CN1211966C - Method and system for fast synchronization of uplink and receiver for base station's access channel - Google Patents

Method and system for fast synchronization of uplink and receiver for base station's access channel Download PDF

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Publication number
CN1211966C
CN1211966C CN01815249.XA CN01815249A CN1211966C CN 1211966 C CN1211966 C CN 1211966C CN 01815249 A CN01815249 A CN 01815249A CN 1211966 C CN1211966 C CN 1211966C
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base station
mobile radio
access
time
radio station
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CN1452821A (en
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方莉
张元�
拉盖施·塔玛拉卡
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Linkair Communications Inc
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Linkair Communications Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal

Abstract

The present invention relates to a method for quickly synchronizing an up link in a synchronizing code division multiple access communication system. The present invention is characterized in that the method comprises the following procedures that (1) a mobile station is divided into a plurality of access time slots from access channels comprising an up link according to information sent by a base station, and a free access time slot is selected; (2) the mobile station sends access codes at a certain moment in the free access time slot; (3) a base station detects the access codes, and determines delay adjusting information of the mobile station; (4) the base station sends the delay adjusting information to the mobile station; (5) the mobile station adjusts the sending time of the thereof according to the received delay adjusting information, so that a subsequently sent signal arrives at the base station in standard access time.

Description

Up link fast synchronization method and system
Technical field
The present invention relates to wireless communication system, relate in particular to S-CDMA (CDMA) communication system, relate more specifically in synchronous code division multiple access communication system, up link be carried out synchronous method and system fast.
Background technology
In recent years, radio communication has become a most active aspect in the communications field, and cdma system is owing to have big capacity, soft capacity, soft handover, high speech quality and low transmitting power and special advantages such as anti-interference and strong security are shown one's talent it, develop rapidly, and become the one preferred technique of third generation cellular system.
CDMA is a kind of modulation and multiple access interconnection technique based on spread spectrum communication.In cdma communication system, the used signal of different user transmission information is to distinguish with different separately coded sequences.Because cdma system uses different sign indicating number types to distinguish channel, thereby all be overlapped from frequency domain and these channels of time domain, they all take identical frequency range and time in other words, therefore the performance of cdma system depends on the characteristic quality of yard type to a great extent, and promptly the degree of the phase mutual interference of a plurality of interchannels will be a key factor for definite cdma system channel capacity and characteristic.
Referring to Fig. 1, it has provided a kind of schematic diagram of cell mobile communication systems, and hexagon inside is a sub-district, and radio communication is to carry out between the base station of inside, a sub-district and mobile radio station.There are a base station and a plurality of mobile radio station in inside, sub-district, and each mobile radio station uses independently channel respectively, promptly different spectrum-spreading address codes, and carry out radio communication with the base station simultaneously.General Definition is down link (downlink) from the base station to the mobile radio station, otherwise is referred to as up link (uplink) from the mobile radio station to the base station.
In cdma system, channel is distinguished mutually by the different sign indicating number that is adopted, thereby the correlation of this intersymbol is crucial.That is to say that and if only if that to distribute to the intersymbol of each self-channel uncorrelated each other and obtain to guarantee for the independence of this interchannel.When receiver utilized given signal to recover its coherent signal, these receivers should not adopted the influence of the channel of other coding.
Yet, in traditional cdma system, IS95 system for example, its spreading code that adopts is to be produced by the pseudo noise code sequence Walsh sign indicating number with minimal cross correlations value and maximum autocorrelation value.Because the IS95 system is asynchronous cdma system, its up channel, promptly to be sent to signal of base station be asynchronous communication to all mobile radio stations, because the pseudo noise sequence from different mobile radio stations can not be synchronous, the pseudo noise code sequence of different mobile radio stations each other can not quadrature, and therefore the spread-spectrum signal in same frequency range and same time can form great interference each other, and promptly multiple access disturbs, this interference has not only significantly reduced channel capacity, but also has increased the complexity of power control.
For the multiple access of eliminating above-mentioned asynchronous communication system disturbs, require to use spreading code with zero cross correlation value, promptly orthogonal code (is not only quadrature and zero correlation window in addition! ), and because the orthogonal property between the orthogonal code sequence is to set up under the fully synchronous prerequisite of sign indicating number sequence, therefore require between these yards sequence fully synchronously, therefore, in synchronous CDMA system, up, down link be very important synchronously.
In cdma system, down link be to realize easily synchronously because all signals send out from single base station.But the many of difficulty are wanted in the synchronous realization of up link, each mobile radio station is different from the distance of base station, and it is also different to send signal delay, and mobile radio station is not known the size of the distance of own and base station, can't adjust the transmission signal time, reach base station asynchronous so cause mobile radio station to transmit a signal to.Particularly, inevitable multipath fading and occlusion effect in the radio communication become difficult more owing to making the synchronous foundation of up link.
In recent years, at the uplink synchronisation problem that realizes cdma system some technical schemes have been proposed in the prior art, for example Chinese patent 97118934 has disclosed a kind of foundation and maintenance scheme that is used for the synchronous CDMA system uplink synchronisation, but the method is more loaded down with trivial details, it is to solve uplink synchronous with complicated frame structure and control command to set up process, and a plurality of mobile radio stations are set up simultaneously synchronously.
Therefore, urgent need is a kind of in the prior art carries out synchronous method fast to up link.
Summary of the invention
First purpose of the present invention is to provide a kind of and in synchronous code division multiple access communication system up link is carried out synchronous method fast, to solve existing the problems referred to above and defective in the prior art.
Second purpose of the present invention is to provide a kind of and in synchronous code division multiple access communication system up link carried out synchronous system fast.
For realizing above-mentioned first purpose, the invention provides and a kind ofly in synchronous code division multiple access communication system, up link is carried out fast synchronous method, it is characterized in that may further comprise the steps:
(1) mobile radio station from a plurality of access slots that the access channel that is contained in up link is divided into, is selected an idle access slot according to the information that the base station sends;
(2) the sometime transmission access code of mobile radio station in described idle access slot;
(3) described access code is detected in the base station, determines the time delay adjustment information of described mobile radio station;
(4) base station sends described time delay adjustment information to mobile radio station;
(5) mobile radio station is adjusted its transmitting time according to the described time delay adjustment information of receiving, makes its signal that sends subsequently arrive the base station in the turn-on time of standard.
For realizing above-mentioned second purpose, the invention provides and a kind ofly in synchronous code division multiple access communication system, up link is carried out fast synchronous system, described synchronous code division multiple access communication system comprises at least one mobile radio station and at least one base station,
Described quick synchro system is characterised in that:
Described at least one mobile radio station comprises:
A plurality of access slots that the information that is used for sending according to the base station is divided into from the access channel that is contained in up link are selected the device of an idle access slot;
Be used for the device that sends access code sometime in described idle access slot;
Described at least one base station comprises:
The device that is used to detect described access code and determines the time delay adjustment information of mobile radio station;
Be used for sending the device of described time delay adjustment information to mobile radio station; And
Described at least one mobile radio station also comprises:
Being used for adjusting signal sending time according to the described time delay adjustment information of receiving makes the signal that is sent arrive the device of base station in the turn-on time of standard.
Wherein, describedly be used to detect described access code and determine that the device of the time delay adjustment information of mobile radio station comprises:
Demodulator is used for mobile radio station is carried out demodulation at the access code signal that the access channel that is contained in up link sends;
Low pass filter is used for the signal after the demodulation is carried out low-pass filtering;
Matched filter is used for carrying out related operation through the signal of low-pass filtering and the access code sequence of storage in advance;
The maximum value search circuit is used for according to relevant parameter, determines the threshold value of the output signal of described matched filter;
Amplitude limiter is used for according to described threshold value output useful signal;
Sliding correlation detector is used for calculating described access code arrives described base station experience from described mobile radio station time according to described useful signal; And
The calculations of offset module is used for the time and the standard time of described experience are compared, computing time side-play amount.
In synchronous code division multiple access communication system, up link is carried out synchronous method or system fast according to of the present invention, can realize simultaneously the synchronous reception between the uplink signal of a plurality of mobile radio stations fast, thereby reduce the interference of interchannel, the channel capacity of increase system, and owing to adopt unique access code and special matched filter structure, therefore synchronization accuracy is very high, adjust number of times seldom, the synchronous foundation that more can guarantee up link is effective fast, and method is simple, is easy to realize.
Summary of drawings
In conjunction with the drawings to the detailed description of best mode for carrying out the invention, above-mentioned and other feature and advantage of the present invention will be more obvious.
Fig. 1 is a kind of structural representation of cell mobile communication systems;
Fig. 2 is the flow chart that up link is carried out synchronous fast method in synchronous code division multiple access communication system according to of the present invention;
Fig. 3 is that the base station is detected access code and the detail flowchart of definite time delay adjustment information;
Fig. 4 is applied by the structural representation of mobile radio station to the up link access channel of base station among the present invention;
Fig. 5 shows the characteristic schematic diagram after access code is by the matched filter that is used to store identical access code;
Fig. 6 shows the characteristic schematic diagram after access code is by the matched filter that is used to store different access codes;
Fig. 7 is the structural representation that up link is carried out receiver for base station's access channel used in the synchronous fast system in synchronous code division multiple access communication system according to of the present invention.
Preferred forms of the present invention
Describe preferred forms of the present invention below in detail.
Fig. 2 is the flow chart that up link is carried out synchronous fast method in synchronous code division multiple access communication system according to of the present invention.
After the mobile radio station start, the mobile radio station user at first receives the information of being sent by the base station from down link, carry out frequency correction and with the frame synchronization and the bit synchronization of system, and obtain the information of available Access Channel Slot.Mobile radio station according to the information of above-mentioned available Access Channel Slot, from a plurality of access slots that the access channel that is contained in up link is divided into, is selected an idle access slot in step 201.Then, in step 202, the sometime transmission fixing access code of mobile radio station in selected idle time slot.Concrete structure about access channel will describe with reference to Fig. 4 later.
Thereafter, in step 203, the base station is detected the access code that mobile radio station sends, and determines the time delay adjustment information of mobile radio station.
In step 204, the base station sends above-mentioned time delay adjustment information to mobile radio station.
In step 205, mobile radio station is adjusted its transmitting time according to the time delay adjustment information of receiving, makes its signal that sends subsequently arrive the base station in the turn-on time of standard.
Fig. 3 is that the base station is detected access code and the detail flowchart of definite time delay adjustment information.Flow process shown in Figure 3 has constituted the step 203 among Fig. 2.
As shown in Figure 3, in step 2031, the signal of receiving is carried out demodulation, low-pass filtering, matched filtering and related operation.In step 2032, utilize maximum value search circuit and relevant parameter, determine the threshold value of described signal.In step 2033, by comparing, by amplitude limiter output useful signal with described threshold value.In step 2034, utilize sliding correlation detector to calculate access code and arrive the time that the base station experienced from mobile radio station.In step 2035, the time and standard time of described experience compared, computing time side-play amount, as above-mentioned time delay adjustment information.
Fig. 4 is applied by the structural representation of mobile radio station to the up link access channel of base station among the present invention.As shown in Figure 4, access channel is divided into M time slot, when mobile radio station is attempted inserting, each mobile radio station is assigned to a time slot, insert, finally make subscriber signal arrive the base station time position of a standard in the time slot for this reason, arrive the base station synchronously to reach each mobile station signal of up link.For guaranteeing that mobile radio station inserts in normal place, mobile radio station will send the long code word in N position and (take NT in a time slot C).Because distributing to a time slot of access channel is KT C(T C=1/f C, f CBe chip speed: 1.2288Mcps), so mobile radio station sends the original position scope of code word between 0-(K-N) Tc.Sending N bit word T in addition CDo not send signal.
The access code of the present invention's use is a kind of spreading code of uniqueness in addition, and this access code is made of three parts, and access code length is the N position, so preceding N/3 position is decided to be sequence 1, back N/3 position is a sequence 2, and the middle N/3 position 0 of mending has the characteristic of orthogonal complement between sequence 1 and the sequence 2.
To the user in the sub-district, can use fixing a group of access sign indicating number to insert, but can select different time slots.
When mobile radio station inserts at every turn, be a time slot (KT in the M that distributes to an access channel time slot C) the interior access code of fixing that sends.Because the user is when beginning to insert, and do not know that whether own signal is the normal place that inserts, so transmitting time (transmitting time that the N bit word is the 1st) is decided to be a fixed value S after arriving the base station.
Secondly, receiver for base station's access channel is with each time slot (KT C) calculate the deviation of the signal that mobile radio station sends for unit.The access channel receiver of base station is at each different access slot, the time of advent of the signal energy computation mobile station signal by receiving each mobile radio station user, and it is compared with the time of standard, calculate the gap of the subscriber signal time of advent and standard on-position, send the time delay adjustment information of mobile radio station transmitting time then by down link to.By this time delay adjustment information, mobile radio station user's controller is adjusted the transmitting time that the user inserts code word next time, and the time of inserting signal arrival base station up to the user is the standard time.
Fig. 5 shows the characteristic schematic diagram after access code is by the matched filter that is used to store identical access code, and the submaximum value all is less than or equal to 0 as can be seen, and the main peak value is very big.
Fig. 6 shows the characteristic schematic diagram after access code is by the matched filter that is used to store different access codes, and its cross-correlation peak value is very little with respect to auto-correlation main peak value as can be seen.
By in conjunction with Fig. 2 and Fig. 3 description to method of the present invention, those skilled in the art can be susceptible at an easy rate in this area, of the present inventionly carry out fast to up link that synchronous system possesses following feature in synchronous code division multiple access communication system.
At least one mobile radio station that is included in the synchronous code division multiple access communication system comprises:
A plurality of access slots that the information that is used for sending according to the base station is divided into from the access channel that is contained in up link are selected the device of an idle access slot;
Be used for the device that sends access code sometime in this free time access slot;
At least one base station that is included in the synchronous code division multiple access communication system comprises:
The device that is used to detect access code and determines the time delay adjustment information of mobile radio station;
Be used for sending the device of this time delay adjustment information to mobile radio station; And
Above-mentioned at least one mobile radio station also comprises:
Being used for adjusting signal sending time according to the described time delay adjustment information of receiving makes the signal that is sent arrive the device of base station in the turn-on time of standard.
More specifically say, above-mentionedly be used to detect described access code and determine that the device of the time delay adjustment information of mobile radio station comprises:
Demodulator is used for the signal of receiving is carried out demodulation;
Low pass filter is used for the signal after the demodulation is carried out low-pass filtering;
Matched filter is used for carrying out related operation through the signal of low-pass filtering and the access code sequence of storage in advance;
The maximum value search circuit is used for according to relevant parameter, determines the threshold value of the output signal of matched filter;
Amplitude limiter, according to threshold value, the output useful signal;
Sliding correlation detector is used for calculating access code arrives the base station experience from mobile radio station time according to useful signal; And
The calculations of offset module is used for the time and the standard time of above-mentioned experience are compared, computing time side-play amount, this time offset is the time delay adjustment information.
Previously described each parts that are contained in the base station can be arranged in the receiver for base station's access channel.
Fig. 7 is the structure that schematically shows this access channel receiver, and this access channel receiver is used for the up link of synchronous code division multiple access communication system is carried out fast synchronously.
As shown in Figure 7, label 601 is represented demodulator, and 604 represent low pass filter, and 607 represent matched filter, and 608 represent amplitude limiter, and 609 represent the maximum value search circuit, and 610 represent sliding correlation detector, and 611 represent the time migration computing module.
Suppose that the real part that the user sends code word is x (t), imaginary part is y (t), and then the signal after the modulation is:
C(t)＝x(t)cos(ω ct)+y(t)sin(ω ct)
If do not consider The noise, then the signal that receives of base station is:
C(t)＝x(t)cos(ω ct)+y(t)sin(ω ct)
Access signal I road signal 602 behind demodulator 601 from mobile radio station is:
I ( t ) = C ( t ) × cos ( ω c t ) = [ x ( t ) cos ( ω c t ) + y ( t ) sin ( ω c t ) ] × cos ( ω c t )
= 1 2 x ( t ) + 1 2 x ( t ) cos ( 2 ω c t ) + 1 2 y ( t ) sin ( 2 ω c t )
Through low pass filter 604, filter high-frequency signal, 605 signals are: I ( t ) = 1 2 x ( t ) Equally, the access signal Q road signal 603 behind demodulator 601 from mobile radio station is:
Q ( t ) = C ( t ) × sin ( ω c t ) = [ x ( t ) cos ( ω c t ) + y ( t ) sin ( ω c t ) ] × sin ( ω c t )
= 1 2 y ( t ) - 1 2 y ( t ) cos ( 2 ω c t ) + 1 2 x ( t ) sin ( 2 ω c t )
Through low pass filter 604, filter high-frequency signal, 606 signals are: Q ( t ) = 1 2 y ( t )
To send into special matched filter 607 through the two paths of signals behind the low pass filter, filter has been stored the access code sequence, and then the output offset of matched filter falls autocorrelative all the positive submaximum values of code word, and making autocorrelative submaximum is zero, or is negative.
The output signal of matched filter is passed through maximum value search module 609 and amplitude limiter 608 simultaneously.Maximum value search module 609 is found out maximum value from the output signal of matched filter 607, with the product of its value and the parameter threshold value as back amplitude limiter 608.By behind the amplitude limiter 608, the value former state greater than threshold value in the energy value of all inputs is exported, and will filter less than the amount of this threshold value, is output as 0, has just reduced auto-correlation submaximum, cross-correlation peak value, noise effectively to calculating the influence of peak position like this.
The output signal of amplitude limiter 608 is sent into next stage sliding correlation detector (length is L) 610, and purpose is to seek the position of maximum L adjacent value from 2K value.Promptly seek last peaked position (if plural equal maximum is arranged in the 2K value then get last position) from 2K value, promptly the user arrives the time of base station.
With the time of the subscriber signal arrival base station that calculates, compare with normal place, in time migration computing module 611, obtain side-play amount, produce delay control command DCC (Delay Control Command) order.
Postpone control command (or claiming time delay adjustment information) and send mobile radio station to, after the mobile radio station user receives the information of base station, adjust its transmitting time, make it to arrive signal of base station final standard compliant turn-on time at down link.
When in allowed limits the time, showing and insert successfully from the deviation of the value of sliding correlation detector output and normal place.If successfully export " 1 " signal, special command of DCC output simultaneously tells the user to insert success; If unsuccessful, output " 0 " signal, DCC is for adjusting order.
Exceed adjustable extent if the mobile radio station user who calculates inserts signal ceiling capacity the window's position, illustrate and adjust failure.In this case, the base station wants down link to send to special DCC order of user, and the user sends the access pulse once more, inserts again.
More than describe and can clearly illustrate, owing to use access channel in up link, and access channel is divided into different time slots, make more mobile radio station connecting system simultaneously, guarantee the quick foundation of up link.Owing to adopted the combination of access code and matched filter, guaranteed to calculate the accuracy that mobile radio station sends the time-delay deviation of signal in addition, quickened the process of setting up synchronously of up link.
Though below described preferred forms of the present invention in conjunction with the accompanying drawings in detail, for those skilled in the art in this area, can make various modifications and changes, and not deviate from scope of the present invention and essence.Therefore, scope of the present invention only is defined by the claims.

Claims (8)

1. one kind is carried out synchronous method fast to up link in synchronous code division multiple access communication system, it is characterized in that may further comprise the steps:
(1) mobile radio station from a plurality of access slots that the access channel that is contained in up link is divided into, is selected an idle access slot according to the information that the base station sends;
(2) the sometime transmission access code of mobile radio station in described idle access slot;
(3) described access code is detected in the base station, determines the time delay adjustment information of described mobile radio station;
(4) base station sends described time delay adjustment information to mobile radio station;
(5) mobile radio station is adjusted its transmitting time according to the described time delay adjustment information of receiving, makes its signal that sends subsequently arrive the base station in the turn-on time of standard; Described step (3) is included in the following steps of carrying out on the base station:
The signal of receiving is carried out demodulation, low-pass filtering, matched filtering and related operation, output signal then;
Utilize maximum value search circuit and relevant parameter, determine the threshold value of described signal;
Energy value and described threshold value by described signal compare, amplitude limiter output useful signal;
Utilize sliding correlation detector to calculate described access code arrives described base station experience from described mobile radio station time according to described useful signal;
Time and standard time to described experience compare, computing time side-play amount, described time offset is described time delay adjustment information.
2. method according to claim 1 is characterized in that in the described step (2), and described access code is that the fixed time in described idle access slot sends.
3. method according to claim 1 is characterized in that the described step that the signal of receiving is carried out matched filtering comprises: with the described signal of receiving be stored in access code sequence in the matched filter in advance and carry out the step of related operation.
4. according to each method in the claim 1 to 3, it is characterized in that: described access code is a kind of N position spreading code, wherein before the N/3 position be sequence 1, back N/3 position is a sequence 2, middle N/3 position is 0, has the characteristic of orthogonal complement between sequence 1 and the sequence 2.
5. one kind is carried out synchronous system fast to up link in synchronous code division multiple access communication system, and described synchronous code division multiple access communication system comprises at least one mobile radio station and at least one base station,
Described quick synchro system is characterised in that:
Described at least one mobile radio station comprises:
A plurality of access slots that the information that is used for sending according to the base station is divided into from the access channel that is contained in up link are selected the device of an idle access slot;
Be used for the device that sends access code sometime in described idle access slot;
Described at least one base station comprises:
The device that is used to detect described access code and determines the time delay adjustment information of mobile radio station;
Be used for sending the device of described time delay adjustment information to mobile radio station; And
Described at least one mobile radio station also comprises:
Being used for adjusting signal sending time according to the described time delay adjustment information of receiving makes the signal that is sent arrive the device of base station in the turn-on time of standard;
Described mobile radio station and described base station are coupled;
A plurality of access slots that the described information that is used for sending according to the base station is divided into from the access channel that is contained in up link select the device of an idle access slot and the described device that sends sign indicating number sometime that is used in described idle access slot to be coupled, and send access code to described base station; Describedly be used to detect access code and determine that the device and the described device that is used for sending to mobile radio station described time delay adjustment information of the time delay adjustment information of mobile radio station are coupled, receive and detect described access code, and to described mobile radio station transmission delay adjustment information; Described mobile radio station receives the time delay adjustment information of described base station, and according to the time of described time delay adjustment information adjustment to described base station transmit signals.
6. system according to claim 5 is characterized in that describedly being used to detect described access code and determining that the device of the time delay adjustment information of mobile radio station comprises:
Demodulator is used for the signal of receiving is carried out demodulation;
Low pass filter is used for the signal after the demodulation is carried out low-pass filtering;
Matched filter is used for carrying out related operation through the signal of low-pass filtering and the access code sequence of storage in advance;
The maximum value search circuit is used for according to relevant parameter, determines the threshold value of the output signal of described matched filter;
Amplitude limiter, according to described threshold value, the output useful signal;
Sliding correlation detector is used for calculating described access code arrives described base station experience from described mobile radio station time according to described useful signal; And
The calculations of offset module is used for the time and the standard time of described experience are compared, computing time side-play amount, described time offset is described time delay adjustment information.
7. system according to claim 6 is characterized in that the described device that sends access code sometime that is used in described idle access slot sends access code at fixed time.
8. according to each system in the claim 5 to 7, it is characterized in that: described access code is a kind of N position spreading code, wherein before the N/3 position be sequence 1, back N/3 position is a sequence 2, middle N/3 position is 0, has the characteristic of orthogonal complement between sequence 1 and the sequence 2.
CN01815249.XA 2001-07-13 2001-07-13 Method and system for fast synchronization of uplink and receiver for base station's access channel Expired - Fee Related CN1211966C (en)

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