CN101272189B - TD-SCDMA signal source development system based on ADS - Google Patents
TD-SCDMA signal source development system based on ADS Download PDFInfo
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Abstract
A developing system of a TD-SCDMA signal source based on an ADS comprises an ideal signal generating module, a noise module and an ADS adding module; the ideal signal generating module comprises a signal source sub-module and a signal generating sub-module; in the noise module, a signal power is switched into a noise power, then switched into a Gaussian noise and double channels of adding back I/Q are distributed; the process comprises: an accumulated power is divided by 250 to obtain a signal average power, then extracted and divided into two channels, multiplied a standard noise source, divided by a square root of a two-time signal-to-noise to obtain the noise of the two channels of I/Q which are respectively added back to obtain a common TD-SCDMA signal that is weakened by multidiameter and is provided with a white Gaussian noise, in the ADS adding module, the obtained I/Q signal is added to the noise signal, then switching the I/Q signal of two channels into a complex signal of one channel through a plurality of converters to obtain a TD-SCDMA signal. The invention has the advantages of good applicability, high flexibility and low cost.
Description
Technical field
The present invention relates to a kind of development system of TD-SCDMA signal source.
Background technology
The world today has entered the information age of develop rapidly, and people expect and can, in time reliably, not be subjected to space-time restrictedly to carry out information interchange whenever and wherever possible.Mobile communication is as quick, portable, reliable personnel communications easily, can solve people and aprowl move the requirement that object on the attitude carrier communicates contact with fixed terminal or other, thereby obtained develop rapidly, all obtained huge development at aspects such as transmission quality and transmittabilities.But, mobile communication technology not can, also can not come to a halt because of the achievement of today.On the contrary, with respect to the requirement of people to communication quality and transmittability, mobile communication technology also can, and should further be researched and developed.
At present, China has had the mobile radio communication and the maximum mobile communication subscriber of global maximum, and mobile subscriber's quantity surpasses 100,000,000, and this numeral is also in quick growth.Yet along with mobile subscriber's growth and people requirement to the mobile communication business diversification, the existing second generation (2G) mobile communication system no matter frequency spectrum resource still can provide professional aspect, all can not satisfy the demand that mobile communication business develops.Under the support of the Ministry of Information Industry, each operator and equipment vendor, the 3G standard TD-SCDMA that China independently has releases and throws successively commercialization, carried out TD-SCDMA scale try net in ten big cities, and each large equipment merchant and operator also will invest in the development and the exploitation of the new equipment of TD-SCDMA energetically.
Signal source is as a part in the communication system, can directly influence the quality of communication, therefore, no matter be 2G or 3G, WCDMA or TD-SCDMA, the development of signal source and realization all are crucial, yet, the signal source that each large equipment merchant sells is quite expensive, and can only generate a kind of signal.
Summary of the invention
For poor for applicability, the very flexible that overcomes existing TD-SCDMA signal source, the deficiency that cost is high, the development system that the invention provides that a kind of applicability is good, flexibility is strong, cost is low based on the TD-SCDMA signal source of ADS.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of development system of the TD-SCDMA signal source based on ADS, comprise ideal signal generation module, noise module and ADS summation module, described ideal signal generation module comprises: the signal source submodule, be used to the device that can generate the TD-SCDMA primary signal that utilizes ADS to carry, primary signal is uplink and downlink, and up-downgoing TS has synchronous code interval separately; Signal generates submodule, and each the road downstream signal that is used for the signal source submodule is produced is by power splitter and low-converter, and addition respectively then obtains baseband signal I/Q two-way by upconverter and weak channel again; Each road upward signal that the signal source submodule produces directly through weak channel, obtains baseband signal I/Q two-way by down-conversion respectively then, obtains through the weak TD signal of multipath;
In the described noise module, convert signal power to noise power, become Gaussian noise again, and distribute add-back I/Q two-way; Processing procedure is: earlier with integral power divided by 250, obtain average power signal, then, evolution is divided into two-way, multiply by standard noise source, root mean square divided by 2 times of signal to noise ratios, just obtain the noise of I/Q two-way, add back respectively then, obtain weak and have a general TD-SCDMA signal of white Gaussian noise through multipath;
In the ADS summation module, with i/q signal and the noise signal addition that obtains, again the transducer of I/Q two paths of signals by plural number become one tunnel complex signal, obtain the TD-SCDMA baseband signal.
As preferred a kind of scheme: generate in the submodule at described signal, TD signal through the weak and white Gaussian noise of multipath, utilize the filter on one 16 rank to carry out matched filtering and connect the Matlab module again, the TD signal data of gathering is reappeared on the Matlab platform, and write the Matlab program data are carried out multi-faceted test: position, numerical value, the average of each time slot power, variance to the up-downgoing synchronous code compare.
Technical conceive of the present invention is: the physical layer channel of TD-SCDMA contains four-layer structure, is respectively: system-frame (system frame); Radio frames (radio frame); Subframe (sunframe); Time slot/code element (time solt/code).In fact, exist the superframe (super frame) and the multi-frame (multi frame) of excessive usefulness between system-frame and the radio frames, system's frame length 3 hours 16 minutes 36 seconds comprises 2048 superframes, can calculate the long 5760ms of each superframe; A superframe has 2 kinds of structures, and a kind of is that 48 TCH multi-frames constitute, and another kind is made of 24 Countrol multi-frames; A TCH multi-frame contains 12 radio frames, and a Countrol multi-frame contains 24 radio frames, and so, a superframe contains 48 * 12=24 * 24=576 radio frames, a system-frame contains 576 * 2048=1179648 radio frames, can be regarded as each wireless frame length 10ms; A radio frames contains 2 subframes, each 5ms, and subframe is the Basic Transmission Unit of TD-SCDMA, also can be called TD-SCDMA frame (TD-SCDMA frame); A subframe contains 10 time slots, comprise 7 main time slots and 3 special time slots (Ts0～Ts6, DwPTS, UpPTS, GP1).
We will realize the TD signal source, mainly will simulate the sequential of subframe exactly, and subframe is the Basic Transmission Unit of TD-SCDMA, as long as subframe can realize that the work that signal source realizes has also just been finished.From the above, subframe has comprised 10 time slots, 7 main time slots and 3 special time slots.
Main time slot is TS0～TS6, and its structure has two kinds, generally speaking all comprises information data area, midamble, guard interval.A main time slot contains between 2 information data areas, and each contains 352 code elements, and midamble district (midamble) contains 144 code elements, contains 16 code elements between protection zone (GP3), amounts to 864 code elements.Comprise transmission information between information data area, usefulness be QPSK modulation, midamble is used for path and measures some parameter as training sequence (training sequence), the effect of guard interval is to avoid phase mutual interference between the time slot.This is the same section of 2 kinds of structures.
Two kinds of structures difference with several special symbol sign indicating numbers, first kind of structure TFCI sign indicating number not necessarily has the TPC/SS sign indicating number, is mainly used in the TS0 of control channel; Second kind of structure do not contain the TFCI sign indicating number, but contains the TPC/SS sign indicating number, is mainly used in control physical layer channel and digital physical layer channel.
TFCI: transformat is in conjunction with indication code, and the radio frames of every 10ms sends once
TPC: the transmitting power control code, every 5ms subframe sends once, makes the TD-SCDMA system can carry out fast power control like this.
SS: the simultaneous bias sign indicating number, every 5ms subframe sends once, is used to adjust step-length.
TFCI, TPC, the factor is identical with information data area frequently in the exhibition of SS, and the different exhibition factor frequently can influence transmission rate information.
By above-mentioned, what comprise between information data area is transmission information, so the binary element between information data area can be represented with pseudo random sequence; And the code element of guard interval should be complete 0, is used for isolating two time slots; How assignment will decide according to channel needs transport property for midamble interval and specific code.
Special time slot has 3, is respectively DwPTS, UpPTS, GP1; Dwpts, the down-going synchronous time slot is made up of descending synchronous code (SYNC_DL) and 32 code elements (GP2) of 64 code elements.UpPTS, the uplink synchronous time slot is made up of uplink synchronous code (SYNC_UL) and 32 code elements (GP2) of 128 code elements.GP1 is the main protection interval, and 96 code elements are arranged.
The descending synchronous code of 64 code elements has 32 kinds of combinations, and each combination is called a code character, and the uplink synchronous code of 128 code elements has 256 kinds of various combinations, also is divided into 32 groups, and every group has 8 kinds of combinations.A code character base station of sign and 8 up code characters of a descending synchronous code, therefore, realize down-going synchronous, the current descending synchronous code that adopts will be identified, and to realize uplink synchronous, wherein adopt a group of the pairing 8 groups of uplink synchronous codes of descending synchronous code to be identified exactly.In addition, basic midamble and down-going synchronous code character also have corresponding relation, and basic midamble has 128 code elements, and 128 kinds of combinations are arranged, and is divided into 32 groups, so which group one group of corresponding 4 groups of basic midamble of descending synchronous code adopts, are determined by the base station.
The present invention designs a kind of signal source, makes the price of its cost well below equipment vendor, and in flexibility, practicality, is better than expensive single-minded signal source on the applicability.The method that we adopt software and hardware to combine, (as ADS) obtains appropriate signal on computers with large-scale eda software, be sent to again on traditional hardware signal source and obtain physical signalling, thereby only need carrying out Programming Design on computers, we just can obtain the signal of communication that we need, obviously, this is a kind of cheapness, implementation accurately and flexibly.
The realization in sort signal source will produce very big attraction to the developer and the telecommunication service operator of communication equipment, will be the powerful competitor in aforementioned high price special signal source.
Beneficial effect of the present invention mainly shows: applicability is good, flexibility is strong, cost is low.
Description of drawings
Fig. 1 is signal occurring principle figure of the present invention.
Fig. 2 is a TD-SCDMA physical channel structure of the present invention.
Fig. 3 is the weak signal source block diagram of band multipath of the present invention.
Fig. 4 is a part of schematic diagram of noise modular circuit of the present invention.
Fig. 5 is another part schematic diagram of noise modular circuit of the present invention.
Fig. 6 is a terminal connection hardware block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 6, a kind of development system of the TD-SCDMA signal source based on ADS comprises ideal signal generation module, noise module and ADS summation module, and described ideal signal generation module comprises:
The signal source submodule is used to the device that can generate the TD-SCDMA primary signal that utilizes ADS to carry, and primary signal is uplink and downlink, and up-downgoing TS has synchronous code interval separately; Signal generates submodule, and each the road downstream signal that is used for the signal source submodule is produced is by power splitter and low-converter, and addition respectively then obtains baseband signal I/Q two-way by upconverter and weak channel again; Each road upward signal that the signal source submodule produces directly through weak channel, obtains baseband signal I/Q two-way by down-conversion respectively then, obtains through the weak TD signal of multipath;
In the described noise module, convert signal power to noise power, becoming Gaussian noise, and distribute add-back I/Q two-way; Processing procedure is: earlier with integral power divided by 250, obtain average power signal, then, evolution is divided into two-way, multiply by standard noise source, root mean square divided by 2 times of signal to noise ratios, just obtain the noise of I/Q two-way, add back respectively then, obtain weak and have a general TD-SCDMA signal of white Gaussian noise through multipath;
In the ADS summation module, with i/q signal and the noise signal addition that obtains, again the transducer of I/Q two paths of signals by plural number become one tunnel complex signal, obtain the TD-SCDMA baseband signal.
Generate in the submodule at described signal, TD signal through the weak and white Gaussian noise of multipath, utilize the filter on one 16 rank to carry out matched filtering and connect the Matlab module again, the TD signal data of gathering is reappeared on the Matlab platform, and write the Matlab program data are carried out multi-faceted test: position, numerical value, the average of each time slot power, variance to the up-downgoing synchronous code compare.
Fig. 1 is the system block diagram of this research approach, as seen from the figure, whole system adopts the software control hardware mode, and mainly be divided into four modules: first module is a software module, the modeling and simulation of signal, channel is all finished in software environment, and the software of mainly using is ADS and Matlab.Other modules all belong to hardware module, computer links to each other with the conventional vector signal source by various wave points, and the signal of communication that obtains is transferred to signal source, signal source just can produce corresponding physical signalling, last VSA is a test module, and whether be used for testing the signal that obtains correct.
In Fig. 2, the TD-SCDMA physical channel of TD-SCDMA system regulation comprises four-layer structure: superframe (Super Frame), radio frames (Radio Frame), subframe (Sub frame) and time slot (Timeslot).The long 720ms of superframe is made up of 72 radio frames, each is wireless frame length 10ms, and TD-SCDMA is divided into each radio frames again the subframe of two 5ms.Each subframe is the conventional time slot of 675us and 3 special time slot DwPTS (descending pilot frequency time slot), GP (protection at interval) and UpPTS (uplink pilot time slot) formation by 7 length.Conventional time slot is as transmitting user data or control information, and Ts0 always distributes to down link in these 7 conventional time slots, and the fixing descending time slot that is used as comes the transmitting system broadcast message.And Ts1 always distributes to up link, and other time slot can be configured to upstream or downstream as required flexibly.Separate by a transfer point (Switching point) between the time slot of up link and the time slot of down link.The DwPTS time slot is used for sending descending synchronous code (SYNC_DL), and the DwPTS in each subframe (SYNC_DL) is descending pilot frequency and designing synchronously; GP is complete 0 guard interval, and protection is spaced apart 75us; And the UpPTS in the subframe (SYNC_UL) is ascending pilot frequency and designing synchronously.
In Fig. 3, on function, circuit is divided into several big modules designs: ideal signal generation module, multipath channel module, noise module, signal testing module etc.ADS carries a device that can generate the TD-SCDMA primary signal, and this device is unit with TS, can be divided into uplink and downlink, and up-downgoing TS has synchronous code interval separately, and tranmitting frequency is at 1900MHZ.In building the ideal signal generative circuit, this device is responsible for the signal that provides the most original, is crucial parts.The workflow of circuit is as follows: after signal source module is carried out the standard setting, the signal of its generation is by each power splitter, actual conditions according to uplink and downlink signals, upward signal is respectively by the weak channel of multipath, carry out down-conversion again, the baseband signal that obtains the I/Q two-way is respectively by the noise module; Downstream signal earlier carries out addition through after the down-conversion, passes through the up-conversion module again, and frequency is transferred to behind the radio-frequency carrier by the weak channel of multipath; And then down-conversion is by the noise module.So just obtain uplink and downlink signals,, just obtain, test with the Matlab module after can allowing it by the root raised cosine filter on one 16 rank through the weak compound TD baseband signal of multipath with its addition through the weak and white Gaussian noise of multipath.Baseband signal is carried out the radiofrequency signal that up-conversion just obtains TD, can test by VSA software.
The function of Matlab module is to obtain the TD signal that ADS generates, the TD signal data of gathering is reappeared on the Matlab platform, and write the Matlab program data are carried out multi-faceted test, mainly be that position, numerical value, the average of each time slot power, variance to the up-downgoing synchronous code compares, consistent to guarantee the signal that ADS generates with designed signal.Vector signal analysis software VSA, it has mistake analysis tools such as adaptive equalization, can analyze debugging to the TD radiofrequency signal, mainly comprise the symbol sequential mistake, filter mistake, DAC overflows, IQ imbalance, quadrature time lag, IQ skew and other RF problem.
Fig. 4 is a noise module circuit diagram 1, and the difficult point of plus noise module is that the power of noise changes with signal, and our demand generally all is to provide a signal to noise ratio, adds corresponding noise then.Under the prerequisite of known signal to noise ratio, but signal power is to change in time, and therefore the noise of adding up also is time dependent, and changes with the change of signal power.The main thought of building the noise module is: statistics a period of time signal power, to average, and the unit's of being multiplied by noise divided by signal to noise ratio, is added to this result on the signal as the random noise of following a period of time.What get during this period of time is the time of 250 points.Circuit diagram is more loaded down with trivial details, mainly be divided into two modules, a module is responsible for calculating the power of 250 points, the another one module is responsible for controlling the output that keeps stable, promptly remain in the time of current 250 points, last 250 some power of output, one to next 250 points, just change the power of preceding 250 points of current relatively 250 points into.Roughly flow process is as follows, and input signal has three, is respectively time signal, Q, I road signal after three time slots add up.Time signal is used for determining 250 points that because a frame is 5ms, one has 6400 points, through conversion time signal is become a signal, the x axle that just is equivalent to original reference is the time, has been corresponding point now, then to 250 deliverys, thus every 250 just make zero once.Controlled signal A.
The signal on Q road and I road is added up after respectively square and is just obtained the power of current chip, has added individual RAM module after the quadratic sum addition, because will realize 250 add up, and need be with the storage of individual short time; Between also added the little module of signal format conversion.After adding up, also need zero clearing from newly adding up the control signal A that this said before just needing just every 250.But can not directly take advantage of,, use a d type flip flop here because control signal be not on 250 the some value to be arranged, 4 inputs are arranged, be respectively S, D, C, R, R is a clear terminal, low spot is effectively flat, in case R is 0, output is the non-of S just, D, C are invalid simultaneously, and therefore, A meets R with control signal, and to constant high level of S, like this, as long as one to 250 point, output just is 0; Be not to be to handle like this on 250 the point, D is the data inputs, gives constant high level of D, C is a clock, give the very fast puppet of C one-period sequence immediately, like this, as long as C one saltus step, output is exactly D, D is a high level, and is still constant always, as long as keep high level constant, output is 1 just always, up to the saltus step of 250 points.I am called control signal B with it this signal.This signal all is low level on the integral multiple of 250 points, and other all are high level, will obtain the power cumulative signal like this and multiply by control signal B, more than just realized the function of first module, 250 power adds up.
Equally, use control signal B to realize the function of second module, it does the clock signal of RAM.Simultaneously, cumulative signal power is received the data input pin of RAM, so just can just when being added to 250 points, this power accumulated value be preserved.
Fig. 5 is the noise module circuit diagram, and major function is to convert signal power to noise power, is becoming Gaussian noise, and distributes add-back I/Q two-way.Earlier with integral power divided by 250, obtain average power signal, then, evolution is divided into two-way, multiply by standard noise source, root mean square divided by 2 times of signal to noise ratios, just obtain the noise of I/Q two-way, add back respectively then, obtain weak and have a general TD-SCDMA signal of white Gaussian noise through multipath.
Fig. 6 is the module of software and hardware combining, in ADS software, carry module generated ideal TD-SCDMA signal by multipath channel module and noise module, and through VSA software check errorless after, just insert the 443XB module, the 443XB module is crucial soft or hard binding modules, certainly this is also relevant with the type in employed classical signal source, obstructed signal source type may be used different soft or hard binding modules, in a word, it is carried out reasonable parameter configuration, external hardware signal generator just can discern ADS give with software signal, and operate as normal obtains needed TD-SCDMA radiofrequency signal.
Claims (2)
1. development system based on the TD-SCDMA signal source of ADS, it is characterized in that: described development system comprises ideal signal generation module, noise module and ADS summation module, described ideal signal generation module comprises:
The signal source submodule is used to the device that can generate the TD-SCDMA primary signal that utilizes ADS to carry, and primary signal is uplink and downlink, and up-downgoing TS has synchronous code interval separately; Signal generates submodule, and each the road downstream signal that is used for the signal source submodule is produced is by power splitter and low-converter, and addition respectively more then by upconverter and weak channel, and then obtains baseband signal I/Q two-way by down-conversion; Each road upward signal that the signal source submodule produces directly through weak channel, obtains baseband signal I/Q two-way by down-conversion respectively then, obtains through the weak TD signal of multipath;
In the described noise module, convert signal power to noise power, become Gaussian noise again, and distribute add-back I/Q two-way; Processing procedure is: elder generation divided by 250, obtains average power signal with integral power, and then, evolution is divided into two-way, multiply by standard noise source, divided by
SNR represents signal to noise ratio, just obtains the noise of I/Q two-way, adds back respectively then, obtains weak and have a general TD-SCDMA signal of white Gaussian noise through multipath;
In the ADS summation module, with i/q signal and the noise signal addition that obtains, again the transducer of I/Q two paths of signals by plural number become one tunnel complex signal, obtain the TD-SCDMA baseband signal.
2. the development system of the TD-SCDMA signal source based on ADS as claimed in claim 1, it is characterized in that: generate process multipath TD signal weak and process white Gaussian noise in described noise module in the submodule at described signal, utilize the filter on one 16 rank to carry out matched filtering and connect the Matlab module again, the TD signal data of gathering is reappeared on the Matlab platform, and write the Matlab program data are carried out multi-faceted test: position, numerical value, the average of each time slot power, variance to the up-downgoing synchronous code compare.
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| CN1665177A (en) * | 2005-03-24 | 2005-09-07 | 武汉虹信通信技术有限责任公司 | Signal source of analog SCDMA base station signal |
| CN101056450A (en) * | 2007-05-31 | 2007-10-17 | 武汉虹信通信技术有限责任公司 | Test device and method for implementing the TD-SCDMA RF front-end full duplex |
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| CN1665177A (en) * | 2005-03-24 | 2005-09-07 | 武汉虹信通信技术有限责任公司 | Signal source of analog SCDMA base station signal |
| CN101106787A (en) * | 2006-07-12 | 2008-01-16 | 大唐移动通信设备有限公司 | Base station RF index testing system and method, and RF box for TD-SCDMA system |
| CN101056450A (en) * | 2007-05-31 | 2007-10-17 | 武汉虹信通信技术有限责任公司 | Test device and method for implementing the TD-SCDMA RF front-end full duplex |
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