CN103595685B - A kind of SIM-OFDM communication means - Google Patents
A kind of SIM-OFDM communication means Download PDFInfo
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- CN103595685B CN103595685B CN201310613915.5A CN201310613915A CN103595685B CN 103595685 B CN103595685 B CN 103595685B CN 201310613915 A CN201310613915 A CN 201310613915A CN 103595685 B CN103595685 B CN 103595685B
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Abstract
A kind of SIM ofdm communication method, belongs to Communication Anti-Jamming Techniques field.At transmitting terminal by improving the mapping method of sub-carrier indices modulation, i.e. introduce a kind of new mapping rule and make between the subcarrier in each sub-block separate, do so and increase minimum Eustachian distance, thus improve systematic function；At receiving terminal, for the complexity of Maximum Likelihood Detection, the present invention proposes a kind of new frequency domain detection technology, can also greatly reduce complexity while reaching the performance of Maximum Likelihood Detection.
Description
Technical field
The invention belongs to Communication Anti-Jamming Techniques field, relate to OFDM (Orthogonal Frequency Division
Multiplexing) technology, sub-carrier indices modulation (Subcarrier Index Modulation, SIM) its relevant frequency domain detection of technology
Technology.
Background technology
OFDM technology is the high speed transmission technology under a kind of infinite environment, and the ultimate principle of this technology is to be become by high-speed serial data
Change the parallel data of multichannel relative low speeds into and different subcarriers is modulated.This parallel transmission body constitution divides the signal into perhaps
Then data are modulated by the most orthogonal subcarrier with subcarrier, are therefore greatly expanded the pulse width of symbol, effectively
Resist intersymbol interference (Inter-Symbol Interference, ISI), improve the performance to anti-multipath fading.With conventional frequency division
Multiplexing is compared, and OFDM need not guard band, although has spectrum overlapping, but is mutually orthogonal between each carrier wave, root
Understand according to orthogonality principle and there is not interference between each carrier wave, thus drastically increase the availability of frequency spectrum.
Recently, ofdm system based on sub-carrier indices modulation (Subcarrier Index Modulation, SIM) is proposed as
New multi-carrier communication mode.Existing SIM-OFDM communication means, as it is shown in figure 1, digitized information source is through serioparallel exchange
Rear feeding SIM modulation module carries out sub-carrier indices modulation, is then passed through IFFT, parallel-serial conversion, adds CP, as sending number
According to sending, after multipath channel and Gaussian white noise channel, arrive receiving terminal.Receiving terminal through past CP, serioparallel exchange,
FFT laggard row frequency domain equalization, frequency domain equalization can be ZF equilibrium or MMSE equilibrium, carries out signal detection, finally after equilibrium
Export after detection signal is carried out parallel-serial conversion.For SIM-OFDM, owing to, in addition to SIM modulation module, other walks
Rapid and conventional OFDM systems zero difference, and first whole multicarrier is divided into multiple by its core SIM modulation module continuously
Sub-block, the some subcarriers in each sub-block are to select some of them subcarrier to send data by index bit, and other
Subcarrier is mourned in silence, and detects index bit by the subcarrier of transmission data position in whole multicarrier, i.e. positional information is taken
The information of tape index bit, index bit does not send itself, is i.e. not take up frequency spectrum resource.
Existing SIM-OFDM communication means, compared with OFDM, has less papr；By adjusting merit
Rate allocation strategy can save transmitter energy；There is the lower bit error rate；Antagonism inter-sub-carrier interference performance is more preferable.Shortcoming is former
Some systems performance at channel deep fade can be deteriorated；The highest by performance good ML detection algorithm complexity, even work as modulation
When subcarrier number that exponent number is higher or each piece is more, ML detection algorithm does not have practicality.For two above shortcoming,
The present invention maps rule by amendment and improves the performance that minimum euclidean distance raising deep fade goes out, and proposes a kind of new inspection accordingly
Method of determining and calculating thus reach ML detection performance while greatly reduce complexity.
Summary of the invention
The present invention is directed to existing SIM-OFDM communication means performance at channel deep fade can be deteriorated, simultaneously receiving end signal detection
The technical problem that complexity is the highest, it is provided that a kind of SIM-OFDM communication means.The method transmitting terminal by improve subcarrier rope
Draw the mapping method of modulation, i.e. introduce a kind of new mapping rule and make between the subcarrier in each sub-block separate, do so
Increase minimum Eustachian distance, thus improve systematic function；At receiving terminal, for the complexity of Maximum Likelihood Detection, this
Bright propose a kind of new frequency domain detection technology, complexity can also be greatly reduced while reaching the performance of Maximum Likelihood Detection.
The whole system link of the present invention is as in figure 2 it is shown, include: digitized information source, deserializer (S/P), index map,
IFFT/FFT, add/go CP module, channel, parallel serial conversion module (P/S), frequency domain equalization (FDE) module, index detection module.
Detailed technology scheme of the present invention is as follows:
A kind of SIM-OFDM communication means, comprises the following steps:
Step 1: produced m=m by digitized information source1+m2Position information bit, and do serioparallel exchange.In the information bit of m position,
Front m1Position is as the index bit of SIM modulation, rear m2M-QAM modulation is done according to the value of order of modulation M in position.Assume son
The total number of carrier wave is N number of, and the subcarrier number of each sub-block is n, selects k subcarrier therein to send data；Then have altogether
There are g=N/n sub-block, m1=p1G, wherein Represent and round downwards；m2=p2G, wherein
p2=klog2 (M).
Step 2: index maps.Index mapping ruler is defined as: N number of subcarrier is divided into g=N/n sub-block, every height
Block contains n subcarrier, n subcarrier in N number of subcarrier in being spacedly distributed or random distribution shape, and adjacent two sons
The band of intercarrier is wider than coherence bandwidth.For g=N/n sub-block, according to p in each sub-block1Value which determines
K subcarrier sends data, and each subcarrier carries a symbol, and each symbol is that log2 (M) individual bit is mapped to one
M-QAM constellation symbols, k subcarrier carries p2Position bit information.
Step 3:OFDM is modulated.Including IFFT, parallel-serial conversion, add CP.
Step 4: information source information, after step 1～3 process, is sent by transmission antenna, and signal is through rayleigh fading channel and Gauss
Receiving terminal is arrived after channel.
Step 5: receiving terminal pretreatment.The signal received is removed CP, serioparallel exchange by receiving terminal, then through FFT to frequency
Territory.
Step 6: frequency domain equalization.
Step 7: demapping.Subcarrier combination corresponding in each sub-block is found according to the index mapping scheme that transmitting terminal is taked,
Find the equilibrium symbol of correspondence according to this combination respectively, recover the symbol ordering relation before indexed mapping, and be combined into
G=N/n equilibrium symbolic blocks.
Step 8: signal detection.Step 7 gained g=N/n equilibrium symbolic blocks is carried out signal detection, each equilibrium symbol
Block signal detection process comprises the steps:
Step 8-1: the data in q (1≤q≤g) the individual equilibrium symbolic blocks after equilibrium are carried out hard decision respectively and is adjudicated
After symbolWhereinFor q-th equilibrium symbolic vector in equilibrium symbolic blocks；
Step 8-2: calculate corresponding two the equilibrium symbolic vector S before and after hard decisionqWithBetween Euclidean distance dq:
Step 8-3: choose u less symbolic vector u of Euclidean distance and carry out next step detection, wherein requirement
k≤u≤n；
Step 8-4: u the symbol obtaining screening, takes k symbol and puts into SqIn constant, other position be 0 obtain new
Vectorial S'qk, then according to formulaChoose one group of Euclidean distance minimum for sending symbol
Number group, thus find modulation symbol vector k the position according to symbol to detect index bit vector I, to modulation symbol vector k
It is modulated symbol de-maps and obtains modulation bit；Wherein q refers to q-th sub-block, YqRefer to q-th that receiving terminal receives
The frequency domain data of block.
The invention has the beneficial effects as follows:
The mapping method that a kind of SIM-OFDM communication means that the present invention provides is modulated by improvement sub-carrier indices at transmitting terminal,
I.e. introduce a kind of new mapping rule and make between the subcarrier in each sub-block separate, do so and increase minimum Eustachian distance,
Thus improve thus improve system BER (Bit Error Ratio) performance；Receiving terminal, answering for Maximum Likelihood Detection
Polygamy, the present invention proposes a kind of new frequency domain detection technology, can also be greatly while reaching the performance of Maximum Likelihood Detection
Reduce complexity.
Accompanying drawing explanation
Fig. 1 is the system block diagram of existing SIM-OFDM communication means.
Fig. 2 is the system block diagram of the SIM-OFDM communication means that the present invention proposes.
Fig. 3 is with n=2, the schematic diagram of index map modulation new as a example by k=1.
Fig. 4 is to index mapping principle figure at equal intervals.
Fig. 5 is random index mapping principle figure.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described, in order to those skilled in the art is more fully understood that this
Invention.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can be desalinated
During the main contents of the present invention, these are described in says here and is left in the basket.
For preferably the present invention will be described, first introduce the term used in technical solution of the present invention and index modulation system is launched
Machine structure.
Send subcarrier combination: refer to first carry out pre-piecemeal in N number of subcarrier of transmitter, each piece has n subcarrier,
Then one have g=N/n sub-block, do not interfere with each other between each sub-block, and each piece is followed identical mapping rule.For each
For sub-block, selecting k subcarrier therein to send data, its remaining sub-carriers is then mourned in silence.For selection scheme according to index ratio
The special index mapping table that combines determines.For wherein any one sub-block, index bit is a length of:
Represent and round downwards, then for the index ofdm system of a frame, one have m1=p1G position index bit；To the son activated
Carrier wave sends M-QAM modulation symbol, and this point is consistent with conventional OFDM systems, for the system that n selects k, permissible
The modulation bit number sending a frame is: m2=p2G, wherein p2=klog2 (M).
Channel matrix: consistent with conventional OFDM systems, if crossed channel is rayleigh fading channel, is then divided by subcarrier,
Frequency selective fading channels can be divided into N number of flat fading channel, and channel matrix can be expressed as:
H=[H1,H2,...,HN]T
Channel submatrix: the channel matrix of the most each sub-block, transmitter and receiver two ends are all according to identical mapping rule, root
Map rule accordingly and can find the t easet ofasubcarriers belonged in same piece, the matrix that corresponding fading coefficients set is formed
Being channel submatrix, first channel submatrix can be expressed as by mapping scheme as shown in Figure 3:
Hq1=[H1,H1+K,...,H1+K*k]T
Communication means system block diagram as shown in Figure 2, transmitting terminal is roughly divided into following a few step:
Step 1: determine the parameter of system to be selected, i.e. determine subcarrier number N, the block number g being divided into, the son of each piece
Variable number n, activates how many subcarrier number k in sub-block, the exponent number M of modulation.Then calculate according to formula as above
These frame data are divided into two groups by the amount of bits of one frame, and one group is index bit, are used for selecting sub-load to send data, and one group is
Modulation bit, sends in the subcarrier in being activated for modulation.
Step 2: modulation bit is mapped to symbol and carries out serioparallel exchange, according to index bit, step 2 in comparison summary of the invention
Symbol is assigned on the subcarrier of correspondence by the mapping method mentioned (Fig. 4, Fig. 5), and position of mourning in silence sets to 0.
Step 3: a frame index mapping symbols is carried out respectively IFFT conversion, parallel-serial conversion, adds CP and send out as sending data
It is shot out.
For receiver section, it is as good as to frequency domain equalization and tradition OFDM from taking CP, the most no longer describes in detail.For inspection
Method of determining and calculating, can detect according to previously described method.
Claims (1)
1. a SIM-OFDM communication means, comprises the following steps:
Step 1: produced m=m by digitized information source1+m2Position information bit, and do serioparallel exchange；In the information bit of m position,
Front m1Position is as the index bit of SIM modulation, rear m2M-QAM modulation is done according to the value of order of modulation M in position；Assume son
The total number of carrier wave is N number of, and the subcarrier number of each sub-block is n, selects k subcarrier therein to send data；Then have altogether
There are g=N/n sub-block, m1=p1G, wherein Represent and round downwards；m2=p2G, wherein
p2=k log2 (M)；
Step 2: index maps；Index mapping ruler is defined as: N number of subcarrier is divided into g=N/n sub-block, every height
Block contains n subcarrier, n subcarrier in N number of subcarrier in being spacedly distributed or random distribution shape, and adjacent two sons
The band of intercarrier is wider than coherence bandwidth；For g=N/n sub-block, according to p in each sub-block1Value which determines
K subcarrier sends data, and each subcarrier carries a symbol, and each symbol is that log2 (M) individual bit is mapped to one
M-QAM constellation symbols, k subcarrier carries p2Position bit information；
Step 3:OFDM is modulated；Including IFFT, parallel-serial conversion, add CP；
Step 4: information source information, after step 1～3 process, is sent by transmission antenna, and signal is through rayleigh fading channel and Gauss
Receiving terminal is arrived after channel；
Step 5: receiving terminal pretreatment；The signal received is removed CP, serioparallel exchange by receiving terminal, then through FFT to frequency
Territory；
Step 6: frequency domain equalization；
Step 7: demapping；Subcarrier combination corresponding in each sub-block is found according to the index mapping scheme that transmitting terminal is taked,
Find the equilibrium symbol of correspondence according to this combination respectively, recover the symbol ordering relation before indexed mapping, and be combined into
G=N/n equilibrium symbolic blocks；
Step 8: signal detection；Step 7 gained g=N/n equilibrium symbolic blocks is carried out signal detection, each equilibrium symbol
Block signal detection process comprises the steps:
Step 8-1: the data in q (1≤q≤g) the individual equilibrium symbolic blocks after equilibrium are carried out hard decision respectively and is adjudicated
After symbolWhereinFor q-th equilibrium symbolic vector in equilibrium symbolic blocks；
Step 8-2: calculate corresponding two the equilibrium symbolic vector S before and after hard decisionqWithBetween Euclidean distance dq:
Step 8-3: choose u less symbolic vector u of Euclidean distance and carry out next step detection, wherein requirement
k≤u≤n；
Step 8-4: u the symbol obtaining screening, takes k symbol and puts into SqIn constant, other position be 0 obtain new
Vectorial S'qk, then according to formulaChoose one group of Euclidean distance minimum for sending symbol
Number group, thus find modulation symbol vector k the position according to symbol to detect index bit vector I, to modulation symbol vector k
It is modulated symbol de-maps and obtains modulation bit；Wherein q refers to q-th sub-block, YqRefer to q-th that receiving terminal receives
The frequency domain data of block.
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