CN1364009A - Transmitting and zero intermediate frequency receiving method and device in multi-carrier CDMA system based on polyphase decomposition - Google Patents
Transmitting and zero intermediate frequency receiving method and device in multi-carrier CDMA system based on polyphase decomposition Download PDFInfo
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Abstract
The invention discloses a simplified implementing method of transmitting method is DS-CDMA system of multi carriers and receiving method of zero intermediate frequency as well as method of multi phases decomposition. The basic principle is as follows; in the receiving end, radio frequency or high intermediate frequencies of one carrier among multi carriers is zero intermediate frequency; sampling process is carried out by using lowest sampling frequency, and type group of filter replaces the digital filters of multi carrier; with receiving signals of multi carriers being separated and transmitting signals on each carrier being rebuilt, complexity of hardware realization of receiver is reduced by utilizing the implementing structure of simplified receive of multi phases decomposition; in the transmitting end, also modulation group of filter replaces the digital filters of multi carrier; information carried by each carrier is passed through modulation group of filter in parallel and converter ro radio frequency or high intermediate frequencies by utilizing the implementing structure of simplified receiver of multi phases decomposition. In the DS-CDMA system of multi carriers, the invention brings capability of digital process into full play so as to save hardware resources in maximum, make system more economy and reliable.
Description
(1) technical field:
The invention belongs to CDMA (code division multiple access) field of cellular communication systems, relate in particular to based on the multi-carrier CDMA system transmission of heterogeneous decomposition and the method for reseptance and the device of zero intermediate frequency
(2) background technology:
The cdma cellular communication technology is simple with its frequency planning, power system capacity is big, ability of anti-multipath is strong, good communication quality, electromagnetic interference are little etc., and characteristics demonstrate huge development potentiality, are the mainstream technologys that comprises the future mobile communications of the third generation.Wherein, multicarrier DS-CDMA (direct sequence spread spectrum codes is divided multiple access) system has: support high speed data transfer, higher band efficiency, the outstanding advantage that can carry out effective frequency diversity and time diversity and suppress effectively to disturb etc.
Traditional multicarrier DS-CDMA receiver will adopt the high frequency analog matched filter of the high Q value that equates with the carrier wave number, to separate the signal that transmits on the different carrier frequency; Respectively the radiofrequency signal on each carrier wave is down-converted to base band again; Respectively the signal of each carrier wave is sampled at low frequency then.The tricks of the radio frequency analog circuit that such receiver needs equates with the number of carrier wave; And sample rate is minimum to be 2 times of signal bandwidth.The present invention only proposes to simulate receiving circuit downconverts to each carrier signal base band simultaneously from radio frequency or high intermediate frequency (high intermediate frequency is meant that the IF-FRE that is adopted is far above the modulation signal bandwidth) zero intermediate frequency method of reseptance with a cover.The zero intermediate frequency here is meant that the result of down-conversion makes that the centre frequency of the carrier wave in centre of a plurality of carrier waves is a zero frequency.Zero intermediate frequency reciver has following advantage: (1) does not need the high frequency matched filter of high Q value.But in zero intermediate frequency reciver, still use high frequency filter with the requirement of reduction, and prevent the mixing of the harmonic component of radiofrequency signal and local oscillator the down-conversion dynamic range.(2) owing to use zero intermediate frequency to receive, make low pass filter be easy to be integrated into chip internal, and use digital filter, given full play to the advantage of digital processing.(3) because zero intermediate frequency signals is a complex signal, therefore when follow-up digital processing, can reduce requirement most possibly, reduce hard-wired difficulty sample frequency.(4) consider from the angle of software radio, use zero intermediate frequency reciver will make digital processing part and RAKE receiver after A/D samples can be designed to Monolithic Receivers easily, only need a radio frequency handling device and A/D converter device.
(3) summary of the invention:
The objective of the invention is deficiency at existing multicarrier DS-CDMA system's transmission and reception technique, propose a kind ofly can give full play to the digital processing ability, reduce the transmission and the reception technique of the practicality of hardware size most possibly, make that the realization of system is more economical reliable.
The present invention proposes a kind of based on the multicarrier DS-CDMA system transmission of modulation type bank of filters and the simplification implementation method of zero intermediate frequency method of reseptance and heterogeneous decomposition thereof, its technical scheme is: at receiving terminal, multicarrier DS-CDMA received signal is downconverted to base band from radio frequency or high intermediate frequency, so that the centre frequency of the carrier wave in centre of a plurality of carrier waves is a zero frequency, use minimum sample frequency to sample, substitute the multi-carrier digital filter with the modulation type bank of filters, when separating a plurality of carrier wave received signals and rebuilding transmission signal on former each carrier wave, utilize the implementation structure of heterogeneous decomposition simplified receiver, reduce the hardware implementation complexity of receiver.At transmitting terminal, substitute the multi-carrier digital filter with the modulation type bank of filters equally, in the information parallel passes modulation type transmitting filter group that each carrier wave is carried in advance, utilize heterogeneous decomposition to simplify the implementation structure of transmitter, upconvert to high intermediate frequency or radio frequency then simultaneously.
Existing its implement device of accompanying drawings:
Multicarrier DS-CDMA system realizes may further comprise the steps based on the method for reseptance of the transmission of modulation type bank of filters and zero intermediate frequency and the simplification of heterogeneous decomposition thereof: at receiving terminal, multi-carrier signal is direct down-conversion-to base band from radio frequency or high intermediate frequency; Base band multicarrier received signal is sampled; Adopt digital filter to form the modulation type filter bank structure.At transmitting terminal, form modulation type transmitting filter group structure with digital filter; Information parallel passes modulation type transmitting filter group with each carrier wave carries in advance upconverts to radio frequency or high intermediate frequency then simultaneously.Modulation type bank of filters to transmitting-receiving two-end adopts the method for heterogeneous decomposition to simplify realization.Specifically be described respectively.1, based on the transmission of modulation type bank of filters and the method for reseptance of zero intermediate frequency
At receiving terminal, at first the received signal with multicarrier DS-CDMA downconverts to base band from radio frequency or high intermediate frequency, makes the centre frequency of the carrier wave in centre in a plurality of carrier waves be in the zero frequency position, filters out-of-band noise through low pass filter again.
Cdma2000-3x is an example with the configuration of cdma2000 three carrier waves, specifies zero intermediate frequency and receives implementation method.Fig. 1 (a) is the spectrum diagram of receiving terminal three carrier signals.The centre frequency of three carrier waves is respectively f
1, f
2, f
3, they satisfy
f
1+ f
Δ=f
2=f
3-f
Δ[formula 1]
F wherein
Δ=1.23MHz.After down-converted and low-pass filtering, obtain three carrier wave base-band signal spectrums shown in Fig. 1 (b), the centre frequency of its second carrier signal is zero.
The zero intermediate frequency baseband signal of three carrier waves shown in Fig. 1 (b) is carried out the A/D sampling, and the signal after will sampling is sent into the complex coefficient digital filter that equates with the carrier wave number and is handled, to separate the entrained signal of different carrier, resulting receiver is referred to as the multi-carrier receiver structure based on the modulation type bank of filters.
At transmitting terminal, the modulation type transmitting filter group that the information elder generation parallel passes that each carrier wave is carried in advance is made up of the complex coefficient digital filter that equates with the carrier wave number obtains having the baseband signal of the frequency spectrum shown in Fig. 1 (b); And then upconvert to radio frequency or high intermediate frequency simultaneously.Signal after the up-conversion has the frequency spectrum shown in Fig. 1 (a).Resulting like this transmitter is referred to as the multicarrier transmitter structure based on the modulation type bank of filters.
Be configured to example with cdma2000 three carrier waves, as shown in Figure 2 based on the structure of the transmitter of modulation type bank of filters and zero intermediate frequency reciver.If channel is distortion not, then adopt this structure accurately to rebuild transmission signal on former each carrier wave at receiving terminal.
P among Fig. 2
1, p
2, p
3Represent the transmission information on each carrier wave respectively,
Be illustrated respectively in the information on each carrier wave of rebuilding in the receiver.↑ M represents M times of up-sampling, and ↓ M represents M times of down-sampling.In the configuration of cdma2000 three carrier waves, M=4; H
k(z), k=-1, the required digital filter of 0,1 respectively corresponding first, second and third carrier signal; K
0(z) be the low-pass prototype digital filter, its impulse response coefficient is h (n).The impulse response coefficient of each filter is respectively:
Wherein
2, the simplification of receiving terminal modulation type bank of filters realizes
If the exponent number of the low-pass prototype digital filter impulse response h (n) that provides in [formula 3] is that (for the configuration of three carrier waves in the cdma2000, the low-pass prototype digital filter exponent number L value of its transmitting terminal is 48 to L.), its heterogeneous being decomposed into:
Wherein, the q of lowpass prototype filter H (z) heterogeneous element is:
Then the heterogeneous of each filter is decomposed into:
Following formula is expressed as the form of two matrix multiples:
Obtain the simplification implementation structure of the heterogeneous decomposition of multicarrier DS-CDMA system receiving filter group thus, as shown in Figure 3.
Matrix T among Fig. 3 is:
3, the simplification of transmitting terminal modulation type bank of filters realizes
In like manner, can obtain the simplification implementation structure of the heterogeneous decomposition of multicarrier DS-CDMA system transmitting filter group by Fig. 2 and [formula 7], as shown in Figure 4.Matrix T among Fig. 4
HThe conjugate transpose of representing matrix T, concrete value is as follows:
4. computational complexity relatively
Be configured to example explanation the present invention in the advantageous characteristic aspect the reduction implementation complexity with cdma2000 three carrier waves.Handle the criterion of required multiplication accumulative frequency with each input sample as implementation complexity.
With for three carrier receivers,, be 3L then for the required multiplication accumulative frequency of each input sample if adopt structure as shown in Figure 2 to be realized.If adopt heterogeneous decomposition as shown in Figure 4 to simplify the reception structure, then owing to all filtering operations only need to carry out on 1/M sampling speed, and M the heterogeneous element that filter is a lowpass prototype filter, its total length is L.Consider that the operation matrix T shown in [formula 8] need not multiplying, thereby for each sampled input signal, heterogeneous decomposition shown in Figure 4 receives the required multiplication accumulative frequency of structure and is: L multiplication accumulating operation and 12 sub-addition computings.Hence one can see that, can make implementation complexity reduce about 3M=12 doubly on the basis of reception structure shown in Figure 2 based on the receiver structure of heterogeneous decomposition.
Can obtain similar result for transmitting terminal.Adopt its implementation complexity of dispensing device direct implementation more shown in Figure 2 of heterogeneous decomposition can reduce about 3M=12 doubly.
Beneficial effect of the present invention: the present invention is directed to multicarrier DS-CDMA system, propose a kind ofly can give full play to the digital processing ability, save the transmission and the method for reseptance of hardware resource to greatest extent.Its basic characteristics are at the digital processing technology of transmitting terminal and receiving terminal employing modulation type bank of filters, need not a plurality of parallel simulation process devices, thereby make the realization of system reliable more economically.Adopt heterogeneous decomposition that transmitting terminal and the required a plurality of filters of receiving terminal are decomposed and simplification, reduced implementation complexity.The present invention can be used for comprising any multi-carrier mobile communication system of cdma2000-3x.
(4) description of drawings:
Fig. 1 (a) is radio frequency (or the high intermediate frequency) spectrum diagram of three carrier signals, (b) is three carrier wave base band letters
Number spectrum diagram;
Fig. 2 is the structural representation of the modulation type bank of filters of the transmission of three carrier waves and reception;
Fig. 3 is the simplification implementation structure of the heterogeneous decomposition of multicarrier DS-CDMA system receiving filter group;
Fig. 4 is the simplification implementation structure of the heterogeneous decomposition of multicarrier DS-CDMA system transmitting filter group;
Fig. 5 is the multicarrier DS-CDMA system receiving system block diagram based on heterogeneous decomposition;
Fig. 6 is the multicarrier DS-CDMA system transmitter block diagram based on heterogeneous decomposition;
Fig. 7 is based on the multicarrier DS-CDMA system transmitter exemplifying embodiment of heterogeneous decomposition
Fig. 8 is based on frequency receiver exemplifying embodiment in the multicarrier DS-CDMA system zero of heterogeneous decomposition.
(5) embodiment:
Further specify device for carrying out said of the present invention below in conjunction with drawings and Examples
Downsampling device (device 1) to every M input data sampling once, obtains a data output.Up-sampling device (device 2) to each input data sampling once and export this data, and is exported M-1 zero before to next sampling input data more continuously.Filter apparatus (device 3) is a FIR mode filter, and the dependence between the prototype filter h (n) of its impulse response coefficient and system is shown in [formula 5].Matrix operating device (device 4/ device 5) is finished the phase multiplication of two matrixes shown in [formula 7].
Fig. 5 is based on the receiving system block diagram of the multi-carrier CDMA system of heterogeneous decomposition, it by M times of down-sampler device (device 1), filter apparatus (device 3), time-delay mechanism and matrix operating device (device 4) totally four kinds of processing unit form.For M times of down-sampler device (device 1), its input is through the data after the A/D sampling, and to every M input data sampling once, obtains a data output.For filter apparatus (device 3), it carries out filtering to the data from M times of down-sampler device, finishes the FIR filtering shown in [formula 5].For matrix operating device (device 4), its input is exported from the filtering of M filter apparatus, and finishes the matrix operation shown in [formula 7].For the cdma2000-3x system, its operation matrix T is shown in [formula 8].
Fig. 6 is based on the dispensing device block diagram of the multi-carrier CDMA system of heterogeneous decomposition, it by M times of up-sampler device (device 2), filter apparatus (device 3), time-delay mechanism, adder and matrix operating device (device 5) totally five kinds of processing unit form.For matrix operating device (device 5), it be input as the information that each carrier wave carries in advance, and finish the matrix operation shown in [formula 7], for the cdma2000-3x system, its operation matrix is the T shown in [formula 9]
H, the operation result correspondence is sent to M filter apparatus.For filter apparatus (device 3), it finishes the FIR filtering shown in [formula 5] to carrying out filtering from the data of matrix operating device (device 5), and the result is outputed to M times of up-sampler device (device 2).For M times of up-sampler device (device 2), its input is through filtered data, and it to each input data sampling once and export this data and exports M-1 zero more continuously before to next sampling input data.The output of M up-sampler device is respectively through exporting after the time-delay of as shown in figure 10 correspondence and the addition.
Fig. 7 and Fig. 8 are respectively based on the transmission of the multicarrier DS-CDMA system of heterogeneous decomposition and the schematic diagram that the zero intermediate frequency receiving system is implemented in the cdma2000-3x system.The exemplifying embodiment of the dispensing device shown in Figure 11 (a) comprises dispensing device, D/A conversion equipment and the radio frequency handling device of the heterogeneous decomposition of modulation type bank of filters.Wherein radio frequency handling device is finished the upconversion process to the dispensing device output signal of the heterogeneous decomposition of modulation mode filter group, promptly base band D/A output signal is modulated to high intermediate frequency or radio frequency.The exemplifying embodiment of the receiving system shown in Figure 11 (b) comprises radio frequency front-end device, A/D sampling apparatus, the heterogeneous decomposition implement device of modulation type bank of filters and multipath RAKE receiving system.Wherein radio frequency front-end device is finished the radio frequency of reception or the down-converted of high intermediate frequency multi-carrier signal, and the centre frequency that makes mean carrier is a zero frequency, and the baseband signal after the down-converted is carried out low-pass filtering.The A/D sampling apparatus is finished the sampling output to the base band multi-carrier signal, and its sample frequency is 4 * 1.2288Msps, and the implement device of the heterogeneous decomposition of modulation type bank of filters is sent in sampling output with serial mode.The multipath that RAKE receiver is finished single carrier signal merges reception.
Claims (3)
1, based on the multi-carrier CDMA system transmission of heterogeneous decomposition and the method for reseptance of zero intermediate frequency, it is characterized in that: at receiving terminal, multicarrier DS-CDMA received signal is downconverted to base band from radio frequency or high intermediate frequency, so that the centre frequency of the carrier wave in centre of a plurality of carrier waves is a zero frequency, use minimum sample frequency to sample, substitute the multi-carrier digital filter with the modulation type bank of filters, when separating a plurality of carrier wave received signals and rebuilding transmission signal on former each carrier wave, utilize the implementation structure of heterogeneous decomposition simplified receiver, reduce the hardware implementation complexity of receiver, at transmitting terminal, substitute the multi-carrier digital filter with the modulation type bank of filters equally, in the information parallel passes modulation type transmitting filter group that each carrier wave is carried in advance, utilize heterogeneous decomposition to simplify the implementation structure of transmitter, upconvert to high intermediate frequency or radio frequency then simultaneously.
2, require described based on the multi-carrier CDMA system transmission of heterogeneous decomposition and the receiving system of zero intermediate frequency as right 1, it is characterized in that: receiving system is by M times of down-sampler device (device 1), filter apparatus (device 3), time-delay mechanism and matrix operating device (device 4) totally four kinds of processing unit are formed, for M times of down-sampler device (device 1), its input is through the data after the A/D sampling, and once to every M input data sampling, obtain a data output, for filter apparatus (device 3), it carries out filtering to the data from M times of down-sampler device, finish the FIR filtering shown in [formula 5], for matrix operating device (device 4), its input is from the filtering output of M filter apparatus, and finish matrix operation shown in [formula 7], for the cdma2000-3x system, its operation matrix T is shown in [formula 8].
3, require described multi-carrier CDMA system based on heterogeneous decomposition to send receiving system with zero intermediate frequency as right 1, it is characterized in that: dispensing device by M times of up-sampler device (device 2), filter apparatus (device 3), time-delay mechanism, adder and matrix operating device (device 5) totally five kinds of processing unit form, for matrix operating device (device 5), it be input as the information that each carrier wave carries in advance, and finish matrix operation shown in [formula 7], for the cdma2000-3x system, its operation matrix is the T shown in [formula 9]
11The operation result correspondence is sent to M filter apparatus, for filter apparatus (device 3), it is to carrying out filtering from the data of matrix operating device (device 5), finish the FIR filtering shown in [formula 5], and the result outputed to M times of up-sampler device (device 2), for M times of up-sampler device (device 2), its input is through filtered data, it to each input data sampling once and export this data, and export M-1 zero before to next sampling input data more continuously, the output of M up-sampler device is respectively through exporting after the time-delay of as shown in figure 10 correspondence and the addition.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010088809A1 (en) * | 2009-02-04 | 2010-08-12 | 北京天碁科技有限公司 | A multi-carrier separation method and a multi-carrier separation apparatus |
| CN110531137A (en) * | 2018-05-25 | 2019-12-03 | 许继集团有限公司 | A kind of power quality adjusts, voltage transient variation detection method and dynamic electric voltage recovery device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010088809A1 (en) * | 2009-02-04 | 2010-08-12 | 北京天碁科技有限公司 | A multi-carrier separation method and a multi-carrier separation apparatus |
| CN110531137A (en) * | 2018-05-25 | 2019-12-03 | 许继集团有限公司 | A kind of power quality adjusts, voltage transient variation detection method and dynamic electric voltage recovery device |
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