a decoding matrix corresponding to the encoding matrix of FIG. 5E. '*' In FIG. 9 (e) denotes a complex conjugate with respect to input data.
The matrix of FIG. 9 (e) has a phase of −90 degrees (
The first input data is rotated and the complex of the second input data is added to output the first output data. The first input data and the phase are -90 degrees ( ) Adds the complex conjugate of the rotated second input data and outputs it as the second output data. And each output data Divide by to scale.The
The inner deinterleaving &
When inner coding and inner interleaving are performed together in the trellis encoder as in the VSB method, which is an example of a single transmission carrier system, the inner coder and the inner interleaver may be illustrated as an inner coding and
However, in the case of another single transmission carrier system in which inner deinterleaving and inner decoding are performed separately, the inner deinterleaver and the inner decoder may be illustrated as separate blocks as shown in FIG. 6. That is, this may vary depending on the example of the transmission and reception system to be applied.
In addition, the
10 is a flowchart illustrating a signal transmission / reception method according to an embodiment of the present invention.
The signal transmission apparatus selects a transmission symbol that is farther than the coherence time of the channel among the mapped symbol data (S1000) to reduce the probability that all data within the time due to deep fading is lost. The selection distance may vary depending on implementation.
Precoding is performed to distribute the selected symbol data to a plurality of output symbols in the time domain (S1010), so that the transmission data is robust to time selective fading.
The pre-coded data is multi-input / output encoded so that a plurality of antennas can be transmitted (S1020). The number of antennas can be the number of possible data transmission paths. In the case of the spatial diversity method, data of the same information is transmitted in each path, and in the case of the spatial multiplexing method, different data is transmitted in each path.
In operation S1030, the encoded data is converted into a transmission frame, modulated, and transmitted according to the number of the multi-input / output transmission paths.
The signal receiving apparatus receives the transmitted signal using the plurality of receiving antennas, and demodulates the received signal into data frames (S1040).
The demodulated data frame is parsed and decoded according to a scheme corresponding to a multiple input / output encoded scheme to obtain one symbol data string (S1050).
The output data stream is decoded in the inverse of the method precoded by the transmitting device to restore original data distributed to a plurality of symbol data in the time domain (S1060).
The restored symbol data is restored to an original position farther than the coherence time (S1070). The symbol data may be restored to its original position by performing a reverse process of selecting a transmission symbol in S1000.
The signal transceiving method and the signal transceiving apparatus are not limited to the above examples, and may be applied to all signal transceiving systems to which a multi-input / output method is applied.
The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.
As described above, according to the signal transmission and reception method and the signal transmission and reception apparatus of the present invention, the input data is distributed and transmitted in the time domain, thereby making it more robust to time selective fading of each transmission channel, thereby improving signal reception performance of the receiver.
Claims (17)
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KR1020070033863A KR20080090706A (en) | 2007-04-05 | 2007-04-05 | Method for signal transmitting and apparatus for the same, method for signal receiving and apparatus for the same |
PCT/KR2008/001936 WO2008123715A1 (en) | 2007-04-05 | 2008-04-04 | Method for signal transmitting and apparatus for the same, method for signal receiving and apparatus for the same |
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KR1020070033863A KR20080090706A (en) | 2007-04-05 | 2007-04-05 | Method for signal transmitting and apparatus for the same, method for signal receiving and apparatus for the same |
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CN1883151B (en) * | 2003-09-15 | 2010-06-16 | 英特尔公司 | Multicarrier transmitter, multicarrier receiver, and methods for communicating multiple spatial signal streams |
US9385843B2 (en) * | 2004-12-22 | 2016-07-05 | Qualcomm Incorporated | Method and apparatus for using multiple modulation schemes for a single packet |
US7474640B2 (en) * | 2005-09-28 | 2009-01-06 | Intel Corporation | System, method and device of interference mitigation in wireless communication |
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