Method of coding/decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception in the presence of intersymbol interference and corresponding system
First Claim
1. A method of decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception on a transmission channel which creates intersymbol interference, the digital data stream coded with interleaving comprising a set of transmitted elementary digital streams obtained from an initial digital data stream subjected to:
- an outer coding by means of a code of specified rate, so as to generate a coded digital stream,an interleaving at bit level of this coded digital stream so as to generate an interleaved coded digital stream,a layer demultiplexing of this interleaved coded digital stream on a specified number ν
of demultiplexed pathways, so as to generate a corresponding number of layers of interleaved coded digital stream,converting each digital modulation string consisting of qm successive bits of one and the same layer into a Qm-ary symbol, Qm=2qm, according to a specific mapping scheme,transmitting each Qm-ary symbol by means of a distinct transmission antenna, the set of these antennas forming a space-diversity array, making it possible to generate this set of transmitted elementary digital streams,wherein said method further comprises the steps of;
receiving, on a plurality p of reception antennas, said digital data stream coded with bitwise interleaving in multiple transmission and reception consisting of said set of elementary digital streams transmitted on this transmission channel, there being a number p of said reception antennas, which number is independent of the number ν
of transmission antennas and said reception antennas forming an array of space-diversity reception antennas so as to define a set of elementary streams of modulation symbols received;
subjecting said set of elementary streams of modulation symbols received to an iterative process of equalization of the transmission channel and of joint multilayer detection by means of an extrinsic information stream on the bits coded by said outer code and interleaved, said extrinsic information stream constituting an a priori information item, so as to generate a first extrinsic information stream on the bits coded by the outer code and interleaved;
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 process;
subjecting said second extrinsic information stream on the coded bits to a decoding on the basis of said outer code, so as to generate a third extrinsic information stream on the coded bits, which stream arises from the decoding on the basis of said outer code;
subjecting said third extrinsic information stream to an interleaving, so as to generate said extrinsic information stream on the bits coded by said outer code and interleaved constituting said a priori information item;
reinjecting said a priori information item into the iterative process of equalization of the transmission channel and ofjoint multilayer detection.
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Abstract
Method and system for coding/decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception for a radio interface, in which the coding includes subjecting an initial digital data stream to an outer coding, an interleaving, a layer demultiplexing on multiple pathways, converting by modulation successive bits of each layer into Qm-ary symbol then transmitting each symbol by means of a transmission antenna of an array of antennas and the decoding includes receiving the digital data stream transmitted on multiple r reception antennas forming an array, subjecting the set of symbols received to an iterative process of equalization and joint multilayer detection, on the basis of an a priori information item, subjecting the first extrinsic information stream obtained to a deinterleaving, subjecting a second extrinsic information stream obtained to an outer decoding and a third extrinsic information stream obtained to an interleaving so as to generate the a priori information item and reinjecting the latter into the process.
42 Citations
11 Claims
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1. A method of decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception on a transmission channel which creates intersymbol interference, the digital data stream coded with interleaving comprising a set of transmitted elementary digital streams obtained from an initial digital data stream subjected to:
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an outer coding by means of a code of specified rate, so as to generate a coded digital stream, an interleaving at bit level of this coded digital stream so as to generate an interleaved coded digital stream, a layer demultiplexing of this interleaved coded digital stream on a specified number ν
of demultiplexed pathways, so as to generate a corresponding number of layers of interleaved coded digital stream,converting each digital modulation string consisting of qm successive bits of one and the same layer into a Qm-ary symbol, Qm=2qm, according to a specific mapping scheme, transmitting each Qm-ary symbol by means of a distinct transmission antenna, the set of these antennas forming a space-diversity array, making it possible to generate this set of transmitted elementary digital streams, wherein said method further comprises the steps of; receiving, on a plurality p of reception antennas, said digital data stream coded with bitwise interleaving in multiple transmission and reception consisting of said set of elementary digital streams transmitted on this transmission channel, there being a number p of said reception antennas, which number is independent of the number ν
of transmission antennas and said reception antennas forming an array of space-diversity reception antennas so as to define a set of elementary streams of modulation symbols received;subjecting said set of elementary streams of modulation symbols received to an iterative process of equalization of the transmission channel and of joint multilayer detection by means of an extrinsic information stream on the bits coded by said outer code and interleaved, said extrinsic information stream constituting an a priori information item, so as to generate a first extrinsic information stream on the bits coded by the outer code and interleaved; 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 process; subjecting said second extrinsic information stream on the coded bits to a decoding on the basis of said outer code, so as to generate a third extrinsic information stream on the coded bits, which stream arises from the decoding on the basis of said outer code; subjecting said third extrinsic information stream to an interleaving, so as to generate said extrinsic information stream on the bits coded by said outer code and interleaved constituting said a priori information item; reinjecting said a priori information item into the iterative process of equalization of the transmission channel and ofjoint multilayer detection. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception on a transmission channel which creates intersymbol interference, the digital data stream coded with interleaving comprising a digital data set subjected to:
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an outer coding by means of a code of specified rate, so as to generate an interleaved coded digital stream, a layer demultiplexing of the interleaved coded digital stream on a specified number ν
of demultiplexed pathways, so as to generate a corresponding number of layers of interleaved coded digital stream,a conversion of each digital modulation string comprising qm successive bits of one and the same layer into a Qm-ary symbol, Qm=2qm, according to a specific mapping scheme, a transmission of each Qm-ary symbol by means of a distinct transmission antenna, the set of these antennas forming a space-diversity array, making it possible to generate this set of transmitted elementary digital streams, wherein said decoding device comprises; a plurality p of reception antennas making it possible to receive said digital data stream coded with bitwise interleaving in multiple transmission and reception comprising said set of elementary digital streams transmitted on the transmission channel, there being a number ρ
of said reception antennas, which number is independent of the number ν
of transmission antennas and said reception antennas forming an array of space-diversity reception antennas so as to define a set of elementary streams of modulation symbols received;turbodetection means making it possible to subject said set of elementary streams of modulation symbols received to an iterative process of equalization of the transmission channel and ofjoint multilayer detection by means of an extrinsic information stream on the bits coded by said outer code and interleaved, said extrinsic information stream constituting an a priori information item, so as to generate a first extrinsic information stream on the bits coded by the outer code and interleaved; deinterleaving means receiving said first extrinsic information stream and making it possible, by deinterleaving the latter, to generate a second extrinsic information stream on the coded bits originating from the equalization process; decoder means receiving said second extrinsic information stream on the coded bits and making it possible, by decoding the latter, on the basis of said outer code, to generate a third extrinsic information stream on the coded bits, which stream arises from the decoding on the basis of said outer code; interleaving means receiving said third extrinsic information stream and making it possible, by interleaving, to generate said extrinsic information stream on the bits coded by said outer code and interleaved constituting said a priori information item; means of reinjection of said a priori information item into the iterative process of equalization of the transmission channel and ofjoint multilayer detection. - View Dependent Claims (8, 9, 10, 11)
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Specification