CN101686217A - Method and device for detecting ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system - Google Patents
Method and device for detecting ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting a ranging code of an uplink channel of an orthogonal frequency division multiple access (OFDMA) system. The method comprises the following steps: after converting the received ranging signal, acquiring an energy value of each time delay tap; judging whether the maximum peak value and the second maximum peak value of the energy of each time delay tap are adjacent or not, if the maximum peak value and the second maximum peak value are adjacent, determining a decision value of the energy of each time delay tap according to the maximum peak value and the second maximum peak value, and if the maximum peak value and the second maximum peak value are not adjacent, setting the decision value of the energy of each time delay tap as a maximum peak value of the energy of each time delay tap; and according to the decision value and the threshold value of the energy of each time delay tap, determining whether a user is detected on the ranging code or not. The method for detecting the ranging code of the uplink channel of the OFDMA system greatly reduces the undetected probability of the ranging code detection by judging whether the maximum peak value and the second maximum peak value of the energy of each time delay tap are adjacent or not.
Description
Technical field
The present invention relates to the up channel ranging technology, relate in particular to a kind of OFDM (Orthogonal Frequency Division Multiple Access, OFDMA) detection method of up channel ranging code and device in the system.
Background technology
At present, wireless communication system is widely used in providing wireless applications such as voice, internet access, web page browsing, paging, short message, user profile service, file transfer, video conference, amusement, sensing and distributed control.Typical wireless communication system comprises cellular system, WLAN (wireless local area network), wireless wide area network, satellite system, mobile Ad hoc network.The service range of wireless communication system can be indoor, city, area, whole world etc.
In order to carry out interoperability each other, standardization body is with wireless communication system standardsization.3GPP formulates second generation cellular standards GSM, third generation cellular standards WCDMA and evolution version LTE thereof.3GPP2 formulates second generation cellular standards IS-95, third generation cellular standards CDMA 2000 and evolution version UMB thereof.IEEE formulates WLAN standard IEEE 802.11 (Wi-Fi) and wireless metropolitan area network standard IEEE802.16 (WiMAX).ARIB formulates personal portable telephone system PHS and wireless broadband system XG-PHS.
Fig. 1 a has represented a wireless communication system.This wireless communication system is made up of a plurality of base stations and a plurality of terminal.The base station is the access that terminal is provided to key wired network.Terminal is by down link and up link and base station communication.Down link is meant the communication link from the base station to the terminal, and up link is meant the communication link from terminal to base station.
Fig. 1 b represents that base station and terminal transmit and receive the block diagram of data.Terminal has been installed M root antenna, and N root antenna has been installed in the base station.For down link, the baseband transmission processing module of base station side is carried out Base-Band Processing to the data of input.Operations such as Base-Band Processing comprises chnnel coding, interweaves, planisphere mapping, Space Time Coding.Signal one total N through Base-Band Processing
DlN is delivered on the road of (＜=N) respectively
DlOn the individual radio-frequency module, N
DlAfter individual radio-frequency module is finished processing such as up-conversion, band limit filtering and power amplification, with N
DlThe road radiofrequency signal is passed through N respectively
DlThe root antenna is launched.Radiofrequency signal is through behind the wireless channel, by the M of terminal
DlThe root of (＜=M) antenna receives.The M of terminal
DlIndividual radio-frequency module is with the M that receives
DlProcessing such as the road radiofrequency signal is amplified, filtering and down-conversion offer the base band receiving processing module, and the base band receiving processing module is to M
DlAfter the operations such as decoding when the road signal carries out constellation diagram mapping, sky, deinterleaving, channel-decoding, dateout.For up link, the baseband transmission processing module of end side is carried out Base-Band Processing to the data of input.Operations such as Base-Band Processing comprises chnnel coding, interweaves, planisphere mapping, Space Time Coding.Signal one total M through Base-Band Processing
UlM is delivered on the road of (＜=M) respectively
UlOn the individual radio-frequency module, M
UlAfter individual radio-frequency module is finished processing such as up-conversion, band limit filtering and power amplification, with M
UlThe road radiofrequency signal is passed through M respectively
UlThe root antenna is launched.Radiofrequency signal is through behind the wireless channel, by the N of base station
UlThe root of (＜=N) antenna receives.The N of base station
UlIndividual radio-frequency module is with the N that receives
UlProcessing such as the road radiofrequency signal is amplified, filtering and down-conversion offer the base band receiving processing module, and the base band receiving processing module is to N
UlAfter the operations such as decoding when the road signal carries out constellation diagram mapping, sky, deinterleaving, channel-decoding, dateout.
Wireless communication system can realize that radio spectrum resources is shared by multiple access technique.Multiple access technique is finished by dimensions such as time, frequency, sign indicating number, space are divided.Typical multiple access technique comprises being used in combination of frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), space division multiple access (SDMA) and they.OFDMA is a multi-access mode of using FDMA in ofdm system, and single carrier-frequency division multiple access (SC-FDMA) is a kind of improved form of OFDMA.
Time synchronized is one of factor that influences the OFDMA systematic function.If the signal of user terminal emission is through behind the wireless channel, arriving the base station surpasses Cyclic Prefix with respect to the delay of time reference (orthogonality between the subcarrier will be destroyed for Cyclic Prefix, length CP), cause intersymbol interference, cause decreased performance.Therefore, desired user arrives signal of base station can be synchronous with time reference, guarantees that at least time delay does not surpass the length of Cyclic Prefix.
In the OFDMA of for example 802.16 standard codes system, the process of adjusting user terminal launch time realizes by range finding (Ranging).802.16 be the broadband wireless access standard that IEEE (Institute ofElectrical and Electronics Engineers) works out, more detailed information can be with reference to " IEEE Std 802.16e-2005 ".Range finding not only can be adjusted the time migration of user terminal, can also adjust the transmitting power of user terminal.Range finding comprises initial ranging and cycle range finding.Initial ranging allows user terminal to add network and obtains correct transmission parameter, for example time migration and transmitting power, guarantee user terminal can and base station communication.Perodic ranging afterwards allows user terminal to adjust transmission parameter and makes that user terminal can keep communicating by letter with the up channel of base station.
The OFDMA physical layer has been specified a range channel and the set of some special binary system pseudorandom ranging codes (ranging code).For the emission of finding range effectively, each user at random concentrate to select a ranging code from ranging code.Then ranging code is passed through the BPSK modulation system, be modulated on the subcarrier of range channel bit of each subcarrier.The length of each ranging code is 144 bits, is modulated to respectively on 144 subcarriers.These 144 subcarriers further are divided into 36 groups, and every group comprises 4 continuous sub-carriers.
The base station extracts this ranging code that has competitive relation, obtains temporal information and power.In detecting the process of user code, the base station obtains the channel impulse response of sign indicating number, and (Channel ImpulseResponse CIR), thereby obtains user's channel and state information.Timing and the power measurement system that makes can compensate user's near-far problem and because the propagation delay that radius of society causes too greatly.
Because having one or more than one user terminals is chosen on the identical ranging slot and sends distance measuring signal, the base station is after detecting ranging code and extract timing and power information from the distance measuring signal that receives, the broadcasting ranging response message is notified detected ranging code and corresponding ranging slot.Ranging response message also comprises the adjustment information (time and power adjustment) and the state indication (success or re-transmission) of the ranging code that each is detected.If user terminal is received successfully indication, the processing of then finding range finishes; Otherwise user terminal is adjusted transmitting power and timing according to the adjustment information of its ranging code that passes, and repeats ranging process, up to success.Based on above process, the main task that range finding is handled is that the detection of multi-user's ranging code, timing estimation and power are estimated.
A kind of detection mode of ranging code is the base station with the signal that receives with to make time domain with reference to ranging code relevant, finishes ranging code by correlation peak and detects.As, be described in list of references " Initialuplink synchronization and power control (ranging process) for OFDMAsystems ", Xiaoyu Fu; Hlaing Minn; Global TelecommunicationsConference, 2004.GLOBECOM ' 04.IEEE Volume 6,29Nov.-3Dec.2004 Page (s): 3999-4003Vol.6.The time domain correlation method need be handled all possible time delay hypothesis, and amount of calculation is bigger.
The detection of ranging code also can be finished by the frequency domain correlation method.The frequency domain correlation method be meant the base station with the signal that receives by fast fourier transform (Fast Fourier Transform, FFT) transform to frequency domain, frequency-region signal with relevant through the reference ranging code after the linear phase compensation that is directly proportional with time delay, finished ranging code by correlation peak and detected.As, be described in list of references " Comments on OFDMA ranging scheme described in IEEE 802.16 ab-01/01r1 ", J Krinock, M Singh, M Paff-IEEE 802.16Broadband WirelessAccess Working Group, 2001.The frequency domain correlation method need be handled all possible time delay hypothesis equally, and amount of calculation is still bigger.
The relevant method of a kind of ranging code alternative and process phase compensation is that the signal that receives transforms to the signal of frequency domain by FFT and multiplies each other with reference to ranging code, transforms to time domain by IFFT again, finishes ranging code by channel power distribution peak value and detects.For example, in 802.16 standards, because ranging code is 1 BPSK modulation through amplitude, therefore the signal of frequency domain is equivalent to frequency-region signal divided by the reference ranging code with multiplying each other with reference to ranging code, and its result is equivalent to the estimation of the sampled value of channel frequency domain impulse response on range channel of user on this ranging code.Frequency-region signal is with (Inverse Fast Fourier Transform, IFFT), what obtain is the channel time domain impulse response of user on this ranging code by inverse fourier transform again with reference to the product of ranging code.This method is relevant with respect to time domain to be reduced greatly with the amount of calculation frequency domain correlation method.The list of references that this method is described as, application number is 11/477,040 United States Patent (USP) " Apparatus and method fordetecting user in a communication ".
Fig. 2 illustrates the simplification schematic diagram that the channel ranging code detects.As shown in Figure 2, user terminal is selected a ranging code at random, is modulated on the ranging sub-carrier, passes through IFFT then, finishes the OFDM modulation.Ofdm signal is launched by antenna.The base station receives the distance measuring signal that passes through time delay by antenna, through FFT, time-domain signal is transformed to frequency-region signal, and the frequency-region signal on ranging sub-carrier multiplies each other with the reference ranging code respectively.Signal after multiplying each other is the estimation of the frequency domain channel impulse response of user on this ranging code.Frequency-region signal after multiplying each other transforms to time domain through IFFT, is the estimation of the time domain channel impulse response of user on this ranging code.Again the mould of the estimation of time domain channel impulse response is done square operation, obtain the channel delay distribute power of user on this ranging code.Then with the energy value that obtains according to big minispread, estimate whether there is the user on the last ranging code by judging module.
Fig. 3 illustrates the judgement flow process of the ranging code detection of prior art.As shown in Figure 3, the judging module of prior art compares (step 302) with energy peak-peak and certain threshold value earlier.If the energy peak-peak is greater than threshold value, then judgement detects the user and uses this ranging code (step 304); If the energy peak-peak is not more than threshold value, then judgement does not detect the user and uses this ranging code (step 306).
But the time delay of the distance measuring signal that common base station receives just is the integral multiple in sampling interval not necessarily, causes the false dismissal probability of ranging code higher.The false dismissal probability that how to reduce ranging code is a challenge, and corresponding solution also is not provided in the prior art.
Summary of the invention
The technical problem that the present invention will solve provides a kind of detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, can reduce the false dismissal probability that ranging code detects.
The detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system provided by the invention comprises: the energy value that the distance measuring signal that receives is carried out obtaining after the conversion each time delay tap; Whether peak-peak and the second largest peak value of judging the time delay tap energy be adjacent, if adjacent, then determines the decision content of time delay tap energy according to peak-peak and second largest peak value, otherwise the decision content of time delay tap energy is made as the peak-peak of time delay tap energy; Determine whether to detect the user according to the decision content of time delay tap energy and threshold value and use this ranging code.
An embodiment according to the detection method of ranging code of the present invention, above-mentioned decision content and threshold value according to the time delay tap energy determines whether to detect the user and use the step of this ranging code to comprise: whether the decision content of judging the time delay tap energy is greater than threshold value, if greater than, then judgement detects the user and uses this ranging code; Otherwise judgement does not detect the user and uses this ranging code.Wherein, this threshold value is the multiple of the third-largest peak value of time delay tap energy, perhaps the multiple of the average of all time delay tap energy.
According to an embodiment of the detection method of ranging code of the present invention, above-mentionedly determine that according to described peak-peak and described second largest peak value the step of the decision content of time delay tap energy comprises: the decision content of time delay tap energy is made as peak-peak and second largest peak value sum.
According to an embodiment of the detection method of ranging code of the present invention, above-mentionedly the distance measuring signal that receives is carried out the step that conversion obtains the energy value of each time delay comprise: the distance measuring signal that receives is transformed to frequency-region signal by FFT in the base station; With this frequency-region signal with multiply each other with reference to ranging code after, be transformed to time-domain signal by IFFT; The amplitude of this time-domain signal is carried out square, obtain the energy value on each time delay tap.
Another technical problem that the present invention will solve provides a kind of checkout gear of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, can reduce the false dismissal probability that ranging code detects.
The invention provides a kind of checkout gear of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, comprising: time delay tap energy acquisition module, be used for the distance measuring signal that receives is carried out conversion, obtain the energy value of time delay tap; Judge the energy value determination module, be used for judging whether this time delay tap energy peak-peak and second largest peak value be adjacent, if it is adjacent, then determine the decision content of time delay tap energy, otherwise the decision content of time delay tap energy is made as the peak-peak of described time delay tap energy according to peak-peak and second largest peak value; Whether ranging code user judging module, the decision content that is used to judge the time delay tap energy greater than threshold value, if greater than, then judgement detects the user and uses this ranging code; Otherwise judgement does not detect the user and uses this ranging code.
An embodiment according to ranging code checkout gear of the present invention also comprises the threshold value determination module, is used for determining threshold value according to the energy value of above-mentioned time delay tap, and sends to ranging code user judging module.Wherein, above-mentioned threshold value is the multiple of the third-largest peak value of time delay tap energy, perhaps the multiple of the average of all time delay tap energy.
According to an embodiment of ranging code checkout gear of the present invention, judge the energy value determination module when judging that described peak-peak is adjacent with second largest peak value, the decision content of time delay tap energy is made as described peak-peak and described second largest peak value sum.
According to an embodiment of ranging code checkout gear of the present invention, time delay tap energy acquisition module comprises following submodule: the distance measuring signal that the base station is received is transformed to the submodule of frequency-region signal by FFT; With described frequency-region signal with multiply each other with reference to ranging code after, be transformed to the submodule of time-domain signal by IFFT; The amplitude of described time-domain signal is carried out square, is obtained the submodule of the energy value on each time delay tap.
The method and apparatus that ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system of the present invention detects, whether adjacent the judgement that comes the user on the differentiating and processing ranging code of the time delay by judging the energy peak-peak and the time delay tap of energy second largest peak value reduced the false dismissal probability that ranging code detects.
Description of drawings
Fig. 1 comprises Fig. 1 a and Fig. 1 b; Wherein, Fig. 1 a illustrates the schematic diagram of wireless communication system; Fig. 1 b illustrates the block diagram that base station and terminal transmit and receive data;
Fig. 2 illustrates the simplification schematic diagram that the channel ranging code detects;
Fig. 3 illustrates the judgement flow process of the ranging code detection of prior art;
Fig. 4 comprises Fig. 4 a and Fig. 4 b; Wherein, Fig. 4 a illustrates an example of the frequency-region signal that ranging code modulation back is formed; Fig. 4 b illustrates an example of the sampling of frequency domain channel impulse response amplitude on the ranging code subcarrier;
Fig. 5 illustrates the distance measuring signal that receives postpones 100 and 1/8 sampling intervals with respect to time reference situation;
Fig. 6 illustrates the distance measuring signal that receives postpones 100 and 31/64 sampling intervals with respect to time reference situation;
Fig. 7 illustrates the flow chart of the detection method of ranging code of the present invention;
Fig. 8 illustrates the judgement flow process of an embodiment of the detection method of ranging code of the present invention;
Fig. 9 illustrates the structure chart of an embodiment of the checkout gear of ranging code of the present invention;
Figure 10 illustrates the structure chart of another embodiment of the checkout gear of ranging code of the present invention;
Figure 11 comprises Figure 11 a and Figure 11 b; Wherein, Figure 11 a illustrates the block diagram of basic OFDMA system; Figure 11 b illustrates the block diagram of SC-FDMA system;
Figure 12 illustrates the simplification schematic diagram of the channel ranging code detection of SC-FDMA system.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 4 a illustrates an example of the frequency-region signal that ranging code modulation back is formed.In Fig. 4 a, the OFDMA physical layer has been specified a range channel and the set of some special binary system pseudorandom ranging codes.For the emission of finding range effectively, each user concentrates from ranging code randomly and selects a ranging code.Then ranging code is passed through the BPSK modulation system, be modulated on the subcarrier of range channel bit of each subcarrier.The length of each ranging code is 144 bits, is modulated to respectively on 144 subcarriers.These 144 subcarriers further are divided into 36 groups, and every group comprises 4 continuous sub-carriers.
Fig. 4 b illustrates an example of the sampling of frequency domain channel impulse response amplitude on the ranging code subcarrier.Wherein, in Fig. 4 b, only express the amplitude information on each subcarrier, do not expressed phase information.
Fig. 5 illustrates the distance measuring signal that receives postpones 100 and 1/8 sampling intervals with respect to time reference situation.As shown in Figure 5, P1 value 19.1, P2 value 4.6, P3 value 4.0, threshold value are chosen for 2.5 times of P3.According to the decision procedure of prior art, with the P3 value of P1 value and 2.5 times relatively, because P1 (191)＞2.5 * P2 (4.0)=10, therefore detecting the user uses this ranging code.When receiving the integral multiple in nearly sampling interval actual time, the peak-peak of energy equally also has very high relative energy, so false dismissal probability is low.
Fig. 6 illustrates the distance measuring signal that receives postpones 100 and 31/64 sampling intervals with respect to time reference situation.As shown in Figure 6, P1 value 7.2, P2 value 6.8, P3 value 4.0, threshold value are chosen for 2.5 times of P3.According to the decision procedure of prior art, with the P3 of P1 and 2.5 times relatively, because P1 (7.2)＜2.5 * P3 (4)=10, therefore not detecting the user uses this ranging code.When receiving mid point between nearly two sampling intervals actual time, the peak-peak of energy and the second largest peak value of energy have much the same amplitude, and adjacent.
From the graph 5 and the example of Fig. 6 can see, when receiving the integral multiple (for example, 100 and 1/8) in nearly sampling interval actual time, can not cause very big false dismissal probability.But when receiving mid point (for example, 100 and 31/64) between nearly two sampling intervals actual time,, there is very big omission possibility because the peak-peak of energy reduces greatly with respect to the relative amplitude of other energy values.
Ranging code detecting method of the present invention is exactly characteristics of utilizing the channel impulse response distribute power, the decision method of redesign in the judging module, thus solve the ranging code omission problem that causes when time delay when distance measuring signal is not the integral multiple in sampling interval.Fig. 7 illustrates the flow chart of the detection method of ranging code of the present invention.
As shown in Figure 7, in step 702, the distance measuring signal that the base station is received carries out conversion and obtains energy on each time delay tap, and the energy on each time delay tap is sorted, and obtains the peak-peak and the second largest peak value of time delay tap energy.
In step 704, judge whether the peak-peak of the time delay tap energy tap time delay corresponding with second largest peak value adjacent, and according to whether the decision content of adjacent definite time delay tap energy.A kind of concrete realization is if the tap time delay of peak-peak and second largest peak value is non-conterminous, then the decision content of time delay tap energy is set to the peak-peak of time delay tap energy, otherwise, the decision content of determining the time delay tap energy according to the peak-peak and the second largest peak value of time delay tap energy, for example, the decision content that the peak-peak and the second largest peak value sum of time delay tap energy is made as the time delay tap energy.
In step 706, determine on ranging code, whether to detect the user according to the decision content and the threshold value of time delay tap energy.Choosing of threshold value can be, but be not limited to the multiple of the average of the multiple of the third-largest peak value of energy or all time delay tap energy.If the decision content of energy is greater than threshold value, then judgement detects the user and uses this ranging code; If the decision content of energy is not more than threshold value, then judgement does not detect the user and uses on the ranging code.
Fig. 8 illustrates the judgement flow process of an embodiment of the detection method of ranging code of the present invention.
As shown in Figure 8, in step 802, judging module of the present invention is to judge earlier whether the time delay tap of the peak-peak of energy and second largest peak value is adjacent, if non-conterminous, then execution in step 804, if adjacent, then execution in step 810.
In step 804, under the non-conterminous situation of time delay tap of the peak-peak of energy and second largest peak value, relatively with the peak-peak of energy and threshold value.If the peak-peak of energy is greater than threshold value, then judgement detects the user and uses this ranging code (step 806); If the peak-peak of energy is not more than threshold value, then judgement does not detect the user and uses this ranging code (step 808).
In step 810, under the adjacent situation of the time delay tap of the peak-peak of energy and second largest peak value, relatively with the peak-peak of energy and second largest peak value sum and certain threshold value.If the peak-peak of energy and second largest peak value sum are greater than threshold value, then judgement detects the user and uses this ranging code (step 812); If the peak-peak of energy and second largest peak value sum are not more than threshold value, then judgement does not detect the user and uses this ranging code (step 814).
In Fig. 7 and step shown in Figure 8, threshold value choose can but to be not limited to be the multiple of the third-largest peak value of time delay tap energy, concrete multiple is chosen relevant with empty inspection probability with system's patient false dismissal probability of institute, as, value is 2.0 to 3.0 times a third-largest energy value etc.Threshold value also can be chosen the multiple of the average of all time delay tap energy, and concrete multiple is chosen relevant with empty inspection probability with the patient false dismissal probability of system institute, is the average etc. of all time delay tap energy of 2.0 to 3.0 times as, value.Concrete multiple is chosen relevant with empty inspection probability with the patient false dismissal probability of system institute, is 2.0,2.5,3.0 times etc. as, value.。
The court verdict of the detection method of ranging code of the present invention is described respectively below with reference to the example of Fig. 5 and Fig. 6.In Fig. 5, the peak-peak of energy and second largest peak value are respectively P1 and P2, wherein, and P1 value 19.1, P2 value 4.6; Threshold value is chosen for 2.5 times of P3, and the P3 value is 4.0; The method according to this invention judges at first whether the time delay tap of P1 and P2 is adjacent, and as shown in Figure 5, P1 and P2 are non-conterminous; Whether judge P1 then greater than threshold value because P1=19.1＞2.5 * P3=10, the result of judgement be P1 greater than threshold value, use this ranging code so judgement detects the user.In Fig. 6, the peak-peak of energy and second largest peak value are respectively P1 and P2, wherein, and P1 value 7.2, P2 value 6.8; Threshold value is chosen for 2.5 times of P3, P3 value 4.0; The method according to this invention judges at first whether the time delay tap of P1 and P2 is adjacent, and P1 and P2 are adjacent as shown in Figure 6; Whether judge P1+P2 then greater than threshold value because p1+P2=7.2+6.8=14＞2.5*P3=10, the result of judgement be P1+P2 greater than threshold value, use this ranging code so judgement detects the user.From top example as can be seen,, can under the situation of Fig. 6, detect the user, thereby compare, reduce false dismissal probability with prior art by the detection method of ranging code of the present invention.
Fig. 9 illustrates the structure chart of an embodiment of the checkout gear of ranging code of the present invention.As shown in Figure 9, the checkout gear of ranging code comprises time delay tap energy acquisition module 91, judges energy value determination module 92 and ranging code user judging module 93.Wherein, the distance measuring signal that 91 pairs of base stations of time delay tap energy acquisition module receive carries out conversion, obtains the energy value of each time delay tap.Judge that energy value determination module 92 obtains the energy value of time delay tap from time delay tap energy acquisition module, judge whether peak-peak and second largest peak value in the time delay tap energy be adjacent, if it is adjacent, then determine the decision content of time delay tap energy according to peak-peak and second largest peak value, otherwise the decision content of time delay tap energy is made as the peak-peak of time delay tap energy, the decision content of the time delay tap energy determined is sent to ranging code user judging module 93.Ranging code user judging module 93 receives the decision content from the time delay tap energy of judging energy value determination module 92, and whether the decision content of judging the time delay tap energy greater than threshold value, if greater than, then adjudicate and detect the user and use this ranging code; Otherwise judgement does not detect the user and uses this ranging code.
Figure 10 illustrates the structure chart of another embodiment of the checkout gear of ranging code of the present invention.As shown in figure 10, the checkout gear of ranging code comprises time delay tap energy acquisition module 101, judges energy value determination module 102, ranging code user judging module 103 and threshold value determination module 104.Wherein, the description of time delay tap energy acquisition module 101, judgement energy value determination module 102 and ranging code user judging module 103 can be described referring to the correspondence of time delay tap energy acquisition module 91, judgement energy value determination module 92 and ranging code user judging module 93 among Fig. 9, for for purpose of brevity, be not described in detail at this.Threshold value determination module 104 is determined threshold value according to the time delay tap energy value that time delay tap energy acquisition module 101 obtains, and threshold value is sent to ranging code user judging module 103.Ranging code user judging module 103 receives from the decision content of the time delay tap energy of judging energy value determination module 102 with from the threshold value of threshold value determination module 104, whether the decision content of judging the time delay tap energy is greater than threshold value, if greater than, then judgement detects the user and uses this ranging code; Otherwise judgement does not detect the user and uses this ranging code.
According to the embodiment of checkout gear of the present invention, threshold settings is the multiple of the average of the multiple of the third-largest peak value of time delay tap energy or all time delay tap energy.According to the embodiment of checkout gear of the present invention, above-mentioned judgement energy value determination module is set at peak-peak and second largest peak value sum with the decision content of time delay tap energy when judging that peak-peak is adjacent with second largest peak value.
According to an embodiment of checkout gear of the present invention, above-mentioned time delay tap energy acquisition module comprises submodule: the distance measuring signal that the base station is received is transformed to the submodule of frequency-region signal by FFT; Frequency-region signal is transformed to the submodule of time-domain signal with the back of multiplying each other with reference to ranging code, by IFFT; The amplitude of time-domain signal is carried out square, is obtained the submodule of the energy value on each time delay tap.
It is to be noted, the detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system of the present invention and device, the scope of using is not limited to the orthogonal frequency division multiple access system of narrow sense, the OFMDA system of wireless metropolitan area network standard IEEE 802.16 (WiMAX) regulation for example, and comprise the orthogonal frequency division multiple access system of broad sense, the for example single-carrier frequency division multiple access among 3GPP LTE and the XG-PHS (Single Carrier-Frequency Division Multiple Access, SC-FDMA) system.
Figure 11 a illustrates basic OFDMA system.At transmitter, the data of input obtain importing constellation symbols through handling early stage.The constellation symbols of input is not more than N through going here and there and being converted to
FFTThe parallel constellation symbols on road.Parallel constellation symbols is mapped on the different subcarriers.Then by means of N
FFTThe IFFT conversion of point converts the OFDM modulation with also going here and there.Increase CP (Cyclic Prefix, prefix) so that guard time to be provided through the signal after the OFDM modulation, be used to the intersymbol interference that prevents that multipath from bringing.Signal is transmitted into wireless channel further by rf modulations by antenna.Be received the antenna reception of machine through the signal of wireless channel.Receiver by radio demodulating, remove CP, string and conversion, N
FFTPoint FFT, subcarrier are separated mapping, equilibrium, are also gone here and there operation such as conversion, finally obtain the data of exporting.
Figure 11 b illustrates the SC-FDMA system.With basic OFDMA systematic comparison, the transmitter of SC-FDMA system had increased N before the subcarrier mapping
DFT(N
DFT＜=N
FFT) some DFT operation.SC-FDMA is also referred to as DFT-S OFDMA sometimes.DFT has generated the frequency domain representation of incoming symbol.The subcarrier of SC-FDMA is mapped with dual mode, and a kind of is Continuous Mappings, and a kind of is distributed mapping.Adopt the SC-FDMA of Continuous Mappings to be called LFDMA again, adopt the SC-FDMA of distributed mapping to be called IFDMA again.
Figure 12 illustrates the simplification schematic diagram of the channel ranging code detection of SC-FDMA system.By Figure 12 and Fig. 2 more as can be seen, SC-FDMA system and basic OFDMA system are mainly distinct in the conversion of ranging code signal, and the judgement that conversion obtains behind the time delay tap energy realizes identical.The detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system of the present invention and device can be applied to the SC-FDMA system.Those skilled in the art can realize that according to instruction of the present invention the present invention uses in the SC-FDMA system.
The method and apparatus that OFDMA system uplink channel ranging code of the present invention detects, the whether adjacent judgement that comes the user on the differentiating and processing ranging code of the time delay tap of the time delay of the peak-peak by judging energy and the second largest peak value of energy, reduced the false dismissal probability that ranging code detects, tool has an enormous advantage.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (10)
1. the detection method of a ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system is characterized in that, comprising:
The distance measuring signal that receives is carried out obtaining after the conversion energy value of each time delay tap;
Whether peak-peak and the second largest peak value of judging described time delay tap energy be adjacent, if it is adjacent, then determine the decision content of time delay tap energy, otherwise the decision content of described time delay tap energy is made as the peak-peak of described time delay tap energy according to described peak-peak and described second largest peak value;
Determine whether to detect the user according to the decision content of described time delay tap energy and threshold value and use described ranging code.
2. the detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system according to claim 1 is characterized in that, described decision content and threshold value according to described time delay tap energy determines whether to detect the user and use the step of described ranging code to comprise:
Whether the decision content of judging described time delay tap energy greater than described threshold value, if greater than, then judgement detects the user and uses described ranging code; Otherwise judgement does not detect the user and uses described ranging code.
3. the detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system according to claim 1 and 2 is characterized in that, described threshold value is the multiple of the third-largest peak value of time delay tap energy, perhaps the multiple of the average of all time delay tap energy.
4. the detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system according to claim 1 and 2 is characterized in that, describedly determines that according to described peak-peak and described second largest peak value the step of the decision content of time delay tap energy comprises:
The decision content of described time delay tap energy is set at described peak-peak and described second largest peak value sum.
5. the detection method of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system according to claim 1 and 2 is characterized in that, describedly the distance measuring signal that receives is carried out the step that conversion obtains the energy value of each time delay comprises:
In the base station distance measuring signal that receives is transformed to frequency-region signal by FFT;
With described frequency-region signal with multiply each other with reference to ranging code after, be transformed to time-domain signal by IFFT;
The amplitude of described time-domain signal is carried out square, obtain the energy value on each time delay tap.
6. the checkout gear of a ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system is characterized in that, comprising:
Time delay tap energy acquisition module is used for the distance measuring signal that receives is carried out conversion, obtains the energy value of time delay tap;
Judge the energy value determination module, be used for judging whether described time delay tap energy peak-peak and second largest peak value be adjacent, if it is adjacent, then determine the decision content of time delay tap energy, otherwise the decision content of described time delay tap energy is set at the peak-peak of described time delay tap energy according to described peak-peak and described second largest peak value;
Whether ranging code user judging module, the decision content that is used to judge described time delay tap energy greater than threshold value, if greater than, then judgement detects the user and uses described ranging code; Otherwise judgement does not detect the user and uses described ranging code.
7. the checkout gear of ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system according to claim 6, it is characterized in that, also comprise the threshold value determination module, be used for determining described threshold value, and send to described ranging code user judging module according to the energy value of described time delay tap.
8. according to the checkout gear of claim 6 or 7 described ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, it is characterized in that described threshold value is the multiple of the third-largest peak value of time delay tap energy, perhaps the multiple of the average of all time delay tap energy.
9. according to the checkout gear of claim 6 or 7 described ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, it is characterized in that, described judgement energy value determination module is set at described peak-peak and described second largest peak value sum with the decision content of described time delay tap energy when judging that described peak-peak is adjacent with second largest peak value.
10. according to the checkout gear of claim 6 or 7 described ranging code of uplink channel of orthogonal frequency division multiple access (OFDMA) system, it is characterized in that described time delay tap energy acquisition module comprises:
The distance measuring signal that the base station is received is transformed to the submodule of frequency-region signal by FFT;
Described frequency-region signal is transformed to the submodule of time-domain signal with the back of multiplying each other with reference to ranging code, by IFFT;
The amplitude of described time-domain signal is carried out square to obtain the submodule of the energy value on each time delay tap.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909034A (en) * | 2010-06-22 | 2010-12-08 | 北京大学 | Passive optical network transmitting and receiving method and system based on single carrier frequency division multiple access |
| CN102315904A (en) * | 2011-09-05 | 2012-01-11 | 新邮通信设备有限公司 | Method for optimizing physical uplink control channel detection and measurement |
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2008
- 2008-09-23 CN CN200810211718A patent/CN101686217A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909034A (en) * | 2010-06-22 | 2010-12-08 | 北京大学 | Passive optical network transmitting and receiving method and system based on single carrier frequency division multiple access |
| CN101909034B (en) * | 2010-06-22 | 2013-08-07 | 北京大学 | Passive optical network transmitting and receiving method and system based on single carrier frequency division multiple access |
| CN102315904A (en) * | 2011-09-05 | 2012-01-11 | 新邮通信设备有限公司 | Method for optimizing physical uplink control channel detection and measurement |
| CN102315904B (en) * | 2011-09-05 | 2014-02-19 | 新邮通信设备有限公司 | Method for optimizing physical uplink control channel detection and measurement |
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