CN105490762B - Improve the signal processing method of non-coherent ultra-broad band receiver energy capture efficiency - Google Patents
Improve the signal processing method of non-coherent ultra-broad band receiver energy capture efficiency Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
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Abstract
The invention discloses a kind of signal processing methods for improving non-coherent ultra-broad band receiver energy capture efficiency, the following steps are included: 1) establish reference pulse cluster RPCS and data pulse cluster DPCS according to raw data symbols, again to adding zero pulse after each data pulse DPC in each reference pulse RPC in reference pulse cluster RPCS and data pulse cluster DPCS, wherein, reference pulse RPC and data pulse DPC is in a symbol period TsIt is inside alternately repeated transmission, obtains the I-TRPC signal s (t) of transmitting terminal sending；2) transmitting terminal sends the I-TRPC signal s (t) after UWB channel and low-pass filter；3) receiving end carries out auto-correlation reception, obtains judgment variables D (i)；4) it is made decisions according to the judgment variable D (i) using self-adaptive decision threshold, recovers raw data symbols.The present invention can effectively improve the energy capture efficiency of ultra-wideband communication system and improve the error performance of ultra-wideband communication system.
Description
Technical field
The invention belongs to technical field of ultra-wideband radio communication, it is related to a kind of raising non-coherent ultra-broad band receiver energy and catches
Obtain the signal processing method of efficiency.
Background technique
With wireless communication with the development of network technology, merge, ultra wide band (Ultra-wideband, UWB) technology is with low
The features such as cost, low-power consumption and good time domain resolution capability, becomes a kind of short-distance wireless communication solution.IEEE
802.15.4a standard uses the UWB scheme based on impulse radio (Impulse radio, IR) standard.IR-UWB system has
Accurate positioning performance, however its huge challenge for still suffering from the actual requirements such as low cost, low-power consumption.Therefore, in low bit- rate
Occasion is more lower, noncoherent receiver of less demanding to sampling rate and not needing channel estimation using complexity.
Popular detection technique currently used for non-coherent ultra-broad band system is energy detector (Energy detector, ED) and from phase
It closes receiver (Autocorrelation receiver, AcR).Both have that structure is simple, is not necessarily to precise synchronization and channel
The characteristics of estimation, Robust Performance.
Wherein, energy measuring usually combines with pulse position modulation (Pulse Positon Modulation, PPM) and makes
With to become a kind of classical, practical non-coherent ultra-broad band receiver；Autocorrelation receiver is usually used in transmission reference
(Transmitter Reference, TR) radio ultra wide band system.In order to avoid interfering (Inter-pulse caused by multipath transmisstion
Interference, IPI), traditional TR-UWB system needs too long delay line to be isolated with reference to arteries and veins when auto-correlation receives
Punching and data pulse, are difficult to realize with current technological level.
Transmission reference pulse cluster (Transmitter Reference pulse cluster, TRPC) signal structure mentions
Efficiently solve the problems, such as that TR-UWB system delay line is too long out.TRPC signal has overall compact pulse arrangements structure,
The influence for compensating IPI with higher energy efficiency simultaneously, shortens dramatically delay line in this way.In recent years, TRPC-UWB system
System has become a kind of irrelevant radio ultra wide band system for having much potentiality.
In order to further increase system performance, it is thus proposed that a kind of improved TRPC signal structure (hereinafter referred to as I-
TRPC).But the system does not account for multipath channel delay when auto-correlation receives, therefore in Dense Multipath Channels, especially
Postpone that satisfied energy capture efficiency can not be obtained under biggish non line of sight multipath propagation environment, to cause system error code
The deterioration of energy.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of raising non-coherent ultra-broad band reception is provided
The signal processing method of function amount capture rate, this method can effectively improve the error performance of ultra-wideband communication system.
In order to achieve the above objectives, at the signal of the present invention for improving non-coherent ultra-broad band receiver energy capture efficiency
Reason method the following steps are included:
1) reference pulse cluster RPCS and data pulse cluster DPCS are established according to raw data symbols, then gives reference pulse cluster
Zero pulse is added after each data pulse DPC in each reference pulse RPC and data pulse cluster DPCS in RPCS, wherein reference pulse
RPC and data pulse DPC is in a symbol period TsIt is inside alternately repeated transmission, obtains the I-TRPC signal s of transmitting terminal sending
(t)；
2) the I-TRPC signal s (t), which is launched, reaches receiving end through UWB channel after end is sent and passes through low-pass filter
Carry out low-pass filtering；
3) receiving end carries out auto-correlation reception to the reception signal after low-pass filtering, obtains judgment variables D (i)；
4) it is made decisions according to the judgment variable D (i) using self-adaptive decision threshold, recovers raw data symbols.
Reference pulse RPC and data pulse DPC is T by least two continuous delaysdIdeal pulse composition.
The expression formula for the I-TRPC signal s (t) that the transmitting terminal issues are as follows:
Wherein, it is T that g (t), which is delay,rReference pulse and data pulse composite pulse cluster, p (t) be have delay TpJust
Normal pulse, the delay between each of reference pulse RPC and data pulse DPC normal burst is Td, each reference
The delay T of pulse RPC and data pulse DPCr=(Np+Nz)Td, NpAnd NzFor each reference pulse RPC or data pulse DPC
The number of the number of interior pulse and corresponding zero pulse, EbFor the average energy of each symbol, dmFor m transmitting symbol,
In, dm∈ { -1,1 }, NfFor reference pulse RPC in each symbol and the duplicate number of data pulse DPC, TsProlong for each symbol
The slow time.
The signal that the receiving end receives is r (t), wherein
R (t)=s (t) * h (t)+n (t) (5)
Wherein, * represents linear convolution, and n (t) represents additive white Gaussian noise, and h (t) is multipath channel impulse response,K is identifiable number of path, akAnd τkThe respectively multiple fading coefficients of the road K multipath component
It is delayed with reaching, Ts≥2NfTr+τmax, τmaxIt is delayed for the maximum multipath of channel.
The expression formula of judgment variables D (i) are as follows:
Wherein, T1=Td+Tl, T2=(2Nf-1)Td+Th+Tp, TlAnd ThThe starting of respectively improved autocorrelation integral
Point and end point, TrThe time postponed for each reference pulse RPC or data pulse DPC.
The invention has the following advantages:
The signal processing method of the present invention for improving non-coherent ultra-broad band receiver energy capture efficiency is processed
Cheng Zhong considers that channel latency improves integrating range and obtains judgment variables D (i) when receiving end carries out auto-correlation reception, and by certainly
It adapts to decision threshold to make decisions, so as to improve the error performance of non-coherent ultra-broad band communication system.Compared to existing TRPC system
System with I-TRPC system, the F-iTRPC system that the present invention obtains in terms of error performance can be improved significantly.In addition, this
Invention can be generalized to PPM-UWB system, and NC-PPM system does not need threshold value judgement, only carries out the optimization in energy integral section,
Also similar effect can be obtained.
Detailed description of the invention
Fig. 1 is system model of the invention；
Fig. 2 is I-TRPC system and F-iTRPC system and original TRPC system in IEEE802.15.4a channel model
The error performance comparison diagram of zero threshold value judgement and self-adaptive decision is respectively adopted under 1 environment；
Fig. 3 is I-TRPC system and F-iTRPC system and original TRPC system in IEEE802.15.4a channel model
The error performance comparison diagram of zero threshold value judgement and self-adaptive decision is respectively adopted under 2 environment；
Fig. 4 is I-TRPC system and F-iTRPC system and original TRPC system in IEEE802.15.4a channel model
The error performance comparison diagram of zero threshold value judgement and self-adaptive decision is respectively adopted under 8 environment；
Fig. 5 is I-NCPPM system and F-iNCPPM system and original NC-PPM system in IEEE802.15.4a channel
Error performance comparison diagram under 1 environment of model；
Fig. 6 is I-NCPPM system and F-iNCPPM system and original NC-PPM system in IEEE802.15.4a channel
Error performance comparison diagram under 2 environment of model；
Fig. 7 is I-NCPPM system and F-iNCPPM system and original NC-PPM system in IEEE802.15.4a channel
Error performance comparison diagram under 8 environment of model；
Fig. 8 is flow diagram of the present invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 1 and Fig. 8, the signal processing of the present invention for improving non-coherent ultra-broad band receiver energy capture efficiency
Method the following steps are included:
1) reference pulse cluster RPCS and data pulse cluster DPCS are established according to raw data symbols, then gives reference pulse cluster
Zero pulse is added after each data pulse DPC in each reference pulse RPC and data pulse cluster DPCS in RPCS, wherein reference pulse
RPC and data pulse DPC is in a symbol period TsIt is inside alternately repeated transmission, obtains the I-TRPC signal s of transmitting terminal sending
(t)；
2) the I-TRPC signal s (t), which is launched, reaches receiving end through UWB channel after end is sent and passes through low-pass filter
Carry out low-pass filtering；
3) receiving end carries out auto-correlation reception to the reception signal after low-pass filtering, obtains judgment variables D (i)；
4) it is made decisions according to the judgment variable D (i) using self-adaptive decision threshold, recovers raw data symbols.
Reference pulse RPC and data pulse DPC is T by least two continuous delaysdIdeal pulse composition.
The expression formula for the I-TRPC signal s (t) that the transmitting terminal issues are as follows:
Wherein, it is T that g (t), which is delay,rReference pulse and data pulse composite pulse cluster, p (t) be have delay TpJust
Normal pulse, the delay between each of reference pulse RPC and data pulse DPC normal burst is Td, each reference
The delay T of pulse RPC and data pulse DPCr=(Np+Nz)Td, NpAnd NzFor each reference pulse RPC or data pulse DPC
The number of the number of interior pulse and corresponding zero pulse, EbFor the average energy of each symbol, dmFor m transmitting symbol,
In, dm∈ { -1,1 }, NfFor reference pulse RPC in each symbol and the duplicate number of data pulse DPC, TsProlong for each symbol
The slow time.
The signal that the receiving end receives is r (t), wherein
R (t)=s (t) * h (t)+n (t) (5)
Wherein, * represents linear convolution, and n (t) represents additive white Gaussian noise, and h (t) is multipath channel impulse response, and K is
Identifiable number of path, akAnd τkThe respectively multiple fading coefficients of the road K multipath component and arrival delay, Ts≥2NfTr+τmax,
τmaxIt is delayed for the maximum multipath of channel, wherein
The expression formula of judgment variables D (i) are as follows:
It is obtained by formula (6)
Wherein, T1=Td+Tl, T2=(2Nf-1)Td+Th+Tp, TlAnd ThThe starting of respectively improved autocorrelation integral
Point and end point, TrThe time postponed for each reference pulse RPC or data pulse DPC.
As shown in Figure 4, when channel latency is serious, I-TRPC can not be such that error performance is improved, and the present invention can
So that system error performance is significantly improved.
For NC-PPM, obtained judgment variables are as follows:
As shown in Figure 7, when channel latency is serious, I-NCPPM system can not be such that error performance is improved, the present invention
System error performance can be made to be significantly improved.
It should be noted that the system that TRPC system structure obtains after the present invention improves is denoted as F-iTRPC；Further
I-TRPC and F-iTRPC structure is generalized to NC-PPM system, respectively obtains I-NCPPM and F-iNCPPM.
TRPC described above and NC-PPM system are merely a preferred embodiment of the present invention, and are not limited to this hair
Bright, for those skilled in the art, the invention may be variously modified and varied, and this method can be used for other based on energy
In the incoherent UWB communication system for measuring detection.All within the spirits and principles of the present invention, it is made it is any modification, equally replace
It changes, improve, should all be included in the protection scope of the present invention.
Claims (1)
1. it is a kind of improve non-coherent ultra-broad band receiver energy capture efficiency signal processing method, which is characterized in that including with
Lower step:
1) reference pulse cluster RPCS and data pulse cluster DPCS are established according to raw data symbols, then in reference pulse cluster RPCS
Zero pulse is added after each data pulse DPC in each reference pulse RPC and data pulse cluster DPCS, wherein reference pulse RPC sum number
According to pulse DPC in a symbol period TsIt is inside alternately repeated transmission, obtains the I-TRPC signal s (t) of transmitting terminal sending；
2) the I-TRPC signal s (t) be launched end send after through UWB channel reach receiving end, and by low-pass filter into
Row low-pass filtering；
3) receiving end carries out auto-correlation reception to the reception signal after low-pass filtering, obtains judgment variables D (i)；
4) it is made decisions according to the judgment variables D (i) using self-adaptive decision threshold, recovers raw data symbols；
Reference pulse RPC and data pulse DPC is T by least two continuous delaysdIdeal pulse composition；
The expression formula for the I-TRPC signal s (t) that the transmitting terminal issues are as follows:
Wherein, it is T that g (t), which is delay,rReference pulse and data pulse composite pulse cluster, p (t) be have delay TpNormal arteries and veins
It rushes, the delay between each of reference pulse RPC and data pulse DPC normal burst is Td, each reference pulse
The delay T of RPC and data pulse DPCr=(Np+Nz)Td, NpAnd NzFor arteries and veins in each reference pulse RPC or data pulse DPC
The number of the number of punching and corresponding zero pulse, EbFor the average energy of each symbol, dmFor m transmitting symbol, wherein dm
∈ { -1,1 }, NfFor reference pulse RPC in each symbol and the duplicate number of data pulse DPC, TsFor each symbol delay when
Between；
The signal that the receiving end receives is r (t), wherein
R (t)=s (t) * h (t)+n (t) (5)
Wherein, * represents linear convolution, and n (t) represents additive white Gaussian noise, and h (t) is multipath channel impulse response,K is identifiable number of path, akAnd τkThe respectively multiple fading coefficients of the road K multipath component
It is delayed with reaching, Ts≥2NfTr+τmax, τmaxIt is delayed for the maximum multipath of channel；
The expression formula of judgment variables D (i) are as follows:
Wherein, T1=Td+Tl, T2=(2Nf-1)Td+Th+Tp, TlAnd ThThe starting point and knot of respectively improved autocorrelation integral
Beam spot, TrFor the time that each reference pulse RPC or data pulse DPC postpones, TpFor normal burst p (t) in I-TRPC signal
Duration.
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| CN101001087A (en) * | 2006-01-09 | 2007-07-18 | 罗仁泽 | Quasi-barker construction method with zero correlation band |
| CN101383629A (en) * | 2008-07-23 | 2009-03-11 | 哈尔滨工业大学深圳研究生院 | UWB receiver error rate performance optimizing method by noncoherent energy detection |
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| CN101001087A (en) * | 2006-01-09 | 2007-07-18 | 罗仁泽 | Quasi-barker construction method with zero correlation band |
| CN101383629A (en) * | 2008-07-23 | 2009-03-11 | 哈尔滨工业大学深圳研究生院 | UWB receiver error rate performance optimizing method by noncoherent energy detection |
| CN104734814A (en) * | 2015-03-30 | 2015-06-24 | 长安大学 | LDPC coding and decoding method applied in incoherent ultra-wideband communication system |
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| Improved Transmitted Reference Pulse Cluster Scheme for Ultra Wideband Communication Systems;Jin Y., Shen B., Kwak K. S.;《IET communications》;20121016;第6卷(第15期);期刊第2267-2273页，摘要，第2部分信号与系统模型，图1-3 |
| Integration Interval Determination Algorithms for BER Minimization in UWB Transmitted Reference Pulse Cluster Systems;Jin L., Dong X. D., Liang Zhonghua;《IEEE Transactions on Wireless Communication》;20100628;第9卷(第8期);期刊第2408-2414页，摘要，第II部分TRPC系统模型，第III部分TRPC系统积分区间的确定 |
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