CN106301693A - A kind of wireless signal modulation method based on codebook mapping - Google Patents
A kind of wireless signal modulation method based on codebook mapping Download PDFInfo
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- CN106301693A CN106301693A CN201510264410.1A CN201510264410A CN106301693A CN 106301693 A CN106301693 A CN 106301693A CN 201510264410 A CN201510264410 A CN 201510264410A CN 106301693 A CN106301693 A CN 106301693A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0612—Space-time modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0625—Transmitter arrangements
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Abstract
The invention discloses a kind of wireless signal modulation method based on codebook mapping, comprise the steps: that transmitting terminal and receiving terminal determine the time frequency point quantity for transmitting bit sequence jointly；Before transmission, this bit sequence is divided into the first bit sequence and the second bit sequence by transmitting terminal；When launching, the second bit sequence according on codebook mapping to corresponding time frequency point, is modulated by transmitting terminal by the first bit sequence at the enterprising row number of time frequency point.Bit sequence, by introducing time and the two-dimentional resource of frequency, is mapped in the selection of time frequency point by the present invention, and complexity is substantially reduced, and the utilization ratio of network spectrum is also obviously improved.
Description
Technical field
The present invention relates to a kind of wireless signal modulation method, particularly relate to a kind of based on codebook mapping
Wireless signal modulation method, belongs to wireless communication technology field.
Background technology
In a wireless communication system, in order to make digital signal transmit in band-limited high frequency channel,
Digital signal must be carried out carrier modulation.Baseband signal is the original signal of telecommunication, generally refers to base
This signal waveform, then refers to corresponding electric pulse in digital communication.Digital modulation is by base-band digital
Signal moves the high frequency band being more suitable for transmission, and digital information is loaded into high frequency carrier certain simultaneously
In one parameter, thus realize signal regeneration at receiving terminal.Compared with analog-modulated, digital modulation
Have that capacity of resisting disturbance is strong, be prone to encryption, strong security, be easy to the advantages such as digital information processing,
But it is relatively wide to band requirement, and quantization error can be brought when carrying out analog/digital conversion,
The technology and equipment asked is more complicated.
On the other hand, during space-modulation technique is MIMO (multiple-input, multiple-output) technology except spatial reuse,
A Ge Xin branch outside space diversity and wave beam forming.It utilizes multiple antennas to be transmitted, but often
Secondary all of antenna can't be used to launch, but therefrom select one or more antenna to carry out
Transmitting, sequence number finished in advance by the antenna chosen, and each different sequence number represents one section of bit
Sequence, is transmitted the symbol of modulation by the antenna chosen by signal constellation (in digital modulation) figure, real
On border, a bit part for transmission is to be mapped in antenna serial number, and another part is actual at wireless sky
Between transmission signal constellation (in digital modulation) figure modulation after symbol.Although space-modulation technique is to utilize multiple antennas,
But be actually equivalent to single-antenna transmission at radio-frequency module, power consumption can be reduced, but the most single
But the lifting of transfer rate has been had for antenna technology.Further, owing to actually employing single antenna
Transmission, it is to avoid the interference between antenna, improves system error performance.
Although space-modulation technique has in performance relative to V_BLAST (demixing time space) technology
Certain advantage, but it is harsher to the requirement of antenna amount.Antenna amount need be 2 n
Power, the most at least needs two transmitting antennas.Further, in the case of antenna amount increase is more,
Transfer rate can't linear increase so that the application prospect of this technology is subject to certain restrictions.
Further, since the erroneous judgement of antenna serial number can cause all error in data, its detection complexity is the most relative
Higher.
The paper " Spatial Modulation " delivered at R.Y.Mesleh et al. (is published in
IEEE Trans.Veh.Technol., Jul.2008, pp:2228-2241.) in, will swash
The sequence number launching antenna of living, as a modulation variable, sets up input bit corresponding with antenna serial number
Mapping relations.This input bit is divided into two parts, and a part launches the sequence number of antenna in order to determine,
Another part carries out constellation point modulation, and in each moment, the antenna being only selected just transmits data,
And other antennas are temporarily in idle condition.It addition, in Chinese invention patent CN101547181B,
Disclose the construction method of a kind of QAM constellation label.QPSK planisphere is replicated and puts down respectively by it
Move in four quadrants of complex plane, produce 16QAM planisphere, be iterated forming 2n+2Rank QAM
Planisphere；The label of definition constellation point is made up of 2n+2 bit, and the most front 2 bits correspond to star
The 2 of seat point place2nThe quadrant that QAM constellation is positioned at, rear 2n bit then complex plane quadrant it
Between present symmetry rule.Bit sequence is modulated by this invention by planisphere, and
It is not involved with the mapping of time frequency point set and bit sequence.
Development along with digital modulation technique, it is desirable to people constantly search for band efficiency high,
The new type of modulation mode that capacity of resisting disturbance is strong simultaneously, time-frequency modulation (time frequency
Modulation) technology is arisen at the historic moment.Time-frequency modulation is a kind of physical layer modulation technology, specifically
Refer in a binary system or multi-system element duration, to the carrier wave of several different frequencies and
The process that its shared time location is controlled simultaneously.It actually successively goes out with multiple frequencies
Existing order carries out coding to represent digital information.Many owing to can transmit in a symbol time
Individual frequency, time-frequency modulation technique can play the effect of mitigating frequency-selective fading, and its effect is equivalent to
Frequency diversity, therefore has preferable Anti-Jamming.
In Chinese patent application CN101699808A, disclose a kind of differential encoding space time-frequency modulation
Method.In the method, terminal carries out Space Time Coding to sending bit, generates unitary matrice code word sequence
Row, carry out differential modulation to it, generate armed matrix sequence, then be respectively mapped to spatial domain,
In time domain and frequency domain, obtain one group of sky time-frequency three dimensional signal.But, wherein the collection of time frequency point merges
Do not carry any bit sequence, the most do not carry out the mapping relations of time frequency point set and bit modulation,
And it is the use of OFDM modulation method.
Summary of the invention
For the deficiencies in the prior art, the technical problem to be solved is to provide a kind of base
Wireless signal modulation method in codebook mapping.The method is by code book transmission time frequency point set and ratio
The mapping relations of special sequence, can promote the utilization ratio of network spectrum.
For realizing above-mentioned goal of the invention, the present invention uses following technical scheme:
A kind of wireless signal modulation method based on codebook mapping, it is characterised in that comprise the steps:
Transmitting terminal and receiving terminal determine the time frequency point quantity for transmitting bit sequence jointly；
Before transmission, described bit sequence is divided into the first bit sequence and the second bit sequence by transmitting terminal
Row；
Launch time, transmitting terminal by described first bit sequence according to codebook mapping to correspondence time-frequency
On point, the second bit sequence is modulated at the enterprising row number of described time frequency point.
The most more preferably, described transmitting terminal and described receiving terminal safeguard described code book, described code jointly
Originally include the mapping relations between time frequency point set and bit sequence, described time frequency point set include to
A few time frequency point, described time frequency point is selected from described time frequency point set.
The most more preferably, described second bit sequence described first bit sequence obtain described time
The modulation of frequency enterprising row number and transmission.
The most more preferably, described bit sequence is entered by described transmitting terminal according to described time frequency point quantity
Row segmentation, each segmentation includes described first bit sequence and described second bit sequence.
The most more preferably, the bit number that described transmitting terminal and described receiving terminal transmit every time is:
The most more preferably, described first bit sequence includes Q bit,
Wherein, N is the total number of described time frequency point, and n is for transmitting the time frequency point that data select
Number, N and n is the natural number more than or equal to 1.
The most more preferably, at described transmitting terminal, described first bit sequence is not entered by physical channel
Row transmission.
The most more preferably, at described receiving terminal, look for by the signal intensity received is carried out detection
Go out to carry the time frequency point of data, compare described code book based on described time frequency point and obtain the first bit sequence,
And carry out detecting and demodulation obtains the second bit sequence in described time frequency point.
The most more preferably, at described receiving terminal, select first n and receive the time frequency point that signal energy is the strongest,
Count the set of the time frequency point of data transmission, then compare the described code preset in described receiving terminal
The bit sequence that this lookup is corresponding, wherein, described n represents that described transmitting terminal is common with described receiving terminal
The time frequency point quantity for transmitting bit sequence determined.
The most more preferably, described time frequency point is time and the two-dimentional resource of frequency composition.
Compared with prior art, the present invention has a following technical characterstic:
(1) detection to time-frequency modulation has only to simple energy measuring or Energy-aware can be complete
Becoming, its complexity is relatively low, and the time frequency point of carrying data is few compared with traditional method, thus from entirety
On can reduce the complexity of detection；
(2) in some cases transfer rate can be had a certain upgrade, thus promote network spectrum
Utilization ratio；
(3) by selection and the adjustment of parameters of code book, different transmission rates can be met
Communicating requirement；
(4) time frequency point not all in the present invention is all in transmission data, to a certain extent may be used
To avoid monkey chatter.
Accompanying drawing explanation
Fig. 1 is the signal processing schematic diagram of transmitting terminal in the present invention；
Fig. 2 is the signal processing schematic diagram of receiving terminal in the present invention；
Fig. 3 (a) is the two-dimensional representation schematic diagram of time frequency point set, and Fig. 3 (b) is time frequency point set
One-dimensional representation schematic diagram；
Fig. 4 is the schematic diagram that bit stream carries out segmentation modulation.
Detailed description of the invention
With specific embodiment, technical scheme is done the most below in conjunction with the accompanying drawings
Explanation.
In one embodiment of the invention, emphasis considers that LTE (includes but not limited to TD-LTE
And FDD-LTE) time-frequency modulation problems in system.But it is self-evidently, provided by the present invention
Technological thought also be able to apply in other uses the wireless communication system of MIMO technology, such as
MIMO-OFDM, WCDMA or HSDPA etc..
It is known that time and frequency are the ultimate unit (money constituting resource grid in LTE system
Source particles).On this basis, inventor proposes traditional digital modulation to be expanded at time and frequency
The method that is modulated in the two-dimensional space that rate is constituted, implements thinking as follows: by base station end and
Subscriber equipment (base station end and subscriber equipment are mutually as transmitting terminal and the receiving terminal of wireless signal) is altogether
With safeguarding an identical code book (Codebook).This code book substantially associate matrix
(being again unitary matrice), stores bit sequence and the mapping relations of time frequency point set in the codebook.?
Transmitting terminal, it would be desirable to the bit sequence of transmission is divided into two parts, a part of bit sequence to pass through code book
In mapping relations, be mapped as correspondence time frequency point, these part data the most do not pass through thing
Reason channel is transmitted, and remaining a part of bit sequence passes through letter in the aforementioned time frequency point mapped out
Number planisphere is modulated and transmits.Correspondingly, it is also classified into two parts at receiving terminal to detect.
At receiving terminal by signal intensity detects the time frequency point finding out carrying data, comparison code book obtains
To the first corresponding bit sequence, and carry out detecting and signal constellation (in digital modulation) in the time frequency point of carrying data
Figure demodulation obtains the second bit sequence, and two parts bit sequence combination obtains original transmitting data.
Below the ins and outs of the present invention are described in detail.
Fig. 1 and Fig. 2 is respectively in the present invention, the signal processing signal of transmitting terminal and receiving terminal
Figure.Before transmitting, transmitting terminal and receiving terminal are jointly selected time frequency point number and are transmitted for data.Launch
Time, transmitting terminal according to selected time frequency point number, by the first bit sequence according to code book carry out mapping (time
Frequency modulation system), obtain time frequency point；Second bit sequence is modulated (example at the enterprising row number of this time frequency point
Such as BPSK).Transmitting terminal transmits the data obtained through digital modulation in this time frequency point.
Here, be firstly introduced into a time-frequency mapping step (or time-frequency mapper), its effect be
Transmitting terminal realizes the packet to bit stream and part packet is carried out time-frequency modulation, and by another
Partial bit packet is mapped to the time frequency point by codebook selecting by modulation systems such as signal constellation (in digital modulation) figures
In time frequency point in set.Correspondingly, a corresponding time-frequency demapping step is introduced at receiving terminal
(or time-frequency de-mapping device), it is the inverse mapping of time-frequency mapping step (or time-frequency mapper), logical
Cross lookup code book, it is achieved the conversion of time frequency point set to bit sequence.An enforcement in the present invention
In example, the two-dimentional resource that time and frequency are constituted being referred to as time frequency point, time frequency point can be (but not
It is limited to) resource particle in Resource Block in LTE system.It should be noted that above-mentioned time-frequency
Mapping step and time-frequency demapping step can use special IC to realize (being such as fabricated to specially
The time-frequency mapper of door and time-frequency de-mapping device), it is also possible to software mode in general purpose microprocessor
Realize.These are all the conventional meanses that those of ordinary skill in the art can grasp, the most not quite clear at this
Describe in detail clear.
In one embodiment of the invention, binary source signal maps to the time-frequency as transmitting terminal
Device exports binary bit groupings.Assume transmitting terminal and receiving terminal can (N be by time frequency point quantity N
Natural number) be 4, can the situation of corresponding 2 time slot 2 frequencies, transmitting terminal is determined in advance with receiving terminal
From 4 time frequency point, selection 1 or 2 time frequency point are transmitted, code book corresponding in the case of being somebody's turn to do
Can be calculated by table 1 or table 2.
The code book example of table 1 n=1
The code book example of table 2 n=2
In one embodiment of the invention, it is assumed that signal constellation (in digital modulation) figure be modulated to BPSK modulation, and
And have 4 time frequency point.Before transmitting, transmitting terminal and receiving terminal jointly determine for transmit data time
Frequency quantity, the present embodiment selects 1 frequency, therefore this wireless communication system from 4 frequencies
The amount of bits can transmitted altogether is:
Bit
During transmitting, bit sequence is divided into the first bit sequence and the second bit sequence by transmitting terminal, will
After bit signal source is grouped, one of them is armed is grouped into, and { 101} selects front Q=2
Bit carries out time-frequency modulation as the first bit sequence.By search code book (reference table 1), time
Frequency point sets knows in selecting that the time frequency point of 10 correspondences is 3, during for 2 time slot 2 frequency,
Namely first frequency of the second time slot.Therefore, transmitting terminal using time frequency point 3 as carrying data
Time frequency point launch.
Transmitting terminal by ensuing for the first bit sequence nB=1 × 1=1 bit, the i.e. second bit sequence,
For-1 after being modulated by BPSK, then these modulation data are sent by selected time frequency point 3
Go out.
Shown in Figure 2, at the time-frequency de-mapping device as receiving terminal, at front N, (N is certainly for we
So number, N=4 in one embodiment of the invention) individual time frequency point selects to receive signal energy
1 big time frequency point), it is readily obtained time frequency point 3 and is the time frequency point of carrying data.Need explanation
, because transmitting terminal and receiving terminal are it has been determined that the time frequency point number of carrying data is 1 before launching,
So receiving terminal only need to receive 1 time frequency point that energy is maximum from multiple time frequency point.If launched
Front transmitting terminal is with receiving terminal it has been determined that time frequency point number is multiple, and such as 2, then receiving terminal needs
2 time frequency point that energy is maximum are received from 4 time frequency point.
As the time-frequency de-mapping device of receiving terminal, receive time frequency point 3, by comparison code book, search
The bit sequence obtaining time frequency point 3 correspondence is 10.Owing to before launching, transmitting terminal is the most true with receiving terminal
Regularly frequency points is 1, thus receiving terminal knows that transmitting terminal can transmit is 3 bits.Receiving terminal is
It is 10 (bit sequences of time frequency point 3 correspondence) through going out the first two bit according to codebook mapping, will be right
An ensuing bit, is demodulated by signal constellation (in digital modulation) figure and existing signal detection technique,
Bit in time frequency point 3 is 1, thus has obtained launching packet { 101} at receiving terminal.
The above-mentioned simple case being only used to auxiliary understanding and enumerate.It practice, it is all right
It is transmitted by the time frequency point selecting different code books or varying number, it is achieved various different
Emission rate.For example, it is possible to optimize various parameter (such as N, n, M according to the size of portfolio
Deng), use suitable transfer rate to improve communication efficiency；Can also carry out adaptive according to the actual requirements
Should adjust, the most reasonably use the communication resource.Below this is launched tool in detail
The explanation of body.
As shown in Fig. 3 (a), it is assumed that each time-frequency block one has N=k × j time frequency point, uses respectively
A1～ANRepresent.In actual applications, portion may be caused because inserting pilot tone or other information
Timesharing frequency can not transmitting data information, here N represent altogether can time frequency point quantity.Every time
N time frequency point transmission data are selected, then one has from time-frequency blockPlant and select combination, these groups
Close and at most needIndividual bit represents.Wherein, Q is that the first bit sequence maps
Bit number, N is the time frequency point number total amount in described time frequency point set, and n is for being used for transmitting data
And the time frequency point number selected, N and n is natural number.
Owing to Q is rightRound downwards the natural number obtained,There may be
Data are not transmitted in few time-frequency point set, but this on mapping relations entirely without impact, even
Provide some optionally to combine more.
Before address, base station end and subscriber equipment (i.e. the transmitting terminal of wireless signal and receiving terminal) point
And Pei Zhi jointly not safeguard an identical code book.In the codebook, different time frequency point correspond to not
Same bit sequence.For given time frequency point sum N, transmitting terminal and receiving terminal therefrom select n
Individual time frequency point transmission data, then for each n=1 ..., N, a code book can be built.?
In above-mentioned Tables 1 and 2, have been presented for codebook paradigm during n=1 and n=2.Chat for convenience
State, at this, two-dimensional representation dimensionality reduction of time frequency point sequence number is described to one-dimensional, as shown in Fig. 3 (b).
It should be noted that time frequency point set and the mapping relations of bit sequence are self-defined to work out,
And with unrestricted choice and self-adaptative adjustment, but base station end and subscriber equipment (transmitting terminal can be required
With receiving terminal) keep consistent.
By the time frequency point set carried in code book and the mapping relations of bit sequence, select time
Frequency point sets also carries data message, referred to as time-frequency and modulates to distinguish over traditional signal constellation (in digital modulation) figure
Modulation system.And for traditional signal constellation (in digital modulation) figure modulation system, such as M rank QAM modulation, often
Individual modulation symbol carrying B=log2M bit, wherein, M represents that order of modulation, B represent modulation ratio
Special number, say, that B bit can be transmitted in each time frequency point.Transmitting terminal and receiving terminal determine in advance
Required time frequency point number n (n is identical with receiving terminal at transmitting terminal, for preset value) of data transmission,
And signal constellation (in digital modulation) figure modulation system (i.e. M value), transmitting terminal obtains the ratio of segmentation according to below equation
Special number (transmitted bit number):
Therefore, once there is one group of bit stream pending in transmitting terminal, first according to above-mentioned formula (1)
The segmentation bits number obtained, is one group by this bit stream with Q+nB bit and carries out segmentation, and
The first bit sequence in each segmentation and these two parts of the second bit sequence are modulated respectively,
As shown in Figure 4, by front Q bit (the first bit sequence) according to codebook mapping be time frequency point (i.e.
Carry out time-frequency modulation), by rear nB bit (the second bit sequence) signal constellation (in digital modulation) figure modulation methods
Formula carries out digital modulation.Digital modulation data are transmitted in the time frequency point that time-frequency is modulated, at other
Time frequency point does not carries out data transmission.
Transmitting procedure in the channel is identical with routine techniques means, and transmitting signal can experience channel and decline
The impact fallen.Correspondingly, receiving terminal is also classified into two parts to the solution mediation detection of signal and completes, its
A middle part is the data (the first bit sequence) of time-frequency modulation, and another part is the number of digital modulation
According to (the second bit sequence).Seeing Fig. 4, receiving terminal is according to n value, n before selecting during detection
The time frequency point that individual reception signal energy is the strongest, the code book preset by transmitting terminal, find out front Q ratio
Special.These partial bit data simply have selected the set of time frequency point, and actual
Transmission.Then in the time frequency point selected, number is completed by traditional signal constellation (in digital modulation) figure modulation system
Word modulated process, obtains remaining nB bit.Finally, front Q bit is obtained with nB bit combination
Data to transmission.
Data for time-frequency modulation, it is only necessary to carry out time-frequency modulatedemodulate according to code book and map.
When implementing, corresponding operation can be completed by simple energy measuring or Energy-aware,
Its complexity is relatively low.This is because only at the time frequency point transmitting data selected in the present invention,
Other time frequency point in addition to the time frequency point of transmission data do not have data transmission.Do not transmit data
Time frequency point on reception signal it is believed that only noise, its energy is the lowest.Therefore connecing
Receiving end, what reception signal energy in each time frequency point was higher its is possible to transmit data, one
Determine can avoid in degree monkey chatter.During detection, it is only necessary to select first n and receive signal
The time frequency point that energy is the strongest, the i.e. corresponding time frequency point having carrying data.It is then possible to count
There is the set of the time frequency point that data transmit.Compare the bit of the code book lookup correspondence that transmitting terminal is preset again
Sequence (the first bit sequence), when can complete, the solution of frequency modulation is in harmonious proportion and detects.So compare
In traditional method, needing the data carrying out detecting to reduce, complexity reduces the most accordingly, thus from whole
The complexity of signal detection can be reduced on body.
For the data of digital modulation, can be according to existing signal detection algorithm, to corresponding time-frequency
Carrying data on point are demodulated and detect demodulating the second bit sequence, do not go to live in the household of one's in-laws on getting married at this
State.Sequentially combine before and after the first bit sequence that demodulation is obtained and the second bit sequence and just obtain
Transmitted raw data.
In order to present invention advantage in transfer rate is described, below our citing to every time transmission
Data volume is analyzed.Assume in a time-frequency block that one has 9 time frequency point and may be used for transmitting number
According to, traditional method is defined as in each time frequency point transmitting data, below we be given selection difference
The time frequency point of quantity is transmitted the comparative result of the transmission quantity with traditional method.It is assumed herein that constellation
Figure modulation system is BPSK modulation.
Traditional method can transmit a BPSK symbol in 9 time frequency point respectively, each
BPSK symbol comprises log22=1 bit, then the method can transmit altogether 9 × 1=9 bit.Assume
The present invention selects 8 time frequency point to be transmitted, it is provided that wireless signal modulation method at 8 time-frequencies
A BPSK symbol, i.e. 8 bits, the bit sequence that time frequency point set is corresponding can be transmitted respectively on Dian
Row compriseBit, can transmit altogether 11 bits.
The transmission quantity in the case of selection varying number time frequency point can be calculated in the method, such as table 3
Shown in.
The volume of transmitted data of 3 two kinds of methods of table compares (time frequency point sum is 9, and BPSK modulates)
As can be seen here, by selecting suitable time frequency point, the wireless signal modulation side that the present invention provides
System transfer rate can be had a certain upgrade by method, thus promotes the utilization ratio of network spectrum.And
And, owing to this wireless signal modulation method has only to judge just can examine to signal energy height
Measure part mapping bit sequence in time frequency point.The remaining data volume needing traditional detection,
Fewer than the data volume of traditional technique in measuring, the complexity of detection has the reduction of certain amplitude.Along with
The decline of selected time frequency point number, although transmission quantity is more relatively low than traditional method in some cases,
But detection complexity has and significantly reduces.
In theory, different from the present embodiment, the second bit sequence can be reflected by transmitting terminal according to code book
It is mapped to time frequency point (the first bit sequence being equivalent in the present embodiment), the first bit sequence is carried out
Digital modulation.Receiving terminal respective change.
Compared with prior art, wireless signal modulation method provided by the present invention introduces the time
With the two-dimentional resource of frequency, being mapped in the selection of time frequency point by bit sequence, complexity drops significantly
Low, the utilization ratio of network spectrum is also obviously improved.If it addition, code book being taked necessity
Encryption measures, the present invention can also be used in the design of secret signalling.
Above wireless signal modulation method based on codebook mapping provided by the present invention is carried out in detail
Thin explanation, it is apparent that the form that implements of the present invention is not limited thereto.This technology is led
For the those skilled in the art in territory, in the situation without departing substantially from spirit and claims of the present invention scope
Under various obvious change that it is carried out all within protection scope of the present invention.
Claims (11)
1. a wireless signal modulation method based on codebook mapping, it is characterised in that include walking as follows
Rapid:
Transmitting terminal and receiving terminal determine the time frequency point quantity for transmitting bit sequence jointly,
Before transmission, described bit sequence is divided into the first bit sequence and the second bit sequence by transmitting terminal
Row；
Launch time, transmitting terminal by described first bit sequence according to codebook mapping to correspondence time-frequency
On point, the second bit sequence is modulated at the enterprising row number of described time frequency point.
2. wireless signal modulation method as claimed in claim 1, it is characterised in that:
Described transmitting terminal and described receiving terminal safeguard that described code book, described code book include time frequency point jointly
Mapping relations between set and bit sequence, described time frequency point set includes at least one time frequency point,
Described time frequency point is selected from described time frequency point set.
3. wireless signal modulation method as claimed in claim 1, it is characterised in that:
Described second bit sequence is enterprising in the described time frequency point obtained according to described first bit sequence
Row number modulation and transmission.
4. wireless signal modulation method as claimed in claim 1, it is characterised in that:
Described transmitting terminal carries out segmentation according to described time frequency point quantity to described bit sequence, each
Segmentation includes described first bit sequence and described second bit sequence.
5. wireless signal modulation method as claimed in claim 4, it is characterised in that described transmitting terminal
The bit number every time transmitted with described receiving terminal is:
6. wireless signal modulation method as claimed in claim 5, it is characterised in that:
Described first bit sequence includes Q bit,
Wherein, N is described time frequency point total quantity, and n selects for being used for transmitting described bit sequence
Time frequency point quantity, N and n is natural number.
7. wireless signal modulation method as claimed in claim 1, it is characterised in that:
Described code book is an associate matrix.
8. wireless signal modulation method as claimed in claim 1, it is characterised in that:
At described transmitting terminal, described first bit sequence is not transmitted by physical channel.
9. the wireless signal modulation method as described in claim 1,7 or 8, it is characterised in that:
At described receiving terminal, find out carrying data by the signal intensity received is detected
Time frequency point, compares described code book based on described time frequency point and obtains the first bit sequence, and when described
Frequency carries out detecting and demodulation obtains the second bit sequence.
10. wireless signal modulation method as claimed in claim 9, it is characterised in that:
At described receiving terminal, select first n and receive the time frequency point that signal energy is the strongest, then comparison is described
The described code book preset in receiving terminal searches corresponding bit sequence, and wherein, described n represents described and sends out
Penetrate the time frequency point quantity for transmitting bit sequence that end determines jointly with described receiving terminal.
11. wireless signal modulation methods as claimed in claim 10, it is characterised in that:
Described time frequency point is time and the two-dimentional resource of frequency composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264410.1A CN106301693B (en) | 2015-05-21 | 2015-05-21 | A kind of wireless signal modulation method based on codebook mapping |
Applications Claiming Priority (1)
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| WO2022126303A1 (en) * | 2020-12-14 | 2022-06-23 | Qualcomm Incorporated | Wireless communications based on rateless codes and layered modulation |
| CN116016086A (en) * | 2022-08-08 | 2023-04-25 | 南通芯盟测试研究院运营管理有限公司 | Time-frequency modulation method |
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