Method and system of iterative coding/decoding of digital data streams coded by spatio-temporal combinations, in multiple transmission and reception
First Claim
1. Method of coding a digital data stream coded by spatio-temporal combinations in multiple transmission and reception, wherein the method consists, on the basis of an initial digital data stream:
- in subjecting said initial digital data stream to an outer coding by means of a first code of specified rate, so as to generate a coded digital stream;
in subjecting said coded digital stream, subdivided into successive blocks, to a blockwise interleaving process so as to generate a coded digital stream;
in subjecting said coded and interleaved digital stream to a demultiplexing, said coded and interleaved digital stream being thus subdivided into a number v of elementary interleaved coded digital streams;
in subjecting each elementary interleaved coded digital stream to an inner coding by means of at least one second code of specified rate so as to generate a set of elementary digital streams, coded by spatio-temporal combinations;
in transmitting each elementary digital stream consisting of symbols over a transmission channel by means of a distinct transmission antenna, the set of said transmission antennas forming a space-diversity array, so as to generate a set of transmitted elementary digital streams exhibiting spatial and temporal diversity, thereby making it possible, on reception, to perform a decoding of the digital data stream coded by spatio-temporal combinations and consisting of said set of transmitted elementary digital streams, on the basis of a priori information representative of the spatial and temporal diversity;
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Abstract
The invention relates to a method of coding and of decoding a digital data stream coded by spatio-temporal combinations, in multiple transmission and reception.
On transmission, the initial stream (IDS) is subjected to an outer coding (A), a blockwise interleaving (B), a demultiplexing (C) over a plurality of pathways, to an inner coding Ξm on each pathway, then transmitted on a plurality (ν) of distinct antennas forming a space-diversity array. On reception, the coded symbol streams transmitted are observed (F) by means of a number ν of reception antennas which is independent of the number of transmission antennas, the observed coded symbol streams
are subjected to a process of turbo-detection by equalization and joint decoding (G), deinterleaving (H), outer decoding (I), interleaving (J), so as to generate an a priori information item (api) on the coded bits, which is reinjected (K) into the turbo-detection process.
Application to the implementation of a universal radiofrequency interface, in particular for mobile radio telephony.
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Citations
12 Claims
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1. Method of coding a digital data stream coded by spatio-temporal combinations in multiple transmission and reception, wherein the method consists, on the basis of an initial digital data stream:
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in subjecting said initial digital data stream to an outer coding by means of a first code of specified rate, so as to generate a coded digital stream;
in subjecting said coded digital stream, subdivided into successive blocks, to a blockwise interleaving process so as to generate a coded digital stream;
in subjecting said coded and interleaved digital stream to a demultiplexing, said coded and interleaved digital stream being thus subdivided into a number v of elementary interleaved coded digital streams;
in subjecting each elementary interleaved coded digital stream to an inner coding by means of at least one second code of specified rate so as to generate a set of elementary digital streams, coded by spatio-temporal combinations;
in transmitting each elementary digital stream consisting of symbols over a transmission channel by means of a distinct transmission antenna, the set of said transmission antennas forming a space-diversity array, so as to generate a set of transmitted elementary digital streams exhibiting spatial and temporal diversity, thereby making it possible, on reception, to perform a decoding of the digital data stream coded by spatio-temporal combinations and consisting of said set of transmitted elementary digital streams, on the basis of a priori information representative of the spatial and temporal diversity;
- View Dependent Claims (2, 3, 4)
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5. Method of decoding a digital data stream coded by spatio-temporal combinations in multiple transmission and reception, this coded digital data stream consisting at least of a set of elementary digital streams obtained by a first outer coding of an initial digital data stream by means of a first code of specified rate, blockwise interleaving of the coded digital stream emanating from this first outer coding, temporal demultiplexing of the coded and interleaved digital stream obtained on a specified number | of demultiplexing pathways, this coded and interleaved digital stream being thus subdivided into one and the same number ν
- of elementary coded and interleaved digital streams, subjecting each elementary coded and interleaved digital stream to a second inner coding by means of at least one second code of specified rate so as to generate said set of elementary digital streams, coded by spatio-temporal combinations, transmission of each elementary digital stream consisting of symbols by means of a distinct transmission antenna, the set of the transmission antennas forming an array of space-diversity transmission antennas, wherein said decoding method consists;
in receiving said digital data stream coded by spatio-temporal combinations and consisting of said set of elementary digital streams transmitted over a transmission channel on a plurality of reception antennas, the number of said reception antennas being independent of the number ν
of transmission antennas and forming an array of space-diversity reception antennas so as to define a set of elementary streams of modulation symbols received;
in subjecting said set of elementary streams of modulation symbols received to an iterative process of equalization of the transmission channel and of joint decoding, by means of said second inner coding on the basis of an extrinsic information stream on the bits coded by the first outer code and interleaved and emanating from a decoding on the basis of said outer code, said extrinsic information stream on the bits coded by the first outer code and interleaved constituting an a priori information item, so as to generate a first extrinsic information stream on the bits coded by the first outer code and interleaved;
in subjecting said first extrinsic information stream to a deinterleaving so as to generate a second extrinsic information stream on the coded bits originating from the equalization and joint decoding process;
in subjecting said second extrinsic information stream on the coded bits to a decoding on the basis of said first outer code, so as to generate a third extrinsic information stream on the coded bits, and emanating from the decoding on the basis of said first outer code;
in subjecting said third extrinsic information stream to an interleaving, so as to generate said extrinsic information stream on the bits coded by the first outer code and interleaved, constituting said a priori information item;
in reinjecting said a priori information item into the iterative process for equalization of the transmission channel and joint decoding. - View Dependent Claims (6, 7)
- of elementary coded and interleaved digital streams, subjecting each elementary coded and interleaved digital stream to a second inner coding by means of at least one second code of specified rate so as to generate said set of elementary digital streams, coded by spatio-temporal combinations, transmission of each elementary digital stream consisting of symbols by means of a distinct transmission antenna, the set of the transmission antennas forming an array of space-diversity transmission antennas, wherein said decoding method consists;
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8. System for coding a digital data stream coded by spatio-temporal combinations in multiple transmission and reception, this system comprising at least:
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means of outer coding of an initial digital data stream, on the basis of a first code of specified rate, so as to generate a coded digital stream, subdivided into successive blocks;
means of blockwise interleaving making it possible, on the basis of said coded digital stream, to generate an interleaved coded digital stream exhibiting temporal diversity;
demultiplexer means receiving said interleaved coded digital stream, making it possible to generate a number ν
of elementary interleaved coded digital streams;
a plurality of means of inner coding on the basis of at least one second code of specified rate, each means of inner coding receiving one of said elementary interleaved coded digital streams, so as to generate a set of elementary digital streams, coded by spatio-temporal combinations and consisting of symbols;
a plurality of transmission antennas for each elementary digital stream coded by spatio-temporal combinations and consisting of symbols, a distinct transmission antenna achieving the transmission of an elementary digital stream, the set of said transmission antennas forming a space-diversity array, said system making it possible to generate a set of transmitted elementary digital streams exhibiting spatial and temporal diversity, thereby making it possible, on reception, to perform a decoding of the transmitted elementary digital streams on the basis of a priori information representative of the spatial and temporal diversity. - View Dependent Claims (9)
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10. System for decoding a digital data stream coded by spatio-temporal combination in multiple transmission and reception, this coded digital data stream consisting at least of a set of transmitted elementary digital streams obtained by a first outer coding of an initial digital data stream by means of a first code of specified rate, blockwise interleaving of the coded digital stream emanating from this first outer coding, temporal demultiplexing of the coded and interleaved digital stream obtained on a specified number v of demultiplexing pathways, this coded and interleaved digital stream being thus subdivided into one and the same number ν
- of elementary coded and interleaved digital streams, subjecting each elementary coded and interleaved digital stream to a second inner coding by means of at least one second code of specified rate so as to generate this set of elementary digital streams, coded by spatio-temporal combinations, transmission of each elementary digital stream subdivided into symbols by means of a distinct transmission antenna according to a set of elementary streams transmitted over a transmission channel, the set of the transmission antennas forming an array of space-diversity transmission antennas, this decoding system comprising;
a plurality of reception antennas making it possible to receive said set of elementary digital streams transmitted over this transmission channel, the number of said reception antennas being independent of the number v of transmission antennas and forming an array of space-diversity reception antennas, so as to define a set of elementary streams of modulation symbols received;
means of turbo-detection of said elementary streams of modulation symbols received by iterative equalization and iterative joint detection and iterative decoding, said turbo-detection means comprising;
means of equalization of the transmission channel and of joint decoding, by means of said second inner coding on the basis of an extrinsic information stream on the bits coded by the first outer code and interleaved and which arises from a decoding on the basis of said outer code, said extrinsic information stream on said bits coded by the first outer code and interleaved constituting an a priori information item, said means of equalization of the transmission channel and of joint decoding making it possible, on the basis of said elementary streams of modulation symbols received, to generate a first extrinsic information stream on the bits coded by the first outer code and interleaved;
means of deinterleaving said first extrinsic information stream, so as to generate a second extrinsic information stream on the coded bits originating from the means of equalization and of joint decoding;
means of decoding on the basis of said first outer code receiving said second extrinsic information stream and making it possible to generate a third extrinsic information stream on the coded bits, which arises from the decoding on the basis of said first outer code;
means of interleaving said third extrinsic information stream, so as to generate said extrinsic information stream on the bits coded by the first outer code and interleaved, constituting said a priori information item reinjected into said means of equalization of the transmission channel and of joint decoding. - View Dependent Claims (11, 12)
- of elementary coded and interleaved digital streams, subjecting each elementary coded and interleaved digital stream to a second inner coding by means of at least one second code of specified rate so as to generate this set of elementary digital streams, coded by spatio-temporal combinations, transmission of each elementary digital stream subdivided into symbols by means of a distinct transmission antenna according to a set of elementary streams transmitted over a transmission channel, the set of the transmission antennas forming an array of space-diversity transmission antennas, this decoding system comprising;
Specification