CN101505181B - Method for dynamically determining number of cyclic delay samples, antenna allocation method and apparatus - Google Patents
Method for dynamically determining number of cyclic delay samples, antenna allocation method and apparatus Download PDFInfo
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- CN101505181B CN101505181B CN 200810057707 CN200810057707A CN101505181B CN 101505181 B CN101505181 B CN 101505181B CN 200810057707 CN200810057707 CN 200810057707 CN 200810057707 A CN200810057707 A CN 200810057707A CN 101505181 B CN101505181 B CN 101505181B
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Abstract
The invention provides a method for dynamically determining a cyclic delay sample number, an antenna distribution method and an antenna distribution device. The method for determining the cyclic delay sample number comprises the steps of: acquiring the moving speed of a user terminal in a real-time mode; acquiring a sample number of a cyclic prefix of a cyclic delay signal, and taking the sample number as a maximum cyclic delay sample number of a user signal of the user terminal; determining the coherence time of a channel in which the user terminal is positioned according to the moving speed; determining a minimum cyclic delay sample number according to the coherence time; and determining a cyclic delay sample number of the user signal of the user terminal on a cyclic delay diversity transmitting antenna according to the range determined by the maximum cyclic delay sample number and the minimum cyclic delay sample number. The invention avoids the interference among different cyclic delay signals, and ensures that the cyclic delay sample number can be dynamically changed with the moving state of users.
Description
Technical field
The present invention relates to the circulation delay transmit diversity techniques of communication field, particularly relate to a kind of method, antenna assignment method and device of dynamically determining number of cyclic delay samples.
Background technology
The circulation delay transmit diversity techniques refers to utilize the circulation delay emission same signal between the different transmit antennas, obtaining certain emission diversity gain, and adopts the cyclic delay diversity reception technique to reach certain receive diversity gain at receiver side.The at present research work of this technology mainly also rests on the stage of FRPA-Fixed Radiation Pattern Antenna and fixed cycles delay sample, and prior art is mainly the fixed cycles delay diversity technology of transmitter section.In the motion of 3GPP standard, to selecting adaptively circulation delay diversity method to analyse in depth, but prior art does not all provide the method that emitting antenna selecting and circulation delay sample are determined yet yet.
For the user in the movement, different mobile statuss is different to the requirement of number of cyclic delay samples.If number of cyclic delay samples is too many, surpasses receiver time of delay to the response time of same signal with causing, thereby affect the correct reception of receiver; If number of cyclic delay samples is very little, can cause the correlation of signal between different transmit antennas to strengthen, the useful signal of the different delay paths of receiver indistinguishable can not be realized the purpose that transmit diversity and receive diversity gain on the contrary.
Therefore, according to user's mobile status, determine that dynamically a suitable number of cyclic delay samples is very necessary.On the other hand, for multi-user system, if the maximum number of user amount of each transmitting antenna support is changeless, when configurable circulation delay transmitting antenna increases, how carrying out antenna assignment to improve the relatively poor user's of channel quality emission diversity gain, also is problems to be solved.
Summary of the invention
The purpose of this invention is to provide a kind of method, antenna assignment method and device of dynamically determining number of cyclic delay samples, solve the technical problem that prior art can not be determined dynamically according to the state of user terminal the circulation delay sample.
To achieve these goals, the invention provides a kind of method of dynamically determining number of cyclic delay samples, comprising:
Obtain in real time the translational speed of a user terminal;
Obtain the sample number of the Cyclic Prefix of the OFDM circulation delay signal that the cyclic delay diversity transmitting antenna uses, and with the sample number of the described Cyclic Prefix largest loop delay sample number as the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna;
Determine the coherence time of described user terminal place channel according to described translational speed;
Minimal circulation delay sample number according to the subscriber signal of determining described the above user terminal of cyclic delay diversity transmitting antenna described coherence time;
According to described largest loop delay sample number and the determined scope of described minimal circulation delay sample number, determine the number of cyclic delay samples of the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna.
Preferably, above-mentioned method describedly determines that according to described translational speed the step of the coherence time of described user terminal place channel specifically comprises: according to formula T
c=k/f
d, determine described coherence time, wherein T
cBe described coherence time, k is the constant that Doppler's power spectrum is determined, f
dBe Doppler frequency shift, and f
d=v
t/ λ, v
tBe the translational speed of user terminal corresponding to described subscriber signal, λ is carrier wavelength.
Preferably, above-mentioned method, described step according to determining described minimal circulation delay sample number described coherence time specifically comprises: the minimal circulation delay sample number between the described transmitting antenna is described coherence time of T
cMultiply by sample frequency f
s
To achieve these goals, the invention provides a kind of antenna assignment method, comprising: the quantity of determining antenna is the first quantitative value; The quantity of determining user terminal in the described antenna coverage areas is the second quantitative value; Determine the parameter value relevant with channel quality of described user terminal place channel; According to described the first quantitative value, described the second quantitative value and the described parameter value relevant with channel quality, from described antenna, determine configurable antenna, described configurable antenna is as the cyclic delay diversity transmitting antenna; According to the described parameter value relevant with channel quality, from described user terminal, determine to need to adopt the user terminal of cyclic delay diversity; Be at least a described user terminal of employing cyclic delay diversity that needs and distribute the described configurable antenna at least one road.
Preferably, above-mentioned method, the step of described " according to the described parameter value relevant with channel quality, determining to need to adopt the user terminal of cyclic delay diversity from described user terminal " specifically comprises: determine the maximum user terminal number that needs adopt the set of user terminals of cyclic delay diversity to hold; According to the channel quality indication of described user terminal feedback, arrange from low to high active user's terminal by channel quality; Search from low to high described user terminal by channel quality, if the user terminal that finds is in flat fading channel, then this user terminal is added described set, until described set reaches described maximum user terminal number, perhaps until can't find the user terminal that is in flat fading channel; If the user terminal interrupts in the described set connects, then automatically select the next user terminal that is in flat fading channel to join described set.
Preferably, above-mentioned method judges in the following way whether described user terminal is in flat fading channel: if the bandwidth 1/T of subscriber signal corresponding to described user terminal
sGreater than coherence bandwidth f
Tbw, then this user terminal is in flat fading channel.
Preferably, above-mentioned method, in the step of described " be at least a described user terminal of employing cyclic delay diversity that needs and distribute the described configurable antenna at least one road ", also comprise: if described configurable antenna amount increases, then be the poorest user terminal overabsorption one tunnel configurable antenna of channel quality in the described set; If described configurable antenna amount reduces, then distribute less one tunnel configurable antenna for the best user terminal of channel quality in the described set.
To achieve these goals, the present invention also provides a kind of dynamic configuration device of cyclic delay diversity transmitting antenna, comprising: the feedback information detection device is used for from the information of feedback channel acquisition antenna coverage areas user terminal; The antenna assignment subsystem is used for: the quantity of determining antenna is the first quantitative value; The quantity of determining user terminal in the described antenna coverage areas is the second quantitative value; Determine the parameter value relevant with channel quality of described user terminal place channel; According to described the first quantitative value, described the second quantitative value and the described parameter value relevant with channel quality, from described antenna, determine configurable antenna, described configurable antenna is as the cyclic delay diversity transmitting antenna; According to the described parameter value relevant with channel quality, from described user terminal, determine to need to adopt the user terminal of cyclic delay diversity; Be at least a described user terminal of employing cyclic delay diversity that needs and distribute the described configurable antenna at least one road.
Preferably, above-mentioned device, described antenna assignment subsystem comprises: the channel status detection module is used for judging whether active user's terminal is in flat fading channel; The number of users statistical module is for the quantity of determining described antenna coverage areas user terminal; It line options judging module, be used for selecting to determine the allocation plan of transmitting antenna, described allocation plan is specially: according to described the first quantitative value, described the second quantitative value and the described parameter value relevant with channel quality, determine configurable antenna from described antenna; According to the described parameter value relevant with channel quality, from described user terminal, determine to need to adopt the user terminal of cyclic delay diversity; Be at least a described user terminal of employing cyclic delay diversity that needs and distribute the described configurable antenna at least one road; The antenna configuration controller is used for implementing described allocation plan.
Preferably, above-mentioned device also comprises delay sample chooser system, is used for: the translational speed that obtains in real time a user terminal; Obtain the sample number of the Cyclic Prefix of the OFDM circulation delay signal that the cyclic delay diversity transmitting antenna uses, and with the sample number of the described Cyclic Prefix largest loop delay sample number as the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna; Determine the coherence time of described user terminal place channel according to described translational speed; Minimal circulation delay sample number according to the subscriber signal of determining described the above user terminal of cyclic delay diversity transmitting antenna described coherence time; According to described largest loop delay sample number and the determined scope of described minimal circulation delay sample number, determine the number of cyclic delay samples of the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna.
Preferably, above-mentioned device comprises in the described delay sample chooser system: the User Status judging module, be used for the current state of the user terminal that obtains according to described feedback information detection device, and determine the mobile status information of described user terminal; Coherence time, computing module was used for calculating described coherence time according to described mobile status information; The delay sample computing module, be used for according to the sample number of described Cyclic Prefix, described coherence time and current transmitting antenna configuration result, obtain described largest loop delay sample number and described minimal circulation delay sample number, and draw the number of cyclic delay samples of each subscriber signal on described each cyclic delay diversity transmitting antenna.
Technique effect of the present invention is:
1) determines upper lower limit value for the number of cyclic delay samples on every antenna, avoided occuring the interference between the different circulation delay signals of same OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol;
2) determined the lower limit of different number of cyclic delay samples for the user under the different translational speeds, number of cyclic delay samples can dynamically change with user's mobile status;
3) under different main aerial numbers, total number of users, mobile state of terminal and subscriber channel state status, can dynamically allocate for the user of different channels quality limited transmitting antenna resource, and make each user reach best emission diversity gain.
Description of drawings
Fig. 1 is the flow chart of steps of the inventive method embodiment;
Fig. 2 is the structure chart of apparatus of the present invention embodiment;
Fig. 3 is the design sketch of the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with accompanying drawing specific embodiment is described in detail.
Because do not have orthogonality between many antenna circulation delay emissions of same OFDM symbol, therefore easily causing intersymbol interference, more satisfactory mode is exactly the upper lower limit value of determining number of cyclic delay samples.In the embodiment of the invention, number of cyclic delay samples on every transmit antennas adopts following definite method: be limited to the sample number of Cyclic Prefix on the largest loop delay sample number between the transmitting antenna, the minimal circulation delay sample between the transmitting antenna is counted lower limit by decision coherence time of channel.And configurable antenna number of launching for cyclic delay diversity is determined jointly by current main aerial number, total number of users and subscriber channel state, when the circulation delay number of transmit antennas increases, riches all the way penetrates antenna for the relatively poor user's overabsorption of channel quality, when the circulation delay number of transmit antennas reduces, for channel quality preferably the user distribute less that riches all the way penetrates antenna.
The method of dynamically determining number of cyclic delay samples of the embodiment of the invention comprises: the translational speed that obtains in real time a portable terminal; Obtain the sample number of the Cyclic Prefix of the OFDM circulation delay signal that the cyclic delay diversity transmitting antenna uses, and with the sample number of the described Cyclic Prefix largest loop delay sample number as the subscriber signal of described the above portable terminal of cyclic delay diversity transmitting antenna; Determine the coherence time of described portable terminal place channel according to described translational speed; Minimal circulation delay sample number according to the subscriber signal of determining described the above portable terminal of cyclic delay diversity transmitting antenna described coherence time; According to described largest loop delay sample number and the determined scope of described minimal circulation delay sample number, determine the number of cyclic delay samples of the subscriber signal of described the above portable terminal of cyclic delay diversity transmitting antenna.
In order better to explain the implementation procedure of the embodiment of the invention, at first make following variable-definition:
Configurable number of transmit antennas is N
c, the supported maximum number of user of cyclic delay diversity transmitting antenna is N
u, the translational speed of terminal is v
t, the symbol time that transmits is T
s, transmitted bandwidth is f
Tbw, sample frequency is f
s, Doppler frequency shift is f
d, the maximum delay sample number is N
Md, the sample at the protection interval on each transmitting antenna of OFDM symbol is N
GI
The embodiment of the invention is determined the sample number of circulation delay from the coherence time of channel and two aspects, the protection interval of OFDM symbol (sample number of Cyclic Prefix).Be defined as T coherence time
c=k/f
d, f wherein
d=v
t/ λ, λ are carrier wavelength, and k is the constant that Doppler's power spectrum is determined.And if the same difference that transmits postpones the equivalent time T＜T of the maximum delay sample number between the version
c(wherein the equivalent time of each sample is 1/f
s), what it has been generally acknowledged that reception signal experience is slow fading, namely channel response H (t) remained unchanged within this equivalence time; If the same difference that transmits postpones the equivalent time T＞T of the maximum delay sample number between the version
c, what then think reception signal experience is rapid fading, namely change has occured in H (t) within this equivalence time.Because the translational speed of coherence time and terminal is inversely proportional to, when terminal during at high-speed moving state, T
cTherefore be worth littlely, can adopt less number of cyclic delay samples; And as terminal during in mobile status at a slow speed, T
cTherefore be worth greatlyr, can adopt larger number of cyclic delay samples.But the upper limit of number of cyclic delay samples should be the protection interval of OFDM symbol, surpass this upper limit and will cause intersymbol interference, so N
MdSpan be [f
sT
c, N
GI].
If the cyclic delay diversity emission is adopted at alone family, then
1) calculates T coherence time
c
2) determine the span [f of every this user's of antenna number of cyclic delay samples
sT
c, N
GI];
If the multi-user adopts the cyclic delay diversity emission, then
1) calculating T coherence time separately
c
2) determine the span [f of every each user's of antenna number of cyclic delay samples
sT
c, N
GI]
i, i=0 ..., N
u
The method of dynamically determining number of cyclic delay samples of the embodiment of the invention can also combine with the antenna distribution method.The embodiment of the invention determines the dynamic-configuration mode of circulation delay transmitting antenna jointly with current main aerial number, total number of users and channel status.Main aerial number, total number of users and subscriber channel Determines antenna number that can dynamic-configuration.The basic communication that antenna must at first satisfy this community user is normal, and the antenna that therefore is used for the dynamic antenna configuration must be those remaining antennas under the condition that guarantees the proper communication of this community user.It is not good that the cyclic diversity transmitting antenna of capable of dynamic configuration then is used for those communication qualities, needs cyclic delay diversity to assist to improve the user of communication quality.The coherence bandwidth f of communication channel
TbwWith the symbol time T that transmits
sDetermined whether current channel is in smooth or non-flat forms decline state, because cyclic delay diversity is mainly used in flat fading channel, therefore in case the bandwidth 1/T that transmits
s＜f
TbwChannel is in non-flat forms decline state, and this user will not need to adopt the cyclic delay diversity emission, and this means that also this user does not need to adopt extra cyclic delay diversity transmitting antenna.In addition, when the circulation delay number of transmit antennas increased, riches all the way penetrates antenna for the relatively poor user's overabsorption of channel quality, when the circulation delay number of transmit antennas reduces, for channel quality preferably the user distribute less that riches all the way penetrates antenna.
Fig. 1 is the method step flow chart of the embodiment of the invention, and as shown in the figure, the embodiment of the invention comprises the steps:
Step 101 is according to the required basic number of transmit antennas of all user's proper communications of this residential quarter;
Step 102 is determined the antenna number N that capable of dynamic configuration cycles delay diversity is launched
c
Step 103 is determined the supported maximum number of user Nu of current configurable cyclic delay diversity transmitting antenna, comprising:
1) the antenna number N of known capable of dynamic configuration cycles delay diversity emission
c
2) every supported maximum number of user of antenna of definition is N
M
3) setting the minimum spendable circulation delay number of transmit antennas of each user is 2;
4) try to achieve N
u=N
c* N
M/ 2.
Step 104 according to the channel quality indication of feedback, is arranged the active user from low to high by the channel quality quality;
Step 105 is searched the user who is in flat fading channel from low to high by the channel quality quality;
Step 106 judges whether all users are searched complete, is then to return step 101, otherwise execution in step 107;
Step 107 judges that current user is in flat fading channel, is execution in step 108 then, otherwise returns step 105;
Step 108, current user is in flat fading channel, and current user enters the Subscriber Queue that adopts the cyclic delay diversity emission, adds up the current number of users that is in flat fading channel;
Step 109 judges whether the number of users that is in flat fading channel in the Subscriber Queue reaches Nu, is execution in step 111 then, otherwise execution in step 110;
Step 110 judges whether that the user who meets the flat fading conditional request without other exists, and is execution in step 111 then, otherwise execution in step 105;
Step 111 has judged whether that the user interrupts connecting, is that then execution in step 105 is searched the user who is in flat fading channel from low to high by the channel quality quality, and will automatically according to priority selects next qualified user, otherwise execution in step 112;
Step 112 is calculated coherence time; Comprising:
If the cyclic delay diversity emission is adopted at alone family, then
1) calculates T coherence time
c
2) determine the span [f of every this user's of antenna number of cyclic delay samples
sT
c, N
GI];
If the multi-user adopts the cyclic delay diversity emission, then
1) calculating T coherence time separately
c
2) determine the span [f of every each user's of antenna number of cyclic delay samples
sT
c, N
GI]
i, i=0 ..., N
u
Step 113 is determined each user's number of cyclic delay samples further to configure transmitting antenna.Comprising:
According to antenna number N
c, in span [fsTc, NGI] i, select suitable value, further configuration cycles postpones transmitting antenna, comprising:
If Nc increases, then by the mode of step 105, search from low to high the user who is in flat fading channel by the channel quality quality, for being in the lower user's overabsorption of flat fading channel and channel quality one tunnel circulation transmitting antenna.
If Nc reduces, then by the mode of step 105, search from low to high the user who is in flat fading channel by the channel quality quality and distribute less one tunnel circulation transmitting antenna for being in the better user of flat fading channel and channel quality.
Fig. 2 is the structure chart of apparatus of the present invention embodiment, as shown in scheming, mainly comprises two sub-systems, and delay sample chooser system 210 is used for determining the sample span, calculates coherence time and definite each user's number of cyclic delay samples.Antenna assignment subsystem 220 is used for: carry out antenna assignment according to the antenna amount of configurable cyclic delay diversity transmitting antenna and the channel quality of user terminal place channel.
Wherein, feedback information detection device 201 obtains user's current state, the state of channel and current number of users from feedback channel.Channel status detection module 221 judges whether the active user is in flat fading channel, the current number of users of number of users statistical module 222 statistics, comprehensive the above results, determine How to choose and configuration transmitting antenna by sky line options judging module 223, and implemented by antenna configuration controller 224.After User Status judging module 211 obtains user's mobile status information, by coherence time computing module 212 calculate coherence time of active user's channel of living in, delay sample computing module 213 is according to the current number of cyclic delay samples that draws antenna configuration result, Cyclic Prefix and coherence time every final antenna.
Fig. 3 is the relation curve of the number of cyclic delay samples that obtains under different sample frequency conditions and user's translational speed.And corresponding to sample number such as the table 1 at the protection interval of different sample frequencys.As can see from Figure 3, when user moving speed is lower than 20km/h, under the part sample frequency, adopt delay sample number that this method tries to achieve even greater than the length of CP, in the situation that the length of this special desirable CP is as the number of cyclic delay samples of the best.
Table 1
| Sample frequency (MHz) | 1.92 | 3.84 | 7.68 | 15.36 | 23.04 | 30.72 | |
| CP length (Samples) | Short type | 14 | 28 | 56 | 112 | 168 | 224 |
| Elongated | 32 | 64 | 128 | 256 | 384 | 512 |
As from the foregoing, adopt the advantage of the embodiment of the invention to be:
1) determines upper lower limit value for the number of cyclic delay samples on every antenna, avoided occuring the interference between the different circulation delay signals of same OFDM symbol;
2) determined the lower limit of different number of cyclic delay samples for the user under the different translational speeds, number of cyclic delay samples can dynamically change with user's mobile status;
3) under different main aerial numbers, total number of users, mobile state of terminal and subscriber channel state status, can dynamically allocate for the user of different channels quality limited transmitting antenna resource, and make each user reach best emission diversity gain.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. a method of dynamically determining number of cyclic delay samples is characterized in that, comprising:
Obtain in real time the translational speed of a user terminal;
Obtain the sample number of the Cyclic Prefix of the OFDM circulation delay signal that the cyclic delay diversity transmitting antenna uses, and with the sample number of the described Cyclic Prefix largest loop delay sample number as the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna;
Determine the coherence time of described user terminal place channel according to described translational speed;
Minimal circulation delay sample number according to the subscriber signal of determining described the above user terminal of cyclic delay diversity transmitting antenna described coherence time;
According to described largest loop delay sample number and the determined scope of described minimal circulation delay sample number, determine the number of cyclic delay samples of the subscriber signal of described the above user terminal of cyclic delay diversity transmitting antenna;
Wherein, describedly determine that according to described translational speed the step of the coherence time of described user terminal place channel specifically comprises:
According to formula T
c=k/f
d, determine described coherence time, wherein T
cBe described coherence time, k is the constant that Doppler's power spectrum is determined, f
dBe Doppler frequency shift, and f
d=v
t/ λ, v
tBe the translational speed of user terminal corresponding to described subscriber signal, λ is carrier wavelength;
Wherein, described step according to determining described minimal circulation delay sample number described coherence time specifically comprises:
Minimal circulation delay sample number between the described transmitting antenna is described coherence time of T
cMultiply by sample frequency f
s
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| CN1980209A (en) * | 2005-12-05 | 2007-06-13 | 松下电器产业株式会社 | Random-cycle time-delay diversity orthogonal frequency division multiplexing transmission method |
| CN1988408A (en) * | 2006-11-29 | 2007-06-27 | 北京邮电大学 | Antenna circulation delay diversity method for small interval and transmitting and receiving device |
| CN101002448A (en) * | 2004-06-04 | 2007-07-18 | 高通股份有限公司 | Multicarrier modulation system having cyclic delay diversity |
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Patent Citations (4)
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|---|---|---|---|---|
| CN101002448A (en) * | 2004-06-04 | 2007-07-18 | 高通股份有限公司 | Multicarrier modulation system having cyclic delay diversity |
| WO2007052768A1 (en) * | 2005-11-04 | 2007-05-10 | Matsushita Electric Industrial Co., Ltd. | Radio transmitting apparatus, radio receiving apparatus, wireless communication method, and wireless communication system |
| CN1980209A (en) * | 2005-12-05 | 2007-06-13 | 松下电器产业株式会社 | Random-cycle time-delay diversity orthogonal frequency division multiplexing transmission method |
| CN1988408A (en) * | 2006-11-29 | 2007-06-27 | 北京邮电大学 | Antenna circulation delay diversity method for small interval and transmitting and receiving device |
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