CN1197561A - Data tranmission method, and a cellular radio system - Google Patents
Data tranmission method, and a cellular radio system Download PDFInfo
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- CN1197561A CN1197561A CN95197948A CN95197948A CN1197561A CN 1197561 A CN1197561 A CN 1197561A CN 95197948 A CN95197948 A CN 95197948A CN 95197948 A CN95197948 A CN 95197948A CN 1197561 A CN1197561 A CN 1197561A
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Abstract
The invention relates to a data transmission method in a cellular radio system and a cellular radio system, which comprises in each cell at least one base station, and a number of subscriber terminal equipments connected to one or more base stations, the transmitter of said system comprising means for multiplying the signal of each user by more than one pseudorandom sequences. For enabling a high spectral efficiency and advantageous interference cancellation, the transceiver of the system comprises means for multiplying the signal of the user by more than one pseudorandom sequence, the data transfer rate of the signal substantially remaining the same. The transmitter further comprises means for transmitting the signals of different users multiplied by the same pseudorandom sequences distinguished from each other by means of time-division.
Description
The field of the invention
The present invention relates to a kind of method that data send in cellular wireless system, in each sub-district, comprise a base station at least, and many user terminals that are attached to one or more base stations, each user's signal is multiplied each other by one or more pseudo random sequences in this system.
Technical background
The present invention is particularly suitable for the cellular wireless system of employing code division multiple access.Code division multiple access (CDMA) is a kind of multi-address method, and it is based on spread spectrum, and except former FDMA and TDMA method, it has been used for cellular communication system recently.CDMA had many advantages compared with former method, spectrum efficiency height for example, and frequency planning is simple.
In CDMA, user's narrow-band digital signal is much wide that the extended code of bandwidth is taken on the relative broadband mutually by having compared with data-signal.The bandwidth of using in known test macro is for example 1.25MHz, 10MHz and 25MHz.By multiplying each other, data-signal expands to employed all frequency bands.All users use identical frequency band to launch simultaneously.Use an extended code in each connection between base station and the travelling carriage, receiver can be distinguished user's signal mutually based on the extended code that each user uses.Fig. 1 represents that wherein, the transverse axis table time, the longitudinal axis is represented pseudo noise code according to the CDMA transmission of technology in the past.The transmission 100-106 of different user distinguishes emission simultaneously mutually with different sign indicating numbers on same frequency.It also is well-known providing more than a sign indicating number for a user, but this is just in order to improve message transmission rate.Be provided the user of two extended codes, for example, can one the multiply each other part of the sign indicating number that will be launched of sign indicating number, with another yard part that multiplies each other, so just with a sign indicating number transmitting users compare, realized the transmission capacity of twice.
Sef-adapting filter in the receiver and required signal Synchronization, required signal Synchronization are based on that extended code discerns.By using same extended code identical when launching to multiply each other, data-signal is reduced original frequency band in receiver.In the ideal case, both uncorrelated by other extended code multiplied signals, do not revert to original arrowband yet.Therefore, in desired signal, they resemble noise.Make great efforts the extended code of selective system, make their not cross-correlation, in other words, their quadratures.In practice, extended code is not relevant not at all, and other users' signal makes required distorted signals, thereby makes the detection of desired signal become complicated.The interference that the user produces each other is known as multiple access and disturbs.
The quality of transmission depends on number of users, particularly in the transmission direction from the base station to the terminal equipment.Number of users is many more in the system, and the employed power of base station is just high more.This produces peripheral cell and disturbs.
In the past, capable Interference Cancellation was accepted in people's butt joint, made the quality of received signal be enhanced under the help of offsetting.Before this, interference cancellation method is mainly used in plan in the base station, can not realize because the operation that requires on terminal equipment is too complicated.
The present invention's general introduction
The objective of the invention is to realize a kind of data transmission method, it further improves spectrum efficiency, particularly in the transmission direction from the base station to the terminal equipment.The present invention also aims to realize a kind of like this data transmission method, it makes interference cancellation method also can use on subscriber terminal equipment.Another object of the present invention is to realize a kind of like this data transmission method, and it makes grand diversity simpler than before this.
This is to reach by the method that proposes in introduction, the signal that it is characterized in that the user is multiplied each other by a plurality of pseudo random sequences, it is identical that signal transmission rate keeps in fact, and distinguished mutually by time division way by the different subscriber signal that same pseudo random sequence multiplies each other.
Another object of the present invention is a cellular wireless system, it comprises at least one base station in each sub-district, and a plurality of subscriber terminal equipments that are connected to one or more base stations, the transmitter of described system comprises with multiply each other each user's the device of signal of one or more pseudo random sequences.Cellular wireless system of the present invention is characterised in that, the transceiver of system is with the multiply each other device of subscriber signal of a plurality of pseudo random sequences, it is identical that the transmission rate of signal keeps in fact, and transmitter comprises the device that is used to send the signal that passes through the different user that the time-division distinguishes mutually that is multiplied each other by same pseudo random sequence.
Therefore, by on the subscriber terminal equipment signal on several information channels being used time good detection, method of the present invention makes from the base station to the spectrum efficiency of terminal equipment transmit direction and improves.Be often referred to the equipment of handling and further sending several channel informations in this base station.
In the method for the invention, information channel becomes powerful parallel form, and it makes the interference cancellation algorithm on the terminal equipment to use effectively.The complexity of the Interference Cancellation of terminal equipment is the linear function of parallel information channel, and this is impossible in traditional CDMA Channel.Powerful parallel transmission can make time-division transmission in the transmission direction from the base station to the terminal equipment.Like this, terminal equipment can more effectively utilize the time interval that is not used to transmit, and for example is used to monitor the time interval other base stations or that be used to handle received signal.
Brief description
Below, in conjunction with the accompanying drawings and reference example, the present invention will be narrated in more detail, wherein:
Fig. 1 represents previously disclosed existing transmission technology,
Fig. 2 represents to use an example of the cellular wireless system of method of the present invention,
Fig. 3 a-3c represent according to the present invention by the time assign to distinguish the different replaceable method of different user signal,
Fig. 4 is the block diagram of the structure of expression cellular wireless system of the present invention, and
Fig. 5 represents the block diagram of example of structure of the terminal equipment of cellular wireless system of the present invention.
Preferred implementation of the present invention
Fig. 2 represents preferably to use the part of the cellular wireless system of method of the present invention.Cellular wireless networks comprises a base station 200 and many subscriber terminal equipment 202-206 that is connected to the base station at least in each sub-district.Base station controller is passed through in the base station, mobile services switching centre, or similar devices, and the calling of exchange from terminal equipment is to public telephone network or another terminal equipment.
All terminal equipments to base station 200, then, according to the method for prior art, are distinguished the emission of different terminal equipment in same frequency emission based on the extended code of each terminal equipment use.The method according to this invention, the base station distributes N sign indicating number to a user from obtainable sign indicating number sequence set, and this user transmits information to subscriber terminal equipment concurrently, however message transmission rate is consistent in fact.In the method for the invention, the base station sends N sign indicating number to terminal equipment to each sequence of symhols, and only sends a sign indicating number in traditional method.Because message transmission rate keeps identical in fact, in the method for the invention, do not continue in entire frame with the transmission of the code element of the frame of each connection of several parallel transmissions.Like this, can in several users, use the time-division.The transmission of several different users can send by same extended code, and the user can by the time the mutually difference of assigning to.
The possible implementation that a kind of parallel time-division sends shown in Fig. 3 a, transverse axis express time wherein, the longitudinal axis is represented different extended codes.In the example shown in the figure, each independently sends each user's signal 300-306 in the time slot at one, makes each user's sign indicating number be multiplied each other by an extended code, and first user is multiplied each other by sign indicating number 100-106 in this example.Different users can use different sign indicating numbers.Different users also can have the sign indicating number of different numbers.
Disclosed time-division parallel transmission method makes can implement interference cancellation algorithm in subscriber terminal equipment.In this case, be useful signal to the signal of terminal equipment, rather than the multiple access interference signal.And, the parameter that terminal equipment is estimated seldom: L * M, wherein L represents the number in path, M represents the diversity of antenna.Terminal equipment can further be carried out Interference Cancellation with the algorithm as the base station, because terminal equipment has the ability of handling the transmission that arrives in the time that the signal to other-end equipment is sent out.The complexity of the Interference Cancellation of terminal equipment is the linear function of parallel transmission number.
In the time of the signal of other-end equipment, the base station can monitor the emission of other base stations in base station.Parallel transmission also makes terminal equipment send received signal to the base station on signaling channel and whether suffers deep fade, perhaps the input information of whether failing because of other reasons.So new time slot of this terminal equipment is distributed in the base station, and it is notified to terminal equipment and attempts to do new emission.Also can carry out and re-emission, promptly be exactly, by the parallel information of in a such time slot that is being other connection reservations originally, re-emissioning by so-called insertion.This connection will be lost its partial information.
In the method for the invention, parallel emission can accomplished in many ways.Usually, different user is at the parallel channel of the different numbers of different time-gap.A kind of possibility is above disclosed mode, distributes an independently time slot for each user.This requires the accurate coordination of base station, but can realize that terminal equipment does not cause interference mutually.Yet its restriction is the peak power that high power signals increases base station.The high speed high power connects will use several time slots.
Another possibility is to have only the parallel emission of a few users, and other users use legacy transmission.This mode represents wherein have a user 314 to use parallel emission by using several extended codes in Fig. 3 b, other users 310,312 are by using complete frame of an extended code emission.In this a kind of method, parallel transmitting users 314 will be disturbed mutually with other users, still, by distributing the extended code of enough numbers to concurrent user, this interference can be limited to be several code elements during in, like this, interference can be eliminated by chnnel coding.According to the parallel emission of this method be particularly suitable for the user in the base station nearby situation, described user's emission is considered that can accept disturbed condition can carry out on low-power.These user's available interference counteracting methods high power of decaying disturbs.
Another possibility is that the user is divided into two or more groups, and distributes an independently time slot to the transmission of each group.This represents that in Fig. 3 c wherein the user is divided into two group 316 and 318, they by the time the mutually difference of assigning to.In group, user's extended code is distinguished mutually, and the member of group can obtain different number object codes.
Another possibility is to distribute time slot in order each user according to the sign indicating number of needs.Like this, the interference between the sub-district just is randomized.
Now, let us is studied the structure of cellular wireless system of the present invention by the block diagram of Fig. 4.Transmitter comprises an encoder 408 and a channel encoder 406, and wherein encoder 408 carries out speech coding with the signal that is launched, and 406 pairs of signals through speech coding of channel encoder carry out chnnel coding.After this, channel encoded signal is sent to device 404, and wherein the mode known with a kind of person skilled in the art of the data-signal that will be launched is expanded sign indicating number and multiplies each other.In transmitter of the present invention, user's signal is multiplied each other by not only extended code in device 404, it by the time assign to distinguish in some the signal from these users at least.About this technology, the time-division emission can realize with mode the same in known tdma system.In this way the signal of Huo Deing is further launched by antenna 400 via a radio-frequency unit 402.
Transmitter also comprises control and calculation element 410, and it controls the operation of above-mentioned part.This control and calculation element are typically realized with a processor.Control device also available other electronic components realization, for example discreet logic devices.This device also comprises naturally except other elements of expressing in the drawings, for example filter and transducer, and this is obviously easily to see to the people who knows this technology, but for the sake of clarity, they are expression in the drawings.
Comprise with the multiply each other device 404 of the code element that will send of one or more extended codes according to the transceiver of cellular wireless system of the present invention.The mutually riding of user's extended code carried out the known mode of people itself of knowing this technology.
Fig. 5 is the block diagram of expression according to the general structure of CDMA terminal equipment receiver of the present invention.Receiver comprises an antenna 500, is applied to converter apparatus 504 by its received signal via radio frequency part 502, and received signal converts digital form in 504.With this form digitlization signal further be applied to demodulating equipment 506, therein, signal carries out relevant with used extended code.The output signal 506 of demodulating equipment, it is converted into original narrow band signal, is applied to Interference Cancellation device 514, therein, with known interference cancellation method signal is carried out Interference Cancellation.Purified interference signals and be applied to channel decoder 508, and from there to other parts of receiver, for example voice decoder 510.
Receiver also comprises control and calculation element 512, and it controls the operation of above-mentioned part.Control and calculation element are typically realized with a processor.Also available other the electronic component of control device realizes, for example special logic.This device also comprises naturally except other parts shown in the figure those, for example filter and transducer, this to the people that knows this technology clearly, but for the sake of clarity, they are expression in the drawings.
Though the present invention with reference to the accompanying drawings with reference to example above open, obviously the present invention is not limited to this, but in the scope of not leaving appended claim, it can do multi-form modification.
Claims (15)
1. a kind of data transmission method in cellular wireless system, comprise at least one base station (200) in each sub-district, with a plurality of subscriber terminal equipments (202-206) that are connected to one or more base stations, each user's signal is multiplied each other by one or more pseudo random sequences in this system, it is characterized in that: user's signal is multiplied each other more than a pseudo random sequence, it is identical that the data transfer rate of signal keeps in fact, and, the different subscriber signal that is multiplied each other by same pseudo random sequence by the time difference mutually of assigning to.
2. the method as requiring in the claim 1 is characterized in that time slot independently is assigned to each user's emission.
3. the method as requiring in the claim 1 is characterized in that the user is divided into two or more groups, and one independently time slot be assigned to the transmission of each group.
4. the method as requiring in the claim 1 is characterized in that each user distributes time slot in order according to the sign indicating number of a requirement.
5. the method as requiring in the claim 1 is characterized in that several time slots are assigned to the user's of big capacity of needs or high transfer rate emission.
6. the method as requiring in the claim 1 is characterized in that each user receives by a signal multiplying each other of pseudo random sequence independently on all time.
7. the method as requiring in the claim 1 is characterized in that described method is applied to the transmission direction from the base station to the subscriber terminal equipment.
8. the method as requiring in the claim 7 is characterized in that receiver handles the signal that receives on those time slots of received signal not.
9. the method as requiring in the claim 7 is characterized in that carrying out to received signal Interference Cancellation.
10. the method as requiring in the claim 7 is characterized in that receiver monitors the emission of neighbor base station during the time slot of received signal not.
11. cellular wireless system, it comprises at least one base station (200) in each sub-district, with a plurality of subscriber terminal equipments (202-206) that are connected to one or more base stations, the transmitter of described system comprises to be used more than the multiply each other device (404) of each subscriber signal of a pseudo random sequence, the transceiver that it is characterized in that system comprises to be used more than the multiply each other device (404) of each subscriber signal of a pseudo random sequence, it is identical that the message transmission rate of signal keeps in fact, also be transmitter comprise be used to send different user multiplied each other by same pseudo random sequence pass through the time device (404 of the signal of difference mutually of assigning to, 410,402).
12., it is characterized in that the transceiver of system comprises the device (404,410) that is used for sending at independent time slot the signal that is used for each user as the cellular wireless system that requires in the claim 11.
13. as the cellular wireless system that requires in the claim 11, the transceiver that it is characterized in that system comprises and is used for the user is divided into two or more groups and send the device (404,410) of the signal of each user's group at time slot independently.
14. the cellular wireless system as requiring in the claim 11 is characterized in that this transceiver is the transceiver of a base station.
15. the cellular wireless system as requiring in the claim 14 is characterized in that the receiver of the subscriber terminal equipment of system comprises the device (514) that is used for Interference Cancellation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197948A CN1101624C (en) | 1995-08-31 | 1995-08-31 | A data transmission method and a cellular radio system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95197948A CN1101624C (en) | 1995-08-31 | 1995-08-31 | A data transmission method and a cellular radio system |
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| Publication Number | Publication Date |
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| CN1197561A true CN1197561A (en) | 1998-10-28 |
| CN1101624C CN1101624C (en) | 2003-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95197948A Expired - Lifetime CN1101624C (en) | 1995-08-31 | 1995-08-31 | A data transmission method and a cellular radio system |
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| CN (1) | CN1101624C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161666B (en) * | 2007-09-18 | 2010-07-14 | 陈培豪 | Method for preparing main hydrolyzate by hydrolyzing plant fiber raw material with concentrated sulfuric acid |
| CN101695104B (en) * | 2009-09-24 | 2012-03-21 | 深圳市同洲电子股份有限公司 | Method for requesting server by digital TV terminal and related equipment thereof |
-
1995
- 1995-08-31 CN CN95197948A patent/CN1101624C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161666B (en) * | 2007-09-18 | 2010-07-14 | 陈培豪 | Method for preparing main hydrolyzate by hydrolyzing plant fiber raw material with concentrated sulfuric acid |
| CN101695104B (en) * | 2009-09-24 | 2012-03-21 | 深圳市同洲电子股份有限公司 | Method for requesting server by digital TV terminal and related equipment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1101624C (en) | 2003-02-12 |
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Owner name: NOKIA NETWORKS OY Free format text: FORMER NAME OR ADDRESS: NOKIA NETWORKS OY Owner name: NOKIA NETWORKS OY Free format text: FORMER NAME OR ADDRESS: NOKIA TELECOMMUNICATIONS OY |
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Address after: Espoo, Finland Patentee after: NOKIA Corp. Address before: Espoo, Finland Patentee before: NOKIA NETWORKS OY Address after: Espoo, Finland Patentee after: NOKIA NETWORKS OY Address before: Espoo, Finland Patentee before: Nokia Telecommunications Oy |
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