CN108847917B - Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern - Google Patents
Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern Download PDFInfo
- Publication number
- CN108847917B CN108847917B CN201810688100.6A CN201810688100A CN108847917B CN 108847917 B CN108847917 B CN 108847917B CN 201810688100 A CN201810688100 A CN 201810688100A CN 108847917 B CN108847917 B CN 108847917B
- Authority
- CN
- China
- Prior art keywords
- sub
- pilot
- pilot frequency
- frequency
- subcarriers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005540 biological transmission Effects 0.000 title claims abstract description 15
- 239000000969 carrier Substances 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000013507 mapping Methods 0.000 claims description 21
- 230000004913 activation Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 238000013506 data mapping Methods 0.000 claims description 4
- 238000010606 normalization Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005562 fading Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007476 Maximum Likelihood Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention belongs to the technical field of communication anti-interference, and particularly relates to a pilot frequency pattern modulation orthogonal frequency division multiplexing transmission method. The invention takes a sub-carrier block as a unit, designs and generates a pilot frequency symbol sequence with the length equal to the number of the sub-carriers in the block, each sub-carrier in the sub-block corresponds to a pilot frequency symbol, pilot frequency symbol combinations corresponding to different pilot frequency activated sub-carrier combinations in the sub-block are different, and index bits are used for selecting the pilot frequency activated sub-carriers of the sub-block and the corresponding pilot frequency symbol combinations; this same pilot symbol sequence is used for all sub-blocks. The invention makes full use of the known pilot frequency information of the transmitting and receiving ends, and carries out pilot frequency pattern modulation according to the index bit, thereby improving the pilot frequency position detection performance and the signal detection performance of the system, and finally improving the BER performance of the system.
Description
Technical Field
The invention belongs to the technical field of communication anti-interference, and particularly relates to a pilot Frequency pattern Modulation Orthogonal Frequency Division Multiplexing (IM-OFDM) transmission method for an Index Modulation Orthogonal Frequency Division Multiplexing (IM-OFDM) system.
Background
Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed transmission technology in the field of wireless communication, and has become one of the core technologies of 4G mobile communication systems. The method is to decompose a high-rate data stream into a plurality of low-rate sub-data streams, i.e. to divide a signal into a plurality of orthogonal sub-carriers, and to transmit the signal simultaneously by using the mutually orthogonal sub-carriers. The orthogonality among the sub-carriers enables fading experienced by each sub-channel to be relatively flat, then the cyclic prefix is introduced to reduce inter-symbol interference, the method has the advantages of high frequency spectrum utilization rate, good multipath effect resistance and the like, and the fast Fourier transform provides a simple and low-cost implementation mode.
To ensure that the performance of the OFDM system is not affected by the multipath and fading effects of the channel, a channel estimation method is used to track the variation of the channel response. Among many channel estimation algorithms, channel estimation based on a pilot signal is the most commonly used method because it can effectively mitigate and compensate the effects of multipath fading of a wireless channel. In a conventional OFDM system, common pilot structures can be divided into block pilots, comb pilots, and diamond pilots, which are all used to complete channel estimation by inserting pilots at fixed positions, according to different pilot placement modes.
The recent Index Modulation (IM) technique further improves the performance of the OFDM system. The method divides the system frequency domain subcarrier into an active subcarrier and a silent subcarrier, wherein only the active subcarrier transmits a constellation point symbol, the silent subcarrier does not transmit data, and index bit information is implicit in the selection of the subcarrier for transmission. Compared with the traditional OFDM system, the IM-OFDM system adopts a blocking mode, pilot symbols can be transmitted by silent subcarriers, and the insertion position of the pilot is not fixed any more, so that the pilot position needs to be detected at a receiving end, and the performance of the pilot position detection can have great influence on the system performance. In the IM-OFDM system, the system performance can be effectively improved and the error rate of the system can be reduced by fully utilizing the known pilot frequency information of the transmitting and receiving ends.
Disclosure of Invention
The invention provides a pilot frequency pattern modulation orthogonal frequency division multiplexing transmission method based on the purpose of reducing the system error rate. The method takes a sub-block as a unit, each sub-carrier in the sub-block corresponds to a pilot frequency symbol, and index bits are used for selecting pilot frequency activated sub-carriers of the sub-block and corresponding pilot frequency symbol combinations.
The technical scheme of the invention is as follows:
setting the total number of subcarriers as N and the number of subcarriers of each sub-block as N, wherein k subcarriers are data activated subcarriers for transmitting constellation point symbols, and (N-k) subcarriers are pilot activated subcarriers for transmitting pilot, alphaSMapping the average normalized transmit power, alpha, of the subcarriers for dataPMapping the average normalized transmit power of sub-carriers for pilot, M ═ alphaS/αP；
A transmitting end:
a. partitioning: carrying out blocking processing on sub-carriers of an IM-OFDM system to obtain g-N/N sub-blocks;
b. pilot frequency generation: designing and generating a pilot symbol sequence with the length of n, and distributing the pilot symbol sequence to n subcarriers of a subblock, so that each subcarrier corresponds to a pilot symbol; all sub-blocks adopt the pilot frequency symbol sequence with the length of n, and also adopt the same mapping relation between sub-carriers and pilot frequency symbols; the condition that the pilot symbol sequence with the length of n needs to satisfy is as follows:
(1) in the pilot symbol sequence with the length of n, the same pilot symbols can be present;
(2) in one sub-block, for all possible pilot frequency mapping sub-carrier combinations determined by the index bit, the pilot frequency symbol combinations corresponding to different pilot frequency mapping sub-carrier combinations are different;
c. pilot frequency power calculation: in the invention, the sending power of the data mapping sub-carrier is set to be larger than that of the pilot mapping sub-carrier, and the sending power of the data mapping sub-carrier and the pilot mapping sub-carrier after average normalization satisfies k.alphaS+(n-k)·αPN, and αS>1,αP<1, bound M ═ αS/αPCalculating alphaS、αP；
d. Pilot pattern modulation: for each sub-block, the modulation module extracts the corresponding index bit first, selects (n-k) pilot frequency activated sub-carriers of the sub-block according to the mapping relation between the index bit and the pilot frequency activated sub-carriers, selects (n-k) pilot frequency symbols corresponding to the (n-k) pilot frequency activated sub-carriers as the pilot frequency sequence transmitted by the sub-block according to the mapping relation between the sub-carriers and the pilot frequency symbols, and sends the corresponding pilot frequency symbols respectively by each pilot frequency activated sub-carrier according to the power alpha calculated in cPPerforming power distribution on the pilot frequency activated subcarriers; the rest k subcarriers in the subblock are used as the data active subcarriers of the subblock; the length of the index bit corresponding to each sub-block is
Wherein
Is a rounded down function;
e. information data storagePlacing: extracting modulation bits, modulating the modulation bits by M-QAM to obtain constellation point symbols to be transmitted, then sequentially placing the constellation point symbols on corresponding data activated subcarriers, and calculating the power alpha of the data activated subcarriers according to cSCarrying out power distribution to obtain a sending symbol vector X;
f. frequency domain-time domain transformation: e, sequentially carrying out serial-parallel conversion, IFFT, parallel-serial conversion, Cyclic Prefix (CP) addition and other operations on the transmission symbol vector X obtained by e to obtain an IM-OFDM symbol, and transmitting the IM-OFDM symbol;
receiving end:
g. pilot frequency acquisition: combining pilot symbols corresponding to each subcarrier into a pilot symbol sequence P with the length of N according to the arrangement sequence of the subcarriers;
h. and (3) first pilot frequency position judgment: the frequency domain receiving signal Y adopts the same blocking mode as the transmitting end, energy detection is carried out on each sub-block after blocking, the (n-k) sub-carrier position with the lowest energy in each sub-block is found out and marked as the pilot frequency position of the current sub-block, and the pilot frequency positions of all the sub-blocks form a pilot frequency position set L1From a set L of pilot positions1Obtaining a frequency domain received signal Y at a pilot positionP1And a pilot P at the pilot position1；
i. Initial channel estimation: receiving a signal Y from a frequency domainP1Pilot frequency P1And a set of pilot positions L1Performing channel estimation to obtain a first channel estimation value
j. And (3) second pilot frequency position judgment: based on the channel estimation
And detecting the frequency domain receiving signal Y, recovering the transmitted data stream, and obtaining a pilot frequency position set L according to a modulation module which is the same as the transmitting end2According to L2Obtaining YP2And P2；
k. Updating the channel estimation value again: receiving a signal Y from a frequency domainP2Pilot frequency P2And a set of pilot positions L2Performing a second channel estimation to obtain a second channel estimation value
Repeating the steps j to k according to the set equalization times to obtain a final channel estimation value
According to the final channel estimation value
And detecting the frequency domain receiving signal Y to recover the transmitted data stream.
The invention carries on the pilot frequency pattern modulation according to the index bit, the index bit is different, the pilot frequency of the subblock activates the subcarrier combination differently, correspondingly, the pilot frequency symbol sequence that the subblock transmits is different too, have utilized the known pilot frequency information of the transmitting-receiving end more fully, have improved the pilot frequency position detection performance and signal detection performance of the system, has improved the BER performance of the system finally.
Drawings
FIG. 1 is a diagram illustrating the mapping relationship between sub-carriers and pilot symbols in any sub-block of an embodiment, where P is1,P2,P3,P4Pilot symbols representing each sub-block;
FIG. 2 is a modulation scheme of an embodiment, wherein X11,X12...,Xg1,Xg2Representing modulated data symbols, P1,P2,P3,P4Pilot symbols representing each sub-block;
fig. 3 is a block diagram of a system transmitting end applying a pilot pattern modulation orthogonal frequency division multiplexing transmission method.
Fig. 4 is a block diagram of a system receiving end applying a pilot pattern modulation orthogonal frequency division multiplexing transmission method.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings and embodiments:
the invention designs a pilot frequency pattern modulation orthogonal frequency division multiplexing transmission method. The invention takes a sub-carrier block with the length of n as a unit, designs and generates a pilot frequency symbol sequence with the length of n, each sub-carrier in a sub-block corresponds to a pilot frequency symbol, and an index bit is used for selecting the pilot frequency activation sub-carrier of the sub-block and the corresponding pilot frequency symbol combination.
Example (b):
the specific embodiment of the present invention is described below with the total number N of subcarriers being 1024, the number N of subcarriers in each subblock being 4, the number k of data activated subcarriers used for transmitting constellation point symbols in a subblock being 2, the cyclic prefix CP being 64, the modulation symbols being BPSK, performing interleaving index modulation, the channel estimation all using CS channel estimation, the signal detection all using ML detection method, and equalization 1 time as an example.
As shown in the modulation schematic diagram of fig. 2, the implementation process is roughly divided into the following steps:
the specific structure of the transmitting end is shown in fig. 3:
step 1-1: the sub-carriers are divided into blocks, and the number g of the divided sub-blocks is N/N is 256. And then calculating the bit number of one frame according to a formula. The index bit length for any one of the sub-blocks is:
indicating rounding down, the index bits have m total for one frame of the system1＝p1g is 512 bits; the data activated subcarrier is used for transmitting BPSK modulation symbols, the modulation order M is 2, and the number of modulation bits that can be transmitted in one frame is: m is2＝g·k·log2M is 512, the total number of bits M in a frame is M1+m 21024. Dividing the frame data into two groups, one group is index bit for selecting pilot frequency activation sub-carrier and corresponding pilot frequency symbol combination, and the other group is modulation bit for obtaining constellation point symbol to be sent through BPSK modulation.
Step 1-2: generating pilots, as shown in fig. 1, for any sub-block containing 4 sub-carriers, the pilot symbol sequence is designed as P1,P2,P3,P4]＝[-1j,1j,1j,-1j]Wherein, the index bit 00 corresponds to the pilot frequency activation subcarrier as subcarrier 3 and subcarrier 4, the pilot frequency symbol combination is [1j, -1j]The index bit 01 corresponds to the pilot activation sub-carriers of sub-carrier 1 and sub-carrier 4, and the pilot symbol combination is [ -1j, -1j]The index bit 10 corresponds to pilot activation subcarriers of subcarrier 1 and subcarrier 2, and the pilot symbol combination is [ -1j,1j]The index bit 11 corresponds to the pilot activation sub-carriers of sub-carrier 2 and sub-carrier 3, and the pilot symbol combination is [1j,1j ]]The pilot symbol sequence is designed to meet the requirements of the invention;
step 1-3: calculating the subcarrier transmission power and setting alphaS/α P4, k · α is satisfied after the average normalization according to the transmission powerS+(n-k)·αPN, calculating alphaS＝1.6，αP0.4, wherein αSMapping the average normalized transmit power, alpha, of the subcarriers for dataPMapping the average normalized transmit power of the sub-carriers for the pilot;
step 1-4: carrying out pilot frequency pattern modulation, and extracting corresponding p for each sub-block1Selecting 2 pilot frequency activated sub-carriers of the sub-block according to the mapping relation between the index bits and the pilot frequency activated sub-carriers, selecting 2 pilot frequency symbols corresponding to the 2 pilot frequency activated sub-carriers as a pilot frequency sequence transmitted by the sub-block, respectively transmitting the respective corresponding pilot frequency symbols by the two pilot frequency activated sub-carriers, and calculating the power alpha according to the steps 1-3PCarrying out power distribution on the pilot frequency activated subcarrier as 0.4; the rest 2 sub-carriers in the sub-block are used as the data active sub-carriers of the sub-block;
step 1-5: placing information data, extracting modulation bits, obtaining constellation point symbols to be sent by carrying out BPSK modulation on the modulation bits, then placing the constellation point symbols on corresponding data activated subcarriers in sequence, and carrying out power alpha calculated in the step 1-3 on the data activated subcarriersSPower allocation is performed as 1.6;
step 1-6: interleaving, namely placing adjacent subcarriers in an interleaving manner to obtain a sending symbol vector X;
step 1-7: and (3) frequency domain-time domain transformation, namely performing serial-parallel conversion, IFFT, parallel-serial conversion, Cyclic Prefix (CP) addition and other operations on the transmitted symbol vector X in sequence to obtain an IM-OFDM symbol, and transmitting the IM-OFDM symbol.
The specific structure of the receiving end is shown in fig. 4:
step 2-1: pilot frequency acquisition, namely combining pilot frequency symbols corresponding to each subcarrier into a pilot frequency symbol sequence P with the length of N being 1024 according to the arrangement sequence of the subcarriers;
step 2-2: the first pilot frequency position judgment, the frequency domain receiving signal Y adopts the same block dividing mode as the sending end, the sub-carriers of each sub-block are arranged in descending order according to the energy after the block dividing, the position of the (n-k) which is the lowest in energy in each sub-block is found out and marked as the pilot frequency position of the current sub-block, and the pilot frequency position set L is formed by 512 pilot frequency positions of all sub-blocks1From a set L of pilot positions1Obtaining a frequency domain received signal Y at a pilot positionP1And a pilot P at the pilot position1；
Step 2-3: initial channel estimation from the frequency domain received signal YP1Pilot frequency P1And a set of pilot positions L1Obtaining a first channel estimation value by using a CS channel estimation method
Step 2-4: second pilot position determination based on the channel estimation
And carrying out maximum likelihood detection (ML) on the frequency domain received signal Y to recover the transmitted data stream, and obtaining a pilot frequency position set L according to a modulation module which is the same as the transmitting end2According to L2Obtaining YP2And P2(ii) a ML detection is carried out according to sub-blocks, each sub-block adopts a pilot frequency symbol sequence which is the same as that of a transmitting terminal, and pilot frequencies corresponding to 4 sub-carriers of each sub-blockThe symbol sequence is [ P ]1,P2,P3,P4]＝[-1j,1j,1j,-1j]；
Step 2-5: updating the channel estimation value again, and receiving the signal Y according to the frequency domainP2Pilot frequency P2And a set of pilot positions L2Obtaining a second channel estimation value by using a CS channel estimation method
Since the number of equalizations is set to 1, it is possible to set the number of equalizers to 1
I.e. the final channel estimation value
Step 2-6: according to the final channel estimation value
And performing ML detection on the frequency domain received signal Y to recover the transmitted data stream.
Claims (1)
1. A pilot frequency pattern modulation orthogonal frequency division multiplexing transmission method is used for an IM-OFDM system, the total number of subcarriers is set to be N, the number of subcarriers of each subblock is set to be N, k subcarriers are data activated subcarriers and are used for sending constellation point symbols, the (N-k) subcarriers are pilot frequency activated subcarriers and are used for sending pilot frequencies, and the modulation order M is alphaS/αPIn which α isSMapping the average normalized transmit power, alpha, of the subcarriers for dataP-average normalized transmit power for pilot mapped subcarriers, characterized in that said transmission method comprises the steps of:
a transmitting end:
a. partitioning: carrying out blocking processing on sub-carriers of an IM-OFDM system to obtain g-N/N sub-blocks;
b. pilot frequency generation: designing and generating a pilot symbol sequence with the length of n, and distributing the pilot symbol sequence to n subcarriers of a subblock, so that each subcarrier corresponds to a pilot symbol; all sub-blocks adopt the pilot frequency symbol sequence with the length of n, and also adopt the same mapping relation between sub-carriers and pilot frequency symbols; the condition that the pilot symbol sequence with the length of n needs to satisfy is as follows:
(1) the pilot symbol sequence with the length of n has the same pilot symbols;
(2) in one sub-block, for all possible pilot frequency mapping sub-carrier combinations determined by the index bit, the pilot frequency symbol combinations corresponding to different pilot frequency mapping sub-carrier combinations are different;
c. pilot frequency power calculation: setting the transmitting power of the data mapping sub-carrier to be larger than that of the pilot mapping sub-carrier, and the transmitting power of the data mapping sub-carrier and the pilot mapping sub-carrier after average normalization satisfies k.alphaS+(n-k)·αPN, and αS>1,αP<1, bound M ═ αS/αPCalculating alphaS、αP；
d. Pilot pattern modulation: for each sub-block, the modulation module extracts the corresponding index bit first, selects (n-k) pilot frequency activated sub-carriers of the sub-block according to the mapping relation between the index bit and the pilot frequency activated sub-carriers, selects (n-k) pilot frequency symbols corresponding to the (n-k) pilot frequency activated sub-carriers as the pilot frequency sequence transmitted by the sub-block according to the mapping relation between the sub-carriers and the pilot frequency symbols, and sends the respective corresponding pilot frequency symbols by each pilot frequency activated sub-carrier respectively, and obtains the power alpha in step cPPerforming power distribution on the pilot frequency activated subcarriers; the rest k subcarriers in the subblock are used as the data active subcarriers of the subblock; the length of the index bit corresponding to each sub-block is
Wherein
Is a rounded down function;
e. information data placement: extracting modulation bits, and modulating the modulation bits by M-QAM to obtain the desired transmissionThe sent constellation point symbols are then placed on the corresponding data activation sub-carriers in sequence, and the data activation sub-carriers are subjected to the power alpha obtained in the step cSCarrying out power distribution to obtain a sending symbol vector X;
f. frequency domain-time domain transformation: e, sequentially carrying out serial-parallel conversion, IFFT, parallel-serial conversion and cyclic prefix adding on the transmitting symbol vector X obtained in the step e to obtain an IM-OFDM symbol, and transmitting the IM-OFDM symbol;
receiving end:
g. pilot frequency acquisition: combining pilot symbols corresponding to each subcarrier into a pilot symbol sequence P with the length of N according to the arrangement sequence of the subcarriers;
h. and (3) first pilot frequency position judgment: the frequency domain receiving signal Y adopts the same blocking mode as the transmitting end, energy detection is carried out on each sub-block after blocking, the (n-k) sub-carrier position with the lowest energy in each sub-block is found out and marked as the pilot frequency position of the current sub-block, and the pilot frequency positions of all the sub-blocks form a pilot frequency position set L1From a set L of pilot positions1Obtaining a frequency domain received signal Y at a pilot positionP1And a pilot P at the pilot position1；
i. Initial channel estimation: receiving a signal Y from a frequency domainP1Pilot frequency P1And a set of pilot positions L1Performing channel estimation to obtain a first channel estimation value
j. And (3) second pilot frequency position judgment: based on the channel estimation
And detecting the frequency domain receiving signal Y, recovering the transmitted data stream, and obtaining a pilot frequency position set L according to a modulation module which is the same as the transmitting end2According to L2Obtaining YP2And P2；
k. Updating the channel estimation value again: receiving a signal Y from a frequency domainP2Pilot frequency P2And a set of pilot positions L2Go forward and go forwardPerforming second channel estimation to obtain second channel estimation value
Repeating the steps j to k according to the set equalization times to obtain a final channel estimation value
According to the final channel estimation value
And detecting the frequency domain receiving signal Y to recover the transmitted data stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688100.6A CN108847917B (en) | 2018-06-28 | 2018-06-28 | Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810688100.6A CN108847917B (en) | 2018-06-28 | 2018-06-28 | Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108847917A CN108847917A (en) | 2018-11-20 |
| CN108847917B true CN108847917B (en) | 2021-03-16 |
Family
ID=64200668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810688100.6A Expired - Fee Related CN108847917B (en) | 2018-06-28 | 2018-06-28 | Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108847917B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412998B (en) * | 2018-12-25 | 2020-12-18 | 电子科技大学 | Position pattern design method in pilot frequency pattern modulation system |
| CN110995637B (en) * | 2019-11-29 | 2020-12-04 | 北京邮电大学 | Signal modulation and demodulation method and device combining subcarrier activation and modulation selection |
| CN115842611A (en) * | 2021-09-18 | 2023-03-24 | 维沃移动通信有限公司 | Mapping method, device, equipment and storage medium |
| CN115276938A (en) * | 2022-07-21 | 2022-11-01 | 电子科技大学 | Pilot frequency transmission method for multi-antenna subcarrier index modulation OFDM |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337921A (en) * | 2015-10-10 | 2016-02-17 | 中铁二院工程集团有限责任公司 | Multicarrier nonorthogonal transmission method based on subcarrier index modulation |
| CN106453190A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Multi-user sub-carrier index modulation orthogonal frequency-division multiplexing (SIM-OFDM) transmission method |
| CN106656875A (en) * | 2017-02-21 | 2017-05-10 | 电子科技大学 | Channel estimation method for sub-carrier index modulation OFDM system |
| CN107147483A (en) * | 2017-06-21 | 2017-09-08 | 电子科技大学 | A kind of SIM ofdm system communication means modulated based on pilot frequency design |
-
2018
- 2018-06-28 CN CN201810688100.6A patent/CN108847917B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337921A (en) * | 2015-10-10 | 2016-02-17 | 中铁二院工程集团有限责任公司 | Multicarrier nonorthogonal transmission method based on subcarrier index modulation |
| CN106453190A (en) * | 2016-10-10 | 2017-02-22 | 东南大学 | Multi-user sub-carrier index modulation orthogonal frequency-division multiplexing (SIM-OFDM) transmission method |
| CN106656875A (en) * | 2017-02-21 | 2017-05-10 | 电子科技大学 | Channel estimation method for sub-carrier index modulation OFDM system |
| CN107147483A (en) * | 2017-06-21 | 2017-09-08 | 电子科技大学 | A kind of SIM ofdm system communication means modulated based on pilot frequency design |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108847917A (en) | 2018-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108847917B (en) | Orthogonal frequency division multiplexing transmission method modulated by pilot frequency pattern | |
| Liang et al. | Doppler resilient orthogonal time-frequency space (OTFS) systems based on index modulation | |
| CN105530217B (en) | The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance | |
| CN108900291B (en) | Data-pilot frequency pattern joint index modulation method for SIM-OFDM system | |
| CN102638437B (en) | Multi-carrier transmission method and device based on selected carrier modulation | |
| CN104618082B (en) | A kind of multiple antennas SIM OFDM multi-carrier wireless transmission methods | |
| CN106453190A (en) | Multi-user sub-carrier index modulation orthogonal frequency-division multiplexing (SIM-OFDM) transmission method | |
| CN103595685A (en) | SIM-OFDM communication method | |
| CN101291313B (en) | Wireless signal transmitting method, system and mobile station | |
| CN101204030A (en) | Quadrature frequency-division and time-division transmitter, receiver and method thereof | |
| CN104780033B (en) | A kind of self-adaptive method for allotting sub carriers for SIM ofdm systems | |
| CN107332799B (en) | Planisphere design method for index modulation ofdm system | |
| CN107707500B (en) | OFDM (orthogonal frequency division multiplexing) serial number modulation method based on multiple modes | |
| CN101394385B (en) | Method for promoting OFDM system based on time domain processing combined channel estimation | |
| CN101141167B (en) | Single carrier frequency domain equalization method and system in DFT-CDMA system | |
| CN102752253A (en) | Method for inhibiting inter-carrier interference of orthogonal frequency division multiplexing (OFDM) system by time-frequency domain combined processing | |
| CN105049397A (en) | Power distribution method for SIM-OFDM system | |
| CN112702298A (en) | OFDM signal transmission method for expanding mixed carrier wave precoding | |
| CN101702704A (en) | Receiving and transmitting method of multi-carrier spread spectrum with synchronous time domain, device and system thereof | |
| CN109412998B (en) | Position pattern design method in pilot frequency pattern modulation system | |
| CN101355546B (en) | Method for self-eliminating ICI of OFDM system based on self-adapting modulation | |
| CN101304398A (en) | Method for reducing PAR of OFDM system | |
| CN105207744B (en) | Pretreatment power distribution method based on Euclidean distance | |
| CN105119861B (en) | A kind of intertexture carrier index modulates the continuous ofdm system BER ameliorative ways of N ranks | |
| CN107317783B (en) | Self-adaptive modulation method for index modulation OFDM |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210316 |