CN101572685A - Transmission device used for orthogonal frequency-division multiplexing system - Google Patents
Transmission device used for orthogonal frequency-division multiplexing system Download PDFInfo
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Abstract
The invention discloses a transmission device used for an orthogonal frequency-division multiplexing system, comprising a code layer mapping unit, a coding modulation unit, a flow mapping unit, a multi-input multi-output processing unit and a source mapping unit, wherein the code layer mapping unit divides a transmitted transmission block into a common data packet and a reinforced data packet, divides the common data packet and then divides the reinforced data packet; the coding modulation unit is used for carrying out coding modulation processing to every division result of the common data packet and every division result of the reinforced data packet; the flow mapping unit is used for regrouping every coding modulation result of the common data packet and every coding modulation result of the reinforced data packet; the multi-input multi-output processing unit is used for carrying out multi-input multi-output processing to every coding modulation result of the common data packet after being regrouped and every coding modulation result of the reinforced data packet after being regrouped; and the source mapping unit is used for inserting pilot frequency into every multi-input multi-output processing result of the common data packet and every multi-input multi-output processing result of the reinforced data packet according to a preset pilot frequency pattern and transmitting the multi-input multi-output processing results by a subcarrier source.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of emitter that is used for ofdm system.
Background technology
Along with developing rapidly of two-forty, reliable service demand, increasing technology has been incorporated into the wireless communication technique field, goes out (MIMO), OFDM (OFDM) technology as the many inputs majority as the key technology of 4G.Physical layer is after adding MIMO, and particularly along with the development of MIMO technology, the distortion of various MIMO has caused the variation of physical layer architecture.
At present, as shown in Figure 1 based on the transmitter architecture among the IEEE 802.16e of OFDM technology.In transmitter architecture shown in Figure 1, at first the data block of input is done randomization by the randomization unit, carry out coding debug, sign map then.Wherein, the MIMO of the mapping be encoded to to(for) spatial reuse of Space Time Coding (STC) module is carried out according to space encoding type (as level code, vertical coding).For level code, its situation is similar to LTE (seeing the analysis of LTE); For vertical coding, if its existence only one deck have mistake, the situation that then whole encoding block need retransmit.
For example, when code rate is 2, adopt
Be characterized in that in code rate be at 2 o'clock, an encoding block is only arranged, control signaling and expense are smaller, and its shortcoming does not have the fine MIMO of utilization when being re-transmission.
For example, in IEEE 802.16e, the pattern of mixed automatic repeat request (HARQ) has 7 kinds.Wherein, 4 kinds is the MIMO pattern, and 3 kinds are and the binding pattern of encoding.A kind of re-transmission mode HARQ-STC in conjunction with many antennas promptly adopts the Space Time Coding steadily increase redundancy to produce, for the first time transmission
Transmit during re-transmission
Twice transmission formed
The prerequisite of carrying out the alamouti decoding is that the requirement channel is to become channel (slow-fading) slowly.In odd number time transmission
Even number time transmission
Can form the STC form adjacent twice.Though utilized the performance of many antennas, but because it only has a coding module to exist, if need to retransmit so have only a stream (be S1, S2 any one) to make mistakes, and another one stream also must retransmit, multiple correct information, influenced the performance that secondary retransmits, resource need reschedule simultaneously, influences the processing time of base station.
Based on the transmitter architecture among the LTE of OFDM technology as shown in Figure 2.In transmitter architecture shown in Figure 2, at first the module scrambling behind the coding is modulated into sequence of complex numbers, modulation symbol is mapped to one or several layer by layer mapping, layer after the mapping is less than or equal to the number of antenna opening, and for encoding block of transmit diversity, hierarchy number equals antenna number; Can maximum equal the antenna port number for the spatial reuse hierarchy number, the output vector that layer shines upon is mapped to antenna opening behind spatial weighting, each antenna resource mapping, the OFDM symbol of generation time domain by precoding.
Be characterized in, can contain one to two encoding block (i.e. two streams) at same time-frequency piece.When two streams, the independent control of each stream to adapt to maximum throughput, is mapped to multiple antenna port when layer shines upon, and promptly the number of plies equals antenna number.Therefore, though in the high level shunting,, system is more flexible, and every stream encryption order of modulation is controlled, supports multi-user's multiple-input and multiple-output (MU-MIMO), and the shortcoming of its existence is that the control expense increases, and retransmit several like this situations that exist when HARQ: 1) double fluid retransmits; 2) go out cross-flow and retransmit another flow transmission new data; 3) go out cross-flow and retransmit, another fluently with the defeated error flow of multi-antenna transmitting, at this moment can have influence on the transmission of former incoming flow, and promptly original stream need stop transmission.
From above description as can be seen, more than two kinds of designs all only limit to diversity or multiplexing multi-antenna structure, the development of many antennas that look to the future may have new distortion.
Should this be to make the design of transmitter have more popularity.
Simultaneously owing to generally adopt the characteristic of subframe to satisfy the delay requirement of system now, RTT is as considering an index of system's time delay, for some fastexts (for example, resource need not to redistribute semi-static business), if directly in physical layer retransmission, can accelerate retransmission delay time.
Summary of the invention
One or more problems in view of the above the invention provides a kind of emitter that is used for ofdm system.
The emitter that is used for ofdm system according to the embodiment of the invention comprises: sign indicating number layer map unit, be used to receive transmission block from media access control layer, transmission block is divided into the general data bag and strengthens packet, and the general data bag is cut apart a plurality of segmentation results that generate the general data bag according to first predetermined length restriction, cut apart and generate a plurality of segmentation results that strengthen packet strengthening packet according to the restriction of second predetermined length; The coded modulation unit is used for respectively each segmentation result of general data bag and each segmentation result of enhancing packet being carried out the coded modulation processing, generates each coded modulation result and each the coded modulation result who strengthens packet of general data bag; The stream map unit is used for the structure according to the multiple-input and multiple-output processing unit, and each coded modulation result of general data bag and each coded modulation result of enhancing packet are recombinated; The multiple-input and multiple-output processing unit, be used for each coded modulation result of the general data bag after recombinating and each coded modulation result of the enhancing packet after the reorganization are carried out the multiple-input and multiple-output processing, generate each multiple-input and multiple-output result and each the multiple-input and multiple-output result that strengthens packet of general data bag; And resource map unit, be used for each multiple-input and multiple-output result of general data bag and each multiple-input and multiple-output result of enhancing packet being mapped to each subcarrier according to the resource allocation principle, according to predetermined pilot tone pattern the pilot tone pattern is mapped on each subcarrier, and by carrying out contrary fast fourier transform formation OFDM symbol, after inserting Cyclic Prefix, launch by antenna element.
Wherein, the restriction of second predetermined length is relevant with the number of antennas and the antenna mode of ofdm system.The multiple-input and multiple-output processing unit is according to the indication of control signaling, and one or more mode combinations in are carried out the multiple-input and multiple-output processing to each coded modulation result of the general data bag after recombinating and each coded modulation result of the enhancing packet after the reorganization in the following manner: Space Time Coding pattern, precoding pattern, wave beam form pattern.Wherein, the equal in length of each segmentation result of general data bag, the equal in length of each segmentation result of enhancing packet.
Wherein, the coded modulation unit comprises: the transmission block verification unit is used for the correctness of verification transmission block; The bit scramble unit is used for each segmentation result of general data bag and each segmentation result of enhancing packet are carried out the scrambling processing, generates each scrambling result and each the scrambling result that strengthens packet of general data bag; Coding processing unit is used for each scrambling result of general data bag and each scrambling result of enhancing packet are carried out encoding process, generates the encoding process result of general data bag and each encoding process result of enhancing packet; The data interlacing unit is used for the encoding process result of general data bag and each encoding process result of enhancing packet are carried out the data interlacing processing, generates each interleaving treatment result and each the interleaving treatment result who strengthens packet of general data bag; And the modulation treatment unit, be used for each interleaving treatment result of general data bag and each interleaving treatment result of enhancing packet are mapped as corresponding complex symbol.Wherein, the transmission block verification unit adopts the mode of cyclic redundancy check (CRC) that transmission block is carried out verification.
In sum, the present invention provides multiple-input and multiple-output support more flexibly by with cutting apart of transmission block of further refinement.In addition, the present invention has adapted to the development trend of different multi-input multi-output systems by original precoding or multiple-input and multiple-output matrix are selected to change the multiple-input and multiple-output processing unit into.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the transmitter architecture schematic diagram among the IEEE 802.16e;
Fig. 2 is the transmitter architecture schematic diagram among the LTE; And
Fig. 3 is the transmitter architecture schematic diagram according to the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Fig. 3 is the transmitter architecture schematic diagram according to the embodiment of the invention.As shown in Figure 3, this transmitter (being emitter) comprising:
Sign indicating number layer map unit, be used for receiving transmission block from medium access control (MAC) layer, transmission block is divided into the general data bag and strengthens packet, and the general data bag is cut apart a plurality of segmentation results that generate the general data bag according to first predetermined length restriction, cut apart and generate a plurality of segmentation results that strengthen packet strengthening packet according to the restriction of second predetermined length;
The coded modulation unit is used for respectively each segmentation result of general data bag and each segmentation result of enhancing packet being carried out the coded modulation processing, generates each coded modulation result and each the coded modulation result who strengthens packet of general data bag;
The stream map unit is used for the structure according to the multiple-input and multiple-output processing unit, and each coded modulation result of general data bag and each coded modulation result of enhancing packet are recombinated;
The multiple-input and multiple-output processing unit, be used for each coded modulation result of the general data bag after recombinating and each coded modulation result of the enhancing packet after the reorganization are carried out the multiple-input and multiple-output processing, generate each multiple-input and multiple-output result and each the multiple-input and multiple-output result that strengthens packet of general data bag;
The resource map unit, be used for according to predetermined pilot tone pattern, insert pilot tone to each multiple-input and multiple-output result of general data bag and each multiple-input and multiple-output result of strengthening packet, and will insert each multiple-input and multiple-output result of the general data bag after the pilot tone and each multiple-input and multiple-output result of the enhancing packet after the insertion pilot tone sends by sub-carrier resources.
Wherein, the restriction of second predetermined length is relevant with the number of antennas of ofdm system.The multiple-input and multiple-output processing unit is according to the indication of control signaling, and in one or more carry out the multiple-input and multiple-output processing to each coded modulation result of the general data bag after recombinating and each coded modulation result of the enhancing packet after the reorganization in the following manner: Space Time Coding pattern, precoding pattern, wave beam form pattern.Wherein, the equal in length of each segmentation result of general data bag, the equal in length of each segmentation result of enhancing packet.
The concrete workflow of emitting structural as shown in Figure 3 is as follows:
The first step: sign indicating number layer map unit cut apart further refinement with transmission block.The principle of cutting apart because of former transmission block is that the prevention transmission block is excessive, causes the internal memory of receiver and complexity too high, so after adopting sign indicating number layer map unit, earlier a transmission block (MAC) is divided into the general data bag and strengthens packet.Wherein, the general data bag adopts the partition principle of routine data bag, promptly surpasses the longest restriction of encoded packets, then bag is cut apart, and forms the minimum code unit; And the enhanced data bag is owing to mechanism such as multi-antenna technology that will adopt future development and quick feedbacks, so the partition principle of its packet no longer adopts conventional distribution principle, the maximum length of its bag is subject to the multi-antenna technology of employing, as adopt two streams multiplexing, the maximum constraints length of its bag is the twice of normal bag, is divided into the encoded packets of two antenna stream.Adopt same coded modulation speed, same control signaling, to reduce the control signaling consumption, feedback can be selected feedback in a manifold (right entirely, to, to two, completely wrong) simultaneously.Other supports more antenna performances to expand on this basis.
Second step: code modulation module produces modulation symbol.The function that this module is finished is forward error correction (forward error correct, be called for short FEC), comprise Cyclic Redundancy Check unit, data scrambling unit, chnnel coding unit, rate-matched unit, data interlacing unit and modulation treatment unit successively.Wherein:
The CRC check unit is used for calculating the CRC check bit of each transmission block.The generation of check bit is from a circulation generator polynomial, is used for the correctness of the transmission block that verification receives.
The data scrambling unit comes realization information to upset by scrambling, prevents that " 0 " or " 1 " continuously from appearring in input bit.
Chnnel coding unit (for example Turbo code, low density parity check code (low densityparity check is called for short LDPC) etc.) according to the different coding speed of system requirements, by different encoders, reaches maximum error correcting capability.
The data interlacing unit by methods such as displacement and displacement in the ranks in the row of bit input matrix, matrix, with data interlacing, guarantees that adjacent code is mapped to different subcarriers, to improve frequency diversity gain and performance.
The modulation treatment unit is mapped as plural symbol to Bit data, as (QPSK, 16QAM, 64QAM etc.).
The 3rd step: the stream map unit makes up structure and hierarchical relationship to adapt to the MIMO processing unit once more to coding layer.
The 4th step: the MIMO processing unit is selected MIMO pattern and integrated mode according to the indication of control signaling.Wherein, the MIMO pattern is Space Time Coding, precoding, wave beam formation (beamforming) etc., and the multithread grouping can be selected different antenna modes; Integrated mode can make up once more to different antenna modes, improves systematic function with maximum.
The 5th step: the resource map unit is carried out the subcarrier mapping, inserts functions such as pilot tone.Press certain pilot tone pattern and insert pilot tone, be used for receive channel and estimate, the carrier resource that distributes by the user arrives subcarrier with data map then.
The 6th step: form the OFDM symbol, promptly the symbol of a plurality of two-forties is become parallel low rate symbol.
In sum, the present invention is owing to cut apart further refinement with transmission block, and HARQ supports thereby provide more flexibly.With 1 transmission block is example, is divided into TB 1, TB2 in physical layer, forms symbol s1 after the coded modulation, and s2 is mapped to antenna 1 (ANT1), antenna 2 (ANT2) respectively, if during reception two whole mistakes of stream, can adopt the re-transmission mode of Alamouti decoding, promptly
If only one flows out mistake, then correct stream is abandoned, error flow is divided into two-way adopts
Adopt
Or adopt and to work two multiple modes such as antenna switching, the feature that only retransmits wrong stream and make full use of many antennas improves the reliability that secondary retransmits.
In addition, the present invention is owing to cut apart further refinement with transmission block, lowered the complexity of high-level scheduling, assigned resources again.Just can utilize the resource of original distribution to retransmit behind the physical layer direct decoding, needn't ask high level to reschedule resource, feedback speed obtains to improve, to satisfy the requirement of low time delay.In addition, modulate, take same length, take same running time-frequency resource owing to the data block after the segmentation adopts one and same coding, and only need same control signaling, therefore possess two stream feature expenses and reduced by one times again than two designs (as LTE) of flowing.
In addition, a sign indicating number layer map unit supported an input to multithread, if input is single transmission block, do not do in the sign indicating number layer map unit any variation then system degradation to the structure of 16e.If input is a plurality of transmission blocks, does not do to change in the sign indicating number layer map unit and lead directly to the design that then degenerates to LTE.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (6)
1. an emitter that is used for ofdm system is characterized in that, comprising:
Sign indicating number layer map unit, be used to receive transmission block from media access control layer, described transmission block is divided into the general data bag and strengthens packet, and described general data bag is cut apart a plurality of segmentation results that generate described general data bag according to first predetermined length restriction, limit according to second predetermined length described enhancing packet is cut apart a plurality of segmentation results that generate described enhancing packet;
The coded modulation unit, be used for respectively each segmentation result of described general data bag and each segmentation result of described enhancing packet being carried out the coded modulation processing, generate each coded modulation result of described general data bag and each coded modulation result of described enhancing packet;
The stream map unit is used for the structure according to the multiple-input and multiple-output processing unit, and each coded modulation result of described general data bag and each coded modulation result of described enhancing packet are recombinated;
Described multiple-input and multiple-output processing unit, be used for each coded modulation result of the described general data bag after the reorganization and each coded modulation result of the described enhancing packet after the reorganization are carried out the multiple-input and multiple-output processing, generate each multiple-input and multiple-output result of described general data bag and each multiple-input and multiple-output result of described enhancing packet;
The resource map unit, be used for each multiple-input and multiple-output result of described general data bag and each multiple-input and multiple-output result of described enhancing packet being mapped to each subcarrier according to the resource allocation principle, according to predetermined pilot tone pattern the pilot tone pattern is mapped on each subcarrier, and by carrying out contrary fast fourier transform formation OFDM symbol, after inserting Cyclic Prefix, launch by antenna element.
2. emitter according to claim 1 is characterized in that, described second predetermined length restriction is relevant with the number of antennas and the antenna mode of described ofdm system.
3. emitter according to claim 2, it is characterized in that, described multiple-input and multiple-output processing unit is according to the indication of control signaling, one or more mode combinations in the following manner, each coded modulation result of the described general data bag after the reorganization and each coded modulation result of the described enhancing packet after the reorganization are carried out the multiple-input and multiple-output processing: Space Time Coding pattern, precoding pattern, wave beam form pattern.
4. according to each described emitter in the claim 1 to 3, it is characterized in that the equal in length of each segmentation result of described general data bag, the equal in length of each segmentation result of described enhancing packet.
5. emitter according to claim 4 is characterized in that, described coded modulation unit comprises:
The transmission block verification unit is used for the correctness of the described transmission block of verification;
The bit scramble unit is used for each segmentation result of described general data bag and each segmentation result of described enhancing packet are carried out the scrambling processing, generates each scrambling result of described general data bag and each scrambling result of described enhancing packet;
The chnnel coding unit is used for each scrambling result of described general data bag and each scrambling result of described enhancing packet are carried out encoding process, generates the encoding process result of described general data bag and each encoding process result of described enhancing packet;
The data interlacing unit, be used for the encoding process result of described general data bag and each encoding process result of described enhancing packet are carried out the data interlacing processing, generate each interleaving treatment result of described general data bag and each interleaving treatment result of described enhancing packet; And
The modulation treatment unit is used for each interleaving treatment result of described general data bag and each interleaving treatment result of described enhancing packet are mapped as corresponding complex symbol.
6. emitter according to claim 5 is characterized in that, described transmission block verification unit adopts the mode of cyclic redundancy check (CRC) that described transmission block is carried out verification.
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| CN102104454A (en) * | 2009-12-18 | 2011-06-22 | 富士通株式会社 | Method and device for mapping code word flow to layer in multi-input multi-output communication system |
| WO2011097951A1 (en) * | 2010-02-11 | 2011-08-18 | 电信科学技术研究院 | Demodulation reference symbol port mapping method and apparatus |
| CN102723976A (en) * | 2012-06-19 | 2012-10-10 | 大唐移动通信设备有限公司 | Beamforming method and beamforming device |
| WO2012142886A1 (en) * | 2011-04-22 | 2012-10-26 | 中兴通讯股份有限公司 | Method and system for sending multi-antenna data |
| CN104995673A (en) * | 2013-02-13 | 2015-10-21 | 瑞典爱立信有限公司 | Frame error concealment |
| WO2018157795A1 (en) * | 2017-03-03 | 2018-09-07 | 华为技术有限公司 | Data processing method and apparatus |
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| WO2011072526A1 (en) * | 2009-12-18 | 2011-06-23 | 富士通株式会社 | Method and device for mapping codeword stream to layers in multiple input multiple output communication system |
| CN102104454A (en) * | 2009-12-18 | 2011-06-22 | 富士通株式会社 | Method and device for mapping code word flow to layer in multi-input multi-output communication system |
| CN102726014A (en) * | 2009-12-18 | 2012-10-10 | 富士通株式会社 | Method and device for mapping codeword stream to layers in multiple input multiple output communication system |
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| WO2011097951A1 (en) * | 2010-02-11 | 2011-08-18 | 电信科学技术研究院 | Demodulation reference symbol port mapping method and apparatus |
| WO2012142886A1 (en) * | 2011-04-22 | 2012-10-26 | 中兴通讯股份有限公司 | Method and system for sending multi-antenna data |
| CN102723976A (en) * | 2012-06-19 | 2012-10-10 | 大唐移动通信设备有限公司 | Beamforming method and beamforming device |
| CN102723976B (en) * | 2012-06-19 | 2015-02-04 | 大唐移动通信设备有限公司 | Beamforming method and beamforming device |
| CN104995673A (en) * | 2013-02-13 | 2015-10-21 | 瑞典爱立信有限公司 | Frame error concealment |
| CN104995673B (en) * | 2013-02-13 | 2016-10-12 | 瑞典爱立信有限公司 | Hiding frames error |
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| WO2018157795A1 (en) * | 2017-03-03 | 2018-09-07 | 华为技术有限公司 | Data processing method and apparatus |
| CN114142971A (en) * | 2021-11-29 | 2022-03-04 | 山东恒创智控科技有限公司 | Robot communication system, method and computer based on 5G |
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Application publication date: 20091104 |