CN105553511B - A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses - Google Patents
A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses Download PDFInfo
- Publication number
- CN105553511B CN105553511B CN201510980793.2A CN201510980793A CN105553511B CN 105553511 B CN105553511 B CN 105553511B CN 201510980793 A CN201510980793 A CN 201510980793A CN 105553511 B CN105553511 B CN 105553511B
- Authority
- CN
- China
- Prior art keywords
- band
- sub
- interference
- narrow
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/719—Interference-related aspects
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A kind of multi-band orthogonal mutual-complementing code radio ultra wide band system disturbance restraining method based on non-linear Sqrt Chirp pulses, UWB frequency ranges are divided in transmitting terminal, obtain L different sub-bands, corresponding Chirp pulses are matched and set according to whether there is narrow-band interference signal in each sub-band, it is possible to achieve high speed and multi -rate transmission.The present invention is designing and used non-linear Sqrt Chirp pulses in sub-band existing for narrow-band interference signal, the instantaneous frequency that it can be maximum by arrowband disturb residing for frequency band, significantly more efficient suppression arrowband interference effect, while realize the suppression of more arrowbands interference.The present invention is based on the good correlation properties of orthogonal complementary code, band spectrum modulation is carried out to each sub-band Chirp pulses, multi-access inference between user, interference and multi-path jamming between sub-band can be eliminated, suppress and eliminate, the antijamming capability and communication performance of effective lifting system while realizing a variety of interference.
Description
Technical Field
The invention relates to a method for suppressing interference of a multiband orthogonal complementary code ultra-wideband system based on nonlinear Sqrt Chirp pulses, and belongs to the technical field of wireless communication.
Background
Ultra-wideband (UWB) technology has attracted more and more attention in academia and industry because of its advantages of low transmission power, easy implementation, strong anti-interference capability, high multipath resolution, and the like. Ultra wideband technology can provide high speed and reliable data transmission between portable electronic devices and communication devices over short distances. The characteristics enable the ultra-wideband technology to have wide application prospect in the fields of wireless communication, radar, accurate positioning and the like, and especially have incomparable advantages in indoor short-distance high-speed wireless communication.
The extremely wide bandwidth and the extremely low transmission power of the UWB signal determine that the UWB signal is inevitably interfered by other narrowband communication systems, so a narrowband interference (NBI) suppression technology must be adopted to solve the problem of coexistence of the ultra-wideband system and the narrowband system, which is one of research hotspots of the ultra-wideband technology. At present, many researches on the influence of narrow-band interference on a UWB system and a suppression method have been made. H.B.Shen et al (see H.B.Shen, W.H.Zhang, and K.S.KWak, "Modified chip waves in coherent UWB system," in Proc.ICC Workshos' 08, pp.504-507, may.2008.) design nonlinear chip pulses to suppress narrow-band interference using the concept of spectral avoidance. Based on the Chirp function characteristic, the method can change the corresponding frequency domain characteristic only by time domain processing, thereby achieving the purpose of inhibiting the narrow-band interference, but only considering the inhibition of single narrow-band interference. Liu et al (see W.Liu, W.X.Zou and F.M.Xu, et al, "A Novel Frequency-band Coded Orthogonal UWB chip Pulse Design for coherent NBI supression," Microwave, antenna EMC, propagation and Technologies for Wireless Communications, pp.1048-1051, 2007) divides the UWB band into a number of sub-bands, encodes the sub-bands with a pseudo-random (PN) sequence such that Chi pulses of the sub-bands are Orthogonal, thereby avoiding interference between multiple users. The method adopts PN codes, and the Chirp pulses of each sub-band of each user have orthogonality, so that the system design is complex and the multipath interference of the system cannot be effectively reduced. C.Wang et al (see C.Wang, M.D.Ma, R.D.ying and Y.H.Yang, "Narrowband Interference suppression in DS-UWB systems," IEEE Signal Processing Letters, vol.17, no.5, pp.429-432, 2010.) introduce the encoding-aided Interference suppression technology into a direct sequence spread-spectrum ultra-wideband (DS-UWB) system for the first time, and propose a novel spread-spectrum sequence for suppressing Narrowband Interference, but the operation process for obtaining the sequence is complicated. The spreading codes adopted in the traditional DS-UWB system are all single codes (such as m sequences, walsh codes, gold sequences and the like), and researches show that the single codes cannot simultaneously have ideal autocorrelation and cross-correlation characteristics, so that the single-code-based UWB system has limited anti-interference capability. The orthogonal complementary code adopted by the invention is a composite code sequence different from a single code, is formed by a group of element codes, and has ideal correlation characteristics, namely the sidelobe of an autocorrelation function and a cross-correlation function are zero. Due to the ideal correlation characteristics of the orthogonal complementary codes, it has been widely noticed and studied in CDMA systems. Chen et al studied orthogonal complementary code based CDMA systems (see h.h.chen, s.w.chua and m.guizani, "On next generation CDMA technologies: the REAL ap-pro-ach for The perfect orthogonal code generation," IEEE trans.on Vehicular Technology, vol.57, pp.2822-2833, 2007), which can completely eliminate multipath and multiple access interference and can achieve multi-rate transmission using a stack Offset (OS) modulation scheme. Existing ultra-wideband systems lack design flexibility in terms of design to combat multiple narrowband interference, multipath, and multiple access interference, and are difficult to achieve simultaneous suppression and cancellation of the typical interference described above.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a method for suppressing the interference of a multiband orthogonal complementary code ultra-wideband system based on nonlinear Sqrt Chirp pulses.
The technical scheme of the invention is as follows:
a multi-band orthogonal complementary code ultra-wideband system interference suppression method based on nonlinear Sqrt Chirp pulses is disclosed, wherein the ultra-wideband system comprises a group of transmitting nodes and a single target terminal, the group of transmitting nodes comprises a plurality of transmitting nodes, each transmitting node corresponds to a user, the transmitting nodes and the target terminal are respectively provided with a single antenna, and the transmitting nodes send multi-user signals to the target terminal through a wireless multi-path channel; the signal that the purpose terminal receives comes from useful signal, other UWB user signal that the transmitting node group sent, and many narrowband interference signal, sub-band interference signal, multipath signal and Gaussian white noise signal that exist in the channel environment, the specific step of the said interference suppression method is as follows:
A. the UWB communication system is ready to begin operation;
B. UWB communication system utilizes spectrum sensing technology to obtain frequency of multiple narrow-band interference signals in communication environmentBelt (f) l(j) , f h(j) ) And corresponding center frequency f (j) ，j∈(1,2,…,N)，f l(j) And f h(j) Respectively is the lower limit frequency and the upper limit frequency of the jth narrow-band interference signal, and N is the number of narrow-band interference signals in the communication environment;
C. the bandwidth of an available frequency band of the UWB communication system is divided into L sub-bands according to the frequency band position of the narrow-band interference signal, each sub-band is allocated with an OCC code, and each sub-band is matched and provided with a corresponding Chirp pulse w i (t), i ∈ (1, 2, \8230;, L), and L>N；
D. Let UWB communication system have K users altogether, { C 1 ,C 2 ,…,C K Is an orthogonal complementary sequence set, the OCC of the kth user isM is the number of element codes of OCC of the kth user, and each element codeContaining N c Spreading each sub-band by using OCC codes;
E. according to the number of the sub-frequency bands, data bits are transmitted in groups of L bits, converted into L branches in a serial-parallel mode and transmitted in parallel on the corresponding L sub-frequency bands; each branch circuit is subjected to OCC (optical code carrier) spread spectrum and then multiplied by Chirp pulses determining respective frequency bands, and each Chirp pulse modulated by a spread spectrum code is characterized byWhereinThe nth data bit sent for the kth user,is the jth chip of the ith element code of the user k; let 1 st user be the desired user, 2 nd to k th usersIs τ = η T, and the time delay between the last arrival path of the 1 st user and the first arrival path of the 1 st user is τ = η T c + ζ of whichZeta-distribution over [0, T ] c ]，T c Is the duration of each chip, and the duration of each element code is T p ＝(N c +η+1)T c ；
F. The method comprises the steps that an information source sends data bits, the data bits are represented through Chirp pulses modulated by OCC spread spectrum, the data bits are transmitted through L parallel branches, then all sending signals are superposed together and transmitted into a multi-path channel through an antenna, and except for multi-path fading, other user UWB signals and additive white Gaussian noise in a narrow-band system and a UWB communication system which coexist with a UWB system generate interference on UWB signals of an expected user and commonly appear in a receiving signal;
G. at a receiving end, processing a received signal r (t) in each sub-frequency band by adopting a Rake receiver, wherein the Rake receiver comprises F correlators, and the correlators integrate the product of the received signal r (t) and a template signal m (t);
H. within the l sub-band, the received signal r (t) is correlated with a corresponding template signal m (t), the output decision variable of which is Z l ，Z l ＝S U +S I +S M +S P +S F +S n In which S is U As a useful signal component, S I As narrow-band interference components, S M For multiple access interference components, S P As a multipath interference component, S F For sub-band interference terms, S n Is an additive white gaussian noise term;
I. according to the steps, the output decision variable Z of the Rake receiver in the ith sub-band of the user k is obtained kl And judging by adopting a maximum likelihood criterion to obtain an average error probability expression of the UWB communication system, wherein the average error probability expression is as follows:
whereinF is the number of fingers of the Rake receiver, the number of correlators is the same as the number of fingers of the Rake receiver, w f As a weighting factor for the f-th correlator, P (Z) kl < 0| '1') refers to the probability that a transmission symbol is 1 and is misjudged to be 0, P (Z) kl > 0| '0') refers to the probability that a transmission symbol of 0 is misjudged as 1;
J. when the transmission of the data bit is completed, the communication is ended.
According to the invention, in the step C, each sub-band matching sets a corresponding Chirp pulse w i The method (t) is specifically as follows:
1) Detecting a narrow-band interference band by using a spectrum sensing technique, providing a narrow-band interference signal, and determining the UWB band (f) l ,f h ) Divided into three sections, i.e. (f) l ,f 1 )、(f 1 ,f 2 ) And (f) 2 ,f h )，f l And f h Respectively the lower limit frequency and the upper limit frequency of the UWB band, each sub-band bandwidth is more than 500MHZ, and a narrow-band interference signal is arranged in the 2 nd sub-band (f) 1 ,f 2 ) Internal;
2) In the ith (i =1, 3) sub-band without narrow-band interference signal, a linear Chirp pulse w with the waveform center at t =0 is adopted i (t)＝p(t)cos[2π(f 0 +iB i )t+πμt 2 ]P (t) is the envelope of each subband and when | t>, T/2 p (T) =0, T is signal period, mu is sweep rate, B i Is the bandwidth of the ith sub-band;
3) In a sub-band (f) where a narrow-band interference signal is present 1 ,f 2 ) In the method, a nonlinear Chirp pulse for effectively inhibiting narrow-band interference is designed: in the sub-frequency band, according to the time-frequency mapping relation of Chirp pulse, obtaining the lower limit frequency f of the narrow-band interference signal l(1) Corresponding to the time point T fra ＝T(f l(1) -f 1 )/B’，B’＝(f 2 -f 1 )-(f h(1) -f l(1) ) For the corrected frequency bandwidth, the time-frequency corresponding relation of the Chirp pulse is as follows: (0,T) fra )→(f 1 ,f l(1) )，(T fra ,T)→(f h(1) ,f 2 ) (ii) a This means that the narrowband interference signal band is removed, and narrowband interference suppression is realized.
Preferably, after step 3), in order to further enable the pulse to pass through the sideband of the narrowband interference signal at the maximum instantaneous frequency to achieve more effective interference suppression, the instantaneous frequency of the nonlinear Chirp pulse may be modified by using Sqrt operation as follows:
and (3) integrating the instantaneous frequency to obtain a time domain expression of the nonlinear Sqrt Chirp pulse:
the advantages of the invention are as follows:
1. according to the invention, the UWB frequency band is divided at the transmitting end to obtain L different sub-frequency bands, and high-speed and multi-rate transmission can be realized according to the matching of a narrow-band interference signal in each sub-frequency band and the arrangement of a corresponding Chirp pulse.
2. The invention designs and adopts nonlinear Sqrt Chirp pulse in the sub-frequency band of the narrow-band interference signal, which can pass the frequency band of the narrow-band interference at the maximum instantaneous frequency, more effectively inhibit the influence of the narrow-band interference and simultaneously realize the inhibition of multiple narrow-band interference.
3. The invention carries out spread spectrum modulation on each sub-band Chirp pulse based on the good correlation characteristic of the orthogonal complementary code, can eliminate multiple access interference among users, interference among sub-bands and multipath interference, realizes simultaneous suppression and elimination of various interferences, and effectively improves the anti-interference capability and communication performance of the system.
Drawings
Fig. 1 is a schematic diagram of an ultra-wideband system in accordance with the present invention, wherein: 1. a transmitting node group; 2. a wireless multi-path channel; 3. a destination terminal;
fig. 2 is a flow chart of the interference suppression method of the present invention: wherein A-J are each a step;
FIG. 3 shows a Chirp sub-pulse w corresponding to each sub-band in step C of the interference suppression method of the present invention i (t) a block diagram of the construction flow, wherein (1) to (3) are the respective steps thereof.
The specific implementation mode is as follows:
the present invention is further described below by reference to the following drawings and examples, but is not limited thereto.
As shown in fig. 1-3.
Examples 1,
A interference suppression method of a multiband orthogonal complementary code ultra-wideband system based on nonlinear Sqrt Chirp pulses is disclosed, wherein the ultra-wideband system comprises a group of transmitting nodes and a single target terminal 3, wherein the group of transmitting nodes 1 comprises a plurality of transmitting nodes, each transmitting node corresponds to a user, the transmitting nodes and the target terminal are both provided with a single antenna, and the transmitting nodes send multi-user signals to the target terminal through a wireless multi-path channel 2; the signal received by the target terminal is from a useful signal sent by a transmitting node group, other UWB user signals, and multiple narrow-band interference signals, sub-band interference signals, multi-path signals and Gaussian white noise signals existing in a channel environment, and the interference suppression method specifically comprises the following steps:
A. the UWB communication system is ready to begin operation;
B. the UWB communication system obtains the frequency band (f) of multiple narrow-band interference signals in the communication environment by using the spectrum sensing technology l(j) , f h(j) ) And corresponding center frequency f (j) ，j∈(1,2,…,N)，f l(j) And f h(j) Respectively the lower limit frequency and the upper limit frequency of the jth narrow-band interference signal, wherein N is the number of narrow-band interference signals in the communication environment;
C. dividing the bandwidth of the available frequency band of the UWB communication system into L sub-bands according to the frequency band position of the narrow-band interference signal, allocating an OCC code to each sub-band, and matching and setting a corresponding Chirp pulse w for each sub-band i (t), i ∈ (1, 2, \8230;, L), and L>N；
D. Let UWB communication system have K users in total, { C 1 ,C 2 ,…,C K Is an orthogonal complementary sequence set, the OCC of the kth user isM is the number of element codes of OCC of the kth user, and each element code C m k Containing N c Spreading each sub-band by using OCC codes;
E. according to the number of the sub-frequency bands, data bits are transmitted in groups of L bits, converted into L branches in a serial-parallel mode and transmitted in parallel on the corresponding L sub-frequency bands; each branch circuit is subjected to OCC (optical code carrier) spread spectrum and then multiplied by Chirp pulses determining respective frequency bands, and each Chirp pulse modulated by a spread spectrum code is characterized byWhereinThe nth data bit sent for the kth user,is the jth chip of the ith element code of the user k; let 1 st user be the desired user, and the time delay between the last arrival path of the 2 nd to k th users and the first arrival path of the 1 st user be τ = η T c + ζ of whichZeta-distribution over [0, T ] c ]，T c Is the duration of each chip, and the duration of each element code is T p ＝(N c +η+1)T c ；
F. The method comprises the steps that an information source sends data bits, the data bits are represented through Chirp pulses modulated by OCC spread spectrum, the data bits are transmitted through L parallel branches, then all sending signals are superposed together and transmitted into a multi-path channel through an antenna, and except for multi-path fading, other user UWB signals and additive white Gaussian noise in a narrow-band system and a UWB communication system which coexist with a UWB system generate interference on UWB signals of an expected user and commonly appear in a receiving signal;
G. at a receiving end, a Rake receiver is adopted to process a received signal r (t) in each sub-frequency band, the Rake receiver comprises F correlators, and the correlators integrate the product of the received signal r (t) and a template signal m (t);
H. within the l sub-band, the received signal r (t) is correlated with a corresponding template signal m (t), the output decision variable of which is Z l ，Z l ＝S U +S I +S M +S P +S F +S n In which S is U As a useful signal component, S I As narrow-band interference components, S M For multiple access interference components, S P As a multipath interference component, S F For sub-band interference terms, S n Is an additive white gaussian noise term;
I. according to the steps, the output decision variable Z of the Rake receiver in the ith sub-band of the user k is obtained kl And judging by adopting a maximum likelihood criterion to obtain an average error probability expression of the UWB communication system, wherein the average error probability expression is as follows:
whereinF is the number of fingers of the Rake receiver, the number of correlators is the same as the number of fingers of the Rake receiver, w f Weighting factor, P (Z), for the f-th correlator kl < 0| '1') refers to the probability that a transmission symbol is 1 and is misjudged to be 0, P (Z) kl > 0| '0') refers to the probability that a transmission symbol is 0 and is misjudged to be 1;
J. when the transmission of the data bit is completed, the communication is ended.
Examples 2,
The method for suppressing interference of the multiband orthogonal complementary code ultra-wideband system based on the nonlinear Sqrt Chirp pulse in embodiment 1, wherein a corresponding Chirp pulse w is set in each sub-band in the step C in a matching manner i The method (t) is specifically as follows:
1) Detecting a narrow-band interference band by using a spectrum sensing technique, providing a narrow-band interference signal, and determining the UWB band (f) l ,f h ) Divided into three sections, i.e. (f) l ,f 1 )、(f 1 ,f 2 ) And (f) 2 ,f h )，f l And f h Respectively the lower limit frequency and the upper limit frequency of the UWB band, each sub-band bandwidth is more than 500MHZ, and a narrow-band interference signal is arranged in the 2 nd sub-band (f) 1 ,f 2 ) Internal;
2) In the ith (i =1, 3) sub-band without narrow-band interference signal, a linear Chirp pulse w with the waveform center at t =0 is adopted i (t)＝p(t)cos[2π(f 0 +iB i )t+πμt 2 ]P (t) is the envelope of each subband and when | t>, T/2 p (T) =0, T is signal period, mu is sweep rate, B i Is the bandwidth of the ith sub-band;
3) In a sub-band (f) where a narrow-band interference signal is present 1 ,f 2 ) In the method, a nonlinear Chirp pulse for effectively inhibiting narrow-band interference is designed: in the sub-frequency band, according to the time-frequency mapping relation of Chirp pulse, obtaining the lower limit frequency f of the narrow-band interference signal l(1) Corresponding to the time point T fra ＝T(f l(1) -f 1 )/B’，B’＝(f 2 -f 1 )-(f h(1) -f l(1) ) For the corrected frequency bandwidth, the time-frequency corresponding relation of the Chirp pulse is as follows: (0,T) fra )→(f 1 ,f l(1) )，(T fra ,T)→(f h(1) ,f 2 ) (ii) a This means that the narrowband interference signal band is removed, and narrowband interference suppression is realized.
Examples 3,
The method for suppressing interference of the multiband orthogonal complementary code ultra wideband system based on the nonlinear Sqrt Chirp pulse in embodiment 2 is different from the method in that after the step 3), in order to further enable the pulse to pass through the narrowband interference signal sideband at the maximum instantaneous frequency to achieve more effective interference suppression, the instantaneous frequency of the nonlinear Chirp pulse can be corrected by adopting Sqrt operation to:
and (3) integrating the instantaneous frequency to obtain a time domain expression of the nonlinear Sqrt Chirp pulse:
Claims (2)
1. a multi-band orthogonal complementary code ultra-wideband system interference suppression method based on nonlinear Sqrt Chirp pulses is characterized by comprising the following steps:
A. the UWB communication system is ready to begin operation;
B. the UWB communication system obtains frequency bands (f) where multiple narrow-band interference signals are located in the communication environment l(j) ,f h(j) ) And corresponding center frequency f (j) ，j∈(1,2,…,N)，f l(j) And f h(j) Lower limit of jth narrow-band interference signal respectivelyFrequency and upper limit frequency, N is the number of narrow-band interference signals in the communication environment;
C. the bandwidth of an available frequency band of the UWB communication system is divided into L sub-bands according to the frequency band position of the narrow-band interference signal, each sub-band is allocated with an OCC code, and each sub-band is matched and provided with a corresponding Chirp pulse w i (t), i ∈ (1, 2, \8230;, L), and L>N；
D. Let UWB communication system have K users altogether, { C 1 ,C 2 ,…,C K Is an orthogonal complementary sequence set, the OCC of the kth user isM is the number of element codes of OCC of the kth user, and each element codeContaining N c Spreading each sub-band by using OCC codes;
E. according to the number of the sub-frequency bands, data bits are transmitted in groups of L bits, converted into L branches in a serial-parallel mode and transmitted in parallel on the corresponding L sub-frequency bands; OCC (orthogonal code division multiplexing) is carried out on each branch, and then each branch is multiplied by a Chirp pulse determining respective frequency band, and the Chirp pulse modulated by each bit through a spreading code is characterized by beingWhereinThe nth data bit sent for the kth user,is the jth code chip of the ith element code of the user k; let 1 st user be the desired user, and the time delay between the last arrival path of 2 nd to kth users and the first arrival path of 1 st user be τ = η T c + ζ of whichZeta is uniformly distributed over 0, T c ]，T c Is the duration of each chip, and the duration of each element code is T p ＝(N c +η+1)T c ；
F. The method comprises the steps that an information source sends data bits, the data bits are represented through Chirp pulses modulated by OCC spread spectrum, the data bits are transmitted through L parallel branches, then all sending signals are superposed together and transmitted into a multi-path channel through an antenna, and except for multi-path fading, other user UWB signals and additive white Gaussian noise in a narrow-band system and a UWB communication system which coexist with a UWB system generate interference on UWB signals of an expected user and commonly appear in a receiving signal;
G. at a receiving end, processing a received signal r (t) in each sub-frequency band by adopting a Rake receiver, wherein the Rake receiver comprises F correlators, and the correlators integrate the product of the received signal r (t) and a template signal m (t);
H. in the first sub-band, the received signal r (t) is correlated with the corresponding template signal m (t), and the output decision variable is Z l ，Z l ＝S U +S I +S M +S P +S F +S n In which S is U Is a useful signal component, S I As narrow-band interference components, S M For multiple access interference components, S P As a multipath interference component, S F For the sub-band interference term, S n Is an additive white gaussian noise term;
I. according to the steps, the output decision variable Z of the Rake receiver in the ith sub-band of the user k is obtained kl And judging by adopting a maximum likelihood criterion to obtain an average error probability expression of the UWB communication system, wherein the average error probability expression is as follows:
whereinF is Rake receptionThe number of branches of the machine, the number of correlators of which is the same as the number of branches of the Rake receiver, w f As a weighting factor for the f-th correlator, P (Z) kl < 0| '1') refers to the probability that a transmitted symbol is 1 and is misjudged to be 0, P (Z) kl > 0| '0') refers to the probability that a transmission symbol is 0 and is misjudged as 1;
J. when the data bit is sent, the communication is finished;
and C, setting a corresponding Chirp pulse w for each sub-band in the step C in a matching manner i The method (t) is specifically as follows:
1) Detecting a narrow-band interference band, providing a narrow-band interference signal, in which case the UWB band (f) is detected l ,f h ) Divided into three sections, i.e. (f) l ,f 1 )、(f 1 ,f 2 ) And (f) 2 ,f h )，f l And f h Respectively the lower limit frequency and the upper limit frequency of the UWB band, each sub-band bandwidth is more than 500MHZ, and a narrow-band interference signal is arranged in the 2 nd sub-band (f) 1 ,f 2 ) Internal;
2) In the ith (i =1, 3) sub-band without narrow-band interference signal, a linear Chirp pulse w with the waveform center at t =0 is adopted i (t)＝p(t)cos[2π(f 0 +iB i )t+πμt 2 ]P (t) is the envelope of each sub-band and when | t & gtis not charging&T/2, p (T) =0, T is signal period, mu is sweep frequency rate, B i Is the bandwidth of the ith sub-band;
3) In a sub-band (f) where a narrow-band interfering signal is present 1 ,f 2 ) In the method, a nonlinear Chirp pulse for effectively inhibiting narrow-band interference is designed: in the sub-frequency band, the lower limit frequency f of the narrow-band interference signal is obtained according to the time-frequency mapping relation of Chirp pulse l(1) Corresponding time point is T fra ＝T(f l(1) -f 1 )/B’，B’＝(f 2 -f 1 )-(f h(1) -f l(1) ) For the corrected frequency bandwidth, the time-frequency corresponding relation of the Chirp pulse is as follows: (0,T) fra )→(f 1 ,f l(1) )，(T fra ,T)→(f h(1) ,f 2 ) (ii) a And 3) removing the narrow-band interference signal frequency band to realize narrow-band interference suppression.
2. The interference suppression method for the multiband orthogonal complementary code ultra-wideband system based on the nonlinear Sqrt Chirp pulse as claimed in claim 1, wherein after the step 3), the instantaneous frequency of the nonlinear Chirp pulse is corrected by using Sqrt operation as follows:
and integrating the instantaneous frequency to obtain a time domain expression of the nonlinear Sqrt Chirp pulse:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980793.2A CN105553511B (en) | 2015-12-23 | 2015-12-23 | A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510980793.2A CN105553511B (en) | 2015-12-23 | 2015-12-23 | A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105553511A CN105553511A (en) | 2016-05-04 |
| CN105553511B true CN105553511B (en) | 2018-02-23 |
Family
ID=55832471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510980793.2A Active CN105553511B (en) | 2015-12-23 | 2015-12-23 | A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105553511B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017220828A1 (en) | 2017-11-22 | 2019-05-23 | Robert Bosch Gmbh | Method and system for suppressing an interference signal in the detection of a chirp signal |
| CN108495260B (en) * | 2018-03-29 | 2020-12-29 | 上海乖行通信息科技有限公司 | Wireless communication method based on UWB ranging and wireless communication equipment thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312375A (en) * | 2013-05-17 | 2013-09-18 | 山东大学 | OCC (orthogonal complementary code) UWB (ultra wide band) system interference suppression method based on Chirp pulse |
-
2015
- 2015-12-23 CN CN201510980793.2A patent/CN105553511B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312375A (en) * | 2013-05-17 | 2013-09-18 | 山东大学 | OCC (orthogonal complementary code) UWB (ultra wide band) system interference suppression method based on Chirp pulse |
Non-Patent Citations (2)
| Title |
|---|
| 《Adaptive Non-linear Chirp UWB Waveform Design for Multiple Narrowband Interferences Suppression》;高深等;《IEEE》;20141231;第508页-第512页 * |
| 《Modified Nonlinear SQRT Chirp Waveform Based OS-OCC UWB System》;孔凡堂等;《IEEE》;20151016;第364页-第369页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105553511A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100906383B1 (en) | Narrow-band interference suppression method in uwb ranging systems | |
| KR100730444B1 (en) | Pulse waveform producing method | |
| US8406278B2 (en) | Narrowband interference rejection for ultra-wideband systems | |
| Cardinali et al. | UWB ranging accuracy in high-and low-data-rate applications | |
| Xu et al. | Ultra-wideband technology: Yesterday, today, and tomorrow | |
| US20070237065A1 (en) | M-ARY Orthogonal Coded/Balanced UWB Transmitted Reference Systems | |
| CN103312375B (en) | OCC (orthogonal complementary code) UWB (ultra wide band) system interference suppression method based on Chirp pulse | |
| CN105553511B (en) | A kind of multiband ultra-wideband system disturbance restraining method based on Sqrt Chirp pulses | |
| US7729407B2 (en) | Single-pulse and multi-pulse transmitted reference impulse radio systems with energy detecting receivers | |
| Hossain et al. | Performance analysis of barker code based on their correlation property in multiuser environment | |
| Yang et al. | Wireless Localization Using Ultra‐Wideband Signals | |
| US7539267B2 (en) | Impulse radio systems with multiple pulse types | |
| KR20080110790A (en) | Non-data-aided channel estimators for multipath and multiple antenna wireless systems | |
| CN108900211A (en) | A method of ultra-wideband impulse radio interference is inhibited using correlation receiver stencil design | |
| Sipal et al. | Multi-tone frequency shift keying for ultrawideband wireless communications | |
| Aranda et al. | RAKE receiver finger assignment for ultra-wideband radio | |
| Striano et al. | Fractional fourier transform based joint radar communication system for multi-user automotive applications | |
| Zhang | 8.2 uwb basics,” | |
| Sharp et al. | Signaling techniques | |
| CN105610466B (en) | The anti-interference high speed transmission method of radio ultra wide band system based on code selection technique | |
| Bai et al. | MAI and MI performance of the orthogonal complementary code based DS-BPAM UWB system | |
| Farhang-Boroujeny et al. | Filter Bank UWB Communications | |
| Orlić et al. | Choice of suitable monocycle shape for ultra wideband systems | |
| Naanaa et al. | Average collision number criterion for TH-UWB code selection | |
| Liu | Multi-code ultra-wideband signaling using chirp waveforms |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |