CN102014401B - Channel estimate method and system in multi-antenna descending system, and base station as well as terminal thereof - Google Patents

Abstract

The present invention discloses a channel estimate method and a system in the multi-antenna descending system, and a base station as well as a terminal thereof. The method comprises the following steps: shifting basic trainning sequence to generate K trainning sequence offsets, selecting K' trainning sequence offsets from K trainning sequence offsets to distribute to the master antennas in M antennas; respectively distributing a trainning sequence offset from the residual trainning sequence offsets to each auxiliary antenna, wherein the number of auxiliary antenna is M-1; to the signal from the master antenna, calculating channel estimate of each user according to the trainning sequence offset corresponding to each user; to the signal from the auxiliary antenna, calculating the total channel estimate value of all users on the auxiliary antenna according to the trainning sequence offset distributed to the auxiliary antenna; obtaining the emission power proportion of each user according to the channel estimate result of each user on master antenna, then calculating the channel estimate of each user on auxiliary antenna according to the emission power proportion and the total channel estimate value of all users on the auxiliary antenna. The present invention has an advantage of increasing the number of users sustained by the system.

Description

Channel estimation methods in many antennas downlink system and system, and base station and terminal

Technical field

The present invention relates to mobile communication technology, relate in particular to channel estimation methods in multi-antenna CDMA access (CDMA) downlink system of a kind of time division multiplexing (TDD) and system, and base station and terminal.

Background technology

In mobile communication system, when transmitting in wireless channel owing to transmitting, will be subject to the impact of wireless channel, therefore, receiving terminal need to be according to the influence degree of wireless channel to transmitting, and recovers and transmit by receiving signal.Wireless channel shows as the channel impulse response (CIR, channel impulse response) of wireless channel to the influence degree that transmits.Because wireless channel exists very large randomness, therefore the variation of CIR be will cause, and amplitude, phase place, the frequency generation distortion of signal caused receiving, therefore, need to the CIR of channel be estimated, correctly recover to transmit by receiving signal with realization.Wherein, the process to the CIR of channel estimates is called channel estimating.

In the code division multiple access of time division multiplexing (TDD) access (CDMA) system, a time slot format of signal frame as shown in Figure 1, data field 1 and data field 2 lay respectively at the both sides of training sequence (Midamble), are protection intervals (GP) at the end of time slot.In some time slot format, also have out of Memory between data field and training sequence, will not enumerate herein.The channel estimating of TDD cdma system is based on training sequence carries out, and according to the CIR of channel estimating, the data symbol of data field 1 and data field 2 is carried out demodulation afterwards.

Due in wireless channel, transmitting not is propagated along single, but can run into various object blocks, arrives receiving terminal through the different paths such as reflection, scattering, refraction and diffraction, becomes the composite signal that arrives by each path.The result of multipath transmisstion causes the same different reflected waves that transmit to arrive the asynchronism(-nization) of receiving terminal (being that time delay is different), and phase place is also different.Usually, system will set its maximum transmitted time delay of supporting, the signal that receives in the corresponding time in the maximum transmitted time delay is considered to the same different reflected waves that transmit, therefore, time corresponding to maximum transmitted time delay can be defined as channel estimation window visually, and each channel estimation window comprises several footpaths.

Communicate simultaneously owing to generally having a plurality of users, therefore the normally stack of a plurality of users' mulitpath of signal that receives of receiving terminal, isolate afterwards the training sequence of stack and the user data part of stack from the signal that receives, utilize isolated overlying training sequence and the local training sequence that produces to carry out channel estimating, according to channel estimation results and local spread spectrum and the scrambler sequence that produces, isolated user data is partly carried out joint-detection, estimate each user's data symbol.

Wherein, when carrying out channel estimating, due to the normally stack of a plurality of users' mulitpath of signal that receives, therefore need to carry out channel estimating to each user.In prior art, in order to improve channel estimating speed, in a single aerial system, usually utilize a basic training sequences to construct each user's training sequence according to certain rule, for example construct each user's training sequence according to the mode of cyclic shift, thereby make the training sequence channel matrix of receiving terminal have circular dependency.Basic training sequences take length as 128 chips is as example, if be offset 8 chips at every turn, can obtain 16 training sequences (abbreviation training sequence deviation) after skew, due to the corresponding user of each training sequence deviation, therefore utilize a single aerial system of this training sequence method of salary distribution can support 16 users.

But for multi-input multi-output system, namely multiaerial system, need to be different training sequence of same user assignment on each antenna, is used for receiving terminal the channel estimating of each user on different antennae calculated.At this moment, if all obtain each user's training sequence according to the mode in a single aerial system on each antenna, the number of users that can support in multiaerial system will reduce along with the increase of antenna number.Take the situation of two antennas as example, it is the training sequence of 128 chips for above-mentioned length, if still be offset 8 chips at every turn, 16 training sequence deviation mean allocation that obtain are on two antennas, it is different training sequence deviation of user assignment on each antenna, the number of users of supporting this moment is 8, has as seen obviously reduced the number of users of supporting.

Summary of the invention

In view of this, provide on the one hand the channel estimation methods in a kind of many antennas downlink system in the present invention, provide on the other hand base station, terminal and channel estimation system in a kind of many antennas downlink system, to improve the supported number of users of multiaerial system.

Channel estimation methods in many antennas downlink system provided by the present invention comprises:

A, being shifted by basic training sequences produces K training sequence deviation, chooses K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, and each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K '+M-1≤K;

B, to the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculate the channel estimating of each user on main antenna; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna;

According to the channel estimation results of each user on main antenna, obtain each user's transmitting power ratio, according to the channel estimating total value of all users on described transmitting power ratio and each auxiliary antenna, calculate the channel estimating of each user on each auxiliary antenna.

Preferably, described

Wherein,

The even number value infimum is got in expression;

Perhaps, described K'=K-M+1.

Preferably, further comprise before steps A: the mapping relations for odd number value each training sequence deviation that obtains and the spread spectrum code resources that is used for the transmission user signal of different K ' are set.

Preferably, described steps A is carried out in the base station, and described step B carries out in terminal;

Before described steps A, further comprise: base station controller indicates the value of M and the value of K ' to the base station;

Before described step B, further comprise: base station controller indicates the value of M and the value of K ' to terminal;

Described base station and described terminal are according to formula

Determine the value of K, wherein,

The even number value supremum is got in expression.

Preferably, a described K' training sequence deviation is: front K' training sequence deviation in K the training sequence deviation that obtains that be shifted in order.

Base station in many antennas downlink system provided by the present invention comprises:

The training sequence distribution module, be used for being shifted by basic training sequences and produce K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K'+M-1≤K;

Signal transmission module, be used for the allocation result according to described training sequence distribution module, send a signal to terminal on a described M antenna, be used for terminal to the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculate the channel estimating of each user on main antenna; Channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, to the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

Preferably, this base station further comprises: information receiving module, be used for to receive the indication information from the value of the value that comprises M of base station controller and K', and the value of described M and the value of K' are offered described training sequence distribution module.

Preferably, described Wherein, The even number value infimum is got in expression;

Perhaps, described K'=K-M+1.

Terminal in many antennas downlink system provided by the present invention comprises:

The main antenna channel estimation module is used for the signal from main antenna, according to the training sequence deviation corresponding with each user, calculates the channel estimating of each user on main antenna;

Auxiliary antenna channel estimation module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna;

Described from main antenna signal and produced according to following method by the base station from the signal of each auxiliary antenna: being shifted by basic training sequences produces K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K '+M-1≤K.

Preferably, described auxiliary antenna channel estimation module comprises:

The power proportions calculating sub module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio;

Channel estimating total value calculating sub module is used for the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculates the channel estimating total value of all users on this auxiliary antenna;

The channel estimation calculation submodule, be used for the channel estimating total value of all users on each user's of obtaining according to described power proportions calculating sub module transmitting power ratio and each auxiliary antenna that described channel estimating total value calculating sub module is calculated, calculate the channel estimating of each user on each auxiliary antenna.

Channel estimation system in many antennas downlink system provided by the present invention comprises:

The base station, be used for being shifted by basic training sequences and produce K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of the individual user of K ' on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K'+M-1≤K;

Terminal is used for the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculates the channel estimating of each user on main antenna; Channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, to the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

can find out from such scheme, produce K training sequence deviation by a basic training sequences cyclic shift in the present invention, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation, respectively distribute a training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna from remaining training sequence deviation, K' user on every auxiliary antenna shares a training sequence deviation, and pass through the signal from main antenna, according to the channel estimation methods in a single aerial system of the prior art, the i.e. training sequence deviation corresponding with each user in training sequence deviation individual according to K ' calculated the channel estimating of each user on main antenna, to the signal from each auxiliary antenna, consider when signal sends, when especially downstream signal sends, the channel conditions that each subscriber signal experiences is identical and can there be different characteristics in transmitting power, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, channel estimating total value according to all users on described transmitting power ratio and each auxiliary antenna, calculate the channel estimating of each user on each auxiliary antenna, the user data that namely can support in this scheme is the user data that can support on main antenna, be K' user, due to K' 〉=K/M, therefore improved the user data that multiaerial system can be supported.

Description of drawings

Fig. 1 is a time slot format schematic diagram of signal frame in prior art;

Fig. 2 is the exemplary process diagram of the channel estimation methods in multiaerial system in the embodiment of the present invention;

The value that Fig. 3 a to Fig. 3 g is respectively K' in the embodiment of the present invention is the mapping relations schematic diagram of 15,13,11,9,7,5,3 o'clock;

Fig. 4 is the exemplary block diagram of the channel estimation system in multiaerial system in the embodiment of the present invention;

Fig. 5 is the internal structure schematic diagram of base station in the embodiment of the present invention;

Fig. 6 is the internal structure schematic diagram of terminal in the embodiment of the present invention;

Fig. 7 is the internal structure schematic diagram of auxiliary antenna channel estimation module in terminal shown in Figure 6.

Embodiment

In the present invention, consider when signal sends, when especially downstream signal sends, the channel conditions that each subscriber signal experiences is identical and can there be different characteristics in transmitting power, therefore can utilize an antenna in a plurality of antennas as main antenna, for this main antenna distributes a plurality of training sequence deviation, to support more user, other antenna is training sequence deviation of each auxiliary antenna assignment as auxiliary antenna; Afterwards, to the signal from main antenna, according to the channel estimation methods in a single aerial system of the prior art, calculate the channel estimating of each user on main antenna; To the signal from each auxiliary antenna, first according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, because the transmitting power ratio of user on each antenna is all identical, therefore can be according to the channel estimation results of each user on main antenna, obtain each user's transmitting power ratio, and according to the channel estimating total value of all users on this transmitting power ratio and each auxiliary antenna, calculate the channel estimating of each user on each auxiliary antenna.

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.

Fig. 2 is the exemplary process diagram of the channel estimation methods in multiaerial system in the embodiment of the present invention.In the present embodiment, this signal of hypothesis sends and uses M antenna, and with an antenna in M antenna as main antenna, other M-1 antenna is as auxiliary antenna, and the hypothesis basic training sequences is according to rear total K the training sequence deviation of predetermined shift intervals displacement, as shown in Figure 2, this flow process comprises the steps:

Step 201, produce K training sequence deviation from a basic training sequences cyclic shift, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna.Wherein, K, M and K' are the integer greater than 0, and K'+M-1≤K.

In this step, can determine that the CIR window is long according to the number of users K' on antenna number M and M antenna; Long according to described window, basic training sequences is shifted, obtain K training sequence deviation, K=K'+M-1.

Step 202 to the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, is calculated the channel estimating of each user on main antenna; Channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, to the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

Step 201 in the present embodiment can be carried out in the base station, afterwards, the base station can be according to the allocation result of above-mentioned training sequence deviation, transmitted signal on M antenna, wherein, on main antenna, each user uses different training sequence deviation, and each user uses identical training sequence deviation in auxiliary antenna.

Wherein, as main antenna, other M-1 antenna can have multiple as the mode of auxiliary antenna with an antenna in M antenna, and can be an in advance static antenna that arranges in M antenna is main antenna, and other antenna is auxiliary antenna; Can be also main antenna according to predetermined period or an antenna pre-conditioned or that the mode such as choose at random arranges in M antenna dynamically, other antenna be auxiliary antenna; Perhaps can also be according to the alternate manner setting.

Choosing K' training sequence deviation from K training sequence deviation distributes to the mode of the main antenna of setting in M antenna and can have following two schemes at least:

Scheme one:

According to acquiescence training sequence allocative decision of the prior art as can be known, a kind of value sequence of K is 16,14,12,10,8,6,4,2.In this programme, if still choose the value of K ' according to this value sequence, owing to there being M-1 training sequence deviation need to distribute to auxiliary antenna in K training sequence deviation, therefore the training sequence deviation quantity K' on main antenna must choose from the even number value less than K, and the value of the K' under different K and M value condition in the present embodiment scheme one has been shown in table 1.

Table 1

As can be seen from Table 1, be the situation of even number for the M value, K-K'〉M-1, the mode of therefore choosing M-1 training sequence deviation from a remaining K-K' training sequence deviation can have multiple; Be the situation of odd number for the M value, K-K'=M-1 therefore can be directly individual with remaining K-K ', and namely M-1 training sequence deviation distributed to auxiliary antenna.

As seen, in this programme,

Wherein,

The even number value infimum is got in expression.

In this programme, preferably, K' training sequence deviation can be front K' training sequence deviation in being shifted in order K the training sequence deviation that obtains.

In prior art, can resolve the signal from transmitting terminal in order to make receiving terminal, can preset the training sequence deviation of acquiescence and the mapping relations of spread spectrum code resources, receiving terminal can according to the spread spectrum code resources of these mapping relations and transmission user signal, find the training sequence corresponding with each user.Value due to K' in this programme is the value sequence { 16 of K in prior art, 14,12,10,8,6,4, value in 2}, if K' training sequence deviation is front K' training sequence deviation in being shifted in order K the training sequence deviation that obtains, each training sequence deviation that obtains for the value of different K' and the mapping relations of spread spectrum code resources can adopt the mapping relations of giving tacit consent in prior art.

Scheme two:

According to acquiescence training sequence allocative decision of the prior art as can be known, a kind of value sequence of K is 16,14,12,10,8,6,4,2.In this programme, always distribute training sequence deviation on main antenna according to the situation of K-M+1=K ', the value of the K' under different K and M value condition in the present embodiment scheme two has been shown in table 2.

Table 2

In this programme, preferably, K' training sequence deviation can be front K' training sequence deviation in being shifted in order K the training sequence deviation that obtains.

In this programme, because the value of K' can be both that { value in 16,14,12,10,8,6,4,2} can be also the odd number value outside the value sequence of K in prior art for the value sequence of K in prior art.Therefore, in this programme, if K' training sequence deviation is front K' training sequence deviation in being shifted in order K the training sequence deviation that obtains, the value for K' is the situation of even number, and each training sequence deviation that obtains for the even number value of different K' and the mapping relations of spread spectrum code resources can adopt the mapping relations of giving tacit consent in prior art; Value for K' is the situation of odd number, need set in advance the mapping relations for odd number value each training sequence deviation that obtains and the spread spectrum code resources that is used for the transmission user signal of different K', and concrete set-up mode can have multiple.

The value that Fig. 3 a to Fig. 3 g shows respectively K' is a kind of mapping relations schematic diagram of 15,13,11,9,7,5,3 o'clock.

As shown in Fig. 3 a, be 15 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾, second training sequence deviation m ⁽²⁾Corresponding second spreading code c ₁₆ ⁽²⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾, the rest may be inferred, until the 14 training sequence deviation m ⁽¹⁴⁾Corresponding the 14 spreading code c ₁₆ ⁽¹⁴⁾, afterwards, the 15 training sequence deviation m ⁽¹⁵⁾Corresponding the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 b, be 13 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾, second training sequence deviation m ⁽²⁾Corresponding second spreading code c ₁₆ ⁽²⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾, the rest may be inferred, until the tenth training sequence deviation m ⁽¹⁰⁾Corresponding the tenth spreading code c ₁₆ ⁽¹⁰⁾, afterwards, the 11 training sequence deviation m ⁽¹¹⁾Corresponding the 11 spreading code c ₁₆ ⁽¹¹⁾With the 12 spreading code c ₁₆ ⁽¹²⁾, the 12 training sequence deviation m ⁽¹²⁾Corresponding the 13 spreading code c ₁₆ ⁽¹³⁾With the 14 spreading code c ₁₆ ⁽¹⁴⁾, the 13 training sequence deviation m ⁽¹³⁾Corresponding the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 c, be 11 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾, second training sequence deviation m ⁽²⁾Corresponding second spreading code c ₁₆ ⁽²⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾, the rest may be inferred, until the 6th training sequence deviation m ⁽⁶⁾Corresponding the 6th spreading code c ₁₆ ⁽⁶⁾, afterwards, the 7th training sequence deviation m ⁽⁷⁾Corresponding the 7th spreading code c ₁₆ ⁽⁷⁾With the 8th spreading code c ₁₆ ⁽⁸⁾, the 8th training sequence deviation m ⁽⁸⁾Corresponding the 9th spreading code c ₁₆ ⁽⁹⁾With the tenth spreading code c ₁₆ ⁽¹⁰⁾, the rest may be inferred, until the 11 training sequence deviation m ⁽¹¹⁾Corresponding the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 d, be 9 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾, second training sequence deviation m ⁽²⁾Corresponding second spreading code c ₁₆ ⁽²⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾With the 4th spreading code c ₁₆ ⁽⁴⁾, the 4th training sequence deviation m ⁽⁴⁾Corresponding the 5th spreading code c ₁₆ ⁽⁵⁾With the 6th spreading code c ₁₆ ⁽⁶⁾, the rest may be inferred, until the 9th training sequence deviation m ⁽⁹⁾Corresponding the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 e, be 7 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾With second spreading code c ₁₆ ⁽²⁾, second training sequence deviation m ⁽²⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾With the 4th spreading code c ₁₆ ⁽⁴⁾, the rest may be inferred, until the 6th training sequence deviation m ⁽⁹⁾Corresponding the 11 spreading code c ₁₆ ⁽¹¹⁾With the 12 spreading code c ₁₆ ⁽¹²⁾, afterwards, the 7th training sequence deviation m ⁽⁷⁾Corresponding the 13 spreading code c ₁₆ ⁽¹³⁾, the 14 spreading code c ₁₆ ⁽¹⁴⁾, the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 f, be 5 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾With second spreading code c ₁₆ ⁽²⁾, second training sequence deviation m ⁽²⁾Corresponding the 3rd spreading code c ₁₆ ⁽³⁾With the 4th spreading code c ₁₆ ⁽⁴⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 5th spreading code c ₁₆ ⁽⁵⁾, the 6th spreading code c ₁₆ ⁽⁶⁾, the 7th spreading code c ₁₆ ⁽⁷⁾With the 8th spreading code c ₁₆ ⁽⁸⁾, the 4th training sequence deviation m ⁽⁴⁾Corresponding the 9th spreading code c ₁₆ ⁽⁹⁾, the tenth spreading code c ₁₆ ⁽¹⁰⁾, the 11 spreading code c ₁₆ ⁽¹¹⁾With the 12 spreading code c ₁₆ ⁽¹²⁾, the 5th training sequence deviation m ⁽⁵⁾Corresponding the 13 spreading code c ₁₆ ⁽¹³⁾, the 14 spreading code c ₁₆ ⁽¹⁴⁾, the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

As shown in Fig. 3 g, be 3 o'clock in the K' value, be 16 spread spectrum code resources for spreading factor, first training sequence deviation m ⁽¹⁾Corresponding first spreading code c ₁₆ ⁽¹⁾, second spreading code c ₁₆ ⁽²⁾, the 3rd spreading code c ₁₆ ⁽³⁾With the 4th spreading code c ₁₆ ⁽⁴⁾, second training sequence deviation m ⁽²⁾Corresponding the 5th spreading code c ₁₆ ⁽⁵⁾, the 6th spreading code c ₁₆ ⁽⁶⁾, the 7th spreading code c ₁₆ ⁽⁷⁾With the 8th spreading code c ₁₆ ⁽⁸⁾, the 3rd training sequence deviation m ⁽³⁾Corresponding the 9th spreading code c ₁₆ ⁽⁹⁾, the tenth spreading code c ₁₆ ⁽¹⁰⁾, the 11 spreading code c ₁₆ ⁽¹¹⁾, the 12 spreading code c ₁₆ ⁽¹²⁾, the 13 spreading code c ₁₆ ⁽¹³⁾, the 14 spreading code c ₁₆ ⁽¹⁴⁾, the 15 spreading code c ₁₆ ⁽¹⁵⁾With the 16 spreading code c ₁₆ ⁽¹⁶⁾

Step 202 in the present embodiment can be carried out in terminal, and at this moment, in step 201, the value of M and K' also can be by base station controller (RNC) notice to base station and terminal.

When notifying the value of M and K ' by RNC by high-level signaling, can expand the information field (IE) of existing training sequence configuration, be the value of indication K' with the Field Definition of existing information field indicating K value, and the corresponding field that increases the value of indication M.For the K' value condition in the scheme two described in step 201, also can be further in information field the span of K ' be extended to the odd number value, as 15,13,11,9,7,5,3.When table 3 shows for the K' value condition in the scheme two described in step 201, to a kind of information table after the existing information field extension.

Table 3

as shown in the bolded section in table 3, in training sequence configuration (Midamble configuration) field, increased integer odd number value, be Integer (1, 3, 5, 7, 9, 11, 13, 15), and its definition can be consistent with the situation in agreement TS25.221.Note1., in this table, the required bit of training sequence configuration will expand to 4 by 3 in version (Release) 7, simultaneously as shown in bolded section, also increased a new field, be number of transmit antennas (Number of Antennas), wherein, the maximum antenna number can be MaxNumberOfAntennas.

In step 202, terminal can basis after the value that gets K ' and M

Determine the value of K, wherein,

The even number value supremum is got in expression.

Afterwards, can according to the value of K and the length L of basic training sequences, can calculate the long W of window of CIR, namely

Wherein, Expression rounds the numerical value infimum.

Because receiving terminal can be according to the mapping relations of training sequence deviation and spreading code and the spread spectrum code resources of transmission user signal, find the training sequence deviation corresponding with each user, the training sequence deviation that therefore can obtain k user on main antenna can be shown below:

$m^{k,1}={(m_1^{\left(k\right)},m_2^{\left(k\right)},...,m_{L+W-1}^{\left(k\right)})}^T,k=1,...,K^{\′}$

The overlying training sequence skew that receives on main antenna can be shown below:

${\mathrm{<figure-callout\; id="1"\; label="S"\; filenames="H2009100923608E00013.png,H2009100923608E00021.png"\; state="\{\{state\}\}">S</figure-callout>}}_1=\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,1}}{m}^{k,1},k=1,...,K^{\&prime;}$

The training sequence deviation that sends on m antenna in M-1 auxiliary antenna can be shown below:

$S_m=\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,m}}{m}^m=m^m\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,m}},k=1,...,K^{\&prime;},m=2,...,M$

P wherein _k,1The power of user k on main antenna, P _{K, m}The power of user k on m auxiliary antenna in M-1 auxiliary antenna, m ^{K, 1}The training sequence deviation of user k on main antenna, m ^mIt is all users' training sequence deviation on m antenna in M-1 auxiliary antenna.

At receiving terminal, channel estimation process to all users on main antenna is the same with a single aerial system multiuser channel algorithm for estimating in prior art, to on auxiliary antenna with the channel estimating total value of all user's gross powers, can calculate according to the training sequence deviation of distributing to this auxiliary antenna, afterwards, the user power ratio result that obtains from main antenna can be used for distinguishing the channel estimating of each user on each auxiliary antenna.

After the process multi-path channel transmission, the total reception signal on each antenna can be expressed as: e=GH+n.

Wherein, G=[G ^(1,1)G ^(2,1)G ^{(K ', 1)}G ⁽²⁾G ⁽³⁾G ^(M)], G ^{(k, 1)}The training sequence deviation matrix of k user on main antenna, G ^(m)Be the training sequence deviation matrix that on the auxiliary antenna of m root, all users use, and have:

$G^{(k,1)}=\left[\begin{array}{cccc}{m}_W^{(k,1)}& m_{W-1}^{(k,1)}& ...& m_1^{(k,1)}\\ .& & & \\ .& m_W^{(k,1)}& ...& m_2^{(k,1)}\\ .& & & \\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ m_{W+L-1}^{(k,1)}& m_{W+L-1}^{(k,1)}& ...& m_L^{(k,1)}\end{array}\right],$ $G^{\left(m\right)}=\left[\begin{array}{cccc}{m}_W^{\left(m\right)}& m_{W-1}^{\left(m\right)}& ...& m_1^{\left(m\right)}\\ .& & & \\ .& m_W^{\left(m\right)}& ...& m_2^{\left(m\right)}\\ .& .& & .\\ .& .& & .\\ .& .& ...& .\\ .& .& & .\\ m_{W+L-1}^{\left(m\right)}& m_{W+L-2}^{\left(m\right)}& ...& m_L^{\left(m\right)}\end{array}\right]$

Wherein, W is that the CIR window is long; L is the length of basic training sequences, for example, and L=128; H is the channel impulse response matrix corresponding to different antennae, can be expressed as:

$H={[\sqrt{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100923608E00013.png,H2009100923608E00021.png"\; state="\{\{state\}\}">P</figure-callout>}}_{\mathrm{1,1}}}{h}^{\left(\mathrm{1,1}\right)}...\sqrt{P_{K^{\&prime;},1}}{h}^{(K^{\&prime;},1)}\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,2}}{h}^{\left(2\right)}...\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,M}}{h}^{\left(M\right)}]}^T$

Wherein,

(k=1 ..., K') be the channel impulse response of k user on main antenna,

It is the channel impulse response on the auxiliary antenna of m root.Therefore, the size of G and H be respectively L * (K '+M-1) W and (K'+M-1) W * 1.

According to channel estimation method of the prior art, can utilize fast Fourier transform (FFT) to simplify calculating, Output rusults can be expressed as

M wherein _LIt is the basic training sequences of a residential quarter.Afterwards, on main antenna on all K' user's channel estimating and auxiliary antenna with the channel estimating total value of all user's gross powers all can from

In extract.

According to the channel estimating of all K' user on main antenna, can calculate each user's transmitting power ratio, be expressed as:

${\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="H2009100923608E00013.png,H2009100923608E00021.png"\; state="\{\{state\}\}">p</figure-callout>}}_1=\sqrt{{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100923608E00013.png,H2009100923608E00021.png"\; state="\{\{state\}\}">\; <figure-callout\; id="1"\; label="P"\; filenames="H2009100923608E00013.png,H2009100923608E00021.png"\; state="\{\{state\}\}">P</figure-callout>\; </figure-callout>}}_{\mathrm{1,1}}}/\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,1}},....,p_{K^{\&prime;}}=\sqrt{P_{K^{\&prime;},1}}/\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,1}}$

Because the transmitting power ratio of user on every transmit antennas is identical, therefore can estimate the channel of all K' user on each auxiliary antenna:

$h^{(k,2)}=p_k\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,2}}{h}^{\left(2\right)},....,h^{(k,M)}=p_k\underset{k=1}{\overset{K^{\&prime;}}{\mathrm{\&Sigma;}}}\sqrt{P_{k,M}}{h}^{\left(M\right)}(k=\mathrm{1,2},...,K^{\&prime;})$

Above channel estimation methods in multiaerial system in the embodiment of the present invention is described in detail, the below is described in detail the channel estimation system in multiaerial system in the embodiment of the present invention again.

Fig. 4 is the exemplary block diagram of the channel estimation system in multiaerial system in the embodiment of the present invention.As shown in Figure 4, this system comprises: base station and terminal.

Wherein, consistent with the channel estimation methods in multiaerial system in the embodiment of the present invention, in the present embodiment, the base station can be used for producing K training sequence deviation from a basic training sequences cyclic shift, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna, wherein, K, M and K ' are the integer greater than 0, and K'+M-1≤K.

Terminal can be used for the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculates the channel estimating of each user on main antenna; According to the channel estimation results of each user on main antenna, obtain each user's transmitting power ratio; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

Wherein, further, this system can comprise RNC further, is used for the value of determined M and the value of K' are notified respectively to base station and terminal.

Can there be multiple implementation base station in the present embodiment system when specific implementation, wherein a kind of can be as shown in Figure 5, Fig. 5 shows a kind of internal structure schematic diagram of base station in the embodiment of the present invention.This base station can comprise: training sequence distribution module and signal transmission module.

Wherein, the training sequence distribution module is used for producing K training sequence deviation from a basic training sequences cyclic shift, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna, wherein, K, M and K ' are the integer greater than 0, and K'+M-1≤K.

Signal transmission module is used for the allocation result according to described training sequence distribution module, transmitted signal on a described M antenna.Wherein, on main antenna, each user uses different training sequence deviation, and each user uses identical training sequence deviation in auxiliary antenna.

If the value of the value of M and K' is notified to base station and terminal by RNC, the base station can further comprise: information receiving module, be used for to receive the indication information from the value of the value that comprises M of base station controller and K ', the value of described M and the value of K' are offered described training sequence distribution module.

Consistent with the channel estimation methods in the embodiment of the present invention, described in this system

Wherein,

The even number value infimum is got in expression; Perhaps, described K '=K-M+1.

Terminal in the present embodiment system also can have multiple implementation when specific implementation, wherein a kind of can be as shown in Figure 6, Fig. 6 shows a kind of internal structure schematic diagram of terminal in the embodiment of the present invention.This terminal can comprise: main antenna channel estimation module and auxiliary antenna channel estimation module.

Wherein, the main antenna channel estimation module is used for the signal from main antenna, according to the training sequence deviation corresponding with each user, calculates the channel estimating of each user on main antenna.

Auxiliary antenna channel estimation module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

During specific implementation, auxiliary antenna channel estimation module also can have multiple way of realization, and Fig. 7 shows wherein a kind of internal structure schematic diagram of way of realization.As shown in Figure 7, this auxiliary antenna channel estimation module can comprise: power proportions calculating sub module, channel estimating total value calculating sub module and channel estimation calculation submodule.

Wherein, the power proportions calculating sub module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio.

Channel estimating total value calculating sub module is used for the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculates the channel estimating total value of all users on this auxiliary antenna.

The channel estimation calculation submodule is used for the channel estimating total value of all users on each user's of obtaining according to described power proportions calculating sub module transmitting power ratio and each auxiliary antenna that described channel estimating total value calculating sub module is calculated, calculates the channel estimating of each user on each auxiliary antenna.

In the mimo system of reality, uncorrelated between antenna, antenna port represents real antenna, and the antenna port number is real antenna number; For the mimo system of 8 antenna smart antenna structures, antenna port represents virtual concept, and the antenna port number is the virtual-antenna number, during the specific implementation virtual-antenna, kinds of schemes can be arranged.In fact antenna described in the present invention is antenna port, easy for describing, vivid, has adopted the statement of " antenna " in the present invention, in practical application, is interpreted as antenna port.

In addition, the user described in foregoing description of the present invention generally refers to multithread user (comprising double-current user), namely in downlink system, all use the description of the situation that adopts per family multithread transmission (comprising stream transmission).In practical application, sometimes the situation that exists single double fluid to coexist, at this moment, in the embodiment of the present invention, after K the training sequence deviation of generation that be shifted by basic training sequences, can choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation according to the multithread number of users K' in the user, the K' on this main antenna multithread user is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' multithread user on every auxiliary antenna.Wherein, K, M and K' are the integer greater than 0, and K '+M-1≤K.

Afterwards, to the signal from main antenna, the training sequence deviation corresponding according to each multithread user, each multithread user's channel estimating on the calculating main antenna; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all multithread users on this auxiliary antenna; Channel estimation results according to each multithread user on main antenna, obtain each multithread user's transmitting power ratio, according to the channel estimating total value of all multithread users on described transmitting power ratio and each auxiliary antenna, calculate the channel estimating of each multithread user on each auxiliary antenna.

And can be comprised by the basic training sequences process that produces K training sequence deviation that is shifted: determine that according to the number of users Ku on antenna number M and M antenna the CIR window is long; Long according to described window, basic training sequences is shifted, obtain K training sequence deviation, K=Ku+M-1, Ku is more than or equal to K'.

If Ku user comprises Kd single current user, can further according to the single current number of users Kd in the user, choose Kd training sequence deviation and distribute to M the Kd on an antenna single current user from K training sequence deviation; To the signal from every antenna, the training sequence deviation corresponding according to each single current user calculated the channel estimating of each single current user on this antenna.

Through the above description of the embodiments, one of ordinary skill in the art can be well understood to the present invention and can realize by the mode that software add the general generalized computing machine equipment (can be understood as the hardware platform with certain versatility) of this software of operation of having the ability; Can certainly adopt the mode of hardware designs to realize.In addition, described in the embodiment of the present invention in system the Module Division in base station and terminal other different demarcation mode also can be arranged, be not limited to mode cited in the embodiment of the present invention.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprises that some instructions are used so that aforementioned general hardware platform is carried out the described scheme of each embodiment of the present invention.

Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only preferred embodiment of the present invention; be not for limiting protection scope of the present invention; within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (11)

1. the channel estimation methods in the antenna downlink system more than a kind is characterized in that:

A, being shifted by basic training sequences produces K training sequence deviation, chooses K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, and each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of the individual user of K ' on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K '+M-1≤K;

B, to the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculate the channel estimating of each user on main antenna; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna;

According to the channel estimation results of each user on main antenna, obtain each user's transmitting power ratio, according to the channel estimating total value of all users on described transmitting power ratio and each auxiliary antenna, calculate the channel estimating of each user on each auxiliary antenna.

2. the method for claim 1, is characterized in that, and is described

Wherein,

The even number value infimum is got in expression;

Perhaps, described K'=K-M+1.

3. method as claimed in claim 2, is characterized in that, further comprises before steps A: the mapping relations for odd number value each training sequence deviation that obtains and the spread spectrum code resources that is used for the transmission user signal of different K' are set.

4. the method for claim 1, is characterized in that, described steps A is carried out in the base station, and described step B carries out in terminal;

Before described steps A, further comprise: base station controller indicates the value of M and the value of K ' to the base station;

Before described step B, further comprise: base station controller indicates the value of M and the value of K' to terminal;

Described base station and described terminal are according to formula

Determine the value of K, wherein,

The even number value supremum is got in expression.

5. method as described in any one in claim 1 to 4, is characterized in that, the individual training sequence deviation of described K ' is: front K' training sequence deviation in K the training sequence deviation that obtains that be shifted in order.

6. the base station in the antenna downlink system more than a kind, is characterized in that, this base station comprises:

The training sequence distribution module, be used for being shifted by basic training sequences and produce K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of K' user on every auxiliary antenna; Wherein, K, M and K ' are the integer greater than 0, and K'+M-1≤K;

Signal transmission module, be used for the allocation result according to described training sequence distribution module, send a signal to terminal on a described M antenna, be used for terminal to the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculate the channel estimating of each user on main antenna; Channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, to the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

7. base station as claimed in claim 6, it is characterized in that, this base station further comprises: information receiving module, be used for to receive the indication information from the value of the value that comprises M of base station controller and K', and the value of described M and the value of K' are offered described training sequence distribution module.

8. base station as described in claim 6 or 7, is characterized in that, and is described

Wherein,

The even number value infimum is got in expression;

Perhaps, described K'=K-M+1.

9. the terminal in the antenna downlink system more than a kind, is characterized in that, this terminal comprises:

The main antenna channel estimation module is used for the signal from main antenna, according to the training sequence deviation corresponding with each user, calculates the channel estimating of each user on main antenna;

Auxiliary antenna channel estimation module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio; To the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna;

Described from main antenna signal and produced according to following method by the base station from the signal of each auxiliary antenna: being shifted by basic training sequences produces K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of the individual user of K ' on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K '+M-1≤K.

10. terminal as claimed in claim 9, is characterized in that, described auxiliary antenna channel estimation module comprises:

The power proportions calculating sub module is used for the channel estimation results according to each user on main antenna, obtains each user's transmitting power ratio;

Channel estimating total value calculating sub module is used for the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculates the channel estimating total value of all users on this auxiliary antenna;

The channel estimation calculation submodule, be used for the channel estimating total value of all users on each user's of obtaining according to described power proportions calculating sub module transmitting power ratio and each auxiliary antenna that described channel estimating total value calculating sub module is calculated, calculate the channel estimating of each user on each auxiliary antenna.

11. the channel estimation system more than a kind in the antenna downlink system is characterized in that, this system comprises:

The base station, be used for being shifted by basic training sequences and produce K training sequence deviation, choose K' training sequence deviation and distribute to the main antenna of setting in M antenna from K training sequence deviation, each user on this main antenna is respectively with a training sequence deviation; From remaining training sequence deviation for the auxiliary antenna of M-1 root of setting in M antenna respectively distributes a training sequence deviation, the shared training sequence deviation of the individual user of K ' on every auxiliary antenna; Wherein, K, M and K' are the integer greater than 0, and K'+M-1≤K;

Terminal is used for the signal from main antenna, according to training sequence deviation corresponding with each user in K' training sequence deviation, calculates the channel estimating of each user on main antenna; Channel estimation results according to each user on main antenna, obtain each user's transmitting power ratio, to the signal from each auxiliary antenna, according to the training sequence deviation of distributing to this auxiliary antenna, calculate the channel estimating total value of all users on this auxiliary antenna, according to described channel estimating total value and described each user's transmitting power ratio, calculate the channel estimating of each user on this auxiliary antenna.

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