CN103297112B - A kind of method and device utilizing spaced antenna reception data - Google Patents

Abstract

The invention discloses a kind of method and apparatus utilizing spaced antenna to receive data, the method comprises: for same user, determines the received signal quality in each antenna channels; Filter out the antenna channels that received signal quality meets setting requirement; Frequency-domain received signal from described user in each antenna channels filtered out is processed, obtains the source bits from described user.The present invention, owing to carrying out antenna channels screening according to received signal quality, can effectively reduce process complexity; In the antenna channels of screening, Received signal strength reliability is higher, improves the reliability of detection relative to prior art.

Description

A kind of method and device utilizing spaced antenna reception data

Technical field

The present invention relates to wireless communication technology field, particularly relate to a kind of method and the device that utilize spaced antenna reception data.

Background technology

Some special scenes is there is in cellular wireless mobile communication network, as: area, indoor and outdoor boundary; The different floor of in-door covering, region; Highway, Along Railway, subway are along the line, blind area point etc. under tower.Under these scenes, terminal is when fast moving, and ubiquity signal fadeout change is fast, gravity treatment and the bad setting of switching band, if it is frequent to arrange the unreasonable Signalling exchange that easily causes, and causes call drop, affects client perception.For the switching problem of these scenes, there is certain defect in traditional realization or optimization method.

For traditional scheme institute produced problem, at LTE (LongTermEvolution, Long Term Evolution) in the actual networking of system suggestion adopt spaced antenna technology, i.e. cell combining technology, by multiple RRU (RadioRemoteUnit, RF far-end module) be configured in same logic district, carry out cell combining, be equivalent to and expand logic district coverage.Spaced antenna technology decreases switching in coverage, reselection frequency, reduces Signalling exchange, thus reduces and switch cutting off rate.

If Fig. 1 is a kind of typical scene schematic diagram adopting spaced antenna technology in LTE system, same BBU (BaseBandUnit, baseband processing unit) is connected to two RRU, merges the outdoor uplink cells of two RRU.Wherein, BBU comprises outdoor and indoor BBU.

Spaced antenna technology is adopted to want emphasis to consider receiver detection method in LTE system.In uplink receiving direction, after Data Detection, the reception data of the same user from same logic district different RRUs are merged, be equivalent to improve receiving gain by a kind of form of space diversity.

In LTE system, receiver generally adopts associated detecting method, and the frequency domain data on the antenna corresponding to all RRU carries out joint-detection, and as shown in Figure 2, detailed process is as follows:

All RRU that the BBU of eNB (evolvedNodeB) is corresponding are transferred to BBU the time domain data that respective antenna receives, the time domain data of BBU to each antenna of multiple RRU of eNB carries out OFDM (OrthogonalFrequencyDivisionMultiplexing respectively, OFDM) demodulation, obtain the frequency domain data received from each antenna of multiple RRU;

Pilot tone pilot is used to carry out the domain channel response of each antenna of the channel estimating corresponding multiple RRU of acquisition;

Utilize domain channel response to carry out joint-detection to the frequency domain data received, be specially and association frequency domain equilibrium is carried out to the frequency domain data received from each antenna of multiple RRU and domain channel response;

By the frequency domain soft symbol that obtains after association frequency domain equilibrium by IDFT (InverseDiscreteFourierTransform, inverse discrete Fourier transformer inverse-discrete) transform to time domain and obtain time domain soft symbol, again demodulation is carried out to time domain soft symbol and obtain the soft bit of time domain, then obtain the source bits of user through decoding.

When carrying out joint-detection, the data that each for multiple RRU antenna receives are equivalent to the reception data of the different antennae from same RRU, thus adopt space division multiplexing SDM detection method.

Under space division multiplexing scene, suppose that signal sending end antenna amount is M, receiving terminal antenna amount is N.SDM detection method detailed process is as follows:

The frequency-region signal vector that a note kth subcarrier sends is s _k=[s ₁(k) s ₂(k) ... s _m(k)] ^t, wherein s _mk () is the kth sub-carrier signal that m root antenna sends, k represents sub-carrier indices, 1≤k≤N _sc, N _screpresent the subcarrier number that this user data takies, s _kfor the column vector of M*1;

The frequency domain resultant signal vector r that a kth subcarrier receives _kfor: r _k=[r ₁(k) r ₂(k) ... r _n(k)] ^t, wherein, r _nk () represents the frequency domain resultant signal at n-th antenna, a kth received over subcarriers, r _kfor the column vector of N*1.

The additive noise vector W that a kth subcarrier receives _kfor W _k=[W ₁(k) W ₂(k) ... W _n(k)] ^t, wherein, W _nk () represents the noise at n-th antenna, a kth received over subcarriers, W _kfor the column vector of N*1.

For each subcarrier k, use the channel response matrix H that pilot tone is calculated by channel estimation module _kfor:

Then the receive channel model of frequency domain equivalence is:

r _k＝H _ks _k+W _k

So, use joint detection algorithm to consider the channel information of multiple antenna simultaneously, the balanced matrix of association frequency domain is determined according to pilot channel response matrix H k, to obtain transmission signal vector corresponding on whole transmitting antenna, particularly, combined channel equalizer adopts the balanced matrix of the following two kinds mode determination association frequency domain:

Mode 1, uses the balanced matrix of ZF (ZeroForcing, ZF) detection algorithm determination association frequency domain

The then balanced matrix of association frequency domain

Calculate transmission signal vector corresponding on whole transmitting antenna

Mode 2, uses the balanced matrix of least mean-square error (MinimumMeanSquareError, MMSE) detection algorithm determination association frequency domain

The then balanced matrix of association frequency domain $w_k={(H_k^H{H}_k+{\mathrm{\σ}}_k^2{I}_M)}^{-1}{H}_k^M,$

Calculate transmission signal vector corresponding on whole transmitting antenna

Wherein, for noise power, I _mfor the unit matrix of M*M.

But adopt existing associated detecting method to have following defect:

1) in united detection processing process, for the receiving symbol in each subcarrier in frequency domain, all need the balanced matrix of the association frequency domain of structure M*N and carry out inversion operation, when user uplink data amount is larger, process complexity is higher;

2) when other RRU is distant apart from certain RRU close together for UE, the received signal power on some RRU passage is less, reception Signal to Interference plus Noise Ratio is lower, if this UE still adopts joint-detection, receptivity can be caused on the contrary to decline.

Summary of the invention

The invention provides a kind of spaced antenna that utilizes and receive the method for data and device, in order to solve the Received signal strength detection of complex that exists in prior art and easily to cause the problem that detection perform worsens.

The invention provides a kind of method utilizing spaced antenna to receive data, comprising:

For same user, determine the received signal quality in each antenna channels;

Filter out the antenna channels that received signal quality meets setting requirement;

Frequency-domain received signal from described user in each antenna channels filtered out is processed, obtains the source bits from described user.

The present invention also provides a kind of device utilizing spaced antenna to receive data, comprising:

Signal quality determining unit, for for same user, determines the received signal quality in each antenna channels;

Channel screen unit, meets the antenna channels of setting requirement for filtering out received signal quality;

Signal processing unit, for processing the frequency-domain received signal from described user in each antenna channels filtered out, obtains the source bits from described user.

The device utilizing spaced antenna to receive data provided by the invention has following beneficial effect: owing to carrying out antenna channels screening according to received signal quality, can effectively reduce process complexity; Owing to carrying out antenna channels screening according to received signal quality, in the antenna channels of screening, Received signal strength reliability is higher, improves the reliability of detection relative to prior art.

Accompanying drawing explanation

Fig. 1 is a kind of typical scene schematic diagram adopting spaced antenna technology in LTE system;

Fig. 2 is the schematic flow sheet that existing employing spaced antenna technology receives data;

Fig. 3 is that the present invention utilizes spaced antenna to receive the method flow diagram of data;

Fig. 4 is that the embodiment of the present invention 1 utilizes spaced antenna to receive the method flow schematic diagram of data;

Fig. 5 is that the embodiment of the present invention 2 utilizes spaced antenna to receive the method flow schematic diagram of data;

Fig. 6 is that the embodiment of the present invention 3 utilizes spaced antenna to receive the method flow schematic diagram of data;

Fig. 7 is that the embodiment of the present invention 4 utilizes spaced antenna to receive the method flow schematic diagram of data;

Fig. 8 is that the embodiment of the present invention utilizes spaced antenna to receive the structure drawing of device of data.

Embodiment

Below in conjunction with drawings and Examples, the method and apparatus utilizing spaced antenna to receive data provided by the invention is illustrated in greater detail.

For up spaced antenna scene, the receiver Received signal strength of LTE system eNB generally adopts associated detecting method, joint-detection is carried out to the signal in all antenna channels, there is implementation complexity high, need the problem of the propagation delay time considered between each RRU, and due to some antenna channels received signal quality poor (such as: Signal to Interference plus Noise Ratio SINR that is less or Received signal strength is lower for received signal power) thus the problem causing detection perform to worsen.

For this problem, the embodiment of the present invention proposes a kind of spaced antenna that utilizes being applied to LTE system and receives the method for data, and as shown in Figure 3, the method comprises:

Step 301, for same user, determines the received signal quality in each antenna channels;

Particularly, the parameter of various reaction received signal quality can be adopted, determine the received signal quality in antenna channels.

Step 302, filters out the antenna channels that received signal quality meets setting requirement;

If received signal quality is poor, then illustrate that the signal quality of antenna channels is poor and do not meet setting requirement, the screening of the antenna channels of these received signal quality differences is fallen, as abandoned the data on these antenna passage, the data namely received from these antenna passage can not participate in follow-up data processing.

Step 303, processes the frequency-domain received signal from described user in each antenna channels filtered out, obtains the source bits from described user.

The present embodiment owing to carrying out antenna channels screening according to received signal quality, the antenna channels of some poor signal quality screened fall, therefore, it is possible to effectively reduce process complexity; Owing to carrying out antenna channels screening according to received signal quality, in the antenna channels of screening, Received signal strength reliability is higher, improves the reliability of detection relative to prior art.

Determine that the parameter of received signal quality has various, can determine flexibly as required, preferably, the present embodiment, for same user, is determined the received signal quality in each antenna channels, is specifically comprised:

OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtains the frequency-domain received signal from same user in each antenna channels;

Determine from the modulus value of the frequency-domain received signal of same user or performance number in each antenna channels, thus determine the received signal quality in each antenna channels.

Wherein, before carrying out OFDM demodulation, may further include removal pilot signal, after the ofdm demodulation, the step removing frequency deviation can also be comprised.

Certainly, the decision parameter of the received signal quality in certain antenna channels including but not limited to Received signal strength modulus value and received signal power etc., such as, can also be the Signal to Interference plus Noise Ratio SINR of Received signal strength.

Preferably, filter out the antenna channels that received signal quality meets setting requirement, specifically comprise:

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal; Or

Filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

Current, can also be the Signal to Interference plus Noise Ratio SINR that filters out Received signal strength higher than the antenna channels of setting SINR or alternate manner.

Preferably, described setting modulus value/setting power value is determined in the following way:

Determine the maximum modulus value/maximum power value from the frequency-domain received signal of same user in each antenna channels;

Described maximum modulus value/maximum power value and setting coefficient product are obtained setting modulus value/setting power value, the described setting factor be less than 1 positive number.

Set the factor particularly can set as required, as receiver handling property than good and amount of user data is smaller time, the setting factor can get value less between 0 ~ 1, when receiver handling property is poor and amount of user data is larger, and the value that the setting factor can be larger between 0 ~ 1.

Preferably, setting can get 0.5, or the numerical value of about 0.5.

Preferably, the above-mentioned method utilizing spaced antenna to receive data is performed at the BBU of eNodeB, particularly, in the front end processing block of BBU, OFDM symbol demodulation is carried out for the time-domain received signal in multiple antenna channels and adjudicates, namely only have when the frequency-domain received signal quality in certain antenna channels is higher than certain threshold value, just the Received signal strength in this antenna channels is exported and participate in subsequent treatment, otherwise do not export participation subsequent treatment.

The method that the embodiment of the present invention provides is applied to Long Term Evolution frequency division multiplexing LTEFDD system or is applied to Long Term Evolution time division multiplexing LTE TDD system.If have employed OFDM frequency multiplexing technique, need for each subcarrier, the frequency-domain received signal from described user in each antenna channels filtered out is processed, carries out channel estimating and frequency domain equalization.

To the concrete mode that the frequency-domain received signal from described user in each antenna channels filtered out processes, preferably adopt the mode that embodiment below provides.

Embodiment 1

In the present embodiment, as shown in Figure 4, the method utilizing spaced antenna to receive data specifically comprises:

1) OFDM symbol demodulation

For same user, OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtain the frequency-domain received signal from same user, i.e. frequency domain data in each antenna channels.

2) antenna channels is selected

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal, or filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

3) channel estimating is carried out

Channel is estimated to obtain channel response matrix H by the channel response matrix that each antenna channels of obtaining filtering out is corresponding ₁~ H _n, N is the sum of the antenna channels filtered out.

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels.

Particularly, the channel response matrix of each antenna channels can be utilized, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the frequency domain equalization matrix of this antenna channels.

4) frequency domain equalization

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of the described user that the time-domain received signal of this antenna channels obtains after OFDM symbol demodulation, obtain the frequency domain soft symbol of this antenna channels, suppose that the user's frequency-domain received signal in the antenna channels that filters out is r ₁~ r _n, after frequency domain equalization, obtain frequency domain soft symbol s ₁~ s _n.

5) merge

The frequency domain soft symbol of all antenna channels filtered out is merged, obtains the frequency domain soft symbol s obtained after merging.Particularly, merging here refers to linear combining.

6) IDFT time-frequency conversion

The frequency domain soft symbol s obtained after being combined carries out IDFT time-frequency conversion and obtains time domain soft symbol, specifically through IDFT, frequency domain soft symbol s is transformed to time domain from frequency domain.

7) demodulation

Carry out demodulation to time domain soft symbol and obtain the soft bit of time domain, the code modulation mode adopted when concrete demodulation mechanism and user send data is relevant.

8) decoding

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

Embodiment 2

In the present embodiment, as shown in Figure 5, the method utilizing spaced antenna to receive data specifically comprises:

1) OFDM symbol demodulation

For same user, OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtain the frequency-domain received signal from same user, i.e. frequency domain data in each antenna channels.

2) antenna channels is selected

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal, or filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

3) channel estimating is carried out

Channel is estimated to obtain channel response matrix H by the channel response matrix that each antenna channels of obtaining filtering out is corresponding ₁~ H _n, N is the sum of the antenna channels filtered out.

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels.

Particularly, the channel response matrix of each antenna channels can be utilized, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the frequency domain equalization matrix of this antenna channels.

4) frequency domain equalization

Utilize the frequency domain equalization matrix of each antenna channels, the frequency-domain received signal of the described user obtained after OFDM symbol demodulation the time-domain received signal in this antenna channels carries out frequency domain equalization, obtain the frequency domain soft symbol of this antenna channels, suppose that the user's frequency-domain received signal in the antenna channels that filters out is r ₁~ r _n, after frequency domain equalization, obtain frequency domain soft symbol s ₁~ s _n.

5) IDFT time-frequency conversion

The time domain soft symbol that IDFT time-frequency conversion obtains this antenna channels is carried out to the frequency domain soft symbol of each antenna channels, specifically through IDFT by frequency domain soft symbol s ₁~ s _ntime domain is transformed to from frequency domain.

6) merge

The time domain soft symbol of all antenna channels filtered out is merged.Particularly, merging here refers to linear combining.

7) demodulation

The time domain soft symbol obtained after being combined carries out demodulation and obtains the soft bit of time domain, and the code modulation mode adopted when concrete demodulation mechanism and user send data is relevant.

8) decoding

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

Embodiment 3

In the present embodiment, as shown in Figure 6, the method utilizing spaced antenna to receive data specifically comprises:

1) OFDM symbol demodulation

For same user, OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtain the frequency-domain received signal from same user, i.e. frequency domain data in each antenna channels.

2) antenna channels is selected

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal, or filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

3) channel estimating is carried out

Channel is estimated to obtain channel response matrix H by the channel response matrix that each antenna channels of obtaining filtering out is corresponding ₁~ H _n, N is the sum of the antenna channels filtered out.

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels.

Particularly, the channel response matrix of each antenna channels can be utilized, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the frequency domain equalization matrix of this antenna channels.

4) frequency domain equalization

Utilize the frequency domain equalization matrix of each antenna channels, the frequency-domain received signal of the described user obtained after OFDM symbol demodulation the time-domain received signal in this antenna channels carries out frequency domain equalization, obtain the frequency domain soft symbol of this antenna channels, suppose that the user's frequency-domain received signal in the antenna channels that filters out is r ₁~ r _n, after frequency domain equalization, obtain frequency domain soft symbol s ₁~ s _n.

5) IDFT time-frequency conversion

The time domain soft symbol that IDFT time-frequency conversion obtains this antenna channels is carried out to the frequency domain soft symbol of each antenna channels, specifically through IDFT by frequency domain soft symbol s ₁~ s _ntime domain is transformed to from frequency domain.

6) demodulation

Carry out to the time domain soft symbol of each antenna channels the soft bit of time domain that demodulation obtains this antenna channels, the code modulation mode adopted when concrete demodulation mechanism and user send data is relevant.

7) merge

Merge the soft bit of time domain of all antenna channels filtered out and obtain the soft bit of time domain, particularly, merging here refers to linear combining.

8) decoding

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

Embodiment 4

In the present embodiment, as shown in Figure 7, the method utilizing spaced antenna to receive data specifically comprises:

1) OFDM symbol demodulation

For same user, OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtain the frequency-domain received signal from same user, i.e. frequency domain data in each antenna channels.

2) antenna channels is selected

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal, or filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

3) channel estimating is carried out

Channel is estimated to obtain channel response matrix H by the channel response matrix that each antenna channels of obtaining filtering out is corresponding ₁~ H _n, N is the sum of the antenna channels filtered out.

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels.

Particularly, the channel response matrix of each antenna channels can be utilized, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the frequency domain equalization matrix of this antenna channels.

4) association frequency domain is balanced

The channel response matrix of all antenna channels filtered out is utilized to obtain the balanced matrix of association frequency domain, by channel response matrix H ₁~ H _nby rows, every capable arrangement combined channel response matrix.

Particularly, utilize the channel response matrix of all antenna channels filtered out, i.e. combined channel response matrix, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the balanced matrix of association frequency domain.

Utilize the balanced matrix of association frequency domain, association frequency domain equilibrium is carried out to the frequency-domain received signal of the described user that the time-domain received signal in all antenna channels filtered out obtains after OFDM symbol demodulation, obtains frequency domain soft symbol.

Suppose that the user's frequency-domain received signal in the antenna channels that filters out is r ₁~ r _n, after frequency domain equalization, obtain frequency domain soft symbol s.

5) IDFT time-frequency conversion

Carry out IDFT time-frequency conversion obtain time domain soft symbol to obtaining frequency domain soft symbol s, specifically through IDFT, frequency domain soft symbol s is transformed to time domain from frequency domain.

6) demodulation

Carry out demodulation to the time domain soft symbol obtained and obtain the soft bit of time domain, the code modulation mode adopted when concrete demodulation mechanism and user send data is relevant.

7) decoding

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

Embodiment 5

The present embodiment is given in BBU and connects multiple RRU, and under the multiple subcarrier scene of employing, the mode provided with embodiment 1 carries out the detailed process that spaced antenna receives the method for data.

Without loss of generality, the up transmitting antenna number of the present embodiment hypothesis UE is 1, i.e. M=1, each RRU only have a reception antenna, and corresponding to a receive path, a BBU is connected to altogether 4 RRU, i.e. N=4.

Initializing variable P _max=0, P _maxfor representing the maximal received power of all antenna channels.

Step 1, for all antenna channels from 0 open numbering, remembers that total antenna channels number is N, initialization antenna channels index n=0;

Step 2, on the passage being numbered n, carries out the operation of step 2.1 to step 2.4 respectively

Step 2.1, first goes CP, OFDM demodulation to the time-domain signal received, and removes the operations such as 7.5KHz frequency deviation, obtains frequency-domain received signal;

Step 2.2, calculates the gross power P of frequency-domain received signal on the n-th passage _n:

r _n(k)＝H _n(k)s _k+W _n(k)＝H _n1(k)s ₁(k)+W _n(k)

Wherein, r _nk () is the frequency-domain received signal in the n-th antenna channels, k represents sub-carrier indices, 1≤k≤N _sc, N _screpresent the subcarrier number that this user data takies;

The frequency-region signal that a transmitting antenna kth subcarrier of user terminal UE sends is s _k=[s ₁(k) s ₂(k) ... s _m(k)] ^t=s ₁(k);

At a kth subcarrier, total frequency-region signal that in n-th antenna channels, eNB receives is r _n(k) (1 <=n <=N);

At a kth subcarrier, the additive noise signal that on n-th passage, eNB receives is W _n(k) (1 <=n <=N);

For each subcarrier k, the channel response H on n-th reception antenna _n(k) (row vector of 1*M, M=1, therefore be scalar) be: H _n(k)=[H _n1(k), H _n2(k) ..., H _nM(k)]=H _n1(k).

Step 2.3, record P _n, and by judging P _nand P _maxsize, more new variables P _max:

$P_{\max }=\left\{\begin{array}{ccc}{P}_n,& \mathrm{if}& P_n>P_{\max }\\ P_{\max },& \mathrm{if}& P_n\&le;P_{\max }\end{array}\right.$

Step 2.4, as n=N-1, obtains final P _max, enter step 3; Otherwise, make n=n+1, enter step 2.1.

Step 3, from first passage, successively by the P of the n-th antenna channels _nwith threshold value η % × P _maxcompare:

Work as P _n-η % × P _maxwhen>=0, judge that by this antenna channels be effective antenna channels, counting to get total effective antenna channels number is N _useful;

Otherwise, work as P _n-η % × P _max< 0, judges that this antenna channels is invalid antenna channels, abandons the Received signal strength in this antenna channels, do not enter subsequent treatment.

Wherein, η % is the effective passage decision threshold prestored, and is the numerical value between 0 ~ 1.

Step 4, utilizes pilot signal to carry out the channel estimating of each antenna channels, and interpolation obtains user's frequency domain data signal r on a kth subcarrier _nk domain channel response value H that () is corresponding _n(k);

Step 5, carries out channel equalization, obtains the frequency domain soft symbol s after a kth subcarrier upper signal channel equilibrium _n(k);

Suppose that channel equalizer uses ZF detection algorithm, then, on a kth subcarrier, frequency domain equalization matrix corresponding to n-th antenna channels is:

$w_n\left(k\right)={\left(H_n^H\left(k\right)H_n\left(k\right)\right)}^{-1}{H}_n{\left(k\right)}^H={\left(H_{n1}{\left(k\right)}^H{H}_{n1}\left(k\right)\right)}^{-1}{H}_{n1}{\left(k\right)}^H$

Then frequency-domain equalizer output signal is:

${\hat{s}}_n\left(k\right)=w_n\left(k\right)r_n={\left(H_n^H\left(k\right)H_n\left(k\right)\right)}^{-1}{H}_n{\left(k\right)}^H{r}_n\left(k\right)={\left(H_{n1}{\left(k\right)}^H{H}_{n1}\left(k\right)\right)}^{-1}{H}_{n1}{\left(k\right)}^H{r}_n\left(k\right)$

Wherein, 0≤n≤N _useful-1

Step 6, carries out linear superposition by the frequency domain soft symbol that whole antenna channels frequency-domain equalizer exports, and obtains merging soft symbol s (k) exported on a kth subcarrier:

$s\left(k\right)=\underset{n=0}{\overset{N_{\mathrm{useful}}-1}{\mathrm{\&Sigma;}}}{\hat{s}}_n\left(k\right)$

Step 7, on the kth subcarrier being combined output, soft symbol s (k) carries out IDFT conversion and soft demodulation, obtains the soft bit Softbit_stream of time domain on the subcarrier of the kth after demodulation;

Step 8, carries out channel decoding to the soft bit Softbit_stream of the time domain on a kth subcarrier, obtains the source bits received.

The embodiment of the present invention, relative to prior art, has following beneficial effect:

1) relative to the joint detection algorithm of prior art, the present invention can effectively reduce process complexity;

2) when other RRU is concrete far away apart from certain RRU close together for UE, reception Signal to Interference plus Noise Ratio on some RRU passage is lower, by selecting decision algorithm to judge, on effective passage that guarantee chooses, Received signal strength reliability is higher, improves the reliability of detection relative to prior art in the present invention.

Based on same inventive concept, a kind of device utilizing spaced antenna to receive data is additionally provided in the embodiment of the present invention, the principle of dealing with problems due to this device is similar to a kind of method utilizing spaced antenna to receive data, therefore the enforcement of these equipment see the enforcement of method, can repeat part and repeats no more.

The present embodiment provides a kind of device utilizing spaced antenna to receive data, as shown in Figure 8, comprising:

Signal quality determining unit 801, for for same user, determines the received signal quality in each antenna channels;

Channel screen unit 802, meets the antenna channels of setting requirement for filtering out received signal quality;

Signal processing unit 803, for processing the frequency-domain received signal from described user in each antenna channels filtered out, obtains the source bits from described user.

Preferably, described signal quality determining unit 801, for same user, is determined the received signal quality in each antenna channels, is specifically comprised:

OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtains the frequency-domain received signal from same user in each antenna channels;

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Channel screen unit 802 filters out the antenna channels that received signal quality meets setting requirement, comprising:

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal; Or

Filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

Preferably, described setting modulus value/setting power value that described channel screen unit 802 uses is determined in the following way:

Determine the maximum modulus value/maximum power value from the frequency-domain received signal of same user in each antenna channels;

Described maximum modulus value/maximum power value and setting coefficient product are obtained setting modulus value/setting power value, the described setting factor be less than 1 positive number.

Preferably, signal processing unit 803 processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of the described user that the time-domain received signal of this antenna channels obtains after OFDM symbol demodulation, obtains the frequency domain soft symbol of this antenna channels;

The frequency domain soft symbol of all antenna channels filtered out is merged;

The frequency domain soft symbol obtained after being combined carries out IDFT time-frequency conversion and obtains time domain soft symbol;

Demodulation is carried out to time domain soft symbol and obtains the soft bit of time domain;

The source bits that decoding obtains described user is carried out to the soft bit of time domain.

Preferably, signal processing unit 803 processes the frequency-domain received signal in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

The time domain soft symbol that IDFT time-frequency conversion obtains this antenna channels is carried out to the frequency domain soft symbol of each antenna channels;

The time domain soft symbol of all antenna channels filtered out is merged;

The time domain soft symbol obtained after being combined carries out demodulation and obtains the soft bit of time domain;

The source bits that decoding obtains described user is carried out to the soft bit of time domain.

Preferably, signal processing unit 803 processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, the frequency-domain received signal of the described user obtained after OFDM symbol demodulation the time-domain received signal in this antenna channels carries out frequency domain equalization, obtains the frequency domain soft symbol of this antenna channels;

The time domain soft symbol that IDFT time-frequency conversion obtains this antenna channels is carried out to the frequency domain soft symbol of each antenna channels;

The soft bit of time domain that demodulation obtains this antenna channels is carried out to the time domain soft symbol of each antenna channels;

The soft bit of the time domain of all antenna channels filtered out is merged, obtains the soft bit of time domain;

The source bits that decoding obtains described user is carried out to the soft bit of time domain.

Preferably, signal processing unit 803 processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Frequency-domain received signal from described user in each antenna channels filtered out is processed, specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of all antenna channels filtered out is utilized to obtain the balanced matrix of association frequency domain;

Utilize the balanced matrix of association frequency domain, association frequency domain equilibrium is carried out to the frequency-domain received signal of described user in all antenna channels filtered out, obtains frequency domain soft symbol;

IDFT time-frequency conversion is carried out to described frequency domain soft symbol and obtains time domain soft symbol;

Demodulation is carried out to described time domain soft symbol and obtains the soft bit of time domain;

The source bits that decoding obtains described user is carried out to the soft bit of time domain.

Preferably, utilize the application of installation of spaced antenna reception data in Long Term Evolution frequency division multiplexing LTEFDD system or be applied to Long Term Evolution time division multiplexing LTE TDD system.

Preferably, the device utilizing spaced antenna to receive data is specially the BBU of eNB, then each spaced antenna is each antenna of the multiple RRU be connected with BBU.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (16)

1. utilize spaced antenna to receive a method for data, it is characterized in that, comprising:

For same user, determine the received signal quality in each antenna channels;

Filter out the antenna channels that received signal quality meets setting requirement;

Frequency-domain received signal from described user in each antenna channels filtered out is processed, obtains the source bits from described user;

For same user, determine the received signal quality in each antenna channels, specifically comprise:

OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtains the frequency-domain received signal from same user in each antenna channels;

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Filter out the antenna channels that received signal quality meets setting requirement, specifically comprise:

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal; Or

Filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

2. the method for claim 1, is characterized in that, described setting modulus value/setting power value is determined in the following way:

Determine the maximum modulus value/maximum power value from the frequency-domain received signal of same user in each antenna channels;

Described maximum modulus value/maximum power value and setting coefficient product are obtained set modulus value/setting power value, set the factor be less than 1 positive number.

3. the method for claim 1, is characterized in that, processes, specifically comprise the frequency-domain received signal from described user in each antenna channels filtered out:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

The frequency domain soft symbol of all antenna channels filtered out is merged;

The frequency domain soft symbol obtained after being combined carries out IDFT time-frequency conversion and obtains time domain soft symbol;

Demodulation is carried out to time domain soft symbol, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

4. the method for claim 1, is characterized in that, processes, specifically comprise the frequency-domain received signal from described user in each antenna channels filtered out:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

IDFT time-frequency conversion is carried out to the frequency domain soft symbol of each antenna channels, obtains the time domain soft symbol of this antenna channels;

The time domain soft symbol of all antenna channels filtered out is merged;

The time domain soft symbol obtained after being combined carries out demodulation, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

5. the method for claim 1, is characterized in that, processes, specifically comprise the frequency-domain received signal from described user in each antenna channels filtered out:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

IDFT time-frequency conversion is carried out to the frequency domain soft symbol of each antenna channels, obtains the time domain soft symbol of this antenna channels;

The soft bit of time domain that demodulation obtains this antenna channels is carried out to the time domain soft symbol of each antenna channels;

The soft bit of the time domain of all antenna channels filtered out is merged, obtains the soft bit of time domain after merging;

The soft bit of time domain after being combined carries out decoding, obtains the source bits of described user.

6. the method as described in as arbitrary in claim 3 ~ 5, is characterized in that, utilize the channel response matrix of each antenna channels to obtain the frequency domain equalization matrix of this antenna channels, specifically comprise:

Utilize the channel response matrix of each antenna channels, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the frequency domain equalization matrix of this antenna channels.

7. the method for claim 1, is characterized in that, processes, specifically comprise the frequency-domain received signal from described user in each antenna channels filtered out:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of all antenna channels filtered out is utilized to obtain the balanced matrix of association frequency domain;

Utilize the balanced matrix of association frequency domain, association frequency domain equilibrium is carried out to the frequency-domain received signal of described user in all antenna channels filtered out, obtains frequency domain soft symbol;

IDFT time-frequency conversion is carried out to described frequency domain soft symbol and obtains time domain soft symbol;

Demodulation is carried out to described time domain soft symbol, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

8. method as claimed in claim 7, is characterized in that, utilizes the channel response matrix of all antenna channels filtered out to obtain the balanced matrix of association frequency domain, specifically comprises:

Utilize the channel response matrix of all antenna channels filtered out, adopt ZF ZF algorithm or least mean-square error MMSE algorithm, obtain the balanced matrix of association frequency domain.

9. as Claims 1 to 5,7,8 arbitrary as described in method, it is characterized in that, the method is applied to Long Term Evolution frequency division multiplexing LTEFDD system or is applied to Long Term Evolution time division multiplexing LTE TDD system.

10. utilize spaced antenna to receive a device for data, it is characterized in that, comprising:

Signal quality determining unit, for for same user, determines the received signal quality in each antenna channels;

Channel screen unit, meets the antenna channels of setting requirement for filtering out received signal quality;

Signal processing unit, for processing the frequency-domain received signal from described user in each antenna channels filtered out, obtains the source bits from described user;

Described signal quality determining unit, for same user, is determined the received signal quality in each antenna channels, is specifically comprised:

OFDM symbol demodulation is carried out to the time-domain received signal in each antenna channels, obtains the frequency-domain received signal from same user in each antenna channels;

Determine in each antenna channels from the modulus value of the frequency-domain received signal of same user or performance number;

Channel screen sieve unit selects the antenna channels that received signal quality meets setting requirement, specifically comprises:

Filter out the antenna channels of modulus value higher than setting modulus value of frequency-domain received signal; Or

Filter out the antenna channels of performance number higher than setting power value of frequency-domain received signal.

11. devices as claimed in claim 10, is characterized in that, described setting modulus value/setting power value that described channel screen unit uses is determined in the following way:

Determine the maximum modulus value/maximum power value from the frequency-domain received signal of same user in each antenna channels;

Described maximum modulus value/maximum power value and setting coefficient product are obtained set modulus value/setting power value, set the factor be less than 1 positive number.

12. devices as claimed in claim 10, it is characterized in that, signal processing unit processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

The frequency domain soft symbol of all antenna channels filtered out is merged;

The frequency domain soft symbol obtained after being combined carries out IDFT time-frequency conversion, obtains time domain soft symbol;

Demodulation is carried out to time domain soft symbol, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

13. devices as claimed in claim 10, it is characterized in that, signal processing unit processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

IDFT time-frequency conversion is carried out to the frequency domain soft symbol of each antenna channels, obtains the time domain soft symbol of this antenna channels;

The time domain soft symbol of all antenna channels filtered out is merged;

The time domain soft symbol obtained after being combined carries out demodulation, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

14. devices as claimed in claim 10, it is characterized in that, signal processing unit processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of each antenna channels is utilized to obtain the frequency domain equalization matrix of this antenna channels;

Utilize the frequency domain equalization matrix of each antenna channels, frequency domain equalization is carried out to the frequency-domain received signal of user described in this antenna channels, obtain the frequency domain soft symbol of this antenna channels;

IDFT time-frequency conversion is carried out to the frequency domain soft symbol of each antenna channels, obtains the time domain soft symbol of this antenna channels;

The soft bit of time domain that demodulation obtains this antenna channels is carried out to the time domain soft symbol of each antenna channels;

The soft bit of the time domain of all antenna channels filtered out is merged, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

15. devices as claimed in claim 10, it is characterized in that, signal processing unit processes the frequency-domain received signal from described user in each antenna channels filtered out, and specifically comprises:

Carry out channel estimating, the channel response matrix that each antenna channels obtaining filtering out is corresponding;

The channel response matrix of all antenna channels filtered out is utilized to obtain the balanced matrix of association frequency domain;

Utilize the balanced matrix of association frequency domain, association frequency domain equilibrium is carried out to the frequency-domain received signal of described user in all antenna channels filtered out, obtains frequency domain soft symbol;

IDFT time-frequency conversion is carried out to described frequency domain soft symbol and obtains time domain soft symbol;

Demodulation is carried out to described time domain soft symbol, obtains the soft bit of time domain;

Decoding is carried out to the soft bit of time domain, obtains the source bits of described user.

16. as arbitrary in claim 10 ~ 15 as described in device, it is characterized in that, utilize spaced antenna to receive the application of installation of data in Long Term Evolution frequency division multiplexing LTEFDD system or be applied to Long Term Evolution time division multiplexing LTE TDD system.