CN1541005A - Device and method for transferring signal from baseband to radi frequency in wireless communication system - Google Patents
Device and method for transferring signal from baseband to radi frequency in wireless communication system Download PDFInfo
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- CN1541005A CN1541005A CNA2003101119927A CN200310111992A CN1541005A CN 1541005 A CN1541005 A CN 1541005A CN A2003101119927 A CNA2003101119927 A CN A2003101119927A CN 200310111992 A CN200310111992 A CN 200310111992A CN 1541005 A CN1541005 A CN 1541005A
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- 238000000034 method Methods 0.000 title claims description 19
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- 238000009432 framing Methods 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 230000003139 buffering effect Effects 0.000 claims description 29
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Abstract
The device includes sender, receiver, framing device and frame recovery device. Framing device collects each signal needed to transmit from baseband to radio frequency, and recombines collected signals to generate K bits wide fame structure, which are sent to the sender. Frame recovery device recover each signal from K bits wide fame structure. The framing device is connected to the sender for sending K bits wide fame structure to the receiver. The receiver is connected to frame recovery device. The invention solves low rate of using bandwidth.
Description
Technical field
The present invention relates to field of wireless communication, especially relate to a kind ofly in wireless telecommunication system, the baseband portion of base station is to a kind of apparatus and method of radio frequency part transfer of data.
Background technology
In the wireless telecommunication system, the base station generally is divided into two parts, baseband portion and radio frequency part.Wherein baseband portion is finished modulatedemodulate reconciliation process numeral, base band.Radio frequency part is finished down-conversion, the transmitting-receiving of radio frequency amplification and radiofrequency signal.
Baseband portion and radio frequency part are generally done as a whole, are collectively referred to as the base station.A kind of configuration mode is also arranged, regard base band and radio frequency as relatively independent two parts.Radio frequency can be away from base band near antenna feeder, and the station of only being made up of radio frequency unit at this moment is called the far end radio frequency station.The direct benefit of bringing is to have reduced the forward signal loss that causes owing to antenna feeder, and the layout of base station is more prone to.
Be requirement of real time, existing base band radio frequency networking technology adopts directly multiplexing scheme, and the business datum that is about to required transmission is done string and conversion, is multiplexed into concurrently together earlier, sends out by optical fiber after the serialization again.At the far end radio frequency station, do clock and data recovery and string and conversion with opposite circuit, data are proposed.Can guarantee the real-time of data so well.
Because of the requirement of mobile communcations system accurate timing, also need the delivery time border; Because of the demand of control, maintenance, need be at two-way transmission communication signal; Because of reliability requirement, need be at two-way transfer check signal; Because of the requirement of accurate timing, also to transmit distance measuring signal.
A problem of bringing thus is, because in existing scheme, above-mentioned signal is multiplexed into preceding reverse data, causes bandwidth availability ratio seriously to descend, and has increased the demand of transmission bandwidth.More seriously, the figure place of supporting because of multiplexing demultiplexing device spare has discreteness, and directly the multiplexing bit number demand of bringing may limit the use of a collection of device just.Also because directly multiplexing, then sampling clock must be the integral multiple of the desired clock of preceding reverse baseband signal, and restriction increases, and design difficulty increases.
This problem has directly limited the maximum distal radio frequency station quantity that every pair of transmission line (for example optical fiber) is supported when causing cost rising, design difficulty to strengthen.And in wireless telecommunication system, because base station range is wide, transmission line is the resource that is of great value.Current programme can not address this problem well.
In existing scheme shown in Figure 1 (directly multiplex mode), from the radio frequency to the base band, in the various signals 11 of required transmission, establish the total N of effective business datum
DataBit, and be made as N such as other total number of bits such as time border, verification, range finding, communications
OtherVarious signals 11 send to receiver 14 by transmitter 13 after multiplexer 12 is multiplexing, revert to various signals 11 by demodulation multiplexer 15 again.If the desired sampled data speed of business datum is f
Data, because employing is directly multiplexing, then the sample frequency of multiplexer 12 and demodulation multiplexer 15 should be f
DataOr f
DataIntegral multiple, minimum is f
Data, be made as f for convenience of description
DataTotal transmission bandwidth demand is (N after then directly multiplexing
Data+ N
Other) f
Data
In mobile communcations system, traffic data rate is very high, and when especially a plurality of radio frequencies station chain or annular networking, data rate is higher.And other data, time border bits for example, check bit, the range finding bit, communication is than top grade, and needed bandwidth is minimum for business datum, almost can ignore, but they have still taken a plurality of bits with the sampling rate identical with business datum, and this is the basic reason of direct multiplex mode bandwidth usage inefficiency.Can calculate its bandwidth availability ratio approximates: N
Data/ (N
Data+ N
Other).And owing to the demand of mobile communcations system to time border, verification, range finding, communication, N
OtherBe at least 4, as seen its efficient is quite low.
If the bit wide of multiplexer 12 is the K bit, then K must be greater than N under the situation of frequency multiplication sampling
Data+ N
OtherThis is another design limit.And, when K is not equal to N
Data+ N
OtherThe time, also have (K-Nd
Ata-N
OtherThe bandwidth of)/K is wasted.
Summary of the invention
Technical problem to be solved by this invention provides in a kind of wireless telecommunication system base band to the device of radio signal transmission, solves the problem of prior art bandwidth usage inefficiency.
Another technical problem to be solved by this invention provides in a kind of wireless telecommunication system base band to the method for radio signal transmission, solves the problem of prior art bandwidth usage inefficiency.
For achieving the above object, the invention provides that base band comprises transmitter and receiver to the device of radio signal transmission in a kind of wireless telecommunication system, its characteristics are, also include: framing device, frame recovery device;
Described framing device is used to compile the various signals of base band to the required transmission of radio frequency, and its reorganization is generated K bit width frame structure, and described K bit width frame structure is sent to described transmitter; Described K bit width frame structure is that bit wide is the data structure of K bit, and it has comprised the various signals of required transmission from the base band to the radio frequency or from the radio frequency to the base band, and has implied the timing indication of base band to radio frequency;
Described frame recovery device is used for that described K bit width frame structure is reverted to base band to radio frequency or radio frequency and arrives the needed various signals of base band;
Described framing device connects described transmitter and sends described K bit width frame structure to it, and described transmitter sends to described receiver with described K bit width frame structure, and described receiver connects described frame recovery device and sends described K bit width frame structure to it.
Above-mentioned device, its characteristics are, also include K bit multiplexer and K bit demodulation multiplexer; Described K bit multiplexer is connected between described framing device and the described transmitter, is used for the multiplexing generation of described K bit width frame structure is suitable for the serial signal of long Distance Transmission and sends described transmitter to; Described transmitter sends to described receiver with described serial signal; Described K bit demodulation multiplexer is connected between described frame recovery device and the described receiver, and sends to described frame recovery device after the described serial signal that described receiver receives reverted to described K bit width frame structure.
Above-mentioned device, its characteristics are, all include the bit recombination circuit in described framing device and the described frame recovery device, described bit recombination circuit be used for the data transaction of original width to the K bit width or with the data transaction of K bit width to original width.
Above-mentioned device, its characteristics are, also include read-write pointer synchronizer in the described framing device, are used for doing between input and output the speed coupling.
Above-mentioned device, its characteristics are that described K bit width frame structure includes: frame header fields, check field, communication field, range finding/attribute field, other overhead field and data field.
The present invention provides also that base band is to the method for radio signal transmission in a kind of wireless telecommunication system, and its characteristics are, include following steps:
Step 1 is compiled the various signals of base band to the required transmission of radio frequency by the framing device, and its reorganization is generated K bit width frame structure, and the data-signal that will have a K bit width frame structure is sent to transmitter;
Step 2 sends to receiver by described transmitter with the data-signal of the described K of having bit width frame structure;
Step 3 sends the data-signal of the described K of having bit width frame structure to the frame recovery device by described receiver, by described frame recovery device described K bit width frame structure is carried out analyzing and processing again, recovers needed various information.
Above-mentioned method, its characteristics be, also includes in the described step 1 by K bit multiplexer the multiplexing generation of data-signal of the described K of having bit width frame structure is suitable for the serial signal of long Distance Transmission, and be sent to the step of described transmitter; Also include in the described step 2 by K bit demodulation multiplexer described serial signal is reverted to the data-signal of the described K of having bit width frame structure, and be sent to the step of described frame recovery device.
Above-mentioned method, its characteristics are, also comprise the coupling step of being mated between input timing and output timing by described framing device in the described step 1.
Above-mentioned method, its characteristics are that described coupling step adopts single buffering area, in read-write pointer sequencing control, between the read-write pointer enough boundary belts are set.
Above-mentioned method, its characteristics be, described coupling step adopts double buffering, staggers by the initial moment that makes read-write, is engraved in when guaranteeing any one and has only a pointer operation in the same buffering area.
Technique effect of the present invention is: the present invention saves the cardinal principle of bandwidth, be to compile base band to the needed various signals of radio frequency by the framing device, generate K bit width frame structure, in K bit width frame structure, the ratio of data field and overhead field no longer is subject to its original bit number, and can adjust by bit according to actual conditions, make the low speed expense, for example frame head, communication, verification or the like shared in more substantial data, thereby solved the limited problem of bandwidth availability ratio.
Further describe specific embodiments of the invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the scheme of prior art;
Fig. 2 is the signal transmitting apparatus of base band/radio frequency of proposing of the present invention;
Fig. 3 is the typical wide frame structure that the present invention uses;
Fig. 4 is the bit recombination circuit diagram to business datum;
Fig. 5 is the flow chart of steps that the invention provides method;
Read-write pointer synchronization principles figure when Fig. 6 is single buffering area;
Read-write pointer synchronization principles figure when Fig. 7 is double buffering.
Embodiment
Fig. 2 is for transmitting the structure drawing of device of data by the framing mode between the base band radio frequency.In this device, business datum no longer directly enters multiplexer 22, but in framing device 21, handle through a framing, converting a kind of specific frame structure to is K bit width frame structure 30, multiplexer 22 takes out data and carries out multiplexing from frame buffer zone 301 (see figure 3)s of K bit width frame structure 30, transmitter in base band/radio frequency interface 23 and receiver (figure do not show) send demodulation multiplexer 25 to then, and demodulation multiplexer 25 is filled into K bit width frame structure 30 in the frame recovery device 26 with data.
Fig. 3 is the schematic diagram of typical K bit width frame structure 30, and each frame is divided into (but being not limited to) following components: frame header fields, check field, communication field, range finding/attribute field, other overhead field, and data field.If the data field total length of every frame is H
DataOther outer according to this overhead field length of bit, divisor is H
OtherAs can be seen, the ratio of data field and overhead field no longer is subject to its original bit and counts N at this moment
DataAnd N
Other, and can adjust by bit according to actual conditions.For example at every frame overhead field length H
OtherUnder the fixing situation, can be by adjusting H
DataAdjust bandwidth availability ratio.Work as H
DataBig more, frame length is big more, and bandwidth availability ratio is high more.Thereby solved the limited problem of bandwidth availability ratio.The cardinal principle of bandwidth conservation is that it makes the low speed expense, frame head for example, and communication, verification or the like is shared in more substantial data.Its actual shared bandwidth is adjustable, low ratio.
Fig. 4 is the bit recombination circuit diagram schematic diagram to business datum, and it shows the handling principle to business datum.The original business datum width of input is N
DataBit, and the width of frame buffer zone 301 is the K bit.Therefore need realize from N through a bit recombination circuit 41
DataBit width is to the conversion of K bit width.At receiver side, the bit recombination through opposite recovers original business datum.
For data, the speed of input framing device should be identical with the speed of output framing device, so data shared bandwidth on link is N
Dataf
DataAnd according to data and expense the allocation proportion in frame structure, then expense shared bandwidth on link is N
Dataf
DataH
Other/ H
DataTotal transmission bandwidth on the link is data and expense sum, that is: N
Dataf
Data(H
Data+ H
Other)/H
DataRequire the sample frequency of multiplexer/demultiplexer this moment is f
Duplex=N
Dataf
Data(H
Data+ H
Other)/kH
DataBandwidth availability ratio can reach H
Data/ (H
Data+ H
Other).
The sample frequency of multiplexer/demultiplexer depends on f no longer fully
Data, promptly differing is decided to be f
DataOr f
DataIntegral multiple, and can be its minute several times.
With 12 carrier frequency sector cdma signals is example, specifies the saving of framing method for bandwidth.
The cdma signal of 12 carrier frequency sectors, business datum flow rate are f
Data=39.32M, width are N
Data=12bit.If the expense that increases is N
Other=4bit, in the then direct multiplexing scheme, multiplexer/demultiplexer optional sampling frequency is 39.32M, multiplexing ratio is at least N
Data+ N
Other=16, the total data rate on the link is 39.32*16=629.12M.Wherein the shared bandwidth of expense is 629.12M * 4/16=157.28.And in fact the required bandwidth of expense needs so greatly far from, if expense only needs the 10M bandwidth, then bandwidth availability ratio is about (39.32 * 12+10)/629.12=76%.
As to adopt framing mode, business datum flow rate still be f
Data=39.32M, width still are N
Data=12bit.If every frame data bit number is H
Data=1536, the overhead-bits number is H
Other=64.Multiplexing ratio still is 16: 1, and then the shared bandwidth of expense this moment is N
Dataf
DataH
Other/ H
Data=19.66M.Can satisfy overhead bandwidth demand (for example 10M).The total link bandwidth is: 39.32 * 12+19.66=491.5, the multiplexer sampling rate is 491.5/16=30.7M.Bandwidth availability ratio is (39.32 * 12+10)/491.5=98%.As seen the sampling rate to multiplexer requires to reduce, and bandwidth availability ratio brings up to 98% from 76%.
Fig. 5 is the flow chart of steps that the invention provides method, as shown in the figure, comprises the steps:
Read-write pointer synchronization principles figure when being single buffering area as shown in Figure 6.Because input rate is different with output speed, therefore need between input and output, make the speed coupling.Buffering area can be made the speed coupling.But, then need consider to read and write the problem of pointer collision as adopting single buffering area.
In this programme, readout clock or write among the clock one phase-locked and get by another through minute several times, therefore may produce instantaneous relative drift.And under the situation that has drift relatively, in read-write pointer sequencing control, must guarantee has enough boundary belts between the two, avoid bumping, and makes sense data invalid.
For example to the source end, the two will write or read same group of data in the section 0-T at the same time from same buffering area.It is slow to write clock, and readout clock is fast, and readout time is less than T like this.Catch up with and write pointer for avoiding reading pointer, must make the initial moment of read pointer lag behind write pointer.
The time of reading a frame is T
Fdata/ (f
Data+ f
Other).Because expense and data-linkage when requiring to read therefore must be at other a period of time Tf
Other/ (f
Data+ f
Other) in finish the operation of reading expense.For avoiding the read-write pointer collision of expense buffering area, can be arranged in the period except that reading expense the expense write time.
Single buffer mode though the buffering area demand is less, needs accurately complicated read-write pointer control.Adopt the double buffering mode can reduce complexity, improve reliability.Single in addition buffer mode, for the difficult processing of verification, because verification is to produce after data write, therefore the verification time slot is difficult to arrange in single buffering area, postpones verification unless adopt.Double buffering mechanism plays a protective role to writing also synchronously of verification.
Read-write pointer synchronization principles figure when being double buffering as Fig. 7, reading and writing with the business datum of up direction is example, at a N
DataCarry out the write operation of business datum in the buffer circle of bit continuously, and at a N
Data+ N
OtherRead continuously in the buffering area of bit.The initial moment of read-write staggers, and guarantees any one constantly, and same buffering area has only a pointer operation (non-reading promptly write), can effectively avoid reading and writing the abnormal conditions generation that pointer is collided.
For example, write side, at moment t0, write the data original position that pointer is positioned at second buffering area, and in the time period second buffering area write continuously at t0 to t0+T.And t0 this constantly, read in the original position that pointer is positioned at first buffering area, and read continuously in to first buffering area in the time period at t0 to t0+T, read content and comprise data and expense.By that analogy, when writing side, read side one and fix on second buffering area operation to first buffering area operation.Like this, owing to reserve enough boundary belts, may avoid reading and writing the pointer collision problem fully.
As adopt the double buffering mode, then the buffer pool size demand is: (N
Data+ N
Overhead) * 2.
Adopt the framing transmission means, exist and handle time-delay.Processing delay is for from being written to the time of reading, and when the double buffering mode, unidirectional (upstream or downstream) handle time-delay for writing the time of a buffering area, that is: N
Data/ f
Data, the time-delay that causes thus is less, can be incorporated into system handles time-delay and is deducted when signal processing.
Claims (10)
1, base band comprises transmitter and receiver to the device of radio signal transmission in a kind of wireless telecommunication system, it is characterized in that, also includes: framing device, frame recovery device;
Described framing device is used to compile the various signals of base band to the required transmission of radio frequency, and its reorganization is generated K bit width frame structure, and described K bit width frame structure is sent to described transmitter; Described K bit width frame structure is that bit wide is the data structure of K bit, and it has comprised the various signals of required transmission from the base band to the radio frequency or from the radio frequency to the base band, and has implied the timing indication of base band to radio frequency;
Described frame recovery device is used for that described K bit width frame structure is reverted to base band to radio frequency or radio frequency and arrives the needed various signals of base band;
Described framing device connects described transmitter and sends described K bit width frame structure to it, and described transmitter sends to described receiver with described K bit width frame structure, and described receiver connects described frame recovery device and sends described K bit width frame structure to it.
2, device according to claim 1 is characterized in that, also includes K bit multiplexer and K bit demodulation multiplexer; Described K bit multiplexer is connected between described framing device and the described transmitter, is used for the multiplexing generation of described K bit width frame structure is suitable for the serial signal of long Distance Transmission and sends described transmitter to; Described transmitter sends to described receiver with described serial signal; Described K bit demodulation multiplexer is connected between described frame recovery device and the described receiver, and sends to described frame recovery device after the described serial signal that described receiver receives reverted to described K bit width frame structure.
3, device according to claim 2, it is characterized in that, all include the bit recombination circuit in described framing device and the described frame recovery device, described bit recombination circuit be used for the data transaction of original width to the K bit width or with the data transaction of K bit width to original width.
4, device according to claim 2 is characterized in that, also includes read-write pointer synchronizer in the described framing device, is used for doing between input and output the speed coupling.
According to claim 1,2,3 or 4 described devices, it is characterized in that 5, described K bit width frame structure includes: frame header fields, check field, communication field, range finding/attribute field, other overhead field and data field.
6, base band is characterized in that to the method for radio signal transmission in a kind of wireless telecommunication system, includes following steps:
Step 1 is compiled the various signals of base band to the required transmission of radio frequency by the framing device, and its reorganization is generated K bit width frame structure, and the data-signal that will have a K bit width frame structure is sent to transmitter;
Step 2 sends to receiver by described transmitter with the data-signal of the described K of having bit width frame structure;
Step 3 sends the data-signal of the described K of having bit width frame structure to the frame recovery device by described receiver, by described frame recovery device described K bit width frame structure is carried out analyzing and processing again, recovers needed various information.
7, method according to claim 6, it is characterized in that, also include in the described step 1 by K bit multiplexer the multiplexing generation of data-signal of the described K of having bit width frame structure is suitable for the serial signal of long Distance Transmission, and be sent to the step of described transmitter; Also include in the described step 2 by K bit demodulation multiplexer described serial signal is reverted to the data-signal of the described K of having bit width frame structure, and be sent to the step of described frame recovery device.
8, according to claim 6 or 7 described methods, it is characterized in that, also comprise the coupling step of between input timing and output timing, mating in the described step 1 by described framing device.
9, method according to claim 8 is characterized in that, described coupling step adopts single buffering area, in read-write pointer sequencing control, between the read-write pointer enough boundary belts is set.
10, method according to claim 8 is characterized in that, described coupling step adopts double buffering, staggers by the initial moment that makes read-write, is engraved in when guaranteeing any one and has only a pointer operation in the same buffering area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101119927A CN1299521C (en) | 2003-10-28 | 2003-10-28 | Device and method for transferring signal from baseband to radi frequency in wireless communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101119927A CN1299521C (en) | 2003-10-28 | 2003-10-28 | Device and method for transferring signal from baseband to radi frequency in wireless communication system |
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| CN1541005A true CN1541005A (en) | 2004-10-27 |
| CN1299521C CN1299521C (en) | 2007-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110708611A (en) * | 2013-06-28 | 2020-01-17 | 三星电子株式会社 | Transmitter, receiver, and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9000338A (en) * | 1989-06-02 | 1991-01-02 | Koninkl Philips Electronics Nv | DIGITAL TRANSMISSION SYSTEM, TRANSMITTER AND RECEIVER FOR USE IN THE TRANSMISSION SYSTEM AND RECORD CARRIED OUT WITH THE TRANSMITTER IN THE FORM OF A RECORDING DEVICE. |
| US5072296A (en) * | 1990-02-23 | 1991-12-10 | Massachusetts Institute Of Technology | Video frame reduction/reconstruction method and apparatus |
| JP2002047260A (en) * | 2000-07-26 | 2002-02-12 | Mitsubishi Gas Chem Co Inc | METHOD FOR STABILIZING alpha-AMINO ACID AMIDE |
| JP4520032B2 (en) * | 2000-08-17 | 2010-08-04 | パナソニック株式会社 | Header compression apparatus and header compression method |
| US6807525B1 (en) * | 2000-10-31 | 2004-10-19 | Telogy Networks, Inc. | SID frame detection with human auditory perception compensation |
| US7082569B2 (en) * | 2001-01-17 | 2006-07-25 | Outlooksoft Corporation | Systems and methods providing dynamic spreadsheet functionality |
| US7215679B2 (en) * | 2001-08-30 | 2007-05-08 | Thomson Licensing | Method, apparatus and data structure enabling multiple channel data stream transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110708611A (en) * | 2013-06-28 | 2020-01-17 | 三星电子株式会社 | Transmitter, receiver, and control method thereof |
| CN110708611B (en) * | 2013-06-28 | 2021-04-23 | 三星电子株式会社 | Transmitter, receiver, and control method thereof |
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| CN1299521C (en) | 2007-02-07 |
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