CN102142889A - Multi-base-station cooperative receiving method and communication system - Google Patents

Abstract

The embodiment of the invention provides a multi-base-station cooperative receiving method and a communication system. The method comprises the steps: each base station receives a signal of a terminal; a processing base station receives signals of the terminal, received by other base stations, through an interactive link between the processing base station and the other base stations; the processing base station merges the signal of the terminal, received by per se, with the signals of the terminal, received by the other base stations; and the processing base station judges and decodes the merged signals and sends the merged signals to the base station of a cell where the terminal is in. In the method and the system provided by the invention, each base station receives the signal of the terminal, and the processing base station converges the signals received by all base stations so that multi-base-station cooperative receiving is formed, therefore, the reliability of link communication is improved, and hardware cost increase of the system is effectively lowered because hardware equipment needs not to be singly increased in each base station.

Description

Collaborative method of reseptance in a kind of many base stations and communication system

Technical field

The invention belongs to wireless communication technology field, relate in particular to a kind of.

Background technology

Wireless communication technology is the technology that a kind of characteristic of utilizing electromagnetic wave signal to propagate in free space is carried out message transmission.Be radiated in the space by the signal of telecommunication of an electromagnetic radiation device at transmitting terminal beared information, receiving terminal by an electromagnetic coupling device with the space in the electromagnetic wave of beared information receive and convert to the signal of telecommunication.By means of wireless communication technology, make transmitter and receiver freely to lay, and can transmission in moving.

But because electromagnetic wave energy in transmission course own has decay, so the spacing distance of transmitter and receiver is very limited.In order to address this problem, subregion need be carried out in the space, other communication nodes (being commonly referred to terminal) that are provided with in each zone in a transmitting-receiving node (being deployed as the base station usually) and this zone communicate.By means of the base station, can be so that remote two terminals can be carried out information communication.And by increasing the number of base sites, the communication range of terminal extension that can be unlimited.

In the urban area circumstance of complexity, because high building is more, the link attenuation when blocked by high building is bigger, and has the link attenuation when looking at the path straight less between terminal and base station, therefore the link attenuation meeting acute variation when terminal is mobile between building.This situation may cause the frequent variation in base station that communicates with this terminal, and switch the sub-district of carrying out that promptly terminal is frequent, perhaps causes the communication link instability between terminal and the base station.

For addressing the above problem, a solution is proposed in the prior art, promptly in the base station, increase many group of received antenna and radio frequency processing link, make up the classification receiving system.A plurality of reception antennas receive the signal of self terminal simultaneously, and the receiver of base station merges the signal of a plurality of reception antennas receptions of this base station, thereby effectively improve the reliability of link communication.But this scheme need additionally increase many group of received antenna and radio frequency processing link in each base station, thereby has increased the hardware cost of system significantly.

Summary of the invention

In view of this, the object of the present invention is to provide collaborative method of reseptance in a kind of many base stations and communication system, can under the prerequisite of the reliability that improves communication link, reduce the increase of system hardware cost.

For achieving the above object, one embodiment of the present of invention provide a kind of many base stations to work in coordination with method of reseptance, comprising:

The signal of each base station receiving terminal;

Processing base station wherein by and other base stations between interactive link receive the signal of the terminal that other base stations receive;

The terminal signaling that the terminal signaling that described processing base station receives self and other base stations receive merges;

After adjudicating and decipher processing, signal after the processing base station is combined is sent in the base station of this sub-district, terminal place.

Preferably, the terminal signaling that receives of described processing base station terminal signaling that self is received and other base stations merges and comprises:

The channel response parameter of each base station of time-domain sampling calculated signals that described processing base station receives at each base station, and determine the weighted factor of respective base station by the channel response parameter, by weighted factor the terminal signaling of handling the base station and receiving is weighted merging.

Preferably, the channel response parameter specific implementation of each base station of time-domain sampling calculated signals of receiving at each base station, described processing base station is:

Handle i the symbol time-domain sampling signal y that the base station receives t base station _i(n) utilize following formula to convert frequency domain mark Y to _i(k)

$Y_i\left(k\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}{y}_i\left(n\right)e^{-j2\mathrm{\πnk}/N}$

Wherein, k is the subcarrier sequence number, and k ∈ [0, N-1], N are the time-domain sampling point that symbol a comprised sum, and n is symbol time-domain sampling point sequence number.

And obtain the channel response parameter of t base station by following formula:

Wherein,

Be the pilot frequency information on k the received subcarrier of t base station, P (k) is institute's pilot transmitted information on k the subcarrier.

Preferably, describedly determine that by the channel response parameter weighted factor specific implementation of respective base station is:

Calculate the channel response parameter of t base station by following formula:

Wherein, T is the quantity of all base stations.

Preferably, the described terminal signaling of handling the base station and receiving being weighted by weighted factor merges specific implementation and is:

Calculate the weighting amalgamation result by following formula:

$S\left(k\right)=\underset{t=0}{\overset{T-1}{\mathrm{\Σ}}}{G}_i^t\left(k\right)Y_i^t\left(k\right)$

Preferably, also comprise: from all base stations, dispose one in advance and handle the base station.

On the other hand, the present invention also provides a kind of communication system, comprises a plurality of base stations, and one of them base station is as handling base station, the signal of each base station receiving terminal;

Described processing base station be used for by and other base stations between interactive link receive the signal of the terminal that other base stations receive; And the terminal signaling that self is received merges with the terminal signaling that other base stations receive; Signal after being combined is sent in the base station of this sub-district, terminal place after adjudicating and decipher processing.

The method and system that the embodiment of the invention provides, each base station is the signal of receiving terminal all, handling the base station converges the signal that each base station receives, form the collaborative reception in many base stations, thereby improve the reliability of link communication, simultaneously need not increase hardware device separately in each base station, the hardware cost that effectively reduces system increases.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the flow chart of many base station systems method of reseptance provided by the invention;

Fig. 2 is the flow chart of an embodiment of the collaborative method of reseptance in many base stations among the present invention;

Fig. 3 is a kind of network architecture schematic diagram that embodiment was suitable among Fig. 2.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

In the present invention, between each base station, carry out information interaction, the signal gathering of the same terminal that the base station that will close on is received carries out associated treatment to same base station, thereby form the collaborative network architecture that receives same end message of a multi-site, thereby can not increase the reliability that improves the message transmission link under the hardware devices circumstances in base station own.

As shown in Figure 1, many base station systems method of reseptance provided by the invention comprises the steps:

Step S101: the signal of the independent receiving terminal in each base station (comprise and handle the base station);

Step S102: processing base station wherein by and other base stations between interactive link receive the signal of the terminal that other base stations receive;

Step S103: handle base station terminal signaling that self is received and the terminal signaling that other base stations receive and merge;

Here handling terminal signaling that base station self receives is meant and handles the signal that the base station directly receives from terminal.

Step S104: be sent in the base station of this sub-district, terminal place after processing is adjudicated and deciphered to the signal after the processing base station is combined.

It will be apparent to those skilled in the art that in the present existing communication system that general selective reception is handled signal to the strongest base station of signal, and with the result conduct of this base station to judgement that terminal transmitted.And each base station all participates in the signal that receiving terminal sends in the collaborative method that receives in many base stations provided by the invention, and one of them base station deployment is the processing base station, gather the signal that other base stations receive in the lump this processing base station, form the collaborative reception in many base stations, thereby the insecure problem of message transmission that overcomes the quick variation of channel fading in the application that complex environment and terminal move and cause, and then improve the reliability of link communication.Owing to need in each base station, not increase other hardware devices such as many group antennas separately, so method provided by the invention can effectively reduce the increase of the hardware cost of system.

In practice, handling method that the base station merges the signal of the same terminal that receives from other base stations can have a variety ofly, for example adopts processing methods such as high specific merging, equal gain combining.Two kinds of merging modes are compared, and the high specific merging has more excellent performance, but it is high slightly to handle complexity.Below describe in detail with a specific embodiment that adopts high specific to merge.

Fig. 2 shows the flow chart of an embodiment of the collaborative method of reseptance in many base stations among the present invention; Fig. 3 is a kind of network architecture schematic diagram that this embodiment is suitable for.

As shown in Figure 3, be three schematically in the present embodiment with base station sets, be respectively base station 1, base station 2 and base station 3, and be that example specifies with a terminal.In the present embodiment, in advance base station 1 is deployed as the processing base station.

As shown in Figure 2, the method in the present embodiment comprises:

Step S201: all base stations (comprising base station 1, base station 2 and base station 3) receive the signal that is sent by terminal.

Radio demodulating processing and digital synchronous are carried out to the terminal signaling that receives independently in each base station, also will carry out the multicarrier demodulation process in multicarrier modulation system.

Step S202: other each base stations beyond the processing base station are arrived the signal of institute's demodulation in the processing base station (base station 1) by the signal gathering of the information interaction link between the base station with received terminal;

Handle the base station and receiving from will carrying out channel estimating after other each signal of base station, so that know the channel status between each base station and the terminal, specific as follows:

Step S203: the channel response parameter of handling each base station of time-domain sampling calculated signals that the base station receives at each base station.

Specific implementation is to handle i the symbol time-domain sampling signal that the base station receives t base station

Utilize following formula to convert the frequency domain mark to

$Y_i^t\left(k\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}{y}_i^t\left(n\right)e^{-j2\mathrm{\πnk}/N}$ (formula 1)

Wherein, k is the subcarrier sequence number, and k ∈ [0, N-1], N are the time-domain sampling point that symbol a comprised sum, and n is symbol time-domain sampling point sequence number.

Can extract pilot signal from the signal that receives in the process of channel estimating, this pilot signal that receives and pilot transmitted signal are carried out channel estimating based on the LS criterion, channel estimating can be described as:

(formula 2)

Wherein, Be the pilot frequency information on k the received subcarrier of t base station, P (k) is institute's pilot transmitted information on k the subcarrier.

Mode by linear interpolation obtains the channel response on all data subcarriers then, and interpolation is handled and can be undertaken by the mode of first-order linear interpolation, for example can adopt following formula to carry out:

(formula 3)

Wherein, k ₁＜k＜k ₂Here obtain

Be designated as the channel response parameter.

Step S204: handle respective base station is determined in the base station by the channel response parameter weighted factor.

T base station can adopt following formula to determine to the weighted factor of i signal:

(formula 4)

Step S205: the processing base station is weighted merging by the signal of the terminal that the weighted factor that calculates among the step S204 converges from each base station.

The process that weighting merges can adopt following formula to realize:

$S\left(k\right)=\underset{t=0}{\overset{T-1}{\mathrm{\Σ}}}{G}_i^t\left(k\right)Y_i^t\left(k\right)$ (formula 5)

Wherein, T is the quantity of the collaborative base station that receives, and the collaborative here base station that receives comprises that processing base station and other terminal signalings that oneself is received converge to the base station of handling the base station.In the network architecture shown in Fig. 3, T equals 3.

Step S206: processing is adjudicated and deciphered to the signal of handling after the base station is combined, and forward it in the base station of sub-district, terminal place.

In addition, the present invention also correspondingly provides a kind of communication system, and this system comprises a plurality of base stations, and one of them base station is as handling base station, the signal of each base station independence receiving terminal.

Handle the base station by and other base stations between interactive link receive the terminal signaling that other base stations receive and merge, and the signal after being combined is sent in the base station of this sub-district, terminal place after adjudicating and decipher processing.

The detailed process that in the above-mentioned processing base station terminal signaling is merged can be above-mentioned about among the embodiment of the collaborative method of reseptance in many base stations about handling the execution in step of base station.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (7)

1. the collaborative method of reseptance in base station more than a kind is characterized in that, comprising:

The signal of each base station receiving terminal;

Processing base station wherein by and other base stations between interactive link receive the signal of the terminal that other base stations receive;

The terminal signaling that the terminal signaling that described processing base station receives self and other base stations receive merges;

After adjudicating and decipher processing, signal after the processing base station is combined is sent in the base station of this sub-district, terminal place.

2. method according to claim 1 is characterized in that, the terminal signaling that the terminal signaling that described processing base station receives self and other base stations receive merges and comprises:

The channel response parameter of each base station of time-domain sampling calculated signals that described processing base station receives at each base station, and determine the weighted factor of respective base station by the channel response parameter, by weighted factor the terminal signaling of handling the base station and receiving is weighted merging.

3. method according to claim 2 is characterized in that, described processing base station at the channel response parameter specific implementation of each base station of time-domain sampling calculated signals that each base station receives is:

Handle i the symbol time-domain sampling signal y that the base station receives t base station _i(n) utilize following formula to convert frequency domain mark Y to _i(k)

$Y_i\left(k\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}{y}_i\left(n\right)e^{-j2\mathrm{\πnk}/N}$

Wherein, k is the subcarrier sequence number, and k ∈ [0, N-1], N are the time-domain sampling point that symbol a comprised sum, and n is symbol time-domain sampling point sequence number;

And obtain the channel response parameter of t base station by following formula:

Wherein,

Be the pilot frequency information on k the received subcarrier of t base station, P (k) is institute's pilot transmitted information on k the subcarrier.

4. method according to claim 3 is characterized in that, describedly determines that by the channel response parameter weighted factor specific implementation of respective base station is:

Calculate the channel response parameter of t base station by following formula:

Wherein, T is the quantity of all base stations.

5. method according to claim 4 is characterized in that, the described terminal signaling that the processing base station is received by weighted factor is weighted the merging specific implementation and is:

Calculate the weighting amalgamation result by following formula:

$S\left(k\right)=\underset{t=0}{\overset{T-1}{\mathrm{\Σ}}}{G}_i^t\left(k\right)Y_i^t\left(k\right)$

6. according to any described method in the claim 1 to 5, it is characterized in that, also comprise: from all base stations, dispose one in advance and handle the base station.

7. a communication system is characterized in that, comprises a plurality of base stations, and one of them base station is as handling base station, the signal of each base station receiving terminal;

Described processing base station be used for by and other base stations between interactive link receive the signal of the terminal that other base stations receive; And the terminal signaling that self is received merges with the terminal signaling that other base stations receive; Signal after being combined is sent in the base station of this sub-district, terminal place after adjudicating and decipher processing.

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