KR100901873B1 - Method for transmitting and receiving broadcast channel signal - Google Patents

Abstract

The present invention relates to a broadcast channel signal transmission method and a reception method.

In the present invention, the transmitter transmits a broadcast channel signal by changing a symbol mapping pattern applied at every broadcast channel signal transmission.

Also, a broadcast channel signal may be transmitted by differently applying a symbol mapping rule representing a change in a symbol mapping pattern applied to every broadcast channel for each cell.

BCH, soft combining, symbol mapping, broadcast channel

Description

Method for transmitting and receiving broadcast channel signal {Method for transmitting and receiving broadcast channel signal}

The present invention relates to a broadcast channel signal transmission method and a reception method.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management Number: 2005-S-404-13, Project Name: 3G Evolution Wireless Transmission Technology] .

Since the broadcast channel (BCH) signal includes system information, the same signal can be transmitted every transmission period. Accordingly, the receiver may use a soft-combining scheme of coherently combining and demodulating a previously received BCH signal and a currently received BCH signal to improve the demodulation performance of the BCH signal.

In particular, in an environment in which interference and noise have little correlation with time, demodulating a BCH signal using a soft combining method increases the ratio of signal to interference and noise as the number of soft combining increases. For example, if the thermal noise acts as the main interference component rather than interference in the demodulation of the BCH signal, and the transmission period of the BCH signal is one frame, the terminal fails to demodulate the BCH signal in the frame # 0 and received in the frame # 1. When the BCH signal is coherently summed with the BCH signal received in frame # 0, the signal-to-interference ratio increases. Thus, the probability of successful demodulation of the BCH signal in frame # 1 is much higher than the probability of successful in frame # 0.

Meanwhile, in an environment in which interference of another cell serves as a major interference component for demodulation of a BCH signal and the terminal moves at a low speed, there is no advantage obtained through such soft combining. The reason is that the signal-to-interference ratio does not increase significantly even when soft combining in frame # 1 because other cell interference present in frame # 0 is almost the same as other cell interference present in frame # 1. For example, when a UE receives a BCH signal from two cells, s _n ⁽¹⁾ and s _n ⁽²⁾ are referred to as the n-th BCH symbol transmitted by cell # 1 and cell # 2, respectively, and h _i and g _{When i} is a channel value for cells # 1 and # 2 of the i th subcarrier, the 0 th BCH symbol received in frame # 0 and the 0 th BCH symbol received in frame # 1 are represented by the following equations (1) and (1). It may be represented by Equation 2.

Here, x ₀ (0) is a signal received through the 0 th subcarrier in frame # 0, and x ₀ (1) is a signal received through the 0 th subcarrier in frame # 1. In this case, it is assumed that the channel state does not change with time. A value that has undergone channel compensation to demodulate s ₀ ⁽¹⁾ in frames # 0 and # 1 may be expressed by Equation 3 below.

와 같이 나타낼 수 있으므로 신호 대 간섭은 프레임 #1에서 소프트 컴바이닝을 하여도 변화가 없음을 알 수 있다. Here, z ₀ (0) and z ₀ (1) are values obtained by soft combining (only in case of z ₀ (1)) through channel compensation on data received in frames # 0 and # 1, respectively. In Equation 3 above, the complex coefficient of the interference component by the cell # 2 is

Since the signal-to-interference does not change even after soft combining in frame # 1, it can be seen that

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a broadcast channel signal transmission method and a reception method for improving demodulation performance of a broadcast channel signal.

Broadcast channel signal transmission method of a transmitter according to a feature of the present invention for achieving the above object,

Selecting a second symbol mapping pattern different from the first symbol mapping pattern of the previous transmission period as the mapping pattern of each broadcast channel symbol of the current transmission period; And transmitting a broadcast channel signal based on the second symbol mapping pattern.

In addition, the broadcast channel signal transmission method according to another aspect of the present invention,

Transmitting a first broadcast channel signal corresponding to a first cell by using a first symbol mapping rule for differently selecting a symbol mapping pattern applied every transmission period; And transmitting a second broadcast channel signal corresponding to a second cell by using a second symbol mapping rule that is different from the first symbol mapping rule that has a symbol mapping pattern applied to each transmission period.

In addition, the method for receiving a broadcast channel signal of a receiver according to another aspect of the present invention,

Extracting a broadcast channel signal from the received signal; Extracting broadcast channel symbols corresponding to each of a plurality of different symbol mapping patterns through symbol demapping; Outputting a plurality of data obtained by soft combining the extracted broadcast channel symbols based on each of a plurality of symbol mapping rules having a different order of applying the plurality of symbol mapping patterns; And decoding broadcast channel data using data without a seed error among the plurality of data.

According to the present invention, the signal-to-interference ratio of the receiver demodulating the BCH signal through soft combining increases by changing the symbol symbol mapping pattern applied by the transmitter every BCH signal transmission.

In addition, each cell transmits a BCH signal using different symbol mapping rules, thereby having an effect of randomizing inter-cell interference over time.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, terms such as "... unit" described in the specification means a unit for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software.

In the present specification, a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.

In the present specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B (Node-B), and an eNB (Evolved Node-B) transmitting and receiving base station (Base) It may refer to a Transceiver Station (BTS), a Mobile Multihop Relay (MMR) -BS, or the like, and may include all or a part of functions such as an access point, a radio access station, a Node B, an eNB, a transceiver base station, and an MMR-BS. have.

Hereinafter, a method of transmitting and receiving broadcast channel (BCH) signals in a mobile communication system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Meanwhile, although an embodiment of the present invention describes an orthogonal frequency division multiplexing (OFDM) based mobile communication system as an example, the present invention may be applied to other mobile communication systems.

Next, the BCH signal transmission method and reception method and the receiver for receiving the BCH signal in the mobile communication system according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

1 is a structural diagram showing a transmitter in a mobile communication system according to a first embodiment of the present invention, which shows a base station transmitter when there is one transmitting antenna.

Referring to FIG. 1, the transmitter includes an encoder 110, a symbol mapping unit 120, a multiplexer 130, and an inverse fast fourier transform (IFFT) unit 140. , A radio frequency (RF) transmitter 150 and a transmit antenna.

The encoder 110 converts BCH data in units of bits into a BCH symbol, and the symbol mapping unit 120 performs a function of mapping a BCH symbol to a frequency. At this time, the symbol mapping unit 120 changes the symbol mapping pattern of the BCH symbol at every transmission of the BCH signal. Here, each transmitted BCH signal is composed of a plurality of BCH symbols, and the BCH symbol means a minimum BCH data unit divided for use in frequency mapping of BCH data included in the BCH signal. In addition, the symbol mapping pattern indicates to which frequency each BCH symbol is mapped.

Meanwhile, in the embodiment of the present invention, a case in which N BCH symbols included in a BCH signal transmitted every transmission period is transmitted using N subcarriers will be described as an example. However, the present invention provides N N BCH symbols. It is also applicable to transmission over smaller subcarriers.

The multiplexer 130 arranges other channel signals and BCH signals according to a predetermined pattern in the time / frequency domain, and the arranged BCH signals are transmitted through the transmission antenna via the IFFT unit 140 and the RF transmitter 150. do.

2 is a diagram illustrating a change in a symbol mapping pattern with time of a transmitter according to a first embodiment of the present invention, in which a transmission period of a BCH signal is one frame and a symbol mapping pattern of a BCH symbol is changed every frame. Indicates.

Meanwhile, in the embodiment of the present invention, the case where the transmission period of the BCH signal is one frame will be described as an example. However, the present invention can be applied to the case where the transmission period of the BCH signal is a plurality of frames.

2, the transmitter changes the symbol mapping pattern of BCH symbols every frame. The 0 th BCH symbol S ₀ will be described as an example. The 0 th BCH symbol is transmitted using a 0 th subcarrier in a frame # 0, and is transmitted through a K (0) th subcarrier in a frame # 1.

Where K (n) represents the frequency mapping of the nth BCH symbol as a function of BCH symbol index n. In this case, K (n) is set such that an interval between frequencies used for transmitting the same BCH symbol in an adjacent frame is larger than a coherence band of a channel. For example, K (0) is set so that the interval between the frequency used when transmitting the 0th BCH symbol in frame # 0 and the frequency used when transmitting in frame # 1 is larger than the coherence band of the channel. . K (n) is set to have different values for each BCH symbol.

As described above, when the BCH signal is transmitted by changing the frequency symbol mapping pattern of each BCH symbol at every transmission of the BCH signal, since the interference component of another cell is randomized in the process of performing channel compensation by the UE, due to soft combining The advantage is that the signal-to-interference component ratio is increased. This effect is described with an example of the 0 th BCH symbol S ₀ as follows.

First, a signal ( x ₀ (0)) received through the 0th subcarrier of frame # 0 and a signal ( x _{k (0)} (1)) received through the K (0) th subcarrier of frame # 1 are It can be represented by the following equation (4) and (5).

Where s _n ⁽¹⁾ and s _n ⁽²⁾ represent the n-th BCH symbol transmitted in cell # 1 and cell # 2, respectively, and h _i and g _i are cell # 1 and cell # for the i-th subcarrier, respectively. Indicates a channel value for two.

Meanwhile, a value that has undergone channel compensation to demodulate the 0 th BCH symbol s ₀ ⁽¹⁾ of cell # 1 in two frames may be expressed by Equation 6 below.

Here, z ₀ ⁽⁰⁾ and z ₀ ⁽¹⁾ are values obtained by soft combining (only for z ₀ ⁽¹⁾⁾ after performing channel compensation in frames # 0 and # 1, respectively, as described above. Unlike Equation 3, the complex coefficient of the interference component by the cell # 2 may be expressed as Equation 7 below.

인 경우에는 간섭 성분의 전력이 소프트 컴바이닝으로 인하여 감소함을 알 수 있다. Therefore, when there are two or more multipaths in a channel and there is frequency selectivity, and the spacing K (n) between two subcarriers used to transmit the same BCH symbol is large enough, that is,

It can be seen that the power of the interference component decreases due to soft combining.

Meanwhile, according to an embodiment of the present invention, a symbol mapping rule for mapping BCH symbols to frequencies according to time includes two symbol mapping patterns, and two symbol mapping patterns are alternately used for every transmission of the BCH signal. For example, in the present invention, the symbol mapping rule may alternately use two or more symbol mapping patterns.

3 is a structural diagram illustrating a receiver in a mobile communication system according to a first embodiment of the present invention.

Referring to FIG. 3, the receiver includes a reception antenna, an RF receiver 210, a fast Fourier transform (FFT) unit 220, a BCH signal extractor 230, a channel estimator 240, and a blinder BCH decoder ( decoder 250).

When the signal received through the receiving antenna is input via the RF receiver 210, the FFT unit 220 converts the signal output from the RF receiver 210 into the frequency domain. The BCH signal extractor 230 extracts the BCH signal from the frequency-converted signal, and the channel estimator 240 estimates a channel with respect to time and frequency used to transmit the BCH signal.

The blinder BCH decoder 250 decodes the BCH data by performing coherent addition, that is, soft combining, using the BCH signal extracted from the BCH signal extractor 230 and the channel estimate extracted from the channel estimator 240. do.

4 is a structural diagram illustrating a blinder BCH decoder 250 of the receiver according to the first embodiment of the present invention.

Referring to FIG. 4, the weight multiplier 251, the symbol inverse mapping unit (symbol inverse mapping unit # 1 and the symbol inverse mapping unit # 2) 252, the switch 253, the adding unit (the adding unit # 1 and the adding unit) Part # 2) 254 and decoder 255 are included.

The weight multiplier 251 multiplies the BCH signal x _i extracted from the BCH signal extractor 230 by the weight, that is, the conjugate value of the channel estimate value h _i , and outputs the MLC. It is a weight multiplier of (Maximal Ratio Combining, MRC) method.

The symbol inverse mapping unit 252 exists as many as the number of symbol mapping patterns included in the symbol mapping rule of the transmitter, and each symbol inverse mapping unit 252 performs inverse mapping according to each symbol mapping pattern to sequentially order the BCH symbols. Extract. For example, when receiving a BCH signal transmitted as shown in FIG. 2, the symbol inverse mapping unit # 1 252 performs inverse mapping according to a symbol mapping pattern applied to an even frame, and the symbol inverse mapping unit # 2 ( 252 performs reverse mapping according to the symbol mapping pattern applied to the odd frame. To this end, the receiver shares the symbol mapping rule of each cell with the transmitter.

The adder 254 exists as many as the number of symbol mapping patterns included in the symbol mapping rule of the transmitter, and performs soft combining that sums the outputs of the symbol demapping unit 252.

At this time, each adder 254 changes the symbol demapping unit 252 for receiving the BCH symbol every time the BCH signal is received in conjunction with the switch 253. Accordingly, the symbol mapping pattern corresponding to the BCH symbol input to one summer unit 254 is changed at each reception of the BCH signal. In addition, each adder 254 performs addition based on different symbol mapping pattern application orders. That is, each adder 254 sets a plurality of symbol mapping rules so that the first symbol mapping pattern is different based on the symbol mapping rule of the transmitter, and performs the sum based on each symbol mapping rule.

For example, as shown in FIG. 2, when the symbol mapping pattern is changed every frame, adding unit # 1 254 may apply the changed symbol mapping pattern every frame starting with the BCH symbol corresponding to the first symbol mapping pattern. The corresponding BCH symbols are summed. On the other hand, the adder # 2 254 adds the BCH symbols corresponding to the changed symbol mapping pattern every frame, starting with the BCH symbol corresponding to the second symbol mapping pattern. As such, when the order of the symbol mapping patterns corresponding to the BCH symbols inputted for each adder 254 is differently applied, one of the plurality of adders 254 operates in synchronization with the symbol mapping rule of the transmitter. It is possible to sum the BCH symbols corresponding to the mapping rule.

The decoder 255 decodes the data summed by the adders 254 and decodes the BCH data using data that does not have a cyclic redundancy check (CRC) error.

Meanwhile, in the first embodiment of the present invention, the case where the number of transmitting antennas is one has been described as an example, but the present invention can be applied even when there are a plurality of transmitting antennas. Hereinafter, a method of transmitting a BCH signal according to an embodiment of the present invention will be described with reference to the drawings with respect to a plurality of transmitting antennas.

Next, a BCH signal transmission method of a transmitter in a mobile communication system according to a second embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

FIG. 5 is a structural diagram illustrating a transmitter in a mobile communication system according to a second embodiment of the present invention, and illustrates a case where a BCH signal is transmitted through a space frequency block coding (SFBC) diversity scheme. 6 is a diagram illustrating a change in a symbol mapping pattern according to a time of a transmitter according to a second embodiment of the present invention, in which a transmission period of a BCH signal is one frame and a symbol mapping pattern of a BCH symbol is changed every frame. The case is shown.

The transmitter according to the second embodiment of the present invention includes the same functional blocks 110 to 150 as the functional blocks included in the transmitter of the first embodiment, and further includes a space-time encoder 160. Therefore, description of the same block as the transmitter of the first embodiment will be omitted.

Referring to FIG. 5, the space-time encoder 160 outputs to the symbol mapping unit 120 by applying the SFBC method to the BCH signal output from the encoder 110.

As shown in FIG. 6, the symbol mapping unit 120 receives two BCH symbols transmitted at two adjacent frequencies into one group and applies a symbol mapping rule to each group. For example, the first BCH symbol and the second BCH symbol transmitted in frame # 0 are grouped into one group, and when the next BCH signal is transmitted, the corresponding group is moved by K (0) subcarriers and transmitted.

As such, applying the symbol mapping rule by grouping two adjacent BCH symbols into one group is to improve demodulation performance of a receiver receiving a BCH signal transmitted in SFBC.

Next, a BCH signal transmission method of a transmitter in a mobile communication system according to a third embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8.

FIG. 7 is a structural diagram illustrating a transmitter in a mobile communication system according to a third embodiment of the present invention, and illustrates a case where a BCH signal is transmitted through a frequency domain cyclic delay diversity (CDD) scheme. 8 is a diagram illustrating a change in a symbol mapping pattern according to a time of a transmitter according to a third embodiment of the present invention. A transmission period of a BCH signal is one frame and a symbol mapping pattern of a BCH symbol is changed every frame. The case is shown.

Here, the frequency domain CDD scheme represents a scheme of changing and applying the beamforming weight vector whenever the subcarrier is changed.

Meanwhile, the transmitter according to the third exemplary embodiment includes the same functional blocks 110 to 150 as the functional blocks included in the transmitter of the first exemplary embodiment, and further includes a frequency domain CDD unit 170. Therefore, description of the same block as the transmitter of the first embodiment will be omitted.

Referring to FIG. 7, the frequency domain CDD unit 170 outputs to the symbol mapping unit 120 by applying the frequency domain CDD scheme to the BCH signal output from the encoder 110.

As shown in FIG. 8, the symbol mapping unit 120 receives the BCH signal by changing a symbol mapping pattern at every transmission of the BCH signal.

라 하면, 도 7의 송신기는 BCH 신호의 복조 성능을 향상시키기 위해 매 BCH 신호의 송신 시마다 즉, 매 프레임마다 심벌 매핑 패턴을 변경하여 각 BCH 심벌을 송신하는 서브캐리어를 변경할 뿐만 아니라, 적용하는 빔형성 가중치 벡터 도 변경한다. 예를 들어, 프레임 #0에서는 첫 번째 BCH 심벌(s ₀)에 빔형성 가중치,

를 적용하여 0번째 서브캐리어를 통해 송신하고, 프레임 #1에서는 첫 번째 BCH 심벌(s ₀)에 빔형성 가중치,

을 적용하여 K(0)번째 서브캐리어를 통해 송신한다. At this time, the beamforming weight vector used for the transmission of the 0th BCH symbol

For example, the transmitter of FIG. 7 changes the subcarrier for transmitting each BCH symbol by changing the symbol mapping pattern every transmission of the BCH signal, that is, every frame, to improve the demodulation performance of the BCH signal. Also change the formation weight vector. For example, in frame # 0, the beamforming weight is assigned to the first BCH symbol s ₀ ,

Is transmitted through the 0 th subcarrier, and in the frame # 1, the beamforming weight is applied to the first BCH symbol s ₀ ,

Apply on the K (0) th subcarrier.

As described above, changing the beamforming weight vector as well as the symbol mapping pattern at every transmission of the BCH signal lowers the correlation between the two subcarriers, thereby further reducing the interference component when demodulating the BCH signal. In particular, this effect is further increased for flat channels in the frequency domain.

On the other hand, the present invention can be applied not only to the case where the beamforming weights w ₀ ⁽⁰⁾ and w ₀ ⁽¹⁾ applied to the BCH symbol are not orthogonal to each other.

Next, a method of transmitting a BCH signal of a transmitter in a mobile communication system according to a fourth embodiment of the present invention will be described in detail with reference to FIGS. 9 and 10.

FIG. 9 is a structural diagram illustrating a transmitter in a mobile communication system according to a fourth embodiment of the present invention, and illustrates a case where a BCH signal is transmitted through a frequency switching transmission diversity (FSTD) scheme. 10 is a diagram illustrating a change in a symbol mapping pattern according to a time of a transmitter according to a fourth embodiment of the present invention. A transmission period of a BCH signal is one frame and a symbol mapping pattern of a BCH symbol is changed every frame. The case is shown.

The transmitter according to the fourth embodiment of the present invention includes the same functional blocks 110 to 150 as the functional blocks included in the transmitter of the first embodiment, and further includes an FSTD modulator 180. Therefore, description of the same block as the transmitter of the first embodiment will be omitted.

Referring to FIG. 9, the FSTD modulator 180 performs FSTD modulation on the BCH signal output from the encoder 110 and outputs the FSTD modulation to each symbol mapping unit 120.

As shown in FIG. 9, the symbol mapping unit 120 receives the unused subcarriers adjacent to one BCH symbol into one group and applies a symbol mapping rule to each group. For example, the first BCH symbol transmitted in frame # 0 and adjacent unused subcarriers are grouped into one group, and when the next BCH signal is transmitted, the group is moved by K (0) subcarriers and transmitted. ..

Meanwhile, in the present invention, all cells may use the symbol mapping rule in common. In this case, an implementation complexity of the UE may be reduced.

On the other hand, when the symbol mapping rules are commonly used in all cells, the same BCH symbols of each cell may collide with each reception of the BCH signal. Figure 2, for example, interference of symbols s ₀ ⁽¹⁾ with respect to all frames # 0 and # 1 of the frame, as shown in Equation 4 and Equation 5 are the s ₀ ^(2). Thus, in order to randomize the inter-cell interference, a limitation arises that the frequency interval K (0) must be sufficiently larger than the coherence bandwidth of the channel.

In order to solve this problem, the present invention can also apply symbol mapping rules differently to all cells to randomize interference of each cell.

Hereinafter, a method of transmitting a BCH signal of a transmitter according to an embodiment of the present invention will be described with reference to the drawings for applying different symbol mapping rules for each cell.

Next, a BCH signal transmission method of a transmitter in a mobile communication system according to a fifth embodiment of the present invention will be described in detail with reference to FIG. 11.

FIG. 11 illustrates an example of a plurality of symbol matching rules applied to each cell according to the fifth embodiment of the present invention. In case of transmitting N BCH symbols with one OFDM symbol, N symbol mapping rules For example, how to create.

11, any two BCH symbols that collided in frame # 0 do not collide again in frame # 1. Therefore, each cell can randomize one-to-cell interference by selecting one of the symbol mapping rules shown in FIG. 11 and using it for BCH signal transmission.

Table 1 shows symbol mapping patterns in frame # 1 when the symbol mapping rule shown in FIG. 11 is used.

Table 1. Symbol Mapping Pattern (K (n)) in Frame # 1

Meanwhile, when using the symbol mapping rules shown in FIG. 11, the number of usable symbol mapping rules is determined according to the number N of subcarriers used for BCH signal transmission. For example, when M OFDM symbols and N subcarriers are used for BCH signal transmission, the number of usable symbol mapping rules is M * N.

However, if you design a symbol mapping rule so that some of the two BCH symbols that collide in frame # 0 collide also in frame # 1, as shown in Table 2 below, the number of symbol mapping rules can be much greater than M * N. Can be.

Table 2. Symbol Mapping Pattern (K (n)) in Frame # 1

As described above, when the BCH signal is transmitted by changing the symbol mapping pattern applied at every BCH signal transmission, when the receiver demodulates the BCH symbol through soft combining, the signal-to-interference increases with time. have.

In addition, each cell uses a different symbol mapping pattern over time, thereby randomizing inter-cell interference over time.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a structural diagram illustrating a transmitter in a mobile communication system according to a first embodiment of the present invention.

2 illustrates an example of a change in a symbol mapping pattern over time of a transmitter according to a first embodiment of the present invention.

3 is a structural diagram illustrating a receiver in a mobile communication system according to a first embodiment of the present invention.

4 is a structural diagram illustrating a blinder BCH decoder of a receiver according to the first embodiment of the present invention.

5 is a structural diagram illustrating a transmitter in a mobile communication system according to a second embodiment of the present invention.

6 illustrates an example of a change in a symbol mapping pattern over time of a transmitter according to a second embodiment of the present invention.

7 is a structural diagram illustrating a transmitter in a mobile communication system according to a third embodiment of the present invention.

8 illustrates an example of a change in a symbol mapping pattern with time of a transmitter according to a third embodiment of the present invention.

9 is a structural diagram illustrating a transmitter in a mobile communication system according to a fourth embodiment of the present invention.

FIG. 10 illustrates an example of a change in a symbol mapping pattern over time of a transmitter according to a fourth embodiment of the present invention.

11 illustrates an example of a plurality of symbol matching rules applied to each cell according to the fifth embodiment of the present invention.

Claims (9)

In the broadcast channel signal transmission method of the transmitter, For each transmission period, selecting a second symbol mapping pattern different from the first symbol mapping pattern of the previous transmission period as the mapping pattern of each broadcast channel symbol of the current transmission period; And Transmitting a broadcast channel signal based on the second symbol mapping pattern Including, And the first symbol mapping pattern and the second symbol mapping pattern have different frequencies for mapping the same broadcast channel symbol. The method of claim 1, And a distance between a frequency used in the first symbol mapping pattern and a frequency used in the second symbol mapping pattern to map the same broadcast channel symbol is greater than a coherence band of the channel. The method of claim 1, Selecting a second beamforming weight vector different from the first beamforming weight vector of the previous transmission period as the beamforming weight vector of the current transmission period More, The transmitting step, And transmitting the broadcast channel signal using the second beamforming weight vector. Transmitting a first broadcast channel signal corresponding to a first cell by using a first symbol mapping rule for differently selecting a symbol mapping pattern applied every transmission period; And Transmitting a second broadcast channel signal corresponding to a second cell by using a second symbol mapping rule that is different from the first symbol mapping rule in a symbol mapping pattern applied every transmission period; Including, And a broadcast channel symbol of the second broadcast channel signal colliding with the first broadcast channel signal is different for each transmission period. delete The method of claim 4, wherein At least one of the broadcast channel symbols of the second broadcast channel signal that collides with the first broadcast channel signal in each transmission period is a broadcast channel signal that is a broadcast channel symbol that collided with the first broadcast channel signal in a previous transmission period. Way. In the method for receiving a broadcast channel signal of a receiver, Extracting a broadcast channel signal from the received signal; Extracting broadcast channel symbols corresponding to each of a plurality of different symbol mapping patterns through symbol demapping; Outputting a plurality of data obtained by soft combining the extracted broadcast channel symbols based on each of a plurality of symbol mapping rules having a different order of applying the plurality of symbol mapping patterns; And Decoding broadcast channel data using data without a seed error among the plurality of data; Broadcast channel signal reception method comprising a. The method of claim 7, wherein And a plurality of symbol mapping patterns having different frequency mappings of each symbol. The method of claim 7, wherein The symbol mapping rule is, A method of receiving a broadcast channel signal in which a symbol mapping pattern applied to every broadcast channel signal is changed.

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