CN108471393A - Shuangzi carrier modulating method and wireless site - Google Patents
Shuangzi carrier modulating method and wireless site Download PDFInfo
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- CN108471393A CN108471393A CN201810106460.0A CN201810106460A CN108471393A CN 108471393 A CN108471393 A CN 108471393A CN 201810106460 A CN201810106460 A CN 201810106460A CN 108471393 A CN108471393 A CN 108471393A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
Abstract
The invention discloses Shuangzi carrier modulating method and wireless sites.The Shuangzi carrier modulating method introduces Shuangzi carrier modulation DCM in high efficiency WLAN.DCM is the solution for handling narrowband interference and range extension.Frequency diversity can be introduced into ofdm system by DCM by sending identical information on two subcarriers being detached in frequency domain.If using DCM, identical coding bit is modulated on the subcarrier of the separation of two frequency domains with identical or different constellation mapping scheme by transmitter.DCM can be influenced by higher peak-to-average power ratio PAPR.According on one side, it is proposed that a method of sending and encode HE PPDU frames using the Shuangzi carrier modulation DCM and lower PAPR of binary phase shift keying BPSK.By the above-mentioned means, the present invention can extend the range of Outdoor Scene and solve the problems, such as that narrowband interferes.
Description
Technical field
The present invention relates to wireless communication fields, more particularly to the Shuangzi carrier modulation in wireless communication system
(dual subcarrier modulation, DCM) and peak-to-average power ratio (peak-to-average power ratio,
PAPR reduction).
Background technology
IEEE 802.11 is one group for realizing WLAN in Wi-Fi (2.4,3.6,5 and 60GHz) frequency band
(wireless local area network, WLAN) communication media access control (media access control,
) and the specification of physical layer (physical layer, PHY) MAC.802.11 series use same basic agreement including a series of
Half-duplex transmission digital modulation techniques.Standard and being changed to is provided the foundation using the radio network product of Wi-Fi frequency bands.Example
Such as, IEEE 802.11ac are the wireless network standards in 802.11 series of IEEE, provide the high-throughput on 5G frequency bands
WLAN.Proposed in IEEE 802.11ac standards significantly broaden channel width (20MHz, 40MHz, 80MHz and
160MHz).Efficient WLAN seminar (High Efficiency WLAN study group, HEW SG) is IEEE 802.11
A seminar in working group, 802.11 working groups of IEEE will consider to be promoted spectrum efficiency to improve wireless device in height
Throughput of system under density scene.Due to the reason of HEW SG, TGax (an IEEE task groups) sets up and is responsible for research
IEEE 802.11ax standards, the standard will take over sb.'s job standard as IEEE 802.11ac.Recently, the demand of WLAN is being permitted
Exponentially increase in the tissue of conglomerate.
Orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple are introduced in HE WLAN
Access, OFDMA) by giving the subset allocation of subcarrier to different users, multiple users to be allowed to be carried out at the same time data biography
It is defeated, to promote user experience.In ofdma, assigned one group of each user is referred to as resource unit (resource
Unit, RU) subcarrier.In HE WLAN, wireless site (station, STA) can transmit in uplink and downlink OFDMA
The RU of minimum dimension (it is about 2MHz bandwidth).Compared with the lead code of its 20MHz, before the power density ratio of data portion
The high 9dB of preamble part.The upgoing O FDMA signals of this narrowband are difficult by CCA (Clear Channel Assessment, the free time
Channel Detection) it detects, because CCA works in the bandwidth more than or equal to 20MHz.Therefore, a STA is in specialized narrowband
It may be interfered by 9dB more than other subcarriers on subcarrier.As can be seen that narrowband interference is intrinsic in HE WLAN.It needs
It wants that the scheme that such narrowband interferes can be handled.
In multi-user (Multi-User, MU) is transmitted, within 1x symbols (symbol) duration to HE-SIG-B into
Row coding.As a result, when using same modulation and encoding scheme (modulation and coding scheme, MCS),
Performance ratio has the data symbol of 4x symbols (symbol) duration poor.HE-SIG-B needs more stable modulation scheme.This
Outside, in order to expand the range of outdoor scene, it is desirable to which a kind of new modulation scheme, the SNR of the SNR ratios MCS0 of new modulation scheme is more
It is low.
Shuangzi carrier modulation (Dual Sub-Carrier Modulation, DCM) is identical in sub-carrier up-regulation system
Information.DCM can upload defeated identical information by two subcarriers detached in frequency domain and frequency diversity is introduced into OFDM
In system.DCM can be realized with low complex degree, and provide the modulation scheme better performance than being used in current WLAN.DCM increases
Strong transmission reliability, especially under narrowband interference.Both Binary Convolutional Code (binary convolutional can be used
Code, BCC) low-density checksum (low-density parity check, LDPC) code can also be used to HE PPDU
The data field of (Presentation Protocol Data Unit, protocol Data Unit) is encoded.Pass through HE PPDU
HE-SIG-A in code field select encoder.
It, can be by height power ratio although DCM has significant improvement in multidiameter fading channel in terms of diversity
The influence of (peak-to-average power ratio, PAPR).Seek the solution of the reduction PAPR at DCM.
Invention content
The invention mainly solves the technical problem of providing low peak-to-average power ratio Shuangzi carrier modulating method and wireless site,
It can solve the problems, such as that narrowband interferes.
One aspect of the present invention provides a kind of Shuangzi carrier modulating method comprising：To OFDM wireless LAN
It is middle to encode the data information for being sent to purpose website by resource unit by Source Site；Use the first binary phase-shift key
The bit of coding is modulated to first group of modulation symbol by control modulation scheme, wherein first group of modulation symbol be mapped to it is described
On the subcarrier of the first part of resource unit；If using Shuangzi carrier modulation, the second binary phase shift keying tune is used
The bit of the same coding is modulated to second group of modulation symbol by scheme processed, wherein second group of modulation symbol is mapped
Onto the subcarrier of the second part of the resource unit；To include first group of modulation symbol and/or second group of tune
The data packet of symbol processed is transferred to the purpose website.
One aspect of the present invention provides a kind of wireless site comprising：Encoder, in OFDM wireless LAN
The data information for being sent to purpose website by resource unit by Source Site is encoded；Modulator uses the first binary system
The bit of coding is modulated to first group of modulation symbol by phase-shift keying (PSK) modulation scheme, wherein first group of modulation symbol is mapped
Onto the subcarrier of the first part of the resource unit；If using Shuangzi carrier modulation, the modulator uses second
The bit of the same coding is modulated to second group of modulation symbol by binary phase shift keying modulation scheme, wherein described second
On the subcarrier for the second part that group modulation symbol is mapped to the resource unit；And transmitter, will include described first
The data packet of group modulation symbol and/or second group of modulation symbol is transferred to the purpose website.
Wherein, the first part of the resource unit is the first half frequency ranges of the resource unit；The resource unit
Second part is the second half frequency ranges of the resource unit, wherein the first half frequency ranges of the resource unit are the resource lists
One of in the upper half frequency range of member and the lower half frequency range of the resource unit；The second half frequency ranges of the resource unit are institutes
State another in the upper half frequency range of resource unit and the lower half frequency range of the resource unit.
Shuangzi carrier modulation (Dual sub-carrier are introduced in high efficiency (high efficiency, HE) WLAN
Modulation, DCM).DCM is the solution for handling narrowband interference and range extension.DCM can be by detaching in frequency domain
Identical information is sent on two subcarriers frequency diversity is introduced into ofdm system.If using DCM, transmitter makes
With identical or different constellation mapping scheme, identical coding bit is modulated on the subcarrier of two frequency domains separation.DCM can be by
To the influence of higher peak-to-average power ratio (peak-to-average power ratio, PAPR).According on one side, propose
It is a kind of to be sent using binary phase shift keying (binary phase shift keying, BPSK) DCM and lower PAPR
With the method for coding HE PPDU frames.In one embodiment, the first BPSK modulation schemes are used for the bits of coded in data packet
Member is mapped on the subcarrier of lower half frequency range；2nd BPSK modulation schemes be used to reflect the identical coding bit in data packet
Be mapped on the subcarrier of upper half frequency range, wherein the frequency of the subcarrier of upper half frequency range it is higher than the frequency of the subcarrier of lower half frequency range or
Person is lower than the frequency of the subcarrier of lower half frequency range.The first and second BPSK modulation schemes are designed to realize low PAPR.Show at one
In example, first group of modulation symbol is by snIt indicates, second group of modulation symbol is by smIt indicates, wherein n and m are sub-carrier indices, and sm
=sn*ej*(pi)*m。
In one embodiment, wireless Source Site is in orthogonal frequency division multiplexing (orthogonal frequency
Division multiplexing, OFDM) in WLAN by resource unit (RU) to purpose will be transferred to from Source Site
The data information of website is encoded.The bit of coding is modulated to first group of modulation by Source Site using the first BPSK modulation schemes
Symbol, wherein first group of modulation symbol is mapped on the subcarrier of the first half frequency ranges of RU, the first half frequency ranges of wherein RU can
To be one of them in the upper half frequency range of RU and the lower half frequency range of RU.If using Shuangzi carrier modulation (DCM), Source Site makes
The bit of identical coding is modulated to second group of modulation symbol with the 2nd BPSK modulation schemes, wherein second group of modulation symbol quilt
It is mapped on the subcarrier of the second half frequency ranges of RU, the second half frequency ranges of wherein RU can be the upper half frequency range of RU and the lower half of RU
Another in frequency range.Data packet comprising first group of modulation symbol and/or second group of modulation symbol is sent to purpose by Source Site
Website.
By the present invention in that the coding bit in data packet to be mapped to the of resource unit with the first BPSK modulation schemes
Identical coding bit in data packet is mapped to resource unit by a part of frequency sub-carrier using the 2nd BPSK modulation schemes
Second part frequency sub-carrier, i.e., identical coding bit is mapped in different sub-carrier, in this way narrowband interference when
It waits, can select that there is the signal on the subcarrier of preferable SNR subsequently calculate and handle, therefore can effectively solve the problem that narrowband
The problem of interference.
Other embodiment and advantage are described in the following detailed description.The content of present invention, which is not used in, limits this hair
It is bright.The present invention is defined by the claims.
Description of the drawings
Fig. 1 is wireless communication system and high efficiency HE of the support with the PAPR DCM transmission reduced according to one aspect
PPDU frame structures；
Fig. 2 is the simplified block diagram of wireless device according to one aspect；
Fig. 3 is the transmission dress of application dual carrier modulation (dual carrier modulation, DCM) according to one aspect
The rough schematic view set；
Fig. 4 is for the DCM for reducing peak-to-average power ratio (peak-to-average power ratio, PAPR)
BPSK modulates the example of mapping scheme；
Fig. 5 corresponds to the cumulative distribution function (cumulative of the PAPR of different BPSK modulation schemes
Distribution function, CDF)) example；
Fig. 6 is the rough schematic view using the reception device of DCM demodulation and demappings；
Fig. 7 is transmission according to one aspect and encodes the stream of the method for the PAPR HE PPDU frames with DCM and reduction
Cheng Tu.
Specific implementation mode
Now with detailed reference to some embodiments of the present invention, its example is shown in the drawings.
Fig. 1, which is support according to one aspect, to be had the PAPR that reduces (peak-to-average power ratio, peak is equal
Power ratio) DCM (dual carrier modulation, dual carrier modulation) transmission wireless communication system 100 and high efficiency
HE PPDU frame structures.Cordless communication network 100 includes wireless access point AP 101 and wireless site STA102.It is in wireless communication
In system, wireless device is communicated between each other by various clearly defined frame structures.Frame includes physical layer convergence program
(Physical Layer Convergence Procedure, PLCP) protocol Data Unit (PPDU), frame head and payload.
Frame is divided into very specific and standard part successively.In Fig. 1, efficient (high efficiency, HE) PPDU frames 110
It is transferred to STA 102 from AP101.HE PPDU 110 include conventional short training field (legacy short training
Field, L-STF) 111, conventional long training field (legacy long training field, L-LTF) 112, conventional signaling
Field (legacy signal field, L-SIG) 113 repeats conventional signaling field (repeat legacy signal
Field, RL-SIG) 114, efficient signaling A fields (HE signal A field, HE-SIG-A) 115, efficient signaling B field
(HE signal B field, HE-SIG-B) 116, efficient short training field (HE short training field, HE-
STF) 117, for the efficient long training field (HE long training field, HE-LTF) 118 and 119 of data, efficiently
Data load 120 and data packet extend (Packet Extension, PE) 121.
Orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple are introduced in HE WLAN
Access, OFDMA), by assigning the subset of subcarrier to different users, multiple users to be allowed to be carried out at the same time data transmission
To enhance user experience.In ofdma, assigned one group of each user is referred to as resource unit (resource unit, RU)
Subcarrier.In HE WLAN, STA can transmit the RU of minimum dimension in upgoing O FDMA (it is about 2MHz bandwidth).
Compared with the lead code of its 20MHz, the high 9dB of power density ratio preamble portion of data portion.This narrowband upgoing O FDMA
Signal is difficult to be detected by CCA.It therefore, may be more than other subcarriers by 9dB on subcarriers of the STA on specific narrowband
Interference.As can be seen that narrowband interference is intrinsic in HE WLAN.Therefore it needs to handle the scheme that narrowband interferes.In addition,
In the case of dense deployment, robustness when in face of narrowband interference is extremely important for HE WLAN.Enhance HE data portions
PER performances can extend the range of Outdoor Scene.Need to propose the new modulation system for HE data, can than
It is operated under the lower SNR of SNR of MCS0.Similarly, it is desired to the more steady modulation scheme for HE-SIG-B.
Therefore, Shuangzi carrier modulation (dual sub-carrier modulation, DCM) is introduced in HE WLAN.DCM
It is the perfect solution for handling narrowband interference.DCM can be by transmitting same letter on the subcarrier that two frequency domains detach
Cease pull-in frequency diversity in an ofdm system.Transmission for single user, DCM schemes modulate phase on sub-carrier a n and m
Same information, that is, 0<n<NSD/ 2 and m=NSD/ 2+n, wherein NSDIt is the sum of a resource unit sub-carriers.For OFDMA
Transmission, a frequency resource block is assigned to given user.For a frequency chunks DCM schemes with for single user
OFDM schemes it is identical.DCM indication schemes can be applied, in this way for the coding and decoding of DCM all very simples.In Fig. 1
Shown, HE SIG-A 115 or HE SIG-B 116 MCS subfields and DCM including instruction MCS, the DCM is used to indicate
Whether DCM is that the user is applied to subsequent HE SIG-B 116 or subsequent data payloads 120, if DCM is used
And be instructed to, then it is equivalent on the subcarrier that the AP101 of transmitter is detached using different mapping schemes at two and modulates HE
The identical coding bit (bit) of PPDU110.In receiver-side, STA102 receives HE PPDU 110, indicates MCS and DCM
Position is decoded, and correspondingly executes demodulation and decoding.
Because being grasped by inverse fast Fourier transform (Inverse Fast Fourier Transformation, IFFT)
Many subcarrier components are added to, transmission signal there can be peak value in time domain in ofdm system.As a result, when and single carrier
When system is compared, ofdm system be considered to have higher peak-to-average power ratio (peak-to-average power ratio,
PAPR).When DCM is used, although it on multi-path fading channels there is significant diversity to improve, it is by high PAPR
Influence.According on one side, the Shuangzi in the case where selecting DCM carries wave modulation and mapping scheme to reduce PAPR.
Fig. 2 is the simplified block diagram of wireless device 201 and wireless device 211 according to one aspect.For wireless device 201
(for example, transmitting device), antenna 207 and 208 transmit and receive radio signal.RF transceiver modules 206,207 He of coupling antenna
208, the RF signals from antenna 207 and 208 are received, baseband signal is converted into and sends it to processor 203.RF is received
Hair module 206 also converts the baseband signal from processor 203 received, is converted into RF signals and sends it to day
Line 207 and 208.Processor 203 handles the baseband signal received and calls different function modules and circuit wireless to realize
The function of device 201.Memory 202 stores program instruction and data 210 to control the operation of wireless device 201.
Similarly, for wireless device 211 (for example, reception device), the transmission of antenna 217 and 218 and reception RF signals.RF
Transceiver module 216, coupling antenna 217 and 218 receive the RF signals from antenna 217 and 218, are converted into baseband signal
And send it to processor 213.RF transceiver modules 216 also convert the baseband signal from processor 213 received, by it
It is converted to RF signals and sends it to antenna 217 and 218.Processor 213 handles the baseband signal received and calls difference
Function module and circuit realize the function of wireless device 211.Memory 212 stores program instruction and data 220 to control
The operation of wireless device 211.
Wireless device 201 and wireless device 211 further include that several can be used and configure to execute the embodiment of the present invention
Function module and circuit.In the illustrated example shown in fig. 2, wireless device 201 be include encoder 205, symbol mapper/modulation
The transmitting device of device 204 and OFDMA modules 209.Wireless device 211 be include decoder 215, symbol de-mapper/demodulation
The reception device of device 214 and OFDMA modules 219.It should be noted that a wireless device can be transmitting device simultaneously and connect
Receiving apparatus.Different function modules and circuit can be applied and be configured by software, firmware, hardware and its arbitrary combination.When
When executing (for example, by executing program code 210 and 220) by processor 203 and 213, function module and circuit are allowed for
The wireless device 201 of transmission and for reception wireless device 211 execute the embodiment of the present invention.
In one example, in transmitter side, wireless device 201 generates HE PPDU frames, and by MCS and DCM indicating bits
It is inserted into the signal field of HE PPDU frames.Wireless device 201 then using corresponding MCS and DCM and is sent out HE PPDU
Give receiver.In receiver-side, wireless device 211 receives the HE PPDU, and decodes MCS and DCM indicating bits.If DCM
Indicating bit is 0, then receiver calculates the log-likelihood ratio of the bit received based on indicated MCS for each subcarrier
(logarithm likelihood ratio, LLR).On the other hand, if DCM indicating bits are 1, receiver is by executing money
The combination of the LLR of the subcarrier of the upper half frequency range of source unit and the subcarrier of lower half frequency range calculates LLR.It will tie below now
Close the various embodiments that attached drawing describes this transmitting device and reception device.
Fig. 3 is shown using the simplification of the transmitting device 300 of dual carrier modulation (dual carrier modulation, DCM)
It is intended to.The coding of the RU exported by encoder/interleaver 301 and the bit of intertexture are sent to DCM constellations
(constellation) in mapper 302.Encoder 301 can be LDPC encoder or BCC decoder, wherein BCC interweaves
Device is located at before or after BCC decoder.DCM constellations (constellation) mapper 302 utilizes possible different mapping
Identical coding bit is modulated on the subcarrier that scheme is detached at two.For example, as shown in Figure 3, subcarrier n and subcarrier m
Carry identical order information.Subcarrier n is the subcarrier in the lower half frequency range of RU and uses mapping scheme #1, subcarrier m
Be RU upper half frequency range in subcarrier and using mapping scheme #2, wherein the subcarrier in lower half frequency range is than upper half frequency range
In subcarrier frequency it is low or higher than the frequency of the subcarrier in upper half frequency range.Then, modulated signal is mapped to
On the data subcarrier of RU, it is then sent to IFFT 303 and is transmitted.Usually, it may be predetermined that be used for two frequencies of DCM
Rate subcarrier.For example, in order to maximize frequency diversity, if n is subcarrier k, m is subcarrier k+ (N/2), and wherein N is to use
The sum of subcarrier in an OFDM symbol (symbol) of data transmission or RU.
Fig. 4 is for the DCM for reducing peak-to-average power ratio (peak-to-average power ratio, PAPR)
BPSK (binary phase shift keying, binary phase shift keying) modulates the example of mapping scheme.Assuming that subcarrier n
S is used respectively with the modulated signal of subcarrier mnAnd smIt indicates.It, can be by identical or different at two for the BPSK with DCM
BPSK constellations on map the coding bit b of 1 bit0To obtain snAnd sm.According to one side, the symbol s of modulationnAnd smIt can be with
By using BPSK mapping scheme #1 and BPSK mapping schemes #2 to map the coding bit b of 1 bit respectively0To obtain.Selection
#1 and BPSK scheme #2 are so that s for BPSK schemesm=± (sn).For example, BPSK DCM mapping schemes can be：
sn=1-2b0 (1)
sm=(1-2b0)ejmπ (2)
In the example depicted in fig. 4, identical coding bit element flow is modulated and is respectively mapped to by DCM constellation mappers
On the subcarrier of the lower half frequency range of resource unit RU 400 and the subcarrier of upper half frequency range, wherein the subcarrier of upper half frequency range
Frequency is higher than the frequency of the subcarrier of lower half frequency range or the frequency of subcarrier than lower half frequency range is low.Make NSDFor a resource list
The quantity of data subcarrier in position (RU).For encoding bit element flow, when being modulated using DCM, then DCM constellation mappings are used
Device.For example, coding bit be modulated to plural number first half, and be mapped to the lower half frequency range of RU data subcarrier [1,
2、...、NSD/2].Coding bit is replicated and is modulated to the latter half of plural number, and is mapped to the data of the upper half frequency range of RU
Subcarrier [NSD/2+1、NSD/2+1、...、NSD]。
In the next generation wlan system based on upcoming IEEE801.11ax standards, each website
(station, STA) can use one or more resource units (resource unit, RU) to transmit signal.RU sizes can
To be 26,52,106,242,484 or 996 subcarriers (tone), subcarrier spacing is about 78.1kHz.The plural number of generation will
It is mapped to the data subcarrier and the second half frequency ranges of the first half frequency ranges (being referred to as first half frequency range) of the frequency range of RU
The data subcarrier of (being referred to as second half frequency range).First half frequency range of RU includes that subcarrier 1 arrives subcarrier NSD/ 2,
And second half frequency range of RU includes subcarrier NSD/ 2 arrive subcarrier NSD, wherein NSDIt is RU sizes.
According on one side, the data packet that will be transmitted is reduced for the DCM of BPSK modulation schemes proposed
PAPR.According to the value of sub-carrier indices m, s it can be seen from equation (1) and (2)mIt is snIt is multiplied by+1 or -1.If m is even number,
So sm=sn；If m is odd number, sm=-sn.By the operation it is found that the PAPR of ofdm signal is substantially reduced.In general,
The PAPR of signal x (t) is defined as：
PAPR=max [x (t) * conj (x (t))]/E [x (t) * conj (x (t))]
In one example, in order to calculate the PAPR of data packet, following steps are executed：1) generate length be 4K bytes with
Machine binary data；2) using IEEE 802.11ax transmitter modulations data to generate complex sample (complex sample)
Time series.Time samples are sampled with 20MHz；3) PAPR is the ratio of maximum sampled power divided by mean power.If multiple
Number Sequence is T and length is N, then：
The power of each samples of Pt=T*conj (T)-
AvgPt=sum (Pt)/N- mean powers
MaxPt=max (Pt)-maximum power
PAPR=maxPt/avgPt
PAPR (dB)=10*log10 (maxPt/avgPt)
Fig. 5 corresponds to the cumulative distribution function (cumulative of the PAPR of different BPSK modulation schemes
Distribution function, CDF)) example.Since the PAPR of each data packet is different, in Fig. 5
Shown in example, calculate the PAPR of 10,000 data packet, draw the CDF of the PAPR corresponding to different modulation schemes.It uses
Three kinds of different modulation schemes.In the first modulation scheme, non-DCM BPSK are used；In the second modulation scheme, with without
The DCM BPSK of mapped specific；In third modulation scheme, the DCM BPSK with the mapped specific proposed are used.
Non- DCM BPSK are modulated, as shown in solid-line curve, average PAPR is about 7.25dB.DCM BPSK are modulated,
Data are replicated and modulate under conditions of not using Special Mapping, for example, for positioned at lower half frequency range subcarrier and position
It is mapped using same BPSK in the subcarrier of upper half frequency range.As shown in dashed dotted-line, average PAPR is about 8.5dB, high
It is modulated in non-DCM BPSK.For the DCM BPSK with the mapped specific proposed, using the first #1 pairs of BPSK mapping schemes
Then sub-carrier modulation data in lower half frequency range replicates the subcarrier-modulated of upper half frequency range with the 2nd BPSK mapping schemes #2
Data.As shown in imaginary curve, average PAPR is in close proximity to the PAPR of non-DCM BPSK modulation schemes.
Fig. 6 is the rough schematic view using the reception device 600 of DCM demodulation and demappings.At receiver, pass through FFT
601 reception signal can be written as：
rn=hnsn+vn--- the subcarrier of upper half frequency range
rm=hmsm+vm--- the subcarrier of lower half frequency range
Wherein
-hnAnd hmIt is the channel response matrix of subcarrier n and m
-vnAnd vmIt is modeled as AWGN (additive white Gaussian noise, Additive White Gaussian Noise) noise
If the SNR of the subcarrier of upper half frequency range and the subcarrier of lower half frequency range is considered as " good ", receiver
De-mapping device/demodulator 602 can be by combining the reception of the subcarrier of subcarrier and lower half frequency range from upper half frequency range to believe
Number calculate receive bit log-likelihood ratio (logarithm likelihood ratio, LLR).Optionally, if lower half
The SNR of the subcarrier of frequency range, which is considered as " bad " receiver, can select to calculate the reception of the subcarrier from upper half frequency range
Signal calculates the LLR of the bit received, if the SNR of the subcarrier of upper half frequency range is considered as " bad ", receiver can select
Select the LLR for receiving signal and calculating the bit received for calculating the subcarrier from lower half frequency range.Demodulated signal is subsequently sent to
Decoder 603 is to export decoded signal.
Fig. 7 is transmission according to one aspect and encodes the stream of the method for the PPDU frames of the PAPR HE with DCM and reduction
Cheng Tu.In step 701, wireless Source Site encodes data information, by it in orthogonal frequency division multiplexing
Pass through resource unit in (orthogonal frequency division multiplexing, OFDM) WLAN
(resource unit, RU) is transmitted to purpose website by wireless Source Site.In a step 702, Source Site using the one or two into
Phase-shift keying (PSK) (binary phase shift keying, BPSK) modulation scheme processed is modulated to first group of modulation by bit is encoded
Symbol, wherein first group of modulation symbol is mapped to frequency of the first half frequency ranges (being referred to as first half frequency range) of RU
Carrier wave, wherein the first half frequency ranges can be one in the upper half frequency range of RU or the lower half frequency range of RU.In step 703, such as
Fruit modulates (dual carrier modulation, DCM) using dual carrier, then Source Site will using the 2nd BPSK modulation schemes
Same coding bit is modulated to second group of modulation symbol, wherein second group of modulation symbol is mapped to the second half frequency ranges of RU
The frequency sub-carrier of (being referred to as second half frequency range), wherein the second half frequency ranges can be the upper half frequency range or RU of RU
Lower half frequency range in another.In step 704, the data packet comprising modulation symbol is transferred to purpose website by Source Site.
In one example, first group of modulation symbol is by snIt indicates, second group of modulation symbol is by smIt indicates, wherein n and m are subcarrier ropes
Draw, and sm=sn*ej*(pi)*m。
It is different from the prior art, the present invention is introducing DCM in HE WLAN, and two sons that DCM can be detached in frequency domain carry
Identical information is sent on wave.The son that coding bit in data packet is mapped to lower half frequency range with the first BPSK modulation schemes carries
On wave；The identical coding bit in data packet is mapped on the subcarrier of upper half band frequency with the 2nd BPSK modulation schemes,
It can solve the problems, such as narrowband interference in this way and extend the range of Outdoor Scene.
Although for the purpose of introduction, the present invention is described in conjunction with certain specific embodiments, but the invention is not restricted to this.Cause
This, can execute the various modifications to the various features of described embodiment, reorganization and combinations thereof, be wanted without departing from such as right
Seek the scope of the present invention described in book.
Claims (17)
1. a kind of Shuangzi carrier modulating method, which is characterized in that including：
To the data information of purpose website will be sent in OFDM wireless LAN by resource unit by Source Site
It is encoded；
The bit of coding is modulated to first group of modulation symbol using the first binary phase shift keying modulation scheme, wherein described
On the subcarrier for the first part that one group of modulation symbol is mapped to the resource unit；
If using Shuangzi carrier modulation, use the second binary phase shift keying modulation scheme by the position of the same coding
Member is modulated to second group of modulation symbol, wherein second group of modulation symbol is mapped to the second part of the resource unit
On subcarrier；
Data packet comprising first group of modulation symbol and/or second group of modulation symbol is transferred to the point of destination
Point.
2. Shuangzi carrier modulating method according to claim 1, which is characterized in that second group of modulation symbol is equal to institute
It states first group of modulation symbol and is multiplied by+1 or -1.
3. Shuangzi carrier modulating method according to claim 1, which is characterized in that first group of modulation symbol is carried for son
The s of wave nn, second group of modulation symbol is the s for subcarrier mm, wherein sm=sn*ej*(pi)*m, n and m are subcarrier rope
Draw.
4. Shuangzi carrier modulating method according to claim 1, which is characterized in that selection the first binary phase-shift key
Modulation scheme and the second binary phase shift keying modulation scheme are controlled to reach the first peak-to-average power ratio.
5. Shuangzi carrier modulating method according to claim 4, which is characterized in that if using non-Shuangzi carrier modulation
The second peak-to-average power ratio is obtained, and second peak-to-average power ratio is substantially identical as first peak-to-average power ratio.
6. Shuangzi carrier modulating method according to claim 4, which is characterized in that if the first binary phase-shift key
It is identical with the second binary phase shift keying modulation scheme to control modulation scheme, then obtains the second peak-to-average power ratio, and described the
Two peak-to-average power ratios are higher than first peak-to-average power ratio.
7. Shuangzi carrier modulating method according to claim 1, which is characterized in that it is described carry out coding include：Using low
Density parity check channel control coding, encodes the data information；
Alternatively,
It is described carry out coding include：Using the Binary Convolutional Code encoder before Binary Convolutional Code interleaver, to the number
It is believed that breath is encoded.
8. Shuangzi carrier modulating method according to claim 1, which is characterized in that the first part of the resource unit is
The first half frequency ranges of the resource unit；The second part of the resource unit is the second half frequency ranges of the resource unit,
In, the first half frequency ranges of the resource unit are in the upper half frequency range of the resource unit and the lower half frequency range of the resource unit
One of；The second half frequency ranges of the resource unit are under the upper half frequency range and the resource unit of the resource unit
Another in half frequency range.
9. Shuangzi carrier modulating method according to claim 3, which is characterized in that the difference of the n and m is N/2, wherein N
For the sum of the subcarrier in the resource unit.
10. a kind of wireless site, which is characterized in that including：
Encoder, to the number of purpose website will be sent in OFDM wireless LAN by resource unit by Source Site
It is believed that breath is encoded；
The bit of coding is modulated to first group of modulation symbol by modulator using the first binary phase shift keying modulation scheme,
Described in first group of modulation symbol first part for being mapped to the resource unit subcarrier on；
If using Shuangzi carrier modulation, the modulator uses the second binary phase shift keying modulation scheme by same institute
The bit for stating coding is modulated to second group of modulation symbol, wherein second group of modulation symbol is mapped to the resource unit
On the subcarrier of second part；And
Data packet comprising first group of modulation symbol and/or second group of modulation symbol is transferred to described by transmitter
Purpose website.
11. wireless site according to claim 10, which is characterized in that second group of modulation symbol is equal to described first
Group modulation symbol is multiplied by+1 or -1.
12. wireless site according to claim 10, which is characterized in that for subcarrier n, first group of modulation symbol is sn,
For subcarrier m, second group of modulation symbol is sm, wherein sm=sn*ej*(pi)*m, n and m are sub-carrier indices.
13. wireless site according to claim 10, which is characterized in that the first binary phase shift keying modulation scheme
It is chosen so as to reach the first peak-to-average power ratio with the second binary phase shift keying modulation scheme.
14. wireless site according to claim 10, which is characterized in that if being used if non-Shuangzi carrier modulation
Two peak-to-average power ratios are obtained, and second peak-to-average power ratio is substantially identical as first peak-to-average power ratio.
15. wireless site according to claim 14, which is characterized in that if first binary phase shift keying is modulated
Scheme is identical with the second binary phase shift keying modulation scheme, then the second peak-to-average power ratio is obtained, and second peak
Equal power ratio is higher than first peak-to-average power ratio.
16. wireless site according to claim 10, which is characterized in that the encoder includes low-density checksum letter
Road controls encoder, for using low-density checksum channel control coding, being encoded to the data information；
Alternatively, the encoder include Binary Convolutional Code interleaver before Binary Convolutional Code encoder, the binary system
Encoder for convolution codes encodes the data information.
17. wireless site according to claim 10, which is characterized in that the first part of the resource unit is the money
The first half frequency ranges of source unit；The second part of the resource unit is the second half frequency ranges of the resource unit, wherein described
The first half frequency ranges of resource unit be in the upper half frequency range of the resource unit and the lower half frequency range of the resource unit wherein
One；The second half frequency ranges of the resource unit are the upper half frequency range of the resource unit and the lower half frequency range of the resource unit
In another.
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| US15/422,755 | 2017-02-02 | ||
| US15/422,755 US10225122B2 (en) | 2016-02-04 | 2017-02-02 | Low PAPR dual sub-carrier modulation scheme for BPSK in WLAN |
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Also Published As
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| CN108471393B (en) | 2021-10-15 |
| TWI653862B (en) | 2019-03-11 |
| TW201830937A (en) | 2018-08-16 |
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