CN1917384A - Method and device for receiving data in wireless mobile communication system - Google Patents
Method and device for receiving data in wireless mobile communication system Download PDFInfo
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- CN1917384A CN1917384A CNA2005100904929A CN200510090492A CN1917384A CN 1917384 A CN1917384 A CN 1917384A CN A2005100904929 A CNA2005100904929 A CN A2005100904929A CN 200510090492 A CN200510090492 A CN 200510090492A CN 1917384 A CN1917384 A CN 1917384A
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Abstract
Wherein, when the data of user k is transmitted, the method comprises: making spread spectrum for the message source data of each user; de-blocking the data processed with spread spectrum; taking B number of continuous data as a data block; making time compressing and repeating for each said data block, and the repeat number is R; the said repeated data is sequentially multiplied by a phase sequence exclusively owned by the user; the length of the phase sequence is the product of B and R; the multiplied data is transmitted wirelessly. When the transmitted data is received, the method comprises: separating the multi-path signals transmitted through the radio channel; after separating, the signal in each path is sequentially multiplied by the conjugate sequence of the phase sequence; the product data of each path is respectively multiplied by the spreading code sequence of the user; de-blocking the obtained data; B number of continuous data composes a data block; stacking R data blocks in each path; the G number of data in the data block in each path after stacking is stacked again; making multi-path combination for the data block of each path after stacking; making adjudication for the combined data.
Description
(1) technical field
The present invention relates to a kind of wireless communication technology, more specifically to data receive method in a kind of mobile radio system and receiving equipment.
(2) background technology
Rise along with wireless mobile telecommunication technology and mobile radio system, about improve traffic rate, increase power system capacity, support the technical discussion of faster mobile speed just in the middle of carrying out always, accordingly, the Technological improvement plan of the performance of the interference level in how can the reduction system, the availability of frequency spectrum of optimizing Radio Resource, the opposing wireless channel decline of improvement system etc. is also constantly put forward, and these problems and solution thereof all have confidential relation with the mode that wireless multiple access inserts.
The wireless multiple access access way that direct sequence spread spectrum codes divides multiple access to combine with interlaced FDMA (IFDMA:Interleaved Frequency Division MultipleAccess) has obtained people's attention gradually because of its good anti-multiple access jamming performance (MAI:Multiple AccessInterference).Under such access mode, a user's data at first will multiply each other with a spreading code (Spreading Code) sequence and carry out spread spectrum in the mobile radio system; Data behind described user's spread spectrum can be by a scrambler sequence scrambling, and the employed scrambler sequence in each sub-district is different, thereby makes the described spread spectrum code resources can be multiplexing in each sub-district; Then, the data of described user after by scrambler will be by piecemeal, each described data block and then by time compression and repetition, described data block by time compression with repeat after duration identical with its original duration; Through described time compression and repetitive process, described users'data signals periodically repeats in time-domain, thereby it presents the spectral characteristic of pectination (Comb-shaped) in frequency domain; Because the peculiar multipath transmisstion of wireless channel (Multi-path transmission) characteristic in the wireless mobile communications, wireless signal will produce multipath component after through the wireless channel transmission, and owing to the multipath transmisstion time delay and broadened; For former and later two data blocks that make described user can be because of the mutual interference of multipath broadening phase, to be filled the protection interval with certain-length between former and later two data blocks of described user, described protection length at interval is by the maximum multipath propagation delay decision of wireless channel; At last, the proprietary phase sequence of data block after described user repeated and described user multiplies each other successively, by described multiplication operations, can make the frequency spectrum non-overlapping copies of each described user data signal, disturb thereby guaranteed not produce between the users different in described system multiple access.Divide the detailed description of the wireless multiple access access way that multiple access combines with interlaced FDMA to see also about direct sequence spread spectrum codes: Y.Goto, T.Kawamura, H.Atarashi, M.Sawahashi, " Variable spreading and chip repetition factors (VSCRF)-CDMA in reverse link for broadbandwireless access ", Personal, Indoor and Mobile Radio Communications, 2003 (PIMRC 2003), 14
ThIEEE Proceedings on, vol.1, pp.254 U 259,7-10 Sept.2003.
By the wireless multiple access access way that above-mentioned direct sequence spread spectrum codes divides multiple access to combine with interlaced FDMA, the multiple access interference problem in the mobile radio system between the different user is solved.Yet, also existing a defective under the described wireless multiple access access way: will be filled protection interval between former and later two data blocks of described user with certain-length.Because described protection length at interval is by the maximum multipath propagation delay decision of wireless channel, if there is bigger multipath transmisstion time delay in wireless propagation environment, required described protection length at interval will be longer; And; in third generation wireless mobile communications standard; the working frequency range of system is 2.4GHz; spreading rate behind the spread spectrum can reach 3.84MHz; described wireless multiple access access way certainly will face more abominable multipath transmisstion time delay; thereby may make described protection length at interval become very long; this will cause the traffic rate of mobile radio system to reduce greatly; make the availability of frequency spectrum impaired; simultaneously, described user's data transmitting apparatus also will seriously reduce the transmitted power of data because of a large amount of existence at described protection interval.
The above-mentioned defective that exists in the wireless multiple access access way of dividing multiple access to combine with interlaced FDMA at existing direct sequence spread spectrum codes, a kind of improved wireless multiple access access way is suggested.In the improvement project that is proposed, at first, the wireless multiple access access way of dividing multiple access to combine with interlaced FDMA with existing direct sequence spread spectrum codes is identical, and a user's data will be by spread spectrum, scrambler, piecemeal and time compression and repetition successively in the mobile radio system; Then; the wireless multiple access access way of dividing multiple access to combine with interlaced FDMA with existing direct sequence spread spectrum codes is different; data block after described user repeats will be directly multiplies each other successively with the proprietary phase sequence of described user, and no longer fills protection between former and later two data blocks after described user repeats at interval.
In described improvement project; though the protection between each data block of described user no longer exists at interval; the described data block that same user and different user are adjacent in time will take place overlapped owing to the multipath transmisstion time delay of wireless channel; but those skilled in the art will it be easy to show that the pectination spectral characteristic of the non-overlapping copies between the described different user still keeps; thereby described improvement project still has the advantage of disturbing at the multiple access of eliminating under the wireless channel communication environments between the different user.And crosstalk owing to the overlapped data block that produces for described same user's adjacent data blocks, when the chip duration the multipath transmisstion time delay of wireless channel is being carried out time compression and repeated than described data block after can be compared, need a kind of method that described data are received of design, described data receive method should be able to be apt to add utilization to propagate the multipath data-signal that the back produces through wireless channel, thereby the data-signal that suppresses described user self is crosstalked because of the data block that the multipath transmisstion of wireless channel produces.
(3) summary of the invention
The objective of the invention is to propose data receive method and receiving equipment in a kind of mobile radio system, so that existing direct sequence spread spectrum codes divides the described improvement project of the wireless multiple access access way that multiple access combines with interlaced FDMA not only can be in the abominable wireless propagation environment of multipath transmisstion time delay, the traffic rate of raising system, optimize the availability of frequency spectrum, can also improve simultaneously the communication performance of system, reduce the data sending power of data transmitting equipment.
Above-mentioned goal of the invention is realized by following technical scheme: the data receive method in the mobile radio system, and wherein, a user's information source data comprise that step is as follows in the described system when sending:
A. described user's information source data are carried out spread spectrum, spreading code length is G, G 〉=1;
B. with the deblocking behind the above-mentioned spread spectrum, be a data block with continuous B described data, B be G positive integer doubly;
C. each is above-mentioned data block is carried out time compression and repetition, and number of repetition is R, R 〉=1;
D. the data after the above-mentioned repetition and described user is a proprietary phase sequence multiplies each other successively, and the length of described phase sequence is the product of B and R;
E. the data after above-mentioned the multiplying each other are sent with wireless mode;
After described transmission data are propagated through wireless channel, when being received, it comprises that step is as follows:
F. the multipath data-signal of described transmission data after wireless channel is propagated separated;
G. each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
H. the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively;
I. the deblocking after being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
J. described each footpath every R data block is superposeed;
K. every G data in described each footpath superimposed data piece are superposeed once more;
L. with described each footpath once more the superimposed data piece carry out multipath and merge;
M. the data after described multipath being merged are adjudicated.
According to an aspect of the present invention, in described step a, described user's information source data are the binary bits data, before described Bit data is carried out spread spectrum, earlier described Bit data are carried out chnnel coding and modulation; In described step m, the data after described multipath is merged are carried out demodulation and channel-decoding to it earlier before adjudicating.
According to an aspect of the present invention, in described step l, the mode that described multipath merges is that selecting type merges mode, maximum ratio merges mode or equal gain combining mode, and uses soft decision method in described step m.
According to an aspect of the present invention, in described step b, before to the deblocking behind the described spread spectrum, the data behind the described spread spectrum are carried out scrambler; In described step h, before the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively, product data difference descrambling that earlier will described each footpath.
According to an aspect of the present invention, in described step e, before the data after described the multiplying each other are sent out, the data after described the multiplying each other are carried out pulse shaping; In described step f, before described multipath data-signal is separated, described multipath data-signal is carried out the pulse shaping coupling.
Use the data receiver of described data receive method, comprise as lower device:
A. the device that the multipath data-signal of described transmission data after wireless channel is propagated separated;
B. the device that each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
C. the device that the product data in described each footpath are multiplied each other once more successively with described user's spread spectrum code sequence respectively;
The device of the deblocking after d. being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
E. the device that described each footpath every R data block is superposeed;
F. the device that every G data in described each footpath superimposed data piece are superposeed once more;
G. with described each footpath once more the superimposed data piece carry out the device that multipath merges;
H. the device that the data after described multipath being merged are adjudicated.
(4) description of drawings
Purpose of the present invention and feature will be described in detail in conjunction with the accompanying drawings by embodiment, and these embodiment are illustrative, not have restricted.
Fig. 1 is illustrated in the change procedure of user's data described in the method for the present invention when being sent out.
Fig. 2 is illustrated in the change procedure of transmission data when being received of user described in the method for the present invention.
Fig. 3 represents to use a receiving equipment of method of reseptance of the present invention.
Fig. 4 represents to use the bit error rate performance of method of reseptance of the present invention and existing method of reseptance to compare.
(5) embodiment
The problem that exists in the wireless multiple access access way of dividing multiple access to combine at existing direct sequence spread spectrum codes with interlaced FDMA, for in the abominable wireless propagation environment of multipath transmisstion time delay, the traffic rate of raising system, optimize the availability of frequency spectrum, the method according to this invention, in a mobile radio system, the information source data of a user k will comprise the steps: when sending
A. the information source data of described user k are carried out spread spectrum, spreading code length is G chip, G 〉=1;
B. with the deblocking behind the above-mentioned spread spectrum, be a data block with continuous B described data, B be G positive integer doubly;
C among Fig. 1
K, iRepresent data behind the described spread spectrum, k is described user's a sequence number, i=1, and 2 ..., G ... chip sequence number for data behind the described spread spectrum;
C. each is above-mentioned data block is carried out time compression and repetition, and number of repetition is R, R 〉=1;
D. the data after the above-mentioned repetition and described user is a proprietary phase sequence multiplies each other successively, and the length of described phase sequence is the product of B and R;
E. the data after above-mentioned the multiplying each other are sent with wireless mode;
The change procedure of data when being sent out that has shown described user k among Fig. 1.Wherein, than the wireless multiple access access way that existing direct sequence spread spectrum codes divides multiple access to combine with interlaced FDMA, between described step c and described steps d, saved and between each described data block, inserted protection step at interval.Because the protection between each described data block no longer exists at interval; adjacent in time described data block will take place overlapped owing to the multipath transmisstion time delay of wireless channel; crosstalk in order to suppress the described data block that produces because of the multipath transmisstion of wireless channel; the method according to this invention will comprise that step is as follows when the transmission data of described user k are received:
F. the multipath data-signal of described transmission data after wireless channel is propagated separated, separable multipath is by the propagation model decision of wireless channel;
G. each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
H. the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively;
I. the deblocking after being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
J. described each footpath every R data block is superposeed;
K. every G data in described each footpath superimposed data piece are superposeed once more;
L. with described each footpath once more the superimposed data piece carry out multipath and merge;
M. the data after described multipath being merged are adjudicated.
Shown in described receiving course the change procedure of the footpath of one after described separation data-signal among Fig. 2.
In the method for the invention, the set of described user's spreading code can be used Gold sign indicating number or Walsh code (Walsh Code) set; The value of B depends on the correlation time of wireless channel decline, and the two should mate mutually; The proprietary phase sequence of described user k can adopt following form:
s
k，i＝exp{-j·i·φ
k}，i＝1，2，…，BR (1)
Wherein
Proprietary for described user k, described conjugate sequence is the sequence behind the described phase sequence phase place rotation π.
In addition, in described step a, to described user for before binary bits information source data carry out spread spectrum, also can at first carry out chnnel coding to described Bit data, the mode of chnnel coding can adopt the mode of convolutional encoding or Turbo coding etc.; Then, before the data after the described chnnel coding are carried out spread spectrum, further it is modulated, spendable modulation system has QPSK or qam mode etc.; Accordingly, in described step m, the data after described multipath is merged are carried out demodulation and channel-decoding to it earlier before adjudicating, and the data of the method that can unite soft-decision (Soft Detection) after to described demodulation and channel-decoding are adjudicated; The mode that described multipath merges can be selecting type and merges mode (SelectiveCombination), maximum ratio merging (Maximum Ratio Combination) mode or equal gain combining (Equal GainCombination) mode.In described step b, can be multiplexing in different sub-districts for described spreading code is gathered, still can be before to the deblocking behind the described spread spectrum, data behind the described spread spectrum are carried out scrambler, employed scrambler sequence is generally the Gold sequence, and the scrambler sequence of different districts is the out of phase skew of Gold sequence; Accordingly, in described step h, before the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively, product data difference descrambling that earlier will described each footpath.At last, in the implementation procedure of described mobile radio system, before data after multiplying each other described in the described step e are sent out, also need the data after described the multiplying each other are carried out pulse shaping, pulse shaping filter is generally root raised cosine (Root-raised cosine) Nyquist filter; Accordingly, in described step f, before described multipath data-signal is separated, described multipath data-signal is carried out the pulse shaping coupling.
Further, according to method of reseptance of the present invention, the data receiver of described user k will comprise:
A. the device that the multipath data-signal of described transmission data after wireless channel is propagated separated, it can be made up of a series of delay tap unit of wireless channel propagation model decision;
B. the device that each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
C. the device that the product data in described each footpath are multiplied each other once more successively with described user's spread spectrum code sequence respectively;
The device of the deblocking after d. being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
E. the device that described each footpath every R data block is superposeed;
F. the device that every G data in described each footpath superimposed data piece are superposeed once more;
G. with described each footpath once more the superimposed data piece carry out the device that multipath merges;
H. the device that the data after described multipath being merged are adjudicated.
Provided the schematic diagram of the data receiver that uses the invention described above method execution mode among Fig. 3.
For under the method for the present invention and existing direct sequence spread spectrum codes divide the communication performance of mobile radio system under the wireless multiple access access way that multiple access combines with interlaced FDMA to be compared, can carry out emulation to described the two bit error rate performance.Wherein, existing direct sequence spread spectrum codes divides the method for reseptance under the wireless multiple access access way that multiple access combines with interlaced FDMA to use existing equilibrium to add the traditional approach of despreading, and the protection gap length that inserts between described each data block is 20 chips; Use maximum ratio to merge and the hard decision mode in the method for the present invention; The wireless channel propagation model uses the COST207 ' TU ' channel model that defines in the GSM standard, and wireless channel multipath quantity is 25, and it is known when receiving to establish wireless channel state information; The set of Gold sign indicating number is used in the spreading code set, and spreading code length is 7, and spreading rate is 2.5MHz; Described data block length B is 14, and its number of repetition R is 10; Number of users in the described system is 10, and modulation system adopts QPSK mode, no chnnel coding; The system works frequency range is 2GHz, and Doppler frequency shift DopFre is respectively 0Hz, 1Hz and 2Hz.
Under above-mentioned simulated conditions, the bit error rate performance when using method of reseptance of the present invention and described existing equilibrium to add the method for reseptance of despreading as shown in Figure 4.As can be seen, when DopFre equals 1Hz or 2Hz, the performance of BER of bit error rate (the BER:Bit Error Rate) performance when using method of reseptance of the present invention when using existing equilibrium to add the despreading method of reseptance; Equal 0Hz and work as DopFre, when promptly not having Doppler frequency shift, at bit energy and white Gauss noise power spectral density E
b/ N
0During less than 15dB, the performance of BER that performance of BER might as well be when using existing method of reseptance when using method of reseptance of the present invention; Work as E
b/ N
0After 〉=the 15dB, data block in the described system is crosstalked and will be played a leading role at this moment, thereby the performance of BER when using existing method of reseptance is with the performance of BER that slightly is better than when using receive mode of the present invention, but, performance of BER gain when using existing method of reseptance is as cost with a large amount of system redundancies, for example under this simulated conditions, use the system redundancy when having method of reseptance now to reach
In sum, when the chip duration the multipath transmisstion time delay of wireless channel is being carried out time compression and repeated than described data block after can be compared, use method of reseptance of the present invention and receiving equipment to be apt to add utilization to the multipath data-signal that produces after propagating through wireless channel, merged after the multipath data-signal that produces during wireless channel propagated separates and obtain diversity gain, thereby the data-signal that effectively suppresses described user self is crosstalked because of the data block that the multipath transmisstion of wireless channel produces.Therefore, the wireless multiple access access way of dividing multiple access to combine than existing direct sequence spread spectrum codes with interlaced FDMA, the protection of saving between each data block of described user not only can not cause the communicativeness loss of energy at interval, also can obtain the improvement of communication performance by method of reseptance of the present invention; Simultaneously, equilibrium and despreading mode under the described existing method of reseptance use the computation complexity of the data receiver of method of reseptance of the present invention also can be greatly diminished, thereby have simplified the realization of described data receiver; And in the abominable wireless propagation environment of multipath transmisstion time delay; owing in the process of transmitting of described user data, no longer exist lot of data to send the gap because of described protection insertion at interval; the traffic rate of system and the availability of frequency spectrum can be significantly increased; the data sending power of described data transmitting equipment also can greatly be saved, and makes the power consumption of described data transmitting equipment more economical.
Claims (7)
1. the data receive method in the mobile radio system, wherein, a user's information source data comprise that step is as follows in the described system when sending:
A. described user's information source data are carried out spread spectrum, spreading code length is G, G 〉=1;
B. with the deblocking behind the above-mentioned spread spectrum, be a data block with continuous B described data, B be G positive integer doubly;
C. each is above-mentioned data block is carried out time compression and repetition, and number of repetition is R, R 〉=1;
D. the data after the above-mentioned repetition and described user is a proprietary phase sequence multiplies each other successively, and the length of described phase sequence is the product of B and R;
E. the data after above-mentioned the multiplying each other are sent with wireless mode;
It is characterized in that after described transmission data are propagated through wireless channel, comprising when it is received that step is as follows:
F. the multipath data-signal of described transmission data after wireless channel is propagated separated;
G. each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
H. the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively;
I. the deblocking after being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
J. described each footpath every R data block is superposeed;
K. every G data in described each footpath superimposed data piece are superposeed once more;
L. with described each footpath once more the superimposed data piece carry out multipath and merge;
M. the data after described multipath being merged are adjudicated.
2. the data receive method in the mobile radio system as claimed in claim 1, it is characterized in that in described step a, described user's information source data are the binary bits data, before described Bit data is carried out spread spectrum, earlier described Bit data are carried out chnnel coding and modulation; In described step m, the data after described multipath is merged are carried out demodulation and channel-decoding to it earlier before adjudicating.
3. the data receive method in the mobile radio system as claimed in claim 1 or 2 is characterized in that in described step l, and the mode that described multipath merges is that selecting type merges mode, maximum ratio merges mode or equal gain combining mode.
4. the data receive method in the mobile radio system as claimed in claim 3 is characterized in that using soft decision method in described step m.
5. the data receive method in the mobile radio system as claimed in claim 1 or 2 is characterized in that in described step b, before to the deblocking behind the described spread spectrum, the data behind the described spread spectrum is carried out scrambler; In described step h, before the product data with described each footpath multiply each other once more successively with described user's spread spectrum code sequence respectively, product data difference descrambling that earlier will described each footpath.
6. the data receive method in the mobile radio system as claimed in claim 1 or 2 is characterized in that in described step e, before the data after described the multiplying each other are sent out, the data after described the multiplying each other is carried out pulse shaping; In described step f, before described multipath data-signal is separated, described multipath data-signal is carried out the pulse shaping coupling.
7. use the data receiver of the described data receive method of claim 1, it is characterized in that comprising as lower device:
A. the device that the multipath data-signal of described transmission data after wireless channel is propagated separated;
B. the device that each the footpath data-signal after the described separation is multiplied each other successively with the conjugate sequence of described phase sequence respectively;
C. the device that the product data in described each footpath are multiplied each other once more successively with described user's spread spectrum code sequence respectively;
The device of the deblocking after d. being multiplied each other with spread spectrum code sequence in described each footpath, B described data are a data block continuously;
E. the device that described each footpath every R data block is superposeed;
F. the device that every G data in described each footpath superimposed data piece are superposeed once more;
G. with described each footpath once more the superimposed data piece carry out the device that multipath merges;
H. the device that the data after described multipath being merged are adjudicated.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101809918A (en) * | 2007-09-27 | 2010-08-18 | 爱立信电话股份有限公司 | multiplicative network coding |
| CN101997566A (en) * | 2010-11-08 | 2011-03-30 | 北京理工大学 | Maximum absolute value cumulative mean and grid comparison-based adaptive bit cutting method |
| CN102340325A (en) * | 2011-11-15 | 2012-02-01 | 电子科技大学 | Time-domain capturing method for secondary direct sequence spread spectrum signal |
-
2005
- 2005-08-17 CN CNA2005100904929A patent/CN1917384A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101809918A (en) * | 2007-09-27 | 2010-08-18 | 爱立信电话股份有限公司 | multiplicative network coding |
| CN101809918B (en) * | 2007-09-27 | 2014-03-05 | 爱立信电话股份有限公司 | Multiplicative network coding |
| US8792539B2 (en) | 2007-09-27 | 2014-07-29 | Telefonaktiebolaget L.M. Ericsson (Publ) | Multiplicative network coding |
| CN101997566A (en) * | 2010-11-08 | 2011-03-30 | 北京理工大学 | Maximum absolute value cumulative mean and grid comparison-based adaptive bit cutting method |
| CN101997566B (en) * | 2010-11-08 | 2014-07-09 | 北京理工大学 | Maximum absolute value cumulative mean and grid comparison-based adaptive bit cutting method |
| CN102340325A (en) * | 2011-11-15 | 2012-02-01 | 电子科技大学 | Time-domain capturing method for secondary direct sequence spread spectrum signal |
| CN102340325B (en) * | 2011-11-15 | 2013-09-25 | 电子科技大学 | Time-domain capturing method for secondary direct sequence spread spectrum signal |
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