CN113950101A - Multi-carrier index modulation system and method - Google Patents
Multi-carrier index modulation system and method Download PDFInfo
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- CN113950101A CN113950101A CN202111410146.XA CN202111410146A CN113950101A CN 113950101 A CN113950101 A CN 113950101A CN 202111410146 A CN202111410146 A CN 202111410146A CN 113950101 A CN113950101 A CN 113950101A
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- 230000005540 biological transmission Effects 0.000 claims description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
- H04W28/0263—Traffic management, e.g. flow control or congestion control per individual bearer or channel involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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Abstract
The invention discloses a multi-carrier index modulation system, which comprises a sending end and a receiving end, wherein bit information of the sending end is divided into two parts which respectively pass through a prototype pulse index selection module and a constellation mapping module; the receiving end carries out the detection of the prototype pulse index and the constellation symbol, and then sends the signals to the decoder to recover the sending signals; the invention combines index modulation with the prototype pulse design of FBMC, so that each subcarrier block of the communication system can dynamically match with a transceiving filter with similar time-frequency dispersion characteristics according to channel time-frequency state information obtained by environment sensing, and further the performance of the system is improved.
Description
Technical Field
The present invention relates to a modulation system and method, and more particularly, to a multi-carrier index modulation system and method.
Background
The fifth generation mobile communication (5G) puts higher requirements on the transmission efficiency of Multi-Carrier modulation, aiming at the defects of the orthogonal frequency division multiplexing technology, the Filter Bank Multi-Carrier modulation (FBMC) technology splits complex signals through offset quadrature amplitude modulation, and transmits real and imaginary values by interleaving 1/2 cycles, and meanwhile, a prototype pulse design with excellent time-frequency focusing characteristics is introduced, so that the out-band radiation is greatly reduced compared with rectangular pulses, the intersymbol interference and the intercarrier interference can be resisted under the condition of not needing additional cyclic prefixes, and the spectral efficiency and the error rate performance of a system are effectively improved. The current common index modulation is mainly used for mapping active subcarriers at a sending end, and controls the active subcarriers to transmit constellation data and the rest subcarriers to be set to be zero and silent according to index bits; due to the fact that the active subcarriers have sparse distribution due to the introduction of the silent subcarriers, frequency offset can be effectively resisted, but the application of the index modulation technology does not involve a filter prototype pulse in the multicarrier communication technology, and system performance needs to be further enhanced.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a multi-carrier index modulation system and a multi-carrier index modulation method, which are used for improving the spectrum efficiency and the error rate performance of the system.
The technical scheme is as follows: the invention relates to a multi-carrier index modulation system, comprising:
a transmitting end for forming a transmission signal; dividing the bit stream into G bit stream groups through a current divider, dividing bit information of each group into two parts, and respectively passing through a prototype pulse index selection module and a constellation mapping module; the FBMC block generator modulates the constellation symbols onto subcarriers to form transmission data, and selects a filter with the highest matching degree with a current channel time-frequency dispersion function as a prototype filter; the synthesis filter bank module modulates the transmission data to form a sending signal;
the receiving end is used for receiving and recovering the transmitted signal; the received signal of the receiving end is subjected to prototype pulse index detection and constellation symbol detection by a detector, and then is respectively sent to a filter index decoder and a constellation symbol decoder to recover the transmitted signal.
Further, the receiving end further includes a bit stream combiner for combining the decoding obtained by the filter index decoder and the constellation symbol decoder into a transmission signal.
Furthermore, the received signal of the receiving end is firstly grouped by the FBMC block grouping device, and each group of data is sent to the equalizer for linear equalization and then sent to the detector.
Further, the method for performing prototype filter detection in the receiving end is maximum likelihood detection or maximum correlation detection, where the maximum correlation detection is to calculate an integral of an output signal of the equalizer and a filter function, and a filter corresponding to the maximum energy value is an analysis filter used for receiving end demodulation.
The multi-carrier index modulation method comprises the following steps:
(1) the transmitting end divides the bit stream into G groups, the bit information of each group is two parts, and the filter prototype pulse selection and the constellation symbol mapping are respectively carried out;
(2) n to be selectedFThe prototype filter bank establishes index mapping, selects a subcarrier basis function with the highest matching degree with the time-frequency dispersion characteristic of the current channel and the prototype pulse dispersion characteristic for modulation, and transmits the subcarrier basis function to a receiving end through a channel;
(3) equalizing the received signal, and then carrying out prototype pulse index detection and constellation symbol detection;
(4) and decoding the detection result, recovering the transmitted information bits, and combining the decoded outputs of each group to obtain the original transmitted information.
Has the advantages that: compared with the prior art, the invention has the advantages that: by establishing index mapping selection for a plurality of prototype pulses and hiding part of binary information in index position information of a spatial filter bank domain, on one hand, the spectral efficiency of a system is improved, and on the other hand, different filter functions can be selected among different signal frames and subcarrier blocks to flexibly match channel state characteristics. Along with the refinement of the types of the selectable filters, the matching degree of the prototype pulse and the time-frequency dispersion of the current channel is continuously improved, the overall error rate performance is also continuously improved, and the method can be suitable for the communication scene of the dynamic time-varying channel state.
Drawings
Fig. 1 is a block diagram of a transmitting end of a multi-carrier index modulation system according to the present invention;
FIG. 2 is a table of filter index encodings in accordance with an embodiment of the present invention;
fig. 3 is a block diagram of a receiving end of a multi-carrier index modulation system according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The multi-carrier index modulation system comprises a sending end and a receiving end.
As shown in fig. 1, the transmitting end includes a bit splitting module, a prototype pulse index selection module, a constellation mapping module, an FBMC block generator, and a comprehensive filter bank, and sets M subcarriers in total for the FBMC communication system, and the constellation mapping is modulated by 4 QAM.
At a transmitting end, a B bit binary serial bit stream is converted into a parallel bit stream through serial-to-parallel conversion and is divided into G parallel bit stream groups through a bit splitter, each group comprises p bit information, wherein p is1Bit information for matching selection of prototype pulse and time-frequency dispersion state of current channel, p2The bits are used for constellation symbol mapping carried by the carrier itself.
p1Number of bits and optional filter type NFRelated, is represented as
Wherein the content of the first and second substances,
for the rounding down function, the prototype pulse index selection output of the g-th group is FgG is 1 … … G; when N is presentFWhen smaller, the mapping scheme of the index can be realized by using a table look-up method. Selecting 8 filters with different performances as shown in FIG. 2 for index coding, wherein the time-frequency dispersion characteristics of the filters are known, and then each group of required p1And selecting the filter basis function of the current subcarrier block according to the time-frequency dispersion characteristic of the current channel state, wherein the index information is 3 bits. P considering all sub-carriers are activated for information transmission2＝log2Q, where Q represents the dimension of the constellation mapping used, so that the total number of bits at the transmitting end satisfies B-pG (p)1+p2) G. The constellation symbol of the g-th group is xg＝[xg(1)K xg(K)]，xg(k) And E is S, and S is a constellation symbol set with dimension Q.
The FBMC block generator modulates each group of constellation symbols onto corresponding subcarriers to form transmission data x (0) -x (M-1), and selects a filter with the highest pulse dispersion characteristic and the highest matching degree of the current channel time-frequency dispersion function as gm(t) forming a transmission signal after being modulated by the synthesis filter bank
Additional phase
And v is a subcarrier interval, T is a symbol period, and v is 1/T. gm(t) represents a prototype filter employed for the mth subcarrier, the filter length being LgO is the oversampling factor. a ism,nAnd bm,nAre the real and imaginary values of the symbol at the time-frequency grid point (m, n).
As shown in fig. 3, the receiving end includes an FBMC block packetizer, an equalizer, a detector, a decoder, and a bit stream combiner, the detector includes a prototype pulse detection module, a subcarrier basis function module, and a symbol detection module, and the decoder includes a filter index decoder and a constellation symbol decoder.
After the received signal passes through the FBMC block packetizer, the received signal is divided into corresponding G groups of data, and each group of data is sent to an equalizer, such as MMSE (minimum mean square error) and LS (least square error) linear equalizers.
The output result of the equalizer is firstly subjected to prototype pulse detection and constellation symbol detection by a detector, and two detection methods are provided as follows:
the method comprises the following steps: and (4) carrying out maximum likelihood joint detection.
Using the equalized signals of the g-th group
Comparing all possible constellation symbol mapping and filter selection combination conditions of the group to carry out maximum likelihood estimation
Wherein psi is NFA set of filter bank prototype impulse responses.
The second method comprises the following steps: and detecting the maximum correlation.
After equalization, the correlation with the currently used transmit filter is compared by a set of analysis filter banks, which satisfy gn(t)＝fn(Tf-t). During the filter duration period TfThe internal detector output can be expressed as
The filter corresponding to the maximum value of the output energy is an analysis filter for demodulation at the receiving end, i.e.
Detecting the result
Feeding into a filter index decoder to obtain p1Bit, will
Sent to a constellation symbol decoder to obtain p2And combining the bits through a bit stream combiner to obtain the final recovery bits.
Claims (8)
1. A multi-carrier index modulation system, comprising:
a transmitting end for forming a transmission signal; dividing the bit stream into G bit stream groups through a current divider, dividing bit information of each group into two parts, and respectively passing through a prototype pulse index selection module and a constellation mapping module; the FBMC block generator modulates the constellation symbols onto subcarriers to form transmission data, and selects a filter with the highest matching degree with a current channel time-frequency dispersion function as a prototype filter; the synthesis filter bank module modulates the transmission data to form a sending signal;
the receiving end is used for receiving and recovering the transmitted signal; the received signal of the receiving end is subjected to prototype pulse index detection and constellation symbol detection by a detector, and then is respectively sent to a filter index decoder and a constellation symbol decoder to recover the transmitted signal.
2. The system according to claim 1, wherein the receiver further comprises a bit combiner for combining the decoded signals from the filter index decoder and the constellation symbol decoder into a transmission signal.
3. A multi-carrier index modulation system as claimed in claim 1, wherein the received signal at the receiving end is first grouped by FBMC block packers, and each group of data is sent to an equalizer for linear equalization and then to a detector.
4. A multi-carrier index modulation system as claimed in claim 3, wherein the prototype filter detection is performed by maximum likelihood detection or maximum correlation detection in the receiving end, the maximum correlation detection is an integral of the equalizer output signal and a filter function, and the filter corresponding to the energy maximum is an analysis filter for demodulation in the receiving end.
5. The system according to claim 1, wherein the constellation symbol detection method in the receiving end is maximum likelihood detection.
6. A multi-carrier index modulation system as claimed in claim 1, wherein the bit number of the prototype pulse index selection block is selected by the transmitting end
Wherein N isFFor the number of prototype filter types that can be selected,
is a rounded down function.
7. A multi-carrier index modulation system according to claim 1, wherein in the transmitting end, the number p of bits passed through the constellation mapping module2＝log2Q, where Q is the dimension of the constellation mapping.
8. A multi-carrier index modulation method is characterized by comprising the following steps:
(1) the transmitting end divides the bit stream into G groups, the bit information of each group is two parts, and the filter prototype pulse selection and the constellation symbol mapping are respectively carried out;
(2) n to be selectedFThe prototype filter bank establishes index mapping, selects a subcarrier basis function with the highest matching degree with the time-frequency dispersion characteristic of the current channel and the prototype pulse dispersion characteristic for modulation, and transmits the subcarrier basis function to a receiving end through a channel;
(3) equalizing the received signal, and then carrying out prototype pulse index detection and constellation symbol detection;
(4) and decoding the detection result, recovering the transmitted information bits, and combining the decoded outputs of each group to obtain the original transmitted information.
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| CN114944977A (en) * | 2022-04-12 | 2022-08-26 | 江苏科技大学 | Multi-dimensional index modulation OTFS communication system and method |
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