CN110177064A - One kind being based on environment backscatter communication system low complex degree receiver design method - Google Patents

One kind being based on environment backscatter communication system low complex degree receiver design method Download PDF

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CN110177064A
CN110177064A CN201910519252.8A CN201910519252A CN110177064A CN 110177064 A CN110177064 A CN 110177064A CN 201910519252 A CN201910519252 A CN 201910519252A CN 110177064 A CN110177064 A CN 110177064A
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label
signal
channel
receiver
communication system
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CN110177064B (en
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梁应敞
张右右
张倩倩
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0238—Channel estimation using blind estimation
    • 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

Abstract

The invention belongs to fields of communication technology, are related to a kind of based on environment backscatter communication system low complex degree receiver design method.Semi-blind channel estimation algorithm proposed by the present invention does not depend on the frame structure or environment frequency pilot sign of environmental signal, it only relies on reception signal and environmental signal order of modulation carrys out estimating channel information, recycle the corresponding channel of the different transmission symbols of frequency pilot sign differentiation of limited label.Distance detection algorithm is easy to operate, and channel information and reference channel information that estimation obtains are compared, and takes what is be closer to be assumed to be corresponding demodulation label signal, reference channel is the estimation channel of frequency pilot sign label.Also, in time-domain signal frame structure proposed by the present invention, the period of label signal, which is greater than environmental signal, can be effectively reduced the influence of noise when estimating channel.The beneficial effects of the present invention are: can effectively promote receiver performance while reducing Receiver Complexity.

Description

One kind being based on environment backscatter communication system low complex degree receiver design method
Technical field
The invention belongs to field of communication technology, it is related to the half of a kind of backscatter communication system based on flat fading channel Blind receiver design method.
Background technique
The it is proposed of environment backscatter communication technology solves traditional backscatter communication system, such as radio frequency identification (RFID) system, the high consumption of Bistatic (dual station) backscatter system, low-energy-efficiency problem.The technology utilizes ambient enviroment In radiofrequency signal as carrier wave, label receives carrier signal, and the energy for collecting a part of signal is used to meet tag circuit It works normally.Label changes the amplitude and phase of reflection signal, the information of itself is loaded into carrier wave by adjusting direct impedance Upper and backscattering is to receiver.The environmental signal that receiver receives environmental signal and modulated by label signal, and pass through Detection algorithm demodulates label signal.The mode of environment backscatter communication neither influences existing communication system, further through passive The mode of formula communication has saved energy consumption, is the important technology of Internet of Things network communication system.Known to traditional channel estimation method requires Signal pilot information is sent, environmental signal is depended on, cannot be used directly in environment backscatter communication system.Existing detection is calculated Method is broadly divided into two classes: energy measuring and the detection based on machine learning, the former is simple to operation but accuracy in detection is poor, the latter Detection performance is good but needs iterative learning parameter.The receiver design of environment backscatter communication system should balanced algorithm complexity Degree and performance because the big connection performance of Internet of things system is needed in view of energy consumption problem, and will meet label signal detection Bit error rate requirement.
Summary of the invention
The present invention is based on environment backscatter communication systems, as shown in Figure 1, system is by transmitter, label and receiving mechanism At three equipment all configure single antenna.In order to label signal be demodulated to come, this hair to environmental signal total blindness The bright semi-blind channel estimation and distance detection algorithm proposed for flat fading channel.Semi-blind channel estimation proposed by the present invention Algorithm does not depend on the frame structure or environment frequency pilot sign of environmental signal, only relies on reception signal and environmental signal order of modulation is come Estimating channel information recycles the corresponding channel of the different transmission symbols of frequency pilot sign differentiation of limited label.Distance detection is calculated Method is easy to operate, and channel information and reference channel information that estimation obtains are compared, and takes what is be closer to be assumed to be accordingly Demodulation label signal, reference channel be frequency pilot sign label estimation channel.
It is phase-shift keying (PSK) (MPSK) that semi-blind channel estimation and distance detection algorithm proposed by the present invention, which are applied to environmental signal, Flat fading channel system when modulation, M are order of modulation.Transmitter is to the channel of label and receiver, label in figure one Channel to receiver all obeys sharp keen decline.Fig. 2 show the frame structure diagram of environment mpsk signal and label signal, environment letter Number and the sampling rate ratio of label signal be L, i.e. label signal remains unchanged within the period of L environmental signal.Label uses Binary system on off keying (OOK), and two frequency pilot signs are first sent before sending data symbol.
Receiver is in the corresponding L reception signal slot of n-th of label symbol period, the reception signal of first of time slot It can be expressed as:
Wherein, label signal c (n) is used as baseband modulation signal, and α indicates the reflection coefficient of label, PsRepresent environmental signal Power, sl(n) indicate that first of environmental signal corresponding with label signal c (n), f indicate transmitting terminal to the low pass of receiver Channel impulse response, g indicate label to the low pass channel impulse response of receiver, the low pass channel of v expression transmitting terminal to label Impulse response, ul(n) the passband noise of receiver end is referred to.
L reception symbol corresponding to one label symbol is expressed as vector form, as follows:
It can be obtained by above-mentioned formula, the difference that label signal sends 0 or 1 is the difference of channel, and observation Fig. 1 can be obtained, be marked Label have sent two pilot tone c (0)=0 and c (1)=1 before sending the information, with two kinds of channels of marking: h0And h1.The present invention It proposes using the M power of channel as estimation parameter, by the corresponding estimated value of label data symbol and marked two kinds with reference to letter Road estimated value compares, and selects label symbol corresponding to more like channel as court verdict.Decision rule is as follows:
Receiver is in the corresponding L reception signal slot of n-th of label symbol period, the reception signal of first of time slot It can be expressed as:
yl(n)=hsl(n)+ul(n)
Because the M power of environmental signal phase is 2 π m, and exp (j2 π m)=1, m=1 ..., M, so environmental signal pair The influence of phase can be eliminated, so receiving the M power of signal are as follows:
[yl(n)]M=[hsl(n)+ul(n)]M=[h]M+εl(n)
Wherein, εlIt (n) is the combination of error term, i.e. noise and cross term.The present invention is by [yl(n)]MRegard [h] asMEstimation Value enablesThe estimated value of channel M power is averaged on L reception signal, to reduce the influence of noise, I.e.The frequency pilot sign of label signal is c (0)=0 and c (1)=1, is enabledWithFor reference channel Estimated value.The decision rule of distance detection is equivalent to the point regarded channel estimation value as in plane when flat fading channel, compares The distance between Plane-point is to make judgement.
The beneficial effects of the present invention are: can effectively promote receiver performance while reducing Receiver Complexity.
Detailed description of the invention
Fig. 1 is the system block diagram of environment backscatter communication system of the present invention；
The frame structure block diagram of environment mpsk signal and label signal when Fig. 2 is flat fading channel；
Fig. 3 is bit error rate performance of the receiver design scheme proposed by the present invention in flat fading channel.
Specific embodiment
The scheme of Summary is preferred forms of the invention, and details are not described herein.Below by emulation As a result the performance of transceiver that the present invention designs is verified.
It is performance of the distance detector proposed by the present invention in flat fading channel if Fig. 3 shows.Distance detection (DD) is compared Estimate the distance between channel, flat fading channel is a plural number in receiver single antenna, between DD is more plural away from From.Assuming that environmental signal is QPSK modulation, label signal is that OOK is modulated, and the period ratio of label signal and environmental signal is L= 50, receiver is single antenna.Performance be shown as direct link be averaged SNR and label signal detection the bit error rate relationship.Emulation knot Fruit shows the increase with reflection link signal-to-noise ratio, and the detection bit error rate of label signal decreases, because reflection link has more More energy.

Claims (1)

1. one kind is based on environment backscatter communication system low complex degree receiver design method, the backscatter communication system Transmitter, label and receiver including configuring single antenna；The method is when phase-shift keying (PSK) is modulated for environmental signal Flat fading channel system, order of modulation M, in backscatter communication system transmitter to the channel of label and receiver, The channel of label to receiver all obeys sharp keen decline, and the sampling rate ratio of environmental signal and label signal is L, i.e. label signal It is remained unchanged within the period of L environmental signal；It is characterized in that, which comprises
Enable receiver in the corresponding L reception signal slot of n-th of label symbol period, the reception signal table of first of time slot Up to formula are as follows:
Wherein, label signal c (n) is used as baseband modulation signal, and α indicates the reflection coefficient of label, PsIndicate the function of environmental signal Rate, sl(n) indicate that first of environmental signal corresponding with label signal c (n), f indicate the low pass channel punching of transmitted from transmitter to receiver Swash response, g indicates label to the low pass channel impulse response of receiver, the low pass channel impulse sound of v expression transmitter to label It answers, ul(n) the passband noise of receiver end is referred to；
Label uses binary system on off keying, i.e. transmission symbol non-zero i.e. 1, by L reception symbol corresponding to a label symbol It is expressed as vector form:
Label is enabled to send two frequency pilot sign c (0)=0 and c (1)=1 before sending the information, with two kinds of channels of marking: h0With h1, using the M power of channel as estimation parameter, by the corresponding estimated value of label data symbolWith two kinds of marked references Channel estimation valueWithIt compares, selects label symbol corresponding to more like channel as court verdict:
Wherein,[yl(n)]M=[hsl(n)+ul(n)]M, h is channel.
CN201910519252.8A 2019-06-17 2019-06-17 Low-complexity receiver design method based on environment backscattering communication system Active CN110177064B (en)

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