CN102223223B - The method of reseptance and device of multi-carrier signal - Google Patents
The method of reseptance and device of multi-carrier signal Download PDFInfo
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- CN102223223B CN102223223B CN201110174876.4A CN201110174876A CN102223223B CN 102223223 B CN102223223 B CN 102223223B CN 201110174876 A CN201110174876 A CN 201110174876A CN 102223223 B CN102223223 B CN 102223223B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/068—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection by sampling faster than the nominal bit rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Abstract
The invention discloses a kind of method of reseptance of multi-carrier signal and device, this method comprises the following steps：The TD SCDMA multi-carrier signals that receiving terminal after ABB is received, the ADC by sample rate for N times of baseband signal bandwidth, wherein, N is positive integer；The signal for being exported ADC using wave filter carries out carrier wave separation；1 baseband signals as output is extracted from the output per N number of wave filter.By present invention reduces the working frequency of multi-carrier reception and implementation complexity, abbreviation system handling process, the adaptability of system is improved.
Description
Technical field
The present invention relates to the communications field, in particular to the method for reseptance and device of a kind of multi-carrier signal.
Background technology
CDMA (the Time Division-Synchronous Code Division Multiple of time division synchronous
Access, referred to as TD-SCDMA) system and WCDMA (Wideband Code Division Multiple
Access, referred to as WCDMA) and CDMA2000 3G (Third Generation) Moblie standard is adopted as by International Telecommunication Association.At present, TD-
SCDMA industrial chains progressively move to maturity.The network equipment, mobile phone terminal and tester etc. have multiple commercial vendors to provide maturation
Product and solution.Meanwhile TD-SCDMA standards continue evolution, TD-HSDPA is released in 3GPP release 5 without line width
Band downloading service, TD-HSUPA WiMAXs upload business is released in 3GPP release 7.
TD-SCDMA system is based on low bit piece rate (Low Chip Rate, referred to as LCR), i.e. TD-SCDMA signal codes
Piece speed is 1.28MHz, occupied bandwidth 1.6MHz.TD-SCDMA system makes the reality of terminal chip using relatively low spreading rate
Existing complexity reduces, so as to application such as at the advanced signal such as joint-detection (Joint Detection, referred to as JD)
Reason technology, realize higher network capacity.Low bit piece rate technology is realizing voice call, videophone and low-speed wireless online
When have no problem, but on wireless broadband business, there is some inferior positions compared with WCDMA and CDMA2000 because WCDMA and
CDMA2000 provides descending highest 7.2Mb/s peak download rate with 5MHz bandwidth, and TD-SCDMA is carried with 1.6MHz bandwidth
For descending highest 2.8Mb/s peak download rate.It can be seen that although the availability of frequency spectrum is similar, each user can enjoy
The peak download rate difference received is larger.
Experienced to provide the user with WCDMA identicals WiMAX, TD-SCDMA new standards introduce multicarrier skill
Art, i.e. improve transmission rate with multiple carrier wave transmitting data in parallel.Usual carrier number is in TD-SCDMA multicarrier systems
3, transmission and single carrier identical 1.6MHz LCR signals on each carrier wave, i.e. provided up to 4.8MHz bandwidth altogether
8.4Mb/s peak rate.
However, multi-carrier TD-SCDMA technology also proposes while peak rate is improved to terminal radio frequency and baseband chip
Higher requirement.The increase of baseband chip complexity can improve the cost and power consumption of TD-SCDMA multi-carrier terminals.Therefore, it is more
One of key of carrier terminal baseband chip design is how to utilize TD-SCDMA multi-carrier signal features, design performance it is good,
The low scheme of complexity.
In the related art, for realizing that the method for reseptance of multicarrier has only with a set of radio frequency scheme：
Method one：Receiving terminal includes meeting multicarrier frequency and the radio-frequency devices and ABB of bandwidth.Fig. 1 is according to phase
The schematic diagram of the reception device that multicarrier is realized using method one of pass technology, as shown in figure 1, the device includes 8 times of codes
Piece speed (10.24MHz) sampling analog-digital converter (Analog Digital Converter, referred to as ADC) unit, two
Frequency spectrum shift unit (Frequency Transfer, be responsible for respectively moving the carrier wave of the frequency centered on +/- 1.6MHz-
0.8~0.8MHz base band) and the digital lowpass baseband filter of three 1.6MHz bandwidth (be -0.8~0.8MHz base
Band low pass), 8 times of spreading rates or the individually separated base of 4 times of spreading rates, three carrier waves are exported respectively by three low pass filters
Band signal.
Method two：Difference with method one is：1) three wave filters and frequency spectrum shift exchange on signal processing flow
Sequence of positions；2) low pass filter 1 is changed to centre frequency -1.6MHz free transmission ranges -2.4MHz~-0.8MHz band logical filter
Ripple device 1；3) low pass filter 3 is changed to centre frequency+1.6MHz free transmission ranges+0.8MHz~+2.4MHz bandpass filter
3.Specifically, as shown in Fig. 2 Fig. 2 is the schematic diagram according to the reception device that multicarrier is realized using method two of correlation technique.
Method three：It is the equivalent deformation of method two, refers to Fig. 3, Fig. 3 is realized according to the use method three of correlation technique
The schematic diagram of the reception device of multicarrier, i.e. Fast Fourier Transform (FFT) (Fast Fourier are cascaded by wave filter group
Transformation is referred to as FFT) form instead of the functions of three wave filters and frequency spectrum shift module in method two,
Decreased compared with the operand of method two.But FFT is introduced, realize that structure is complex.
It can be seen that in the related art, there is problems with the reception device of multicarrier：
1) higher ADC sampling rates (8 times of code check speed even more highs) are based on, i.e. carrier wave output sampling rate is
The multiple rather than signal bandwidth speed of spreading rate, add cost of implementation and terminal supplying power power consumption.
2) introduce frequency spectrum shift module in method one and method two, the module need by table look-up or other modes complete
High-precision trigonometric function calculates, and operand is big and the memory of occupancy is more.
Although 3) operand of method three has been reduced, the wave filter group being related to especially FFT realize structure all compared with
For complexity.
The content of the invention
It is a primary object of the present invention to provide a kind of reception scheme of multi-carrier signal, at least to solve above-mentioned related skill
The problem of implementation complexity height and big operand of multi-carrier reception in art.
To achieve these goals, according to an aspect of the invention, there is provided a kind of method of reseptance of multi-carrier signal.
According to the method for reseptance of the multi-carrier signal of the present invention, comprise the following steps：By the reception after ABB
The TD-SCDMA multi-carrier signals received are terminated, the ADC by sample rate for N times of baseband signal bandwidth, wherein, N is just whole
Number；The signal for being exported ADC using wave filter carries out carrier wave separation；1 is extracted from the output per N number of wave filter as output
Baseband signals.
Preferably, ADC sample rate is more than the total bandwidth of the carrier waves of TD-SCDMA tri-.
Preferably, the speed of the output data of wave filter is N times of baseband signal bandwidth.
Preferably, in the case where ADC sample rate is 6.4MHz, 1 work is extracted from the output of the wave filter of every 4
For the baseband signals of output.
To achieve these goals, according to another aspect of the present invention, a kind of reception dress of multi-carrier signal is additionally provided
Put.
According to the reception device of the multi-carrier signal of the present invention, including analog-digital converter ADC units and filter cell, its
In, ADC units, for the TD-SCDMA multi-carrier signals for receiving the receiving terminal after ABB, pass through sample rate
For the ADC of N times of baseband signal bandwidth, wherein, N is positive integer；Filter cell, for using wave filter that ADC units is defeated
The signal gone out carries out carrier wave separation, and 1 baseband signals as output is extracted from the output per N number of wave filter.
Preferably, the sample rate for the ADC that ADC units use is more than the total bandwidth of the carrier waves of TD-SCDMA tri-.
Preferably, filter cell includes three the wave filter with a width of 1.6MHz, and respectively a centre frequency is 0
The bandpass filter that low pass filter, a centre frequency are -1.6MHz, the bandpass filtering that a centre frequency is+1.6MHz
Device.
Preferably, the sample rate for the wave filter that the ADC and filter cell that ADC units use are used be 6.4MHz just
Integral multiple.
Preferably, the wave filter in filter cell is 4 times of desampling fir filters.
Preferably, the reception device of above-mentioned multi-carrier signal is mobile terminal.
By the present invention, ADC of the sample rate for N times of baseband signal bandwidth is used, and from per N number of progress carrier wave separation
The mode of 1 baseband signals as output is extracted in the output of wave filter, is realized with TD-SCDMA signal bandwidths speed
The multi-carrier reception of rate-adaptive pacemaker based on rate, solve multi-carrier reception in correlation technique implementation complexity is high and computing
The problem of big is measured, reduce the working frequency and implementation complexity of multi-carrier reception, abbreviation system handling process improves and is
The adaptability of system.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the schematic diagram according to the reception device that multicarrier is realized using method one of correlation technique；
Fig. 2 is the schematic diagram according to the reception device that multicarrier is realized using method two of correlation technique；
Fig. 3 is the schematic diagram according to the reception device that multicarrier is realized using method three of correlation technique；
Fig. 4 is the flow chart of the method for reseptance of multi-carrier signal according to embodiments of the present invention；
Fig. 5 is the structured flowchart of the reception device of multi-carrier signal according to embodiments of the present invention；
Fig. 6 is the structured flowchart of the reception device of multi-carrier signal according to the preferred embodiment of the invention；
Fig. 7 is the structural representation of the realization device of according to embodiments of the present invention one multi-carrier reception；
Fig. 8 is the structural representation of the realization device of according to embodiments of the present invention two multi-carrier reception；
Fig. 9 is the typical multi-carrier power spectrum density of according to embodiments of the present invention three ADC sampling outgoing positions
Schematic diagram；
Figure 10 is the signal of the power spectrum density of according to embodiments of the present invention three outgoing position of bandpass filter 1
Figure；
Figure 11 is the schematic diagram of the power spectrum density of according to embodiments of the present invention three down-sampled outgoing position；
Figure 12 is that according to embodiments of the present invention three output signal of carrier wave 1 and the primary signal local segment of carrier wave 1 contrast
Schematic diagram.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
According to embodiments of the present invention, there is provided a kind of method of reseptance of multi-carrier signal.Fig. 4 is according to embodiments of the present invention
Multi-carrier signal method of reseptance flow chart, as shown in figure 4, this method comprises the following steps：
Step S402, the TD-SCDMA multi-carrier signals that the receiving terminal after ABB is received, passes through sampling
Rate is the ADC of N times of baseband signal bandwidth, wherein, N is positive integer；
Step S404, the signal for being exported ADC using wave filter carry out carrier wave separation；
Step S406,1 baseband signals as output is extracted from the output per N number of wave filter.
By above-mentioned steps, ADC of the sample rate for N times of baseband signal bandwidth is used, and from per N number of progress carrier wave separation
Wave filter output in extract 1 as export baseband signals mode, realize with TD-SCDMA signal bandwidths
The multi-carrier reception of rate-adaptive pacemaker based on speed, solve the implementation complexity height and fortune of the multi-carrier reception in correlation technique
The problem of calculation amount is big, reduce the working frequency and implementation complexity of multi-carrier reception, abbreviation system handling process, improves
The adaptability of system.
It should be noted that in step S402, baseband signal bandwidth refers to TD-SCDMA carrier waves interval, provide in standard
For 1.6MHz, ADC sample rate can be 1.6MHz positive integer times.
Preferably, in step S402, ADC sample rate is more than the total bandwidth of the carrier waves of TD-SCDMA tri-.For example, ADC
Sample rate can be 6.4MHz.This method is advantageous to the accuracy and validity of raising system.
Preferably, in step s 404, the speed of the output data of wave filter is N times of baseband signal bandwidth.This method
It is simple and practical, workable.
Preferably, in the case where ADC sample rate is 6.4MHz, in step S406, from the wave filter of every 4
Output in extract 1 as export baseband signals.This method is realized simple, workable.
Corresponding to the above method, the embodiment of the present invention additionally provides a kind of reception device of multi-carrier signal.Fig. 5 is basis
The structured flowchart of the reception device of the multi-carrier signal of the embodiment of the present invention, as shown in figure 5, the device includes the He of ADC units 52
Filter cell 54, wherein, ADC units 52, for the TD-SCDMA overloadings for receiving the receiving terminal after ABB
Ripple signal, the ADC by sample rate for N times of baseband signal bandwidth, wherein, N is positive integer；Filter cell 54, is coupled to
ADC units 52, the signal for being exported ADC units using wave filter carry out carrier wave separation, and from the output per N number of wave filter
It is middle to extract 1 baseband signals as output.
By the reception device of multi-carrier signal, ADC units 52 use ADC of the sample rate for N times of baseband signal bandwidth,
Filter cell 54 extracts 1 baseband signals as output from the output of the wave filter per N number of progress carrier wave separation
Mode, realize the multi-carrier reception of the rate-adaptive pacemaker based on TD-SCDMA signal bandwidth speed, solve correlation technique
In multi-carrier reception implementation complexity it is high and the problem of operand is big, reduce working frequency and the realization of multi-carrier reception
Complexity, abbreviation system handling process, improve the adaptability of system.
Preferably, the sample rate for the ADC that ADC units 52 use is more than the total bandwidth of the carrier waves of TD-SCDMA tri-.
Fig. 6 is the structured flowchart of the reception device of multi-carrier signal according to the preferred embodiment of the invention, as shown in fig. 6,
Filter cell 54 includes three the wave filter with a width of 1.6MHz, the low pass filter that respectively a centre frequency is 0
542nd, the bandpass filter 544 that a centre frequency is -1.6MHz, the bandpass filter that a centre frequency is+1.6MHz
546。
Preferably, the sample rate for the wave filter that the ADC and filter cell 54 that ADC units 52 use are used is 6.4MHz
Positive integer times.
Preferably, the wave filter in filter cell 54 is 4 times of desampling fir filters.
Preferably, the reception device of above-mentioned multi-carrier signal is mobile terminal.
The implementation process of above-described embodiment is described in detail with reference to preferred embodiments and drawings.
Embodiment one
TD-SCDMA multi-carrier receptions technology based on existing method has higher implementation complexity, and output sampling rate
It is the multiple of spreading rate.Therefore, present embodiments provide a kind of low complex degree and the reception exported with signal bandwidth speed
Method is to overcome above mentioned problem.By lack sampling, (that is, sample frequency is less than the sample frequency of sampling thereom states to the present embodiment.
Sampling thheorem (also known as Nyquist's theorem) regulation：As sample frequency fsMore than highest frequency f in signalmax2 times when, i.e.,：fs
＞=2fmax, then the data signal after sampling intactly remains information in primary signal, typically takes 2.56-4 times of letter
Number peak frequency) working frequency and implementation complexity are reduced, introduce filtering and combine spectrum folding (i.e. spectral aliasing, when to believing
Number carry out lack sampling when, beyond fsThe frequency spectrum of/2 parts can be folded into the normal frequency spectrum within the frequency spectrum after the sampling and region
It is overlapped, causes the region (fs-fmax, fs/ 2) frequency spectrum in produces distortion.The present embodiment suppresses non-branch road using filtering
Subcarrier, recycle lack sampling that the mode that this branch subcarriers are folded into baseband spectrum has been reached to the purpose of frequency spectrum shift, complete
Carrier wave mask work) method, realize the function of frequency spectrum shift module indirectly, be that a kind of low operand, structure are simple and direct
TD-SCDMA multicarrier receiving methods.Also, present embodiments provide the minimum data rate (1.6MHz) for meeting sampling thheorem
Output is beneficial to digital baseband and realizes a whole set of TD-SCDMA bandwidth sample rate receiver schemes, with reach good reception and
More scene adaptability.It can be seen that due to the present embodiment output sample rate be to meet the Least sampling rate of sampling thheorem, and with letter
Number bandwidth is identical larger difference with existing receiver using spreading rate integer sampling by the way of, follow-up channel estimation with
The receiver main modular such as joint-detection is required for carrying out structural modification, and lower signal sampling speed causes overall receiver
Implementation complexity reduce.
Fig. 7 is the structural representation of the realization device of according to embodiments of the present invention one multi-carrier reception, as shown in fig. 7,
ADC sample rate is defined as the integral multiple (integral multiple for being not limited to spreading rate) at carrier wave interval, and more than total band of three carrier waves
Width, the realization device sample rate of minimal complexity is 6.4MHz.After carrier wave separation is realized using wave filter, each again with load
Wave spacing (1.6MHz is determined in existing standard) is that sample rate samples again, because wave filter output data rate is intercarrier
Every integral multiple (4 times), sampling is extracted the down-sampled mode of 1 in being exported by every 4 wave filters and realized again herein.
Wherein, low pass filter 2 is the low pass filter of 1.6MHz bandwidth (- 0.8~0.8MHz)；Frequency centered on bandpass filter 1-
1.6MHz free transmission ranges -2.4MHz~-0.8MHz bandpass filter；Frequency+1.6MHz passbands centered on bandpass filter 3
Scope+0.8MHz~+2.4MHz bandpass filter.
Embodiment two
In embodiment one, due to just remaining 3 being filtered using 1 in 4 times of down-sampled every 4 wave filters outputs of module
Ripple device output drops, wave filter can be merged with 4 times of down-sampled modules to the realization device for obtaining the present embodiment.
Fig. 8 is the structural representation of the realization device of according to embodiments of the present invention two multi-carrier reception, as shown in figure 8,
Every 4 input samples point carries out a wave filter output and calculated, and remaining 3 sampled point calculates without filter output value, with
Carrier wave interval rate exports as sample rate, output result and realizes that function is identical with embodiment one.
Embodiment three
Present embodiments provide a kind of realization device of multi-carrier reception (for example, composition structure similar embodiment one or
Two), its ADC sample rate and bandpass filter 1, low pass filter 2, the sample rate of bandpass filter 3 are defined as
6.4MHz.For example, low pass filter 2 is designed as the radical sign raised cosine filter of 81 ranks；Bandpass filter 1 is low pass filter 2
For coefficient to be generated after -1.6MHz frequency rotatable phases, bandpass filter 3 is that the coefficient of low pass filter 2 is revolved with+1.6MHz frequencies
Phase inversion generates behind position；Wherein, the coefficient of three wave filters can be found in table 1.
The filter coefficient table of table 1
| Coefficient index | Bandpass filter 1 | Low pass filter 2 | Bandpass filter 3 |
| 1 | -0.0045+0.0000i | -0.0045 | -0.0045-0.0000i |
| 2 | 0.0000+0.0005i | -0.0005 | 0.0000-0.0005i |
| 3 | -0.0042+0.0000i | 0.0042 | -0.0042-0.0000i |
| 4 | 0.0000+0.0070i | 0.007 | 0.0000-0.0070i |
| 5 | 0.0063-0.0000i | 0.0063 | 0.0063+0.0000i |
| 6 | -0.0000-0.0020i | 0.002 | -0.0000+0.0020i |
| 7 | 0.0035-0.0000i | -0.0035 | 0.0035+0.0000i |
| 8 | -0.0000-0.0073i | -0.0073 | -0.0000+0.0073i |
| 9 | -0.0071+0.0000i | -0.0071 | -0.0071-0.0000i |
| 10 | 0.0000+0.0027i | -0.0027 | 0.0000-0.0027i |
| 11 | -0.0037+0.0000i | 0.0037 | -0.0037-0.0000i |
| 12 | -0.0000+0.0082i | 0.0082 | -0.0000-0.0082i |
| 13 | 0.0077-0.0000i | 0.0077 | 0.0077+0.0000i |
| 14 | -0.0000-0.0017i | 0.0017 | -0.0000+0.0017i |
| 15 | 0.0067-0.0000i | -0.0067 | 0.0067+0.0000i |
| 16 | 0.0000-0.0127i | -0.0127 | 0.0000+0.0127i |
| 17 | -0.0114+0.0000i | -0.0114 | -0.0114-0.0000i |
| 18 | 0.0000+0.0018i | -0.0018 | 0.0000-0.0018i |
| 19 | -0.0124+0.0000i | 0.0124 | -0.0124-0.0000i |
| 20 | -0.0000+0.0236i | 0.0236 | -0.0000-0.0236i |
| 21 | 0.0240-0.0000i | 0.024 | 0.0240+0.0000i |
| 22 | -0.0000-0.0099i | 0.0099 | -0.0000+0.0099i |
| 23 | 0.0150+0.0000i | -0.015 | 0.0150-0.0000i |
| 24 | 0.0000-0.0396i | -0.0396 | 0.0000+0.0396i |
| 25 | -0.0499+0.0000i | -0.0499 | -0.0499-0.0000i |
| 26 | 0.0000+0.0360i | -0.036 | 0.0000-0.0360i |
| 27 | -0.0020+0.0000i | 0.002 | -0.0020-0.0000i |
| 28 | -0.0000+0.0511i | 0.0511 | -0.0000-0.0511i |
| 29 | 0.0886-0.0000i | 0.0886 | 0.0886+0.0000i |
| 30 | -0.0000-0.0912i | 0.0912 | -0.0000+0.0912i |
| 31 | -0.0467-0.0000i | 0.0467 | -0.0467+0.0000i |
| 32 | 0.0000-0.0374i | -0.0374 | 0.0000+0.0374i |
| 33 | -0.1317+0.0000i | -0.1317 | -0.1317-0.0000i |
| 34 | 0.0000+0.1922i | -0.1922 | 0.0000-0.1922i |
| 35 | 0.1750-0.0000i | -0.175 | 0.1750+0.0000i |
| 36 | 0.0000-0.0541i | -0.0541 | 0.0000+0.0541i |
| 37 | 0.1660-0.0000i | 0.166 | 0.1660+0.0000i |
| 38 | -0.0000-0.4464i | 0.4464 | -0.0000+0.4464i |
| 39 | -0.7230-0.0000i | 0.723 | -0.7230+0.0000i |
| 40 | -0.0000+0.9257i | 0.9257 | -0.0000-0.9257i |
| 41 | 1 | 1 | 1 |
| 42 | 0.0000-0.9257i | 0.9257 | 0.0000+0.9257i |
| 43 | -0.7230+0.0000i | 0.723 | -0.7230-0.0000i |
| 44 | -0.0000+0.4464i | 0.4464 | -0.0000-0.4464i |
| 45 | 0.1660+0.0000i | 0.166 | 0.1660-0.0000i |
| 46 | 0.0000+0.0541i | -0.0541 | 0.0000-0.0541i |
| 47 | 0.1750+0.0000i | -0.175 | 0.1750-0.0000i |
| 48 | -0.0000-0.1922i | -0.1922 | -0.0000+0.1922i |
| 49 | -0.1317-0.0000i | -0.1317 | -0.1317+0.0000i |
| 50 | -0.0000+0.0374i | -0.0374 | -0.0000-0.0374i |
| 51 | -0.0467+0.0000i | 0.0467 | -0.0467-0.0000i |
| 52 | -0.0000+0.0912i | 0.0912 | -0.0000-0.0912i |
| 53 | 0.0886-0.0000i | 0.0886 | 0.0886+0.0000i |
| 54 | -0.0000-0.0511i | 0.0511 | -0.0000+0.0511i |
| 55 | -0.0020-0.0000i | 0.002 | -0.0020+0.0000i |
| 56 | -0.0000-0.0360i | -0.036 | -0.0000+0.0360i |
| 57 | -0.0499-0.0000i | -0.0499 | -0.0499+0.0000i |
| 58 | -0.0000+0.0396i | -0.0396 | -0.0000-0.0396i |
| 59 | 0.0150-0.0000i | -0.015 | 0.0150+0.0000i |
| 60 | -0.0000+0.0099i | 0.0099 | -0.0000-0.0099i |
| 61 | 0.0240+0.0000i | 0.024 | 0.0240-0.0000i |
| 62 | -0.0000-0.0236i | 0.0236 | -0.0000+0.0236i |
| 63 | -0.0124-0.0000i | 0.0124 | -0.0124+0.0000i |
| 64 | -0.0000-0.0018i | -0.0018 | -0.0000+0.0018i |
| 65 | -0.0114-0.0000i | -0.0114 | -0.0114+0.0000i |
| 66 | -0.0000+0.0127i | -0.0127 | -0.0000-0.0127i |
| 67 | 0.0067-0.0000i | -0.0067 | 0.0067+0.0000i |
| 68 | -0.0000+0.0017i | 0.0017 | -0.0000-0.0017i |
| 69 | 0.0077-0.0000i | 0.0077 | 0.0077+0.0000i |
| 70 | -0.0000-0.0082i | 0.0082 | -0.0000+0.0082i |
| 71 | -0.0037-0.0000i | 0.0037 | -0.0037+0.0000i |
| 72 | -0.0000-0.0027i | -0.0027 | -0.0000+0.0027i |
| 73 | -0.0071-0.0000i | -0.0071 | -0.0071+0.0000i |
| 74 | -0.0000+0.0073i | -0.0073 | -0.0000-0.0073i |
| 75 | 0.0035-0.0000i | -0.0035 | 0.0035+0.0000i |
| 76 | -0.0000+0.0020i | 0.002 | -0.0000-0.0020i |
| 77 | 0.0063+0.0000i | 0.0063 | 0.0063-0.0000i |
| 78 | 0.0000-0.0070i | 0.007 | 0.0000+0.0070i |
| 79 | -0.0042-0.0000i | 0.0042 | -0.0042+0.0000i |
| 80 | -0.0000-0.0005i | -0.0005 | -0.0000+0.0005i |
| 81 | -0.0045-0.0000i | -0.0045 | -0.0045+0.0000i |
Fig. 9 is the typical multi-carrier power spectrum density of according to embodiments of the present invention three ADC sampling outgoing positions
Schematic diagram, as shown in figure 9, it is -3.2MHz~+3.2MHz that 6.4MHz, which samples distinguishable signal bandwidth scope, wherein, three loads
Ripple signal is respectively at the position that each 1.6MHz centered on -1.6MHz, 0MHz and+1.6MHz is bandwidth, and three carrier waves are total
Signal bandwidth -2.4MHz~+2.4MHz.
Below by taking the path of carrier wave 1 of multicarrier receiver in embodiment one as an example, the processing procedure of signal is described, other
Two carrier waves are similar to omit description.
Figure 10 is the signal of the power spectrum density of according to embodiments of the present invention three outgoing position of bandpass filter 1
Figure, as shown in Figure 10, other two carrier wave has been effectively suppressed after bandpass filter 1, and only remaining carrier wave 1 is effective
Signal.That is, the output signal of bandpass filter 1 by 4 times it is down-sampled after, frequency spectrum shift is realized in a manner of spectrum folding
Function.
Figure 11 is the schematic diagram of the power spectrum density of according to embodiments of the present invention three down-sampled outgoing position, is such as schemed
Shown in 11, it has been the independent signal of carrier wave 1 to export herein.
Figure 12 is that according to embodiments of the present invention three output signal of carrier wave 1 and the primary signal local segment of carrier wave 1 contrast
Schematic diagram, as shown in figure 12, the output signal of carrier wave 1 and the primary signal of carrier wave 1 overlap, and receiving terminal is almost exactly in unison
Carrier information is recovered.
It can be seen that the carrier wave 1~3 and the original signal waveform of carrier wave 1~3 that the present embodiment device exports are entered by performance simulation
Row contrast, calculation error vector magnitude (Error Vector Magnitude, referred to as EVM), the index on three tunnels is respectively
0.25% (- 52dB), 0.32% (- 50dB) and 0.25% (- 52dB), the quality far above multi-carrier reception to front end signal
It is required that.
In summary, the invention belongs to multi-carrier reception field in communication and information technology, more particularly to a kind of low complexity
Spend the multicarrier receiving method and device of TD-SCDMA terminal users.It can not be directly applied to based on signal bandwidth speed
In the receiver architecture of frequency) present invention reduces working frequency and implementation complexity by lack sampling, and introduce filtering and combine frequency
The method that spectrum folds realizes the function of frequency spectrum shift module indirectly, is that the simple and direct TD-SCDMA of a kind of low operand, structure is more
Carrier wave method of reseptance.And provide and meet that minimum data rate (1.6MHz) output of sampling thheorem is beneficial to digital baseband and realized
The a whole set of non-integral multiple sample rate receiver schemes of TD-SCDMA, to reach good reception and more scene adaptability.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed
Network on, alternatively, they can be realized with the program code that computing device can perform, so as to being stored in
Performed in storage device by computing device, they are either fabricated to each integrated circuit modules respectively or by them
Multiple modules or step be fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of method of reseptance of multi-carrier signal, it is characterised in that comprise the following steps：
The TD-SCDMA multi-carrier signals that receiving terminal after ABB is received, pass through the base band that sample rate is N times
The analog-digital converter ADC of signal bandwidth, wherein, N is positive integer；
The signal for exporting the ADC using wave filter, suppress Fei Benzhi subcarriers by filtering, recycle lack sampling to incite somebody to action this
Branch subcarriers fold into baseband spectrum and carry out carrier wave separation；
1 baseband signals as output is extracted from the output per N number of wave filter.
2. according to the method for claim 1, it is characterised in that the sample rate of the ADC is more than the carrier waves of TD-SCDMA tri-
Total bandwidth.
3. according to the method for claim 1, it is characterised in that the speed of the output data of the wave filter is N times of institute
State baseband signal bandwidth.
4. according to the method in any one of claims 1 to 3, it is characterised in that in the sample rate of the ADC be 6.4MHz
In the case of, 1 baseband signals as output is extracted from the output of the wave filter of every 4.
A kind of 5. reception device of multi-carrier signal, it is characterised in that including analog-digital converter ADC units and filter cell,
Wherein,
The ADC units, for the TD-SCDMA multi-carrier signals for receiving the receiving terminal after ABB, by adopting
Sample rate is the ADC of N times of baseband signal bandwidth, wherein, N is positive integer；
The filter cell, for the signal for the ADC units being exported using wave filter, suppresses non-branch road by filtering
Subcarrier, recycle lack sampling to fold this branch subcarriers into baseband spectrum and carry out carrier wave separation, and from per N number of wave filter
Output in extract 1 as export baseband signals.
6. reception device according to claim 5, it is characterised in that the sample rate for the ADC that the ADC units use
More than the total bandwidth of the carrier waves of TD-SCDMA tri-.
7. reception device according to claim 5, it is characterised in that the filter cell includes three with a width of
1.6MHz wave filter, the band logical that low pass filter that respectively a centre frequency is 0, a centre frequency are -1.6MHz
Wave filter, the bandpass filter that a centre frequency is+1.6MHz.
8. the reception device according to any one of claim 5 to 7, it is characterised in that the ADC units use described
The sample rate for the wave filter that ADC and the filter cell use is 6.4MHz positive integer times.
9. reception device according to claim 8, it is characterised in that the wave filter in the filter cell is 4
Times desampling fir filter.
10. reception device according to claim 5, it is characterised in that the reception device is mobile terminal.
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| CN201110174876.4A CN102223223B (en) | 2011-06-27 | 2011-06-27 | The method of reseptance and device of multi-carrier signal |
| PCT/CN2012/073920 WO2013000317A1 (en) | 2011-06-27 | 2012-04-12 | Multicarrier signal reception method and device |
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| CN201110174876.4A CN102223223B (en) | 2011-06-27 | 2011-06-27 | The method of reseptance and device of multi-carrier signal |
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| CN102223223B (en) * | 2011-06-27 | 2018-02-02 | 深圳市中兴微电子技术有限公司 | The method of reseptance and device of multi-carrier signal |
| US8750174B2 (en) * | 2012-03-30 | 2014-06-10 | Broadcom Corporation | Dual carrier separation |
| CN103236996B (en) * | 2013-02-25 | 2017-08-11 | 深圳创维数字技术有限公司 | A kind of signal processing method and relevant apparatus |
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| CN101657974A (en) * | 2007-04-25 | 2010-02-24 | 马来西亚电信公司 | The front-end transceiver that is used for software radio system |
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| CN1960554A (en) * | 2006-11-17 | 2007-05-09 | 北京天碁科技有限公司 | Device and method capable of detecting and receiving multicarrier jointly |
| CN101370000B (en) * | 2008-10-17 | 2011-06-08 | 北京星河亮点通信软件有限责任公司 | Multi-carrier implementing method and apparatus for TD-SCDMA system |
| CN101814931B (en) * | 2009-02-19 | 2014-07-02 | 中兴通讯股份有限公司 | Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system |
| CN102223223B (en) * | 2011-06-27 | 2018-02-02 | 深圳市中兴微电子技术有限公司 | The method of reseptance and device of multi-carrier signal |
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| 一种TD-SCDMA多载波信号接收滤波的快速方法;汪亮;《通信技术》;20091109;第42卷(第9期);论文第1-2节，图1、2、3 * |
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