CN1205584A - CDMA communication apparatus and CDMA communication method - Google Patents
CDMA communication apparatus and CDMA communication method Download PDFInfo
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- CN1205584A CN1205584A CN98106997A CN98106997A CN1205584A CN 1205584 A CN1205584 A CN 1205584A CN 98106997 A CN98106997 A CN 98106997A CN 98106997 A CN98106997 A CN 98106997A CN 1205584 A CN1205584 A CN 1205584A
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Abstract
At base station 101, information signals for mobile station (1) are distributed, each spread with a different spreading code then transmitted from two antennas (3) and (4) assumed under good condition in radio propagation. In mobile station (1), composed waves of both signals are received and each is despread with respective spreading code, as well as in mobile station (2). According to it, it is possible to transmit the same information from a plurality of different antennas at the same time, which prevents the deterioration in communication quality in the case where a wrong antenna is selected or the radio propagation condition varies fast.
Description
The present invention relates to adopt communicator and the communication means of CDMA (code division multiple access).
Fig. 1 has described a kind of CDMA of employing and has been used for carrying out traditional mobile communications device that the base station sends diversity.Among Fig. 1, the base station has four antenna for base station, and simultaneously with the sub-district in three mobile radio stations communicate.In other words, base station 1 has four antennas (1) to (4), 2 to 5 and three mobile radio stations 6 to 8 and base station in the sub-district to communicate.The transmission diversity is carried out by switching four transmitting antennas (1) to (4) in base station 1.
In radio communication, according to mobile radio station or the variation of object on every side, the variation of propagation of wireless signal condition is bigger.If between four antennas (1) to (4) enough spaces are arranged, each propagation conditions of the wireless signal of each in mobile radio station (1) and four antennas (1) to (4) is an independent variation so.In mobile radio station (2) and (3), condition is also adopted in a like fashion.
Hocket in forward link in same radio frequency band in some time interval and the reverse link among the TDD (time division duplex) that communicates by letter, keeping high similitude in the radio propagation conditions, this make can be easily from the propagation state of forward direction link push away the propagation state of reverse link.
Sometime, a certain base station place, with the radio transmission situation of mobile radio station (1) and antenna for base station (1) to (4) relatively after, if learn that the propagation of wireless signal situation that antenna (3) has is best, so just send the information signal of mobile radio station (1) from antenna (3).Similarly, if learn that it is best that mobile radio station (2) is located the propagation of wireless signal situation that antenna (3) has, so just transmit the information signal of mobile radio station (2) from antenna (3), and, if learn that it is best that mobile radio station (3) is located the propagation of wireless signal situation that antenna (2) has, and so just sends the information signal of mobile radio station (3) from antenna (2).
Like this, because the information signal of each mobile radio station is the antenna transmission under the optimum state from radio transmission, so, radio communication quality can be improved, and the quantity of the mobile radio station that can while communicates with the base station can be under the equal in quality level, increased.
Yet, in traditional mobile communications device of carrying out above-mentioned base station transmission diversity, because what select is a base station transmitting antenna, so, if what select is that the variation of wrong transmitting antenna or propagation of wireless signal state is faster than the selection cycle of transmitting antenna, can occur information signal so is not situation about emitting under the good spread state from being in, and can cause degenerating of communication quality like this.And,,, thereby cause the problem of not selecting the antenna under the good propagation state in the transmission so the interference meeting in the signal produces no propagation state between sending and receiving owing to transmit identical spread signal from a plurality of antennas simultaneously.
The purpose of this invention is to provide a kind of good cdma communication device and cdma communication method, to reduce because the degenerating of communication quality when selecting wrong antenna or changes in channel conditions very fast.
Above-mentioned purpose realizes by cdma communication device and cdma communication method, wherein, in a plurality of different extended codes each distributed to each communication line, and the signal expanded with different extended codes of each antenna emission in a plurality of antenna.Adopt this cdma communication device and CDMA antenna method, just reduced owing to selected degenerating of communication quality under wrong antenna or the very fast situation of changes in channel conditions.
Fig. 1 is the illustraton of model that the traditional base station of explanation sends diversity;
Fig. 2 is the illustraton of model that the base station sends diversity in the explanation embodiments of the invention;
Fig. 3 is a block diagram of describing base station transmission apparatus in the embodiments of the invention 1;
Fig. 4 is the frame assumption diagram of transmit frame in embodiments of the invention 1 and 2;
Fig. 5 is a block diagram of describing the structure of mobile radio station receiving system in the embodiments of the invention 2;
Fig. 6 is a structured flowchart of describing base station transmission apparatus in the embodiments of the invention 3;
Fig. 7 is the frame assumption diagram of transmit frame in embodiments of the invention 3 and 4;
Fig. 8 is the signal node composition that sends signal in embodiments of the invention 3 and 4; And
Fig. 9 is a structured flowchart of describing mobile radio station receiving system in the embodiments of the invention 4.
The invention provides a kind of dispensing device, it comprises: a plurality of sending and receiving community antennas; At some line In the road, from the sending and receiving community antenna, select at least two sections that are in the antenna under the good channel conditions Divide; To the different extended code of each bar lane assignment and the letter of expanding each communication line with different extended codes The part of information signal; By switching, will be connected to selected transmission for each spread signal of each circuit With the part that receives on the community antenna; And be coupled to form spread signal with the sending and receiving community antenna Part, wherein, this device connects many circuits with CDMA. As mentioned above, by with a plurality of different expansions Show code is expanded the information of a circuit, so that can be simultaneously from each extend information letter of different antenna transmissions Number.
And, the invention provides a kind of receiving system for CDMA, it comprises: with a plurality of different Extended code is gone the part expanded to received signal; From the signal through going to expand, obtain the synchronous of extended code Part, and form the part of removing spread signal. As mentioned above, can pass through expanding with different extended codes And the information signal of going out from different antenna transmissions simultaneously subsequently go to expand to form original information Signal.
And, the invention provides a kind of dispensing device, it comprises a plurality of transmissions and receives community antenna; In some circuit, select at least two parts that are in the antenna under the good channel conditions the community antenna from sending and receiving; To different extended code of each bar lane assignment and the part of expanding the information signal of each communication line with different extended codes; The part of the pilot signal that extended code that each antenna assignment in some transmission and reception community antenna is different and expansion are corresponding with each antenna; By switching, each spread signal that will be used for each circuit is connected to selected transmission and receives part on the community antenna; And with send and receive the part that community antenna is coupled the spread signal that is used for forming information signal and pilot signal, wherein, this device connects many circuits with CDMA.Like this, can be with the information of a circuit of a plurality of different extended codes expansions, and simultaneously from each spread signal of antenna transmission independently.
Simultaneously, the invention provides the receiving system of a kind of CDMA, it comprises: use the different extended codes of distributing to pilot signal and another different extended codes of distributing to information signal to go the part of expanding to received signal; Obtain the synchronous part of extended code from the spread signal that goes that removes spread signal and information signal of pilot signal; And go spread signal by proofread and correct forming the part of removing spread signal of information signal with pilot signal.As mentioned above, original information signal can be by forming going to expand with different extended codes information signal expansion and that go out from different antenna transmission simultaneously subsequently.
With reference to the accompanying drawings, describe embodiments of the invention in detail.(embodiment 1)
Fig. 2 is the illustraton of model that the explanation base station sends diversity.This figure has described a kind of base station and has had four antennas and two situations that mobile radio station communicates simultaneously in the sub-district, and sends information signal for each mobile radio station with this mobile radio station of two sky alignments.This situation is identical with situation among the following embodiment.
There are four antennas (1) base station 101 to (4), and 102 to 105, promptly 106 and 107 communicate with two mobile radio stations (1) and (2).And the transmission diversity is carried out by switching transmitting antenna (1) to (4) in base station 101.
At a time, after the radio transmission situation with mobile radio station (1) and antenna for base station (1) to (4) compares, if learn with the propagation of wireless signal situation of antenna (3) and (4) quite good, so just from the information signal of antenna (3) and (4) transmission mobile radio stations (1).At this moment, expand with extended code S1 from the information signal that antenna (3) sends, and from the information signal that antenna (4) the sends extended code S2 expansion different with extended code S1.
According to like this, the information signal that sends from antenna (3) is to have the signal that different signal waveforms is arranged with identical information with the information signal that sends from antenna (4).Therefore, if transmit binary signal simultaneously, signal is relevant with delay form in the extended code, but does not influence the decline state from the wireless signal of another antenna.
Similarly, in mobile radio station (2), if learn that the situation of using antenna (2) and (3) to propagate wireless signal is fairly good, then the information signal of mobile radio station (2) sends from antenna (2) and (3).At this moment, expand with extended code S3 from the information signal that antenna (2) sends, and from the information signal that antenna (3) the sends extended code S4 expansion different with extended code S3.
Fig. 3 is the block diagram of the base station transmission apparatus described among Fig. 2.This base station transmission apparatus comprises the processing section of mobile radio station (1) and the processing section of another mobile radio station (2).The processing section of mobile radio station (1) comprises respectively the expansion 201 and 202 and select the selection result of part (1) 204 to switch the conversion portion (1) 203 of spread signal according to antenna that comes spread information signal (1) with different extended code 11 and 12.And the processing section of mobile radio station (2) comprises respectively the expansion 205 and 206 and select the selection result of part (2) 208 to switch the conversion portion (2) 207 of spread signal according to antenna that comes spread information signal (2) with different extended code 21 and 22.And base station transmission apparatus comprises the formation part 209 to 212 that forms by coupling part 203 and 207 signals that transmit.In addition, these formation parts 209 to 212 are coupled with antenna 213 to 216 respectively.
The then explanation operation of the base station transmission apparatus of formation as mentioned above below.Just as described in the text, different extended codes 11,12,21 and 22 are assigned to expansion 201,202,205 and 206 respectively.
The information signal (1) of mobile radio station (1) is assigned to expansion 201 and 202.Expansion 201 usefulness extended codes 11 are come spread information signal (1), to send in the conversion portion 203.Expansion 202 usefulness extended codes 12 are come spread information signal, to send in the conversion portion 203.Antenna selects part 204 to be chosen in two antennas that are in the radio transmission that carries out with mobile radio station (1) under the kilter, and instructs them to arrive conversion portion 203.Conversion portion 203 with expansion 201 and 202 and the formation part 209 to 212 that is coupled according to the antenna of selecting the Instruction Selection of part 204 from antenna in each couple together.Like this, make with the radio transmission of mobile radio station (1) in the antenna that is under the kilter can send two information signals with different extended codes.
As a kind of method of knowing the antenna that is in the radio transmission under the kilter by inference, known a kind of method that adopts incoming level, for example, a kind of method is to select to go the signal expanded to have the antenna of big correlation or big SIR.
Simultaneously, another kind of method is to monitor that correlation and SIR are subsequently from the method for knowing correlation and SIR for information about by inference of previous acquisition.For example, the incoming level of antenna B rises gradually if the incoming level of antenna A descends gradually, establishes next level ratio antenna A big of antenna B, just determines that antenna B is as the antenna that is in radio transmission under the kilter.
The information signal (2) of mobile radio station (2) is assigned to expansion 205 and expansion 206.Expansion 205 usefulness extended codes, 21 spread information signals (2) are to send to conversion portion 207.Expansion 206 usefulness extended codes, 22 spread information signals (2) are to send to conversion portion 207.Antenna selection part 208 is chosen in mobile radio station (2) to be carried out being in the radio transmission two antennas under the kilter and instructs them to arrive conversion portion 207.Conversion portion 207 with signal allocation to formation part 209 to 212 according to the antenna coupling of the Instruction Selection of selecting part 208 from antenna.Like this, learn to be in and carry out the antenna under in shape in the radio transmission with mobile radio station (2) and can send two information signals with different extended code expansions.
According to like this, two antenna transmission of the information signal of each mobile radio station from be in kilter radio transmission under are gone out.Therefore, if chosen wrong antenna, then selected the possibility of antenna of two mistakes less simultaneously according to the information of mistake.This just makes can be chosen at an antenna that is in the radio transmission under the kilter exactly, thereby has improved communication performance.
And if compare with the selection cycle of communication, the variation of the state in the radio transmission is quite fast, and then the spread state of a transmitting antenna may degenerate, but the possibility that has the spread state of two transmitting antennas to degenerate simultaneously is less.This just makes can be chosen in the antenna that is in the radio transmission under the kilter cycle, thereby has improved antenna performance.
And a plurality of information with identical information send out from a plurality of antennas, yet signal wave is mutually different, because the signal of each transmission is to expand with different extended codes.Therefore, these signals are relevant with delay form in the extended code, but do not influence other spread state, the change of spread state during this can not cause receiving and sending.
As mentioned above, in embodiment 1, by allocation information signal, expand each information signal with in a plurality of different extended codes each and send from different antennas then, can improve the communication quality in the radiolink, and increase the moving station number that can communicate with a base station.This has also brought the usury efficient of radio frequency under limited situation.
Simultaneously in the above-described embodiments, the application for the base station has been described, yet this CDMA dispensing device also is applicable to mobile radio station.And, in the above-described embodiments, also illustrated from two situations that antenna is launched under identical level selecting, yet, in the present invention, can from the antenna of two selections with the corresponding varying level of received power and so under launch.(embodiment 2)
The following describes embodiments of the invention 2.What Fig. 4 described is the frame assumption diagram of transmit frame.In a time slot, include pilot frequency code element 301 and information code element 302.The pilot frequency code element of knowing at receiver side 301 is the examination criteria phase place, to know by inference and to compensate phase shift at receiver side.Information code element 302 comprises the information of relevant encoding user speech and the information of relevant circuit control.As information code element, can adopt information code element through error correction coding.
Consider such situation, that is, the base station apparatus from embodiment 1 sends the signal in the above-mentioned frame structure, and receives these signals at the mobile radio station receiving system side joint with structure shown in Figure 5.Fig. 5 has described the situation at two expansions at receiving system place.Receiving system carries out frequency inverted at frequency inverted part 402 places to the signal that receives at antenna 401 places, obtain synchronously with received signal obtaining part 403 places synchronously, go to expansion 404 and 405 places to remove spread signal with extended code, and forming part 406 formation signals.
The following describes operation at the mobile radio station receiving system place of above-mentioned formation.Wireless signal receives and is sent to frequency inverted part 402 at antenna 401 places.The signal frequency that distribution converts from radio frequency is obtained part 403 synchronously and is gone to expansion 404 and 405 to be provided to.Obtaining part 403 synchronously obtains synchronously.Synchronous acquisition is to carry out according to the correlation of going to expand the received signal acquisition.Go expansion 404 and 405 respectively with the extended code 11 and 12 expansion received signal of making a return journey, to obtain desired signal component.In this case, can adopt a kind of in two kinds of extended codes or the two kinds of extended codes.
Because the signal of two antenna transmission is almost received simultaneously from the base station simultaneously, the timing of adopting extended code 11 to obtain almost is identical with the timing of adopting extended code 12 to obtain.Adopt two kinds of timings, can reduce to obtain the time regularly, and obtain regularly exactly.
The timing that obtains is provided to expansion 404 and 405.Go expansion 404 usefulness extended codes 11 to go expansion to received signal, obtain phase-shift phase, and, form in the part 406 to be provided to according to the phase-shift phase of the phase-shift phase compensated information code element that obtains from pilot frequency code element.Go expansion 405 usefulness extended codes 12 to go to expand received signal, obtain phase-shift phase, and, form part 406 to be provided to according to the phase shift of the phase-shift phase compensated information code element that obtains from pilot frequency code element.Form part 406 and be formed on expansion 404 and 405 places and remove the signal expanded, with the redisplaying information signal.
According to like this, can be received in simultaneously and be in the information signal that sends from two base stations under the kilter in the radio transmission.Therefore, if selected an antenna in place, base station mistake, can receive signal so from another antenna transmission owing to mistake.And if compare the radio transmission state variation with the selection cycle of antenna when quite fast, the signal accepting state deterioration from an antenna can receive the better signal from another antenna.This makes can have high-quality communication.
As mentioned above, in embodiment 2, by adopting the extended code of in expansion, using to removing to expand the high usage that can be implemented in radio frequency under the restriction with formation with each expansion in a plurality of extended codes and the allocation information signal of going out from each different antenna transmission subsequently, the communication quality of radiolink is improved, can increase with the mobile radio station quantity that a base station communicates.
Simultaneously, in the above-described embodiments, explanation be the application of mobile radio station, yet this CDMA dispensing device also is applicable to the base station.(embodiment 3)
The following describes embodiments of the invention 3.What Fig. 6 described is the block diagram of base station transmission apparatus among the embodiment 3.Base station transmission apparatus comprises the processing section of handling pilot signal, the processing section of mobile radio station (1) and the processing section of mobile radio station (2).The processing section of handling pilot signal comprises with 01,02,03 and 04 pair of expansion that pilot signal is expanded 501 to 504 of different extended codes.The processing section of mobile radio station (1) comprises expansion of expanding with 11,12,13 and 14 pairs of information signals of different extended codes (1) 505 to 508 and the conversion portion (1) 515 of selecting the selection result switching spread signal of part (1) 513 according to antenna.Equally, the processing section of mobile radio station (2) comprises expansion of expanding with 21,22,23 and 24 pairs of information signals of different extended codes (2) 509 to 512 and the conversion portion (2) 516 of selecting the selection result switching spread signal of part (2) 514 according to antenna.Equally, base station transmission apparatus comprises the formation part 517 to 520 of the later signal that sends of switching that is formed on conversion portion 515 and 516 places.Also comprise respectively formation part 517 to 520 in addition with antenna 521 to 524 couplings.
The then as above operation of the base station transmission apparatus of formation of explanation below.As mentioned above, distribute different extended codes 01 to 04,11 to 14 and 21 to 24 for expansion 501 to 512.
Distribute pilot signal, thereby be provided in the expansion 501 to 504.Expansion 501 usefulness extended codes 01 expansion pilot signal is provided in the formation part 517.Expansion 502 usefulness extended codes 01 expansion pilot signal is provided in the formation part 518.Expansion 503 usefulness extended codes 03 expansion pilot signal is provided in the formation part 519.Expansion 504 usefulness extended codes 04 expansion pilot signal is provided in the formation part 520.
Distribute the information signal (1) of mobile radio station (1), be provided in the expansion 505 to 508.Expansion 505 usefulness extended codes, 11 spread information signals (1) are provided in the conversion portion 515.Expansion 507 usefulness extended codes, 13 spread information signals (1) are provided in the conversion portion 515.Expansion 508 usefulness extended codes, 14 spread information signals (1) are provided in the conversion portion 515.
Be in two antennas under the kilter in the radio transmission that antenna selects part 513 to select to carry out with mobile radio station (1), send instructions to conversion portion 515.According to the instruction of selecting part 513 from antenna, conversion portion 515 is assigned to each with in two spread information signals each and forms part.Similarly, distribute the information signal (2) of mobile radio station (2), be provided in the expansion 509 to 512.In addition, knowing by inference among the method that is in the antenna under the kilter in the radio transmission and the embodiment 1 is identical.
Antenna is selected part 514 to be chosen in mobile radio station (2) to carry out being in the radio transmission two antennas under the kilter, and sends instructions to conversion portion 516.According to the instruction transformation part 516 of selecting part 514 from antenna two different spread information signals are assigned to each and form part 517 to 520.Form part 517 and form the spread signal of pilot signal and the spread signal of information signal, output in the antenna 521.With similar method, form part 518 to 520 and form the spread signal of pilot signal and the spread signal of information signal respectively, output to respectively in the antenna 522 to 524.Antenna 521 to 524 becomes radio frequency with the frequency inverted of the signal of each formation.
According to like this, the information signal of two each mobile radio stations of antenna transmission under radio transmission, being in kilter.Therefore, if selected the situation of the antenna of a mistake in knowing by inference, the possibility that two antennas of selection are made mistakes simultaneously is less.This just feasible antenna that can select exactly to be in the radio transmission under the kilter; Thereby improved communication performance.
Equally, if compare the state variation of radio transmission with the cycle of sky line options quite fast, the spread state of a transmitting antenna can degenerate so, yet the possibility that the spread state of two transmitting antennas degenerates simultaneously is less.This just makes can be chosen in the antenna that is in the radio transmission under the kilter exactly, has improved antenna performance.
Equally, transmit a plurality of information signals with identical information from a plurality of antennas, but signal wave is different mutually, this is because the signal of each transmission is to expand with different extended codes.Therefore, signal have with extended code in the correlation of delay form, but can not influence other spread state, this just makes can not change spread state in receiving and sending.
Equally, adopt common pilot signal for each antenna, can increase a pilot signal number in the frame, this just makes that the reliability of communication is higher.Simultaneously, can also reduce the ratio of pilot signal in the resultant signal, this just makes the ratio of information signal increase.
As mentioned above, in embodiments of the invention 3, pass through allocation information signal, with in a plurality of different extended codes each each information signal is expanded, then send out from different communication, just realized the high usage of radio frequency under limited situation, thereby the communication quality in the radiolink improves, can increase with the moving station number that a base station communicates.
Simultaneously, in the above-described embodiments, explanation be the situation that is applied to the base station, yet this CDMA dispensing device also is applicable to mobile radio station.Equally, in the above-described embodiments, explanation be two situations that antenna sends under identical level from selecting, yet, in the present invention, can from two antennas selecting with the corresponding different capacity level of received power level and so under sending.(embodiment 4)
The following describes embodiments of the invention 4.Fig. 7 is the frame figure of transmit frame structure.The pilot frequency code element of knowing at receiver side is used for detecting a standard phase place, to know and to compensate the phase shift of receiver side by inference.Information code element 602 comprises about the information of encoded voiceband user and the information of relevant circuit control.As information code element, can adopt information code element through error correction coding.In the present embodiment, explanation be the situation that pilot frequency code element 601 and information code element 602 have identical slot length.
Fig. 8 describes is the illustraton of model of the signal that transmits from each antenna.The horizontal line express time.The type of the spread signal that vertical line indicates to form.For antenna 1, in time slot 1, the spread information signal 11 of the spread signal 01 of the antenna 1 that formation will send, mobile radio station (1) and the spread information signal of mobile radio station (2).In time slot 2, the spread information signal 11 of the expansion pilot signal 01 of the antenna 1 that formation will send and mobile radio station (1).For antenna 2, in time slot 1 to 3, the spread information signal 12 of the expansion pilot signal of the antenna 2 that formation will send and mobile radio station (1).For antenna (3), in time slot 1 to 3, the spread information signal 23 of the expansion pilot signal 03 of the antenna that formation will send (3) and mobile radio station (2).For antenna 4, in time slot 1 to 3, only transmit the expansion pilot signal 04 of antenna 4.In time slot 2, the extend information of the expansion pilot signal 04 of the antenna 4 that formation will send and mobile radio station (2).
Consider such situation, that is, the base station transmission apparatus of the signal of Gou Chenging from embodiment 3 sends as mentioned above, and the mobile radio station receiving system place of describing in Fig. 9 subsequently receives.The signal that receives at antenna 801 places is changed at frequency inverted part 802 places, and is provided to synchronization gain part 403 and goes in the expansion 804 to 811.Go 804,806,808 and 810 pairs of pilot signals that warp is synchronous of expansion to go expansion, and the information signal of 805,807,809 and 811 pairs of mobile radio stations of expansion (1) and (2) go expansion.To be provided in the phase compensation part 812 to 815 at the signal that goes to expansion 804 to 811 places to go to expand, with after the signal of phase compensation is provided to form in the part 816 forms.
The following describes the operation at the mobile radio station receiving system place that constitutes as mentioned above.Wireless signal receives at antenna 801 places, is sent to frequency inverted part 802 subsequently.Distribution is provided to synchronization gain part 803 and removes expansion 804 to 811 from the frequency signal that radio frequency converts.Synchronization gain part 803 obtains the synchronous of extended code.This acquisition is to carry out according to going to expand the correlation that received signal obtains.In order to go expansion, can allow to adopt the extended code of extended code, information signal of pilot signal or the two all to adopt.Yet it is dissimilar whether can sending spread information signal from antenna (1).In other words, when from antenna 1 transmission, the correlation that obtains extended code 11 is clearly, and is buried in the noise when not transmitting.Therefore, preferably adopt and be always accurate acquisition synchronously and the extended code 01,02,03 and 04 of the pilot signal that sends.
Because almost receive simultaneously from the signal of four antenna transmission at the place, base station simultaneously, so, the timing that obtains with the extended code 01 of the pilot signal of antenna (1), the timing that obtains with the extended code 02 of the pilot signal of antenna (2), almost be identical with the timing of extended code 03 acquisition of the pilot signal of antenna (3) and with the timing of extended code 04 acquisition of the pilot signal of antenna (4).Adopt this four extended codes, can reduce to obtain the time regularly, and obtain regularly exactly.
The timing that obtains is provided to expansion 804 to 811.Go expansion 804 usefulness extended codes 01 to go expansion to received signal, and, be provided in the phase compensation part 812 from know the phase-shift phase of the information signal that transmits from antenna (1) by inference from the phase-shift phase of the pilot signal of antenna (1).Go expansion 805 usefulness extended codes 11 to go expansion to received signal, and will be provided in the phase compensation part 812 from the information signal that antenna (1) sends.812 compensation of phase compensation part are provided in the formation part 816 from the phase-shift phase of the information signal of antenna (1) transmission.Go expansion 806 usefulness extended codes 02 to go expansion to received signal, and from phase-shift phase, know the phase-shift phase of the information signal that sends from antenna (2) by inference, be provided in the phase compensation part 813 from the pilot signal of antenna (2).Go expansion 807 usefulness extended codes 12 to go to expand received signal, and will be provided in the phase compensation part 813 from the information signal that antenna (2) sends.813 compensation of phase compensation part are provided in the formation part 816 from the phase-shift phase of the information signal of antenna (2) transmission.
Go expansion 808 usefulness extended codes 03 to go expansion to received signal, and know by inference from the phase-shift phase of the information signal of antenna transmission, be provided in the phase compensation part 814 from phase-shift phase from the pilot signal of antenna (3).Go expansion 809 usefulness extended codes 13 to go expansion to received signal, and will be provided in the phase compensation part 814 from the information signal that antenna (3) sends.814 compensation of phase compensation part are provided in the formation part 816 from the phase-shift phase of the information signal of antenna (3) transmission.Go expansion 810 usefulness extended codes 04 to go expansion to received signal, and, be provided in the phase compensation part 815 from know the phase-shift phase of the information signal that sends from antenna (4) by inference from the phase-shift phase of the pilot signal of antenna (4).Go to expand 811 usefulness extended codes 14 and go expansion to received signal, and will be provided in the phase compensation part 815 from the information signal that antenna (4) sends.815 compensation of phase compensation part are provided in the formation part 816 from the phase-shift phase of the information signal of antenna (4) transmission.Forming part 816 forms through going to expand with after the signal of phase compensation, with the redisplaying information signal.
According to like this, can receive the information signal that each antenna in two antennas that are in the radio transmission under the kilter transmits simultaneously.Therefore, if the antenna of having selected a mistake at place, a base station because of the mistake in knowing by inference then can receive the signal from another antenna transmission.This just makes mailing address under good state.
Simultaneously, if the state variation of comparing in the radio transmission with the cycle of sky line options is quite fast, the spread state of a transmitting antenna can degenerate so, yet can be from another antenna receiving signal.This just makes mailing address under good state.
Simultaneously, adopt public pilot signal, can increase a pilot frequency code element number in the frame, make that the reliability of communication is higher for each antenna.Can also reduce the pilot signal ratio in total signal, thereby make the ratio of information signal increase.
As mentioned above, in embodiment 4, by to distributing and expanding and each information signal of going out from each different antenna transmission subsequently goes to expand with in a plurality of different extended codes each, extended code is used for expanding and the formation signal, can be implemented in the high usage of radio frequency under the limited situation, communication quality in the radiolink improves, and can increase with the moving station number that a base station communicates.
Simultaneously, in the above-described embodiments, explanation be the situation that is applied to mobile radio station, yet, also go for the base station.
Also can suitably base station apparatus in the foregoing description and mobile station apparatus be combined, be used for wireless communication system.Simultaneously, in the above-described embodiments, explanation be in converter section office conversion situation with the formation part of antenna coupling, yet conversion portion also can switched antenna.Simultaneously, in the above-described embodiments, explanation be that pilot frequency code element and information code element are included in the situation in the time slot, yet, comprise that at time slot transmitting power control signal for example can carry out under the situation of TPC in an identical manner.
As mentioned above, in cdma mobile communication device of the present invention, employing is used for the extended code expanding and form, by to distribute, expand and each information signal of going out from different antenna transmission subsequently goes to expand with in a plurality of different extended codes each, can be implemented in the high usage of radio frequency under the limited situation, communication quality in the radiolink is improved, can increase with the moving station number that a base station communicates.
Claims (27)
1. cdma communication device is characterized in that it comprises:
Send signal according to each, from a plurality of antennas, select to be in the device of the antenna under the good channel conditions;
Send the expanding unit of signal with a plurality of different extended code expansions; And
From an antenna of selecting, send respectively the dispensing device of the signal of expanding with each extended code in a plurality of different extended codes.
2. cdma communication device as claimed in claim 1 is characterized in that, described choice device is selected the antenna number under the good channel conditions corresponding with the number of extended code.
3. cdma communication device as claimed in claim 1 is characterized in that it also comprises:
When under the situation of a plurality of transmission signals, selecting identical antenna, form the formation device that each expansion sends signal for a plurality of transmission signals.
4. cdma communication device as claimed in claim 3 is characterized in that it also comprises: the device that spread signal is provided to antenna according to the instruction at choice device place.
5. cdma communication device is characterized in that it comprises:
A plurality of antennas, each antenna have the formation device that forms signal;
Expand each expanding unit in a plurality of signals with each different extended code;
Send signal according to each, from described antenna, select to be in the choice device of a plurality of antennas under the good channel conditions; And the conversion equipment that switches and a spread signal is provided to an antenna of selecting.
6. cdma communication device as claimed in claim 5 is characterized in that signal comprises pilot signal and information signal, and described pilot signal is provided in the described formation device after the expansion of expanding unit place under without situation about switching.
7. the base station with cdma communication device is characterized in that, described cdma communication device comprises:
From a plurality of antennas, select to be in the choice device of an antenna under the good channel conditions;
Send the expanding unit of signal with a plurality of different extended code expansions; And
Respectively from the antenna transmission selected dispensing device with the signal of each expansion a plurality of different extended codes.
8. base station as claimed in claim 7 is characterized in that, described choice device selects to be in the antenna number under the good channel conditions corresponding with the extended code number.
9. base station as claimed in claim 7 is characterized in that it also comprises:
When be a plurality of transmission signals when selecting identical antenna under the situation of a plurality of transmission signals, form the formation device that each expansion sends signal.
10. base station as claimed in claim 7 is characterized in that it also comprises:
According to the instruction of selection portion office one spread signal is provided to device in the antenna.
11. a mobile radio station that communicates with the base station with cdma communication device is characterized in that, described cdma communication device comprises:
According to sending signal, from a plurality of antennas, select to be in the choice device of the antenna under the good channel conditions;
Send the expanding unit of signal with a plurality of different extended code expansions; And
The dispensing device of the signal of expanding with a plurality of different extended codes from the antenna transmission selected respectively.
12. mobile radio station as claimed in claim 11 is characterized in that, described choice device selects to be in the antenna number under the good channel conditions corresponding with the expansion yardage.
13. mobile radio station as claimed in claim 11 is characterized in that, described cdma communication device has form the formation device that each expansion sends signal when selecting identical antenna for a plurality of transmission signals under the situation of a plurality of transmission signals.
14. mobile radio station as claimed in claim 13 is characterized in that, the cdma communication device has according to the instruction at choice device place spread signal is provided to device in the antenna.
15. a cdma communication system is characterized in that it comprises:
Base station with a cdma communication device, described base station comprises:
Send signal, choice device that is in the antenna under the good channel conditions of selection from a plurality of antennas according to one;
Send the expanding unit of signal with a plurality of different extended code expansions; And
The dispensing device of the signal of expanding with an extended code a plurality of different extended codes from an antenna transmission of selecting respectively; And
The mobile radio station that communicates with described base station.
16. a cdma communication method, it comprises following step:
According to a transmission signal, from a plurality of antennas, select an antenna that is under the good channel conditions;
Send signal with a plurality of different extended codes expansions one; And
Respectively from an antenna of selecting, send signal with each expansion in a plurality of different extended codes.
17. cdma communication method as claimed in claim 16 is characterized in that, selects to be in the number of the antenna under the good channel conditions corresponding with the number of extended code.
18. cdma communication method as claimed in claim 16 is characterized in that, it also comprises such step, that is, when be a plurality of transmission signals when selecting identical antenna under the situation of a plurality of transmission signals, form each expansion and send signal.
19. cdma communication method as claimed in claim 16 is characterized in that, selects in the received signal at least one in the correlation and SIR greater than corresponding one antenna in the received signal of other antennas from a plurality of antennas.
20. cdma communication method as claimed in claim 19 is characterized in that, knows an antenna that is in the radio transmission in next time slot under the good channel conditions by inference from the last information by at least one acquisition supervision correlation and the SIR.
21. cdma communication method as claimed in claim 19 is characterized in that, the transmission ratio of each antenna is to be provided with corresponding to received power ratio in the antenna of selecting.
22. a cdma communication method is characterized in that, it comprises following step:
Send signal according to each, expand in a plurality of signals each with a different extended code;
From a plurality of antennas, select an antenna that is under the good channel conditions; And
Be that an antenna of selecting switches a spread signal.
23. cdma communication device as claimed in claim 22 is characterized in that signal comprises a pilot signal and information signal, and described pilot signal does not form after the expansion switching.
24. cdma communication device as claimed in claim 22 is characterized in that pilot signal is public definite for each antenna.
25. cdma communication device as claimed in claim 22 is characterized in that, selects in the received signal at least one in the correlation and SIR greater than corresponding one antenna in the received signal of other antennas from a plurality of antennas.
26. cdma communication device as claimed in claim 25 is characterized in that, knows an antenna that is in the radio transmission in next time slot under the good channel conditions by inference from the last information by at least one acquisition supervision correlation and the SIR.
27. cdma communication method as claimed in claim 22 is characterized in that, the transmission ratio of each antenna is to be provided with corresponding to received power ratio in the antenna of selecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98106997A CN1205584A (en) | 1997-05-29 | 1998-04-17 | CDMA communication apparatus and CDMA communication method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP140507/97 | 1997-05-29 | ||
| CN98106997A CN1205584A (en) | 1997-05-29 | 1998-04-17 | CDMA communication apparatus and CDMA communication method |
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| Publication Number | Publication Date |
|---|---|
| CN1205584A true CN1205584A (en) | 1999-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98106997A Pending CN1205584A (en) | 1997-05-29 | 1998-04-17 | CDMA communication apparatus and CDMA communication method |
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| Country | Link |
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| CN (1) | CN1205584A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069537A1 (en) * | 2000-11-24 | 2002-09-06 | Huawei Technologies Co., Ltd. | Method for achieving a large capacity of scdma spread communication system |
-
1998
- 1998-04-17 CN CN98106997A patent/CN1205584A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002069537A1 (en) * | 2000-11-24 | 2002-09-06 | Huawei Technologies Co., Ltd. | Method for achieving a large capacity of scdma spread communication system |
| US6980582B2 (en) | 2000-11-24 | 2005-12-27 | Huawei Technologies Co., Ltd. | Method for achieving a large capacity of SCDMA spread communication system |
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