CN201312315Y

CN201312315Y - System, emitting device and receiving device for eliminating interference close to base station

Info

Publication number: CN201312315Y
Application number: CNU2008201225549U
Authority: CN
Inventors: 王智
Original assignee: Individual
Current assignee: DALIAN HILANDWE COMMUNICATION Co Ltd
Priority date: 2008-09-18
Filing date: 2008-09-18
Publication date: 2009-09-16
Anticipated expiration: 2018-09-18

Abstract

The utility model discloses a system, an emitting device and a receiving device for eliminating interference close to a base station. The system comprises the emitting device and the receiving device, wherein the emitting device comprises a grouping module, an interleaving module, a repeating module, a permutation module and an emitting module; the receiving device comprises a receiving module, a data inverse permutation module, a data de-interleaving module, a channel estimation module, an equilibrium module and a merge module, wherein the channel estimation module comprises a physical channel estimation unit, a channel inverse permutation module, a channel de-interleaving unit, an estimation logic matrix construction unit and a weighting coefficient calculating unit. The utility model eliminates the interference close to the base station in a communication system and lowers the error rate.

Description

System, transmitting device and receiving device for eliminating interference of adjacent base stations

Technical Field

The utility model relates to a radio communication field especially relates to a system, transmission, receiving arrangement that eliminate and close on basic station interference.

Background

The Worldwide Interoperability for microwave access (WiMAX) standard generally employs a Code Repetition (Code Repetition) technique to improve signal-to-noise Ratio characteristics, and employs a Maximum Ratio Combining (MRC) technique to synthesize repeated symbols in a receiver to reduce a Packet Error Rate (PER) and a Bit Error Rate (BER). It is well known that the maximal ratio synthesis technique is the best synthesis technique to eliminate Additive White Gaussian Noise (AWGN). However, at the edge of the cell covered by the base station, the interference of the adjacent base station is very strong and belongs to the narrowband interference completely different from the additive white gaussian noise. In this case, the maximal ratio combining technique cannot obtain satisfactory packet error rate and bit error rate.

Fig. 1 is a schematic diagram of a base station coverage unit interfered by adjacent base stations in the prior art, in fig. 1, each hexagon indicates a base station coverage unit, and the center of each hexagon is the location of the base station, wherein a triangular area belongs to the handover area of every three base station coverage units, for example, a mobile terminal belonging to the central base station coverage unit 1 in the handover areas of the

base stations

1, 2, 3 is subjected to strong interference signals from the

base stations

2, 3. The rectangular area belongs to the handover area of two base stations, e.g. a mobile terminal belonging to the central base station coverage unit 1 in the handover area of

base stations

1, 2 is subject to strong interference signals from base station 2.

Fig. 2 is a sector distribution diagram of a base station coverage unit 1 in the prior art, and in fig. 2, the base station coverage unit 1 includes a first sector 101, a second sector 102, and a third sector 103.

FIG. 3 shows frequency reuse as 1/3/1 signal-to-interference ratio (S)IR, signaltonterferenceratio), in the maximum ratio combining technique, the frequency reuse of 1/3/1 means that a base station includes three sectors, and the three sectors share a frequency band. In FIG. 3, a base station coverage unit r is included₀、r₁、r₂、r₃、r₄、r₅. Wherein, the base station covering unit r₀As a central base station covering unit, at a base station covering unit r₀At the o point position of (a), there is a coverage unit r from the base station₁、r₂And interference signals from base station coverage unit r₃、r₄、r₅Is an interference signal. The total strength of these interfering signals is-8.9807 dB.

Fig. 4 is a schematic diagram of a result of performance simulation by using a maximum ratio synthesis technique with frequency reuse of 1/3/1, in fig. 4, the ordinate is packet error rate, the abscissa is signal-to-noise ratio, and the simulation environment is set as follows:

downlink: partial Usage Of subchannel configuration (PUSC);

modulation mode: quadrature Phase Shift Keying (QPSK);

coding rate: 1/2, respectively;

data block size: 100 bytes;

interference of adjacent base stations: the signal-to-interference ratio is divided into 0dB of interference of a first adjacent base station, and the signal-to-interference ratio is divided into 10dB of interference of a second adjacent base station;

communication channel: ITU Ped-B (3 km/h);

the synthesis technology adopted by the receiving end is as follows: maximum ratio synthesis techniques;

the channel estimation method comprises the following steps: ideal channel estimation.

The three simulation curves A, B, C in fig. 4 are simulation results for different simulation conditions, wherein,

the simulation conditions for curve a are:

code repetition rate: 4;

the antenna structure is as follows: single Input Single Output (SISO), i.e. 1 transmitting antenna and 1 receiving antenna;

the simulation conditions for curve B are:

code repetition rate: 6;

the simulation conditions for curve C are:

code repetition rate: 4;

the antenna structure is as follows: single Input Multiple Output (SIMO) 1x2, i.e. 1 transmit antenna and 2 receive antennas.

In the maximum ratio combining technique, the frequency reuse of 1/3/1 means that a base station includes three sectors, and the three sectors share a frequency band. In this case, since the three sectors share the same frequency band, the frequency resource utilization rate is higher, but there is a serious interference problem, especially interference of an adjacent base station, and since the interference of the adjacent base station is narrowband noise interference, the interference problem of the adjacent base station cannot be solved well by the existing code repetition technology, maximum ratio combining technology and Hybrid Automatic Repeat Request (HARQ) technology.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an eliminate system, transmission, receiving arrangement who closes on basic station interference reaches and eliminates and closes on basic station interference, when improving communication system's reliability, the most effectual resource utilization who improves communication system to reduce packet error rate and error rate.

According to the utility model discloses an aspect provides a system for eliminate and close on basic station interference, includes:

the transmitting device is used for grouping, interleaving and repeatedly generating the logic data blocks for the initial data blocks, arranging the logic data blocks to generate the physical data blocks and sending the physical data blocks in a preset mode;

a receiving device, configured to receive a physical data block in a predetermined manner, perform inverse arrangement and deinterleave on the physical data block to obtain a deinterleaved logical data block, separate and estimate physical channels of a target base station and an adjacent base station through a preamble symbol or a pilot symbol, perform inverse arrangement and deinterleave on the estimated physical channel to obtain an estimated logical channel, construct an estimated logical channel matrix through the estimated logical channel, calculate a weighting coefficient according to the estimated logical channel matrix, balance the deinterleaved logical data block by using the weighting coefficient to obtain a balanced logical data block, and restore the balanced logical data block to obtain an initial data block; wherein,

the physical channel of the target base station is a physical channel from the target base station to the receiving device; the physical channel of the adjacent base station is a physical channel from the adjacent base station to the receiving device.

According to a feature of the embodiment of the present invention, the transmitting device includes:

the grouping module is used for grouping the initial data blocks to generate grouped logic data blocks;

the interleaving module is used for interleaving the grouped logic data blocks to generate interleaved logic data blocks;

the repeating module is used for repeating the interleaved logic data blocks to generate repeated logic data blocks;

the arrangement module is used for arranging the repeated logic data blocks to generate arranged physical data blocks;

and the transmitting module is used for transmitting the arranged physical data blocks in a preset mode.

According to another feature of an embodiment of the present invention, the receiving device includes:

and the receiving module is used for receiving the physical data block in a predetermined mode.

The reverse arrangement module is used for performing reverse arrangement on the received physical data blocks to obtain logic data blocks after the reverse arrangement;

the de-interleaving module is used for de-interleaving the logic data blocks after the reverse arrangement to obtain the logic data blocks after de-interleaving;

the channel estimation module is used for separating and estimating physical channels of the target base station and the adjacent base station according to the received pilot symbols or pilot symbols; carrying out inverse permutation on the estimated physical channel to obtain an estimated logical channel after the inverse permutation; de-interleaving the inversely arranged estimated logical channels to obtain de-interleaved estimated logical channels; constructing an estimated logical channel matrix according to the estimated logical channel after de-interleaving; calculating a weighting coefficient according to the estimated logical channel matrix;

the equalization module is used for carrying out equalization processing on the logic data block after de-interleaving by utilizing the weighting coefficient to obtain an equalized logic data block;

and the restoring module is used for restoring the balanced logic data block to obtain an initial data block.

According to another feature of an embodiment of the present invention, the channel estimation module includes:

a physical channel estimation unit, configured to separate and estimate physical channels of the target base station and the neighboring base stations according to the received preamble symbol or pilot symbol;

the channel reverse arrangement unit is used for performing reverse arrangement on the estimated physical channel to obtain an estimated logical channel after the reverse arrangement;

a channel deinterleaving unit, configured to deinterleave the inversely arranged estimated logical channels to obtain deinterleaved estimated logical channels;

a construct estimation logical channel matrix unit for constructing an estimated logical channel matrix according to the deinterleaved estimated logical channel;

and a weight coefficient calculating unit for calculating a weight coefficient based on the estimated logical channel matrix.

According to a feature of an embodiment of the present invention, grouping, interleaving, repeatedly generating the logical data blocks to the initial data blocks includes:

and grouping, repeating and interleaving the initial data block to generate a logic data block.

According to another feature of an embodiment of the present invention, the generating the logical data block by repeating and interleaving the initial data block includes:

repeating the grouped data blocks to generate a plurality of repeated data blocks;

and interleaving the repeated data blocks by adopting different interleaving methods to generate a logic data block.

According to a further feature of an embodiment of the present invention, the arranging the data and the inverse arranging the data are inverse processes corresponding to each other;

the interleaving of the data and the de-interleaving of the data are inverse processes corresponding to each other.

According to another feature of an embodiment of the present invention,

the predetermined mode is a wired communication mode or a wireless communication mode.

According to another feature of an embodiment of the present invention,

the estimated logical channel matrix is a full rank matrix.

According to the utility model discloses another aspect provides an eliminate emitter that closes on basic station interference, include:

the arrangement module is used for arranging the repeated data blocks to generate arranged physical data blocks;

the repeating module is used for repeating the grouped logic data blocks to generate repeated logic data blocks;

the interleaving module is used for interleaving the repeated logic data blocks to generate interleaved logic data blocks;

the arrangement module is used for arranging the interleaved data blocks to generate arranged physical data blocks;

According to the utility model discloses another aspect provides an eliminate receiving arrangement who closes on basic station interference, include:

the channel estimation module is used for separating and estimating physical channels of the target base station and the adjacent base station according to the received pilot symbols or pilot symbols; carrying out inverse permutation on the estimated physical channel to obtain an estimated logical channel after the inverse permutation; de-interleaving the inversely arranged estimated logical channels to obtain de-interleaved estimated logical channels; constructing an estimated logical channel matrix according to the estimated logical channel after de-interleaving; calculating a weighting coefficient according to the estimated logical channel matrix; wherein, the physical channel of the target base station is the physical channel from the target base station to the receiving device; the physical channel of the adjacent base station is a physical channel from the adjacent base station to the receiving device.

The equalization module is used for carrying out equalization processing on the logic data block after de-interleaving by using the weighting coefficient to obtain the equalized logic data block;

According to a feature of an embodiment of the present invention, the channel estimation module includes:

and the weight coefficient calculating unit is used for calculating weight coefficients according to the estimated logic channel matrix.

Eliminate system that closes on basic station interference, transmission, receiving arrangement, through grouping initial data piece at the transmission part, interweave, it is repeated, arrange, separate and estimate target base station and the physical channel who closes on the basic station according to leading symbol or pilot frequency symbol at the receiving part, carry out the inverse permutation to the data piece received, deinterleave, it is balanced, restore, reach and eliminate the interference of closing on the basic station under the various frequency reuse rate, thereby target base station cover marginal error package rate and bit error rate have been reduced by a wide margin, and when improving communication system's reliability, most effectual improvement communication system's resource utilization rate.

Drawings

FIG. 1 is a diagram illustrating a base station coverage unit interfered by neighboring base stations in the prior art;

fig. 2 is a sector distribution diagram of a base station coverage unit 1 in the prior art;

fig. 3 is a schematic diagram of a base station coverage unit with frequency reuse of 1/3/1 signal-to-interference ratio worst;

FIG. 4 is a graph showing the results of a performance simulation using a maximum ratio synthesis technique with frequency reuse of 1/3/1;

fig. 5 is a block diagram of a system for eliminating interference from neighboring base stations according to an embodiment of the present invention;

fig. 6 is a flow chart of a method for eliminating interference from neighboring base stations according to an embodiment of the present invention;

fig. 7 is a schematic diagram comparing simulation results of the present invention and the prior art under the condition that two adjacent base station interferences are respectively 0dB and 10 dB.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 5 is a block diagram of a system for eliminating interference from nearby base stations according to an embodiment of the present invention, which includes two parts, a transmitting device 50 and a receiving device 51, wherein,

the transmitting apparatus 50 includes a grouping module 501, an interleaving module 502, a repeating module 503, a arranging module 504, and a transmitting module 505. Wherein,

a grouping module 501 for grouping the initial data block S_Org ^kGrouping the data into groups to generate grouped logic data blocks S_{Org_j} ^k. Wherein the initial data block S_Org ^kEither coded and modulated or not. S_Org ^k、S_{Org_j} ^kK is a base station identity, e.g., when k is 1, S_Org ¹An initial data block representing a first base station; s_{Org_j} ^kJ of (a) is an identifier of a logical subcarrier, e.g., when j is 1, S_{Org_1} ^kRepresenting logical data carried by the first logical subcarrier in the logical data block.

A logical Data Block (Logic Data Block) is a Data Block in which Information codes (Information bits) for transferring a Media Access Control (MAC) layer to a physical layer are reassembled at an appropriate place of the physical layer. Wherein, the information code is the initial data block. The size of a logical data block is typically determined by the number of subcarriers and the number of repetitions within each data symbol. Here and below, if not specifically stated, the data symbols are Orthogonal Frequency Division Multiplexing (OFDM) data symbols. For example, in an OFMD data symbol of 1024FFT, if the number of subcarriers is 840 and the repetition rate is 3, the size of the logical data block is 280 subcarriers; if the number of subcarriers is 720 and the repetition rate is 3, the size of the logical data block is 240 subcarriers. The data in the logical data block can adopt different coding methods and different modulation modes.

The grouped logical Data block may include a plurality of Data Packets (Data Packets), or one Data packet may be divided into a plurality of Data blocks. A data packet is a block of data that is transported from the mac layer to the physical layer in a wireless communication system and includes data information, e.g., voice, image, etc., and related control information. The definition of the data packet is determined by the medium access control layer.

An interleaving module 502 for interleaving the grouped logical data block S_{Org_j} ^kInterleaving to generate interleaved logic data block S_i ^k. As shown in equation (1):

S_{i}^{k} = f_{Inter} (S_{Org_j}^{k}) - - - (1)

in the formula (1), f_Inter() Is an interleaving function.

A repeating module 503 for repeating the interleaved logical data block S_i ^kRepeating to generate a repeated logic data block X_i ^k. As shown in equation (2):

s on the right side of equation (2)_i+M ^k、S_i+2M ^k、...、S_i+(N-1)M ^kRepresentation and logical data block S_i ^kThe same logical data block.

The repetition module 503 repeats the logical data blocks in a predetermined manner. The size and the number of repetitions of the logical data block for each base station are kept consistent. In general, the size and number of repetitions of the FFT determines the size of the logical data block. For example, for a three sector cellular network, the repetition is typically twice within an OFDM symbol, i.e., the size of the logical Data block is one third of the number of Data Subcarriers (Data Subcarriers). Of course, the number of repetitions may be selected differently depending on the network distribution and the number of base station sectors.

Interleaving the grouped logical data blocks by the interleaving module 502 is actually reordering the logical subcarriers in the grouped logical data blocks. The interleaving process of the logical data blocks may be performed after the grouping process or after the repeating process. If the logical data blocks are interleaved after the repeating process, each repeated logical data block needs to be interleaved, and each repeated logical data block can be interleaved by adopting a different interleaving method.

The interleaving module 502 and the repeating module 503 can be exchanged, that is, the repeating module 503 first groups the grouped logical data block S_{Org_j} ^kRepeating the steps to generate a repeated data block X'_i ^k. As shown in equation (3):

s on the right side of equation (3)_{Org_j+M} ^k、S_{Org_j+2M} ^k、...、S_{Org_j+(N-1)M} ^kRepresentation and logical data block S_{Org_j} ^kThe same logical data block.

The repeated logical data blocks are then interleaved by the interleaving module 502 to generate interleaved logical data blocks S'_i ^k. As shown in equation (4):

<math> <mrow> <msubsup> <mi>S</mi> <mi>i</mi> <mrow> <mo>′</mo> <mi>k</mi> </mrow> </msubsup> <mo>=</mo> <msup> <mrow> <mo>[</mo> <msub> <mi>f</mi> <mrow> <mi>Inter</mi> <mo>_</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mi>S</mi> <mrow> <mi>Org</mi> <mo>_</mo> <mi>j</mi> </mrow> <mi>k</mi> </msubsup> <mo>)</mo> </mrow> <msub> <mi>f</mi> <mrow> <mi>Inter</mi> <mo>_</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mi>S</mi> <mrow> <mi>Org</mi> <mo>_</mo> <mi>j</mi> <mo>+</mo> <mi>M</mi> </mrow> <mi>k</mi> </msubsup> <mo>)</mo> </mrow> <msub> <mi>f</mi> <mrow> <mi>Inter</mi> <mo>_</mo> <mn>3</mn> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mi>S</mi> <mrow> <mi>Org</mi> <mo>_</mo> <mi>j</mi> <mo>+</mo> <mn>2</mn> <mi>M</mi> </mrow> <mi>k</mi> </msubsup> <mo>)</mo> </mrow> <mo>·</mo> <mo>·</mo> <mo>·</mo> <msub> <mi>f</mi> <mrow> <mi>Inter</mi> <mo>_</mo> <mi>N</mi> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mi>S</mi> <mrow> <mi>Org</mi> <mo>_</mo> <mi>j</mi> <mo>+</mo> <mrow> <mo>(</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> <mi>M</mi> </mrow> <mi>k</mi> </msubsup> <mo>)</mo> </mrow> <mo>]</mo> </mrow> <mi>T</mi> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow> </math>

in the formula (4), f_{Inter_i}() (i ═ 1, 2, … N) denotes logical data block X 'after repetition'_i ^kRespectively adopt differentInterleavers, e.g. interleaver f_{Inter_1}()、f_{Inter_2}()、...、f_{Inter_i}(). M represents the size of the data block and also represents the number of logical subcarriers used to carry the data block.

The interleaving method adopted by the interleaving module 502 is a row-column element permutation method, as shown in formula (5):

in equation (5), the size M of the logical data block is equal to the product of N and P in the input and output sequences.

If the repeated logical data blocks are interleaved, the rows and columns of the interleaving matrix may be different.

An arranging module 504 for arranging the repeated data blocks X_i ^kArranging to generate arranged physical data blockWherein the arranging module 504 arranges the repeated data block X_i ^kIs converted into a physical order, that is, the repeated logical data block X is converted into a physical order_i ^kConversion into permuted physical data blocks

As shown in equation (6):

X_{i_{PHY}}^{k} = f_{Permut} (X_{i}^{k}) - - - (6)

in the formula (6), f_Permut() Is a permutation function.

In order to ensure that the corresponding logical channels between the repeated logical data blocks maintain relative independence, the permutation may be random interleaving covering all data subcarriers, or may be an existing permutation method. For example, the part used in WiMAX uses an arrangement method such as secondary channel configuration PUSC, Advanced Modulation Coding (AMC). In general, there may be different permutation methods for data blocks of different base stations.

A transmitting module 505 for arranging the physical data blocks in a predetermined manner

And (5) sending.

The receiving apparatus 51 is described in detail below, and the receiving apparatus 51 includes a receiving module 511, a data inverse permutation module 512, a data de-interleaving module 513, a channel estimation module 514, an equalization module 515, and a combining module 516. Wherein,

a receiving module 511, configured to receive the physical data block sent by the transmitting module 505 in a predetermined manner

As shown in equation (7):

in formula (7), l represents the name of the receiving antenna;

is the physical channel from the kth base station to the l-th receive antenna;

is a physical data block arranged in the transmitting apparatus 50;

is additive white gaussian noise.

A data inverse arrangement module 512 for receiving the physical data block

Inverse arrangement is carried out to obtain a logic data block Z_{DP_i} ^l. As shown in equation (8):

Z_{DP_i}^{l} = f_{DE - Permut} (Z_{i_{PHY}}^{l}) - - - (8)

in the formula (8), f_DE-Permut() Is an inverse permutation function.

A data de-interleaving module 513 for de-interleaving the logical data block Z_{DP_i} ^lDe-interleaving to obtain a de-interleaved logic data block Z_i ^l. As shown in formulas (9) and (10):

Z_{i}^{l} = f_{DE_Inter} (Z_{DP_n}^{l}) - - - (9)

in formula (9), f_{DE_Inter}() Is a de-interleaving function.

The right side of equation (10) is the logical data block vector after deinterleaving.

And a channel estimation module 514, configured to estimate a physical channel and perform matching processing on the estimated physical channel. The channel estimation may be a time domain estimation or a frequency domain estimation of the physical channel. The matching process is to transform the estimated physical channel according to the received physical data symbols, so that the transformed estimated physical channel completely corresponds to the physical data symbols. For example, the physical data symbol includes 1024 subcarriers, and if the time domain estimation method is used to obtain the physical channel estimated in the time domain, the FFT transformation needs to be performed on the physical channel estimated in the time domain to obtain the physical channel estimated in the frequency domain. If the number of subcarriers in the frequency domain does not correspond, Interpolation and smoothing (Interpolation and smoothing) or decimation (subtraction) processing, or other corresponding processing, is required to be performed on the estimated physical channel.

The channel estimation module 514 includes: a physical channel estimation unit 5141, a channel inverse permutation unit 5142, a channel deinterleaving unit 5143, a constructed estimated logical channel matrix unit 5144, and a weight coefficient calculation unit 5145, wherein,

physical channel estimation unit 5141 for separating and estimating physical channel based on received preamble symbol or pilot symbol

The preamble symbol or pilot symbol has a function of separating a plurality of adjacent base stations from the same mobile communication terminal channel. Therefore, the channels of the target base station and the adjacent base stations can be separated through the pilot symbols or the pilot symbols, wherein the physical channel of the target base station is the physical channel from the target base station to the mobile communication terminal; the physical channel of the neighboring base station is a physical channel from the neighboring base station to the mobile communication terminal. The preamble symbols or pilot symbols may be symbols of an OFDM data type, or may be symbols of other data types. The physical channels from different base stations are separated and estimated using preamble symbols or pilot symbols.

A channel inverse permutation unit 5142, which performs inverse permutation on the estimated physical channel to obtain an estimated logical channel

As shown in formula (11):

<math> <mrow> <msubsup> <mover> <mi>Ψ</mi> <mo>^</mo> </mover> <mrow> <mi>DP</mi> <mo>_</mo> <mi>i</mi> </mrow> <mi>lk</mi> </msubsup> <mo>=</mo> <msub> <mi>f</mi> <mrow> <mi>DE</mi> <mo>-</mo> <mi>Permut</mi> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mover> <mi>Ψ</mi> <mo>^</mo> </mover> <msub> <mi>i</mi> <mi>PHY</mi> </msub> <mi>lk</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>11</mn> <mo>)</mo> </mrow> </mrow> </math>

in formula (11), f_DE-Permut() Is an inverse permutation function.

A channel deinterleaving unit 5143 for the estimated logical channel

De-interleaving to obtain the estimated logic channel after de-interleaving

As shown in equations (12) and (13):

<math> <mrow> <msubsup> <mover> <mi>Ψ</mi> <mo>^</mo> </mover> <mi>i</mi> <mi>lk</mi> </msubsup> <mo>=</mo> <msub> <mi>f</mi> <mrow> <mi>DE</mi> <mo>_</mo> <mi>Inter</mi> </mrow> </msub> <mrow> <mo>(</mo> <msubsup> <mover> <mi>Ψ</mi> <mo>^</mo> </mover> <mrow> <mi>DP</mi> <mo>_</mo> <mi>n</mi> </mrow> <mi>lk</mi> </msubsup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>12</mn> <mo>)</mo> </mrow> </mrow> </math>

in the formula (12), f_{DE_Inter}Is the de-interleaving function. The channel deinterleaving unit 5143 completely corresponds to the interleaving module 502 in the transmitting apparatus 50, that is, the deinterleaver adopted by the channel deinterleaving unit 5143 completely corresponds to the interleaver adopted by the interleaving module 502. When interleaving the repeated logical data blocks, when the interleavers used for the repeated data blocks in the transmitting apparatus 50 are different from each other, the inverse interleavers in the receiving apparatus 51 are different from each other, and the inverse interleavers in the receiving apparatus 51 correspond to the interleavers in the transmitting apparatus 50 one-to-one, respectively.

In the formula (13), the first and second groups,

is an estimated logical channel obtained after the inverse permutation and the deinterleaving.

Construct estimated logical channel matrix unit 5144, based on the estimationLogical channel of meter

Constructing an estimated logical channel matrix

As shown in equation (14):

obtaining a formula (15) from the formula (7), the formula (13) and the formula (14),

calculate weighting factor Unit 5145 based on the estimated logical channel matrix

Calculating a weighting factor W_Ki. As shown in equation (16):

in the formula (16)As a function of different estimation criteria. For example, using the Minimum Mean Square Error (MMSE) estimation criterion, the weighting factor W_KiAs shown in equation (17):

W_{Ki} = {(R_{N_{i}}^{l} + {\hat{H}}_{i}^{lT} H_{i}^{l})}^{- 1} H_{i}^{lT} - - - (17)

in the formula (17), the reaction is carried out,

in which is the variance matrix of additive white gaussian noise.

An equalizing module 515 for utilizing the weighting factor W_KiFor the logical data block Z after de-interleaving_i ^lPerforming equalization to generate equalized logic data blockAs in formula (18)) Shown in the figure:

{\hat{S}}_{i}^{k} = W_{Ki} Z_{i}^{l}

(18)

a restoring module 516 for restoring the equalized logical data block

Restoring to obtain initial data block S_Org ^k。

Fig. 6 is a flowchart of a method for eliminating interference from neighboring base stations according to an embodiment of the present invention, which includes the following steps:

step 601, for the initial data block S_Org ^kGrouping the data into groups to generate grouped logic data blocks S_{Org_j} ^k。

Step 602, grouping the logic data blocks S_{Org_j} ^kInterleaving to generate interleaved logic data block S_i ^k。

Step 603, for the interleaved logical data block S_i ^kRepeating to generate a repeated logic data block X_i ^k。

Interleaving the grouped logical data blocks in step 602 actually reorders the logical subcarriers in the grouped logical data blocks. Step 602 and step 603 may be exchanged, that is, the interleaving process of the logical data blocks may be performed after the grouping process or after the repeating process. If the logical data blocks are interleaved after the repeating process, each repeated logical data block needs to be interleaved, and each repeated logical data block can be interleaved by adopting a different interleaving method.

Step 604, for the repeated data block X_i ^kArranging to generate arranged physical data block

Step 605, arrange the physical data blocks in a predetermined manner

And (5) sending.

Step 606, receive physical data block in predetermined manner

Step 607, for the received physical data blockInverse arrangement is carried out to obtain a logic data block Z_{DP_i} ^l。

Step 608, for logical data block Z_{DP_i} ^lDe-interleaving to obtain a de-interleaved logic data block Z_i ^l。

Step 609, separating and estimating the physical channel according to the received pilot symbol or pilot symbol

Step 610, for the estimated physical channel

Inverse permutation is carried out to obtain an estimated logical channel

Step 611, for the estimated logical channel

De-interleaving to obtain the estimated logic channel after de-interleaving

Step 612, estimating the logical channel according to the deinterleave

Constructing an estimated logical channel matrix

613, according to the estimated logical channel matrix

Calculating a weighting factor W_Ki。

Step 614, using the weighting factor W_KiFor the logical data block Z after de-interleaving_i ^lEqualizing to obtain equalized logic data block

Step 615, for the equalized logical data block

Restoring to obtain initial data block S_Org ^k。

Fig. 7 is a schematic diagram comparing simulation results of the present invention and the prior art under the condition that two adjacent base station interferences are respectively 0dB and 10 dB. In fig. 7, the ordinate is the packet error rate, the abscissa is the signal-to-noise ratio, and the simulation environment is set as follows:

downlink: partial Usage Of subchannel configuration (PUSC);

modulation mode: quadrature Phase Shift Keying (QPSK);

coding rate: 1/2, respectively;

data block size: 100 bytes;

communication channel: ITU Ped-B (3 km/h);

The four simulation curves A, B, C, D in fig. 7 are simulation results for different simulation conditions, wherein,

the simulation conditions for curve a are:

code repetition rate: 4;

the simulation conditions for curve B are:

code repetition rate: 6;

the simulation conditions for curve C are:

code repetition rate: 4;

the antenna structure is as follows: single Input Multiple Output (SIMO) 1x2, i.e. 1 transmit antenna, 2 receive antennas;

the simulation conditions for curve D are:

the code repetition rate is 3;

the antenna structure is a Single Input Single Output (SISO), i.e. 1 transmitting antenna and 1 receiving antenna.

As can be seen from FIG. 7, the simulation curve D obtained by the method for eliminating interference of adjacent base stations provided by the present invention is far superior to the curve A, B, C obtained by the existing maximum synthesis technology. The curve D error rate can meet the wireless communication requirement of less than one percent.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modification, change, combination, equivalent replacement, improvement, etc. made to the embodiments of the present invention within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for canceling interference from a nearby base station, comprising:

a transmitting device and a receiving device;

the transmitting device comprises a grouping module, an interweaving module, a repeating module, an arranging module and a transmitting module, wherein the grouping module is connected with the interweaving module, the interweaving module is connected with the repeating module, the repeating module is connected with the arranging module, the arranging module is connected with the transmitting module,

a transmitting module, configured to send the arranged physical data blocks in a predetermined manner;

the receiving device comprises a receiving module, an inverse permutation module, a de-interleaving module, a channel estimation module, an equalization module and a restoration module, wherein the receiving module is connected to the inverse permutation module, the inverse permutation module is connected to the de-interleaving module, the de-interleaving module is connected to the channel estimation module, the channel estimation module is connected to the equalization module, the equalization module is connected to the restoration module,

a receiving module for receiving the physical data block in a predetermined manner;

the channel estimation module is used for separating and estimating physical channels of a target base station and an adjacent base station according to received pilot symbols or pilot symbols, wherein the physical channel of the target base station is a physical channel from the target base station to a receiving device; carrying out inverse permutation on the estimated physical channel to obtain an estimated logical channel after the inverse permutation; de-interleaving the inversely arranged estimated logical channels to obtain de-interleaved estimated logical channels; constructing an estimated logical channel matrix according to the estimated logical channel after de-interleaving; calculating a weighting coefficient according to the estimated logical channel matrix; the physical channel of the adjacent base station is a physical channel from the adjacent base station to the receiving device;

2. The system of claim 1, wherein the channel estimation module comprises:

3. The system of claim 1, wherein the grouping, interleaving and repeatedly generating the logical data blocks for the initial data blocks comprises:

4. The system of claim 3, wherein the grouping, repeating, and interleaving the initial data block to generate the logical data block comprises:

5. The system of claim 1,

the inverse process of arranging the data and the inverse arrangement of the data are corresponding to each other;

6. The system of claim 1,

7. The system of claim 1,

the estimated logical channel matrix is a full rank matrix.

8. A transmitter for canceling interference from a neighboring base station, comprising:

a grouping module, an interleaving module, a repeating module, an arranging module and a transmitting module, wherein the grouping module is connected to the interleaving module, the interleaving module is connected to the repeating module, the repeating module is connected to the arranging module, the arranging module is connected to the transmitting module,

9. A transmitter for canceling interference from a neighboring base station, comprising:

a grouping module, an interleaving module, a repeating module, an arranging module and a transmitting module, wherein the grouping module is connected to the repeating module, the repeating module is connected to the interleaving module, the interleaving module is connected to the arranging module, the arranging module is connected to the transmitting module,

10. A receiving apparatus for canceling interference of an adjacent base station, comprising:

a receiving module, an inverse permutation module, a de-interleaving module, a channel estimation module, an equalization module and a restoration module, wherein the receiving module is connected to the inverse permutation module, the inverse permutation module is connected to the de-interleaving module, the de-interleaving module is connected to the channel estimation module, the channel estimation module is connected to the equalization module, the equalization module is connected to the restoration module,

the channel estimation module is used for separating and estimating physical channels of a target base station and an adjacent base station according to received pilot symbols or pilot symbols, wherein the physical channel of the target base station is a physical channel from the target base station to a receiving device; the physical channel of the adjacent base station is a physical channel from the adjacent base station to the receiving device; carrying out inverse permutation on the estimated physical channel to obtain an estimated logical channel after the inverse permutation; de-interleaving the inversely arranged estimated logical channels to obtain de-interleaved estimated logical channels; constructing an estimated logical channel matrix according to the estimated logical channel after de-interleaving; calculating a weighting coefficient according to the estimated logical channel matrix; wherein, the physical channel of the target base station is the physical channel from the target base station to the receiving device; the physical channel of the adjacent base station is a physical channel from the adjacent base station to the receiving device;

11. The receiving apparatus as claimed in claim 10, wherein the channel estimation module comprises: