WO2017054528A1 - Method and apparatus for determining correction signal - Google Patents

Abstract

The present invention provides a method and apparatus for determining a correction signal, which are used for obtaining a correction signal for joint correction of receiving and transmitting channels between radio remote units (RRUs). The method comprises: a base band unit (BBU) obtains from a first RRU a first receiving power, the first receiving power being the power when the first RRU receives a first signal transmitted by a second RRU; when the result of a comparison between the first receiving power and a power threshold does not meet a preset condition, the BBU adjusts the first signal to obtain a second signal, and determines on the basis of the second signal, a second receiving power; the second receiving power is the power when the first RRU receives the second signal, and the result of a comparison between the second receiving power and the power threshold meets the preset condition; the BBU takes the second signal as a correction signal, which is used for the joint correction of receiving and transmitting channels between the first RRU and the second RRU.

Description

Correction signal determination method and device

The present application claims priority to Chinese Patent Application No. 201510641645.8, entitled "A Method and Apparatus for Correcting Signals", filed on September 30, 2015, the entire contents of which is incorporated herein by reference. in.

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for determining a correction signal.

Background technique

Beam Forming (BF) technology improves the user's Signal to Interference plus Noise Ratio (SINR) by weighting at the signal transmitting end and obtaining the array gain at the signal receiving end. The BF technology needs to ensure that the delay and phase of the transmitted signal arrive at each antenna port are the same, but the jitter of the first in first out (FIFO) memory in the IF part of the transceiver channel, the inconsistency of the response of the RF analog device, when not in progress In the case of domain channel compensation or frequency domain channel compensation, there is no guarantee that the delay and phase of the transmitted signal reaching each antenna port are the same. Therefore, the transceiver channel needs to be corrected to compensate the channel response difference of each transmit channel in the time domain and the frequency domain to obtain the BF array gain.

The prior art can implement the correction of the transceiver channel of a single radio remote unit (RRU), but there are still some problems in the joint correction process between the RRUs. In the joint correction process between the RRUs, if the transmit power of the transmit signal is too large, the receive power of the receive signal will be large when the spatial attenuation is constant. In this case, automatic gain control is required. Automatic Gain Control (AGC) initiates control to avoid signal distortion caused by saturation of the Analog-to-Digital Converter (ADC). However, the AGC start control will cause a channel response change, which in turn affects the joint correction process of the transceiver channel. Therefore, how to realize the joint correction of the transmission and reception channels between the RRUs in the case that the AGC does not start the control is essential for realizing the joint correction of the transmission and reception channels between the RRUs.

Summary of the invention

The present invention provides a method and apparatus for determining a correction signal for obtaining a correction signal for joint correction of a transmission and reception channel between RRUs.

In a first aspect, a method for determining a correction signal according to an embodiment of the present invention includes:

The baseband unit BBU obtains the first received power, and the first received power is the power when the first radio remote unit RRU receives the first signal transmitted by the second RRU;

When the comparison result between the first received power and the power threshold does not satisfy the preset condition, the BBU adjusts the first signal to obtain the second signal, and determines the second received power according to the second signal; the second received power is the second RRU receives the second The power of the signal, the comparison result of the second received power and the power threshold meets a preset condition;

The BBU uses the second signal as a correction signal, and the correction signal is used for joint correction of the first RRU and the second RRU for transmitting and receiving channels.

With reference to the first aspect, in a first possible implementation, when the comparison result of the first received power and the power threshold does not meet the preset condition, the BBU adjusts the first signal to obtain the second signal, including:

When the first received power is greater than or equal to the first power threshold, the BBU multiplies the first signal S(k) by the frequency domain.

Obtaining a second signal, where a second received power corresponding to the second signal is smaller than a first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

When the first received power is greater than or equal to the first power threshold, the BBU multiplies the first signal S(n) by the time domain.

Obtaining a second signal, where a second received power corresponding to the second signal is less than a first power threshold, and n represents a time domain sample sequence number of the first signal;

Delta represents the digital power control coefficient, Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.

With reference to the first aspect, in a second possible implementation manner, when the comparison result of the first received power and the power threshold does not meet the preset condition, the BBU adjusts the first signal to obtain the second signal, including:

When the first received power is greater than or equal to the first power threshold, the BBU shifts the first signal to the right in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is smaller than the first The power threshold, the first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power.

In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the first power threshold is set according to the input antenna power of the first RRU.

With reference to the first aspect, in a fourth possible implementation manner, when the comparison result of the first received power and the power threshold does not satisfy the condition, the BBU adjusts the first signal to obtain the second signal, including:

When the first received power is less than or equal to the second power threshold, the BBU intermittently places the subcarriers of the first signal to obtain a second signal, where the second received power corresponding to the second signal is greater than the third power threshold, and the second received power is The power when the first RRU receives the subcarrier of the second signal.

With reference to the first aspect, in a fifth possible implementation manner, when the comparison result of the first received power and the power threshold does not meet the preset condition, the BBU adjusts the first signal to obtain the second signal, including:

When the first received power is less than or equal to the second power threshold, the BBU shifts the first signal to the left in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is greater than the second power threshold. The first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation of the first aspect, the second power threshold is set according to signal noise power.

A second aspect of the present invention provides a calibration signal determining apparatus, including:

a transceiver unit, configured to acquire a first received power, where the first received power is a power when the first radio remote unit RRU receives the first signal sent by the second RRU;

a processing unit, configured to: when the comparison result of the first received power and the power threshold determined by the transceiver unit does not satisfy the preset condition, adjust the first signal to obtain the second signal, and determine the second received power according to the second signal; The power is the power when the first RRU receives the second signal, the comparison result of the second received power and the power threshold meets the preset condition; the second signal is used as the correction signal, and the correction signal is used for the first RRU and the second RRU to transmit and receive channels Joint correction.

With reference to the second aspect, in a first possible implementation manner, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processing unit adjusts the first signal to obtain the second signal, Specifically used for:

Multiplying the first signal S(k) in the frequency domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is smaller than a first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

Multiplying the first signal S(n) in the time domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is less than a first power threshold, and n represents a time domain sample sequence number of the first signal;

Delta represents the digital power control coefficient, Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.

With reference to the second aspect, in a second possible implementation manner, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processing unit adjusts the first signal to obtain the second signal, the processing unit is specifically configured to:

When the first received power is greater than or equal to the first power threshold, the first signal is shifted to the right in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is smaller than the first power threshold. The first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power.

In conjunction with the first or second possible implementation of the second aspect, in a third possible implementation of the second aspect, the first power threshold is set according to the input antenna power of the first RRU.

With reference to the second aspect, in a fourth possible implementation manner, when the comparison result of the first received power and the power threshold does not satisfy the condition, when the processing unit adjusts the first signal to obtain the second signal, specifically:

When the first received power is less than or equal to the second power threshold, the subcarriers of the first signal are intermittently placed to obtain a second signal, and the second received power corresponding to the second signal is greater than a third power threshold, and the second received power is The power at which an RRU receives the subcarriers of the second signal.

With reference to the second aspect, in a fifth possible implementation manner, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processing unit adjusts the first signal to obtain the second signal, Specifically used for:

When the first received power is less than or equal to the second power threshold, the first signal is shifted to the left in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is greater than the second power threshold. The first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.

In conjunction with the fifth possible implementation of the second aspect, in a sixth possible implementation of the second aspect, the second power threshold is set according to signal noise power.

In the embodiment of the present invention, the BBU obtains the first received power from the first RRU, and the first received power is the power when the first RRU receives the first signal sent by the second RRU; when the comparison between the first received power and the power threshold is not When the preset condition is met, the BBU adjusts the first signal to obtain the second signal, and determines the second received power according to the second signal; the second received power is the power when the first RRU receives the second signal, and the second received power and power threshold The comparison result satisfies the preset condition; the BBU uses the second signal as a correction signal, and the correction signal is used for joint correction of the first RRU and the second RRU for transmitting and receiving channels. Since the correction signal obtained by adjusting the transmission signal of the BBU satisfies the preset condition, the channel response change caused by the AGC start control triggered by the excessive correction signal can be avoided, and the correction signal can be used to jointly correct the transmission and reception channels between the RRUs. Therefore, according to the technical solution provided by the embodiment of the present invention, the joint correction of the transceiver channel between the RRUs can still be implemented without the AGC starting control.

DRAWINGS

FIG. 1 is a schematic diagram of a double-split RRU scenario according to an embodiment of the present invention;

2 is a schematic flowchart of a method for determining a correction signal according to an embodiment of the present invention;

FIG. 3 is a schematic flowchart of a method for jointly adjusting a transceiver channel between RRUs according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a calibration signal determining apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a calibration signal determining apparatus according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the invention provides a method and a device for determining a correction signal, which are used to obtain a correction signal for joint correction of a transmission and reception channel between RRUs, and further use the correction signal to perform joint correction of the transmission and reception channels between RRUs. The method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.

The technical solution provided by the embodiment of the present invention relates to a joint-correction technology for receiving and transmitting channels between RRUs, and the channel-response difference of each transceiver channel of the RRU can be compensated in the time domain and the frequency domain by the joint-correction technology of the transceiver channels between the RRUs. Obtain the BF array gain. The distributed base station equipment is mainly divided into two parts: a baseband unit (BBU) and an RRU. The technical feature of the BBU+RRU is to divide the base station into a near-end machine, that is, a wireless baseband control (Radio Server) and a remote unit, that is, a radio remote. (RRU) two parts, one BBU can support multiple RRUs, and the BBU and RRU are generally connected by optical fiber, and the interface is open.

In the technical scenario of the BBU+RRU shown in FIG. 1, the RRU0 and RRU1 transceiver channels include TX0, RX0, TX1, and RX1, where TX is a Transmitter and RX is a Receiver. With the prior art, RRU0 can implement its own transceiver channel correction, and RRU1 can also implement its own transceiver channel correction. However, since RRU0 and RRU1 have independent correction reference channels, the channel responses of the two calibration reference channels are not equal. The four transceiver channels of RRU0 and RRU1 cannot achieve the delay and phase consistency on the air interface, and thus the joint correction between the RRU0 and RRU1 cannot be achieved. The technical solution provided by the embodiment of the present invention can obtain a correction signal, and further perform joint correction of the transmission and reception channels between the RRUs through the obtained correction signal.

Embodiment 1

As shown in FIG. 2, an embodiment of the present invention provides a method for determining a correction signal, including:

S201. The BBU obtains a first received power from the first RRU, where the first received power is a power when the first RRU receives the first signal sent by the second RRU.

S202. When the comparison result between the first received power and the power threshold does not meet the preset condition, the BBU adjusts the first signal to obtain the second signal, and determines the second received power according to the second signal. The second received power is the first RRU. The power when receiving the second signal, the comparison result of the second received power and the power threshold satisfies a preset condition;

S203. The BBU uses the second signal as a correction signal, and the correction signal is used for joint correction of the transceiver channel between the first RRU and the second RRU.

In this embodiment, the method for performing joint correction of the first RRU and the second RRU for the transceiver channel mainly includes: determining, by the BBU, the channel estimation hc1 of the first RRU and the channel estimation hc2 of the second RRU, respectively; obtaining the mutual correction coefficient rc=hc1/hc2 And using the mutual correction coefficient rc to update the transmission correction coefficient or the reception correction coefficient of the first RRU, thereby implementing joint correction of the transmission and reception channels between the first RRU and the second RRU.

The method for the BBU to determine the channel estimation hc1 of the first RRU includes:

The BBU controls the reference price reference channel of the first RRU to be in the received signal state, and the second RRU transmits a signal to the first RRU (the signal corresponds to the first signal in FIG. 2), and the second RRU corresponding correction is obtained by the method shown in FIG. The signal then determines a channel estimate hc1, hc1 of the first RRU, which is a channel estimate when the first RRU receives the correction signal transmitted by the second RRU through the reference channel.

The method for the BBU to determine the channel estimate hc2 of the second RRU is the same as the method for the BBU to determine the channel estimate hc1 of the first RRU, except that the first RRU is exchanged with the second RRU in the method for determining the channel estimate hc1 of the first RRU by the BBU. Specifically include:

The BBU controls the reference price reference channel of the second RRU to be in a received signal state, the first RRU transmits a signal to the second RRU (the signal corresponds to the first signal in FIG. 2), and the signal transmitted by the first RRU may be transmitted with the second RRU. The signals are the same or different, and the correction signal corresponding to the first RRU is obtained by the method shown in FIG. 2, and then the channel estimation hc2 of the second RRU is determined, and hc2 is when the second RRU receives the correction signal of the first RRU transmission through the reference channel. Channel estimation.

In this embodiment, according to different preset conditions, when the comparison result of the first received power and the power threshold does not satisfy the preset condition in the S202, the method for the BBU to adjust the first signal to obtain the second signal may include the following:

1. When the first received power is greater than or equal to the first power threshold, it indicates that the first received power is too large, which may cause the AGC to start control. The BBU needs to adjust the first signal to adjust the first received power, so that the adjustment is obtained. The second received power is smaller than the first power threshold, and the first power threshold may be set according to the input antenna power of the first RRU, and the AGC start control may be caused when the received power is greater than or equal to the first power threshold. The method for the BBU to adjust the first signal to obtain the second signal may include the following:

Method 1: The BBU multiplies the first signal S(k) by the frequency domain.

Obtaining a second signal, where the second received power corresponding to the second signal is less than the first power threshold. Where k represents the frequency domain subcarrier number of the first signal, Delta represents the digital power control coefficient, Delta satisfies Delta=f(yx)+A, f() represents the up-rounding function, y represents the first received power, and x represents The first power threshold, A is a constant.

A can be flexibly set. Since the first receiving power is relatively large, the AGC start control is triggered to avoid signal distortion caused by ADC saturation, but the AGC start control causes a channel response change. In this embodiment, the value of A is set to avoid triggering the AGC start control.

For example, assume that the first power threshold corresponding to the first signal is -30 dBm, the first received power is -20 dBm, the value of A is 6 dB, and Delta=f(yx)+A=16 dB.

Since the first received power -20 dBm is greater than the first power threshold -30 dBm, if the first signal S(k) is multiplied

The corresponding first received power is 0.1585^2, 10*log10(0.1585^2)=16dB, that is, the first signal S(k) is multiplied by

The first received power is attenuated by 16 dB. The first received power is attenuated by 16dB and is -20dBm-16=-36dBm, which is less than the first power threshold of -30dBm. Therefore, the second signal is multiplied by the first signal S(k).

After the value, the second received power is -36 dBm after the first received power is attenuated by 16 dB, that is, the BBU uses the second signal as a correction signal.

Method 2: The BBU multiplies the first signal S(n) by the time domain.

Obtaining a second signal, where the second received power corresponding to the second signal is less than the first power threshold. Where n represents the time domain sample number of the first signal, Delta represents the digital power control coefficient, the Delta satisfies Delta=f(yx)+A, f() represents the up-rounding function, and y represents the first received power, x Indicates the first power threshold, A is a constant, and the value of A can be set according to the condition to avoid triggering the AGC start control.

Method 3: The purpose of adjusting the first received power is achieved by performing frequency domain shift on the first signal by time domain shift. Specifically, the BBU shifts the first signal to the right in the time domain or the frequency domain to obtain a second signal, where the second received power corresponding to the second signal is smaller than the first power threshold, and the first signal is shifted by one bit to the right. The second received power is reduced by 6 dB with respect to the first received power. The time domain shift can better guarantee the accuracy of the phase with respect to the frequency domain shift.

For example, the first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power. Similarly, the first signal is shifted by two bits to the right, and the second received power is relative to the first. Receive power is reduced by 12dB, and so on. Assume that the first power threshold is -30 dBm, the first received power is -20 dBm, the difference between the first received power and the first power threshold is equal to 10 dBm, and is rounded up to an integer multiple of 6 dBm, that is, the difference needs to be adjusted to 12 dBm. Therefore, the second received power needs to be reduced by 12 dBm with respect to the first received power, that is, the first signal is shifted to the right by two bits in the time domain or the frequency domain.

2. When the first received power is less than or equal to the second power threshold, indicating that the first received power is too small, the BBU needs to adjust the first received power to adjust the first received power, so that the adjusted second received power is greater than The second power threshold, the second power threshold can be set according to the signal noise power. The method for the BBU to adjust the first signal to obtain the second signal is as follows:

The BBU shifts the first signal to the left in the time domain or the frequency domain to obtain a second signal, where the second received power corresponding to the second signal is greater than the second power threshold, and the first signal is shifted to the left by one bit, and the second signal The received power is increased by 6 dB with respect to the first received power.

For example, the first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power. Similarly, the first signal is shifted by two bits to the left, and the second received power is relative to the first. A receive power is increased by 12 dB, and so on. Assuming that the first power threshold is -30 dBm, the first received power is -35 dBm, the difference between the first power threshold and the first received power is equal to 5 dBm, and is rounded up to an integer multiple of 6 dBm, that is, the difference needs to be adjusted to 6 dBm. Therefore, the second received power needs to be increased by 6 dBm with respect to the first received power, that is, the first signal is shifted to the right by one bit in the time domain or the frequency domain.

3. When the first received power is less than or equal to the second power threshold, indicating that the first received power is too small, the BBU needs to adjust the first received power to adjust the first received power, so that the adjusted second received power is greater than The third power threshold, where the second received power is the power when the first RRU receives the subcarrier of the second signal. The method for the BBU to adjust the first signal to obtain the second signal is as follows:

The signal strength of each subcarrier of the first signal is increased by frequency division. The BBU interleaves the subcarriers of the first signal to obtain a second signal, where the second received power corresponding to the second signal is greater than the third power threshold, and the second received power is the power when the first RRU receives the subcarrier of the second signal.

For example, when the first signal is equivalent to the noise power, such as -97dBm@20MHz bandwidth (the noise figure is calculated by 4dB), if the first received power is less than or equal to the second power threshold, the first signal needs to be amplified, in order to avoid If the power amplifier is burned, it is still necessary to ensure that the total power does not change in an Orthogonal Frequency Division Multiple Access (OFDMA) symbol. Therefore, the method of spacing the subcarriers of the first signal can be used only to improve the The power of each subcarrier of a signal. For example, the subcarrier label k of the first signal is continuous, and the subcarrier of the first signal is placed at a position of 2k to obtain a second signal, and the second received power is increased by 3 dBm with respect to the first received power; similarly, The subcarrier of the first signal is placed at a position of 4k to obtain a second signal, the second received power is increased by 6 dBm with respect to the first received power, and so on. In the time domain, k denotes a time domain sample label within one OFDM symbol, and k in the frequency domain denotes a subcarrier label within one OFDM symbol.

In this embodiment, in order to avoid damage to the receiving channel of the first RRU due to excessive power of the second RRU transmitting the first signal, the power A of the first RR transmitting the first signal for the first time satisfies the following conditions:

A+x–PL+x<T

Namely: A<T+PL–2*x

Where x represents the antenna gain and T represents the power threshold of the RRU's receive channel corruption, ie When the received power of the RRU receiving the first signal is greater than T, the receiving channel of the first RRU is damaged; PL represents the free space loss, PL=20lg(F)+20lg(D)+32.4, F represents the frequency, F The unit is MHz, and D represents the distance between the first RRU and the second RRU, and the unit of D is Km.

If the rated transmit power of the second RRU is Pt, the second RRU may reduce the power of transmitting the first signal by at least Delta_f=Pt-(T+PL-2*x), the unit of Delta_f before first transmitting the first signal. For the second RRU, the second RRU may be used to reduce the rated transmit power by using the second RRU to adjust the first signal to obtain the second signal, so as to avoid excessive power transmission of the first signal by the second RRU. The receiving channel of the first RRU is damaged.

In the above embodiments. Adjusting the received power by adjusting the transmit signal, so that the received power meets the preset condition, and avoids the AGC start control. At this time, the adjusted signal can be used as a correction signal for joint correction of the transceiver channel between the RRUs.

For example, in conjunction with the scenario shown in FIG. 1, as shown in FIG. 3, the joint correction process of the transceiver channel between RRUs provided by the embodiment of the present invention is as follows:

S301. The first RRU and the second RRU respectively perform respective transceiver channel corrections, and respectively obtain respective correction coefficients.

The correction factor of the first RRU includes

with

a correction factor indicating the ith transmission channel of the first RRU,

a correction coefficient indicating an ith receiving channel of the first RRU; a correction coefficient of the second RRU includes

with

a correction factor indicating the ith transmission channel of the second RRU,

A correction coefficient indicating the ith receiving channel of the second RRU. The RCU's respective transceiver channel correction process is prior art and will not be described here.

S302. The BBU controls the reference price reference channel of the first RRU to be in a received signal state, and the BBU controls the second RRU to use the reference reference channel to transmit the first signal to the first RRU at a rated power.

Select channel 0 as the reference reference channel.

S303. The BBU obtains a first received power from the first RRU, where the first received power is a power when the first RRU receives the first signal sent by the second RRU.

S304. The BBU determines whether the comparison result of the first received power and the power threshold meets a preset condition.

When the comparison result of the first received power and the power threshold does not satisfy the preset condition, S305 is performed. Specifically, when the first received power is greater than or equal to the first power threshold, S305 is performed; or when the first received power is less than or equal to the second power threshold, S305 is performed.

When the comparison result of the first received power and the power threshold satisfies the preset condition, S306 is performed. Specifically, when the first received power is less than the first power threshold and the first received power is greater than the second power threshold, S306 is performed.

S305. The BBU adjusts the first signal to obtain a second signal, and determines a second received power according to the second signal, and uses the second signal as a correction signal that is sent by the second RRU.

The second received power is the power when the first RRU receives the second signal, and the comparison result of the second received power and the power threshold satisfies a preset condition. Specifically, the method for the BBU to adjust the first signal to obtain the second signal and determine the second received power according to the second signal is as described above in the embodiment, and details are not described herein again.

S306. The BBU uses the first signal as a correction signal that is sent by the second RRU.

S307, the BBU controls the first RRU to receive the correction signal of the second RRU transmission by referring to the reference channel, and calculates the channel estimation hc1 of the first RRU at this time;

The channel estimate hc1 of the first RRU is equal to

versus

Product of

Indicates the channel response of the receiving channel of the first RRU,

Indicates the channel response of the transmit channel of the first RRU.

Repeat the above steps to obtain the channel estimate hc2 of the second RRU, as follows:

S308. The BBU controls the reference price reference channel of the second RRU to be in a received signal state, and the BBU controls the first RRU to use the reference reference channel to transmit the first signal to the second RRU by using the rated power.

S309. The BBU acquires a first received power from a second RRU, where the first received power is a power when the second RRU receives the first signal sent by the first RRU.

S310. The BBU determines whether the comparison result of the first received power (corresponding to the second RRU) and the power threshold meets a preset condition.

When the comparison result of the first received power and the power threshold does not satisfy the preset condition, S311 is performed. Specifically, when the first received power is greater than or equal to the first power threshold, S311 is performed; or when the first received power is less than or equal to the second power threshold, S311 is performed.

When the comparison result of the first received power and the power threshold satisfies the preset condition, S312 is performed. Specifically, when the first received power is less than the first power threshold and the first received power is greater than the second power threshold, S312 is performed.

S311, the BBU adjusts the first signal to obtain a second signal, and determines a second received power according to the second signal, and uses the second signal as a correction signal that is sent by the first RRU;

The second received power is the power when the second RRU receives the second signal, and the comparison result of the second received power and the power threshold satisfies a preset condition. Specifically, the method for the BBU to adjust the first signal to obtain the second signal and determine the second received power according to the second signal is as described above in the embodiment, and details are not described herein again.

S312. The BBU uses the first signal as a correction signal that is sent by the first RRU.

S313, the BBU controls the second RRU to receive the correction signal of the first RRU transmission by using the reference reference channel, and calculates the channel estimation hc2 of the second RRU at this time;

The channel estimate hc2 of the second RRU is equal to

versus

Product of

Indicates the channel response of the receiving channel of the second RRU,

Indicates the channel response of the transmit channel of the second RRU.

S314, the BBU determines the mutual correction coefficient rc=hc1/hc2;

S315, the BBU updates the correction coefficient of the first RRU by using the mutual correction coefficient rc, and the correction coefficient of the second RRU remains unchanged; or the BBU updates the correction coefficient of the second RRU by using the mutual correction coefficient rc, and the correction coefficient of the first RRU remains unchanged. change.

Specifically, the correction coefficient of the second RRU remains unchanged, and the correction coefficient of the updated ith transmission channel of the first RRU

Meet the following formula:

Correction coefficient of the updated i-th receiving channel of the first RRU

Meet the following formula:

or

The correction coefficient of the first RRU remains unchanged, and the correction coefficient of the updated ith transmission channel of the second RRU

Meet the following formula:

Correction coefficient of the updated i-th receiving channel of the second RRU

Meet the following formula:

In the embodiment of the present invention, the BBU obtains the first received power from the first RRU, and the first received power is the power when the first RRU receives the first signal sent by the second RRU; when the comparison between the first received power and the power threshold is not When the preset condition is met, the BBU adjusts the first signal to obtain the second signal, and determines the second received power according to the second signal; the second received power is the power when the first RRU receives the second signal, and the second received power and power threshold The comparison result satisfies the preset condition; the BBU uses the second signal as a correction signal, and the correction signal is used for joint correction of the first RRU and the second RRU for transmitting and receiving channels. Since the correction signal obtained by adjusting the transmission signal of the BBU satisfies the preset condition, the channel response change caused by the AGC start control triggered by the excessive correction signal can be avoided, and the correction signal can be used to jointly correct the transmission and reception channels between the RRUs. Therefore, according to the technical solution provided by the embodiment of the present invention, the joint correction of the transceiver channel between the RRUs can still be implemented without the AGC starting control.

Embodiment 2

Based on the above embodiment, the present invention further provides a correction signal determining apparatus, which may adopt the method provided by the embodiment corresponding to FIG. 2, as shown in FIG. 4, the apparatus 400 includes a transceiver unit 401 and a processing unit 402.

The transceiver unit 401 is configured to acquire a first received power, where the first received power is a power when the first remote radio unit RRU receives the first signal sent by the second RRU;

The processing unit 402 is configured to: when the comparison result of the first received power and the power threshold determined by the transceiver unit 401 does not satisfy the preset condition, adjust the first signal to obtain the second signal, and determine the second received power according to the second signal; The received power is the power when the first RRU receives the second signal, and the second connection The comparison result between the received power and the power threshold satisfies a preset condition; the second signal is used as a correction signal, and the correction signal is used for joint correction of the first RRU and the second RRU for transmitting and receiving channels.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the first signal is obtained by the processing unit 402, the processing unit 402 is specifically configured to:

Multiplying the first signal S(k) in the frequency domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is smaller than a first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

Multiplying the first signal S(n) in the time domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is less than a first power threshold, and n represents a time domain sample sequence number of the first signal;

Delta represents the digital power control coefficient, Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the first signal is obtained by the processing unit 402, the processing unit 402 is specifically configured to:

When the first received power is greater than or equal to the first power threshold, the first signal is shifted to the right in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is smaller than the first power threshold. The first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power.

Optionally, the first power threshold is set according to the input antenna power of the first RRU.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the condition, when the processing unit 402 adjusts the first signal to obtain the second signal, specifically:

When the first received power is less than or equal to the second power threshold, the subcarriers of the first signal are intermittently placed to obtain a second signal, and the second received power corresponding to the second signal is greater than a third power threshold, and the second received power is The power when an RRU receives the subcarriers of the second signal.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processing unit 402 adjusts the first signal to obtain the second signal, specifically:

When the first received power is less than or equal to the second power threshold, the first signal is shifted to the left in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is greater than the second power threshold. The first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.

Optionally, the second power threshold is set according to signal noise power.

It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

An integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

Based on the above embodiments, the present invention also provides a correction signal determining apparatus, which may employ the method provided by the embodiment corresponding to FIG. 2, and may be the same device as the apparatus shown in FIG. Referring to FIG. 5, the apparatus 500 includes a transceiver 501, a processor 502, a bus 503, and a memory 504, wherein:

The transceiver 501, the processor 502, and the memory 504 are connected to each other through a bus 503. The bus 503 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. Wait. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, Figure 5 Only one thick line is used, but it does not mean that there is only one bus or one type of bus.

The transceiver 501 is configured to acquire a first received power, where the first received power is a power when the first remote radio unit RRU receives the first signal sent by the second RRU;

The processor 502 is configured to: when the comparison result of the first received power and the power threshold determined by the transceiver 501 does not satisfy the preset condition, adjust the first signal to obtain the second signal, and determine the second received power according to the second signal; The received power is the power when the first RRU receives the second signal, and the comparison result of the second received power and the power threshold satisfies a preset condition; the second signal is used as a correction signal, and the correction signal is used for the first RRU and the second RRU. The transceiver channel is jointly corrected.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processor 502 adjusts the first signal to obtain the second signal, the processor 502 is specifically configured to:

Multiplying the first signal S(k) in the frequency domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is smaller than a first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

Multiplying the first signal S(n) in the time domain when the first received power is greater than or equal to the first power threshold

Obtaining a second signal, where a second received power corresponding to the second signal is less than a first power threshold, and n represents a time domain sample sequence number of the first signal;

Delta represents the digital power control coefficient, Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.

Optionally, when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processor 502 adjusts the first signal to obtain the second signal, the processor 502 is specifically configured to:

When the first received power is greater than or equal to the first power threshold, the first signal is shifted to the right in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is smaller than the first power threshold. The first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power.

Optionally, the first power threshold is set according to the input antenna power of the first RRU.

Optionally, when the comparison result between the first received power and the power threshold does not satisfy the condition, the processor When the 502 adjusts the first signal to obtain the second signal, it is specifically used to:

When the first received power is less than or equal to the second power threshold, the subcarriers of the first signal are intermittently placed to obtain a second signal, and the second received power corresponding to the second signal is greater than a third power threshold, and the second received power is The power when an RRU receives the subcarriers of the second signal.

Optionally, when the comparison result between the first received power and the power threshold does not satisfy the preset condition, when the processor 502 adjusts the first signal to obtain the second signal, specifically:

When the first received power is less than or equal to the second power threshold, the first signal is shifted to the left in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal is greater than the second power threshold. The first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.

Optionally, the second power threshold is set according to signal noise power.

The apparatus 500 also includes a memory 504 for storing programs and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 504 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage. The processor 502 executes an application stored in the memory 504 to implement the above-described correction signal determining method.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device to produce a machine that enables Instructions executed by a processor of a computer or other programmable data processing device generate means for implementing the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The instruction device implements the functions specified in one or more blocks of the flowchart or in a flow or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the scope of the embodiments of the present invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims (14)

1. A method for determining a correction signal, comprising:

   The baseband unit BBU acquires a first received power from the first radio remote unit RRU, where the first received power is a power when the first RRU receives the first signal transmitted by the second RRU;

   When the comparison result of the first received power and the power threshold does not satisfy the preset condition, the BBU adjusts the first signal to obtain a second signal, and determines a second received power according to the second signal; The received power is the power when the first RRU receives the second signal, and the comparison result of the second received power and the power threshold meets a preset condition;

   The BBU uses the second signal as a correction signal, and the correction signal is used for performing joint correction of the transceiver channel between the first RRU and the second RRU.
2. The method according to claim 1, wherein when the comparison result of the first received power and the power threshold does not satisfy the preset condition, the BBU adjusts the first signal to obtain a second signal, including:

   When the first received power is greater than or equal to a first power threshold, the BBU multiplies the first signal S(k) by a frequency domain

   

   Obtaining a second signal, where the second received power corresponding to the second signal is smaller than the first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

   When the first received power is greater than or equal to the first power threshold, the BBU multiplies the first signal S(n) by the time domain.

   

   Obtaining a second signal, where the second received power corresponding to the second signal is smaller than the first power threshold, and n is a time domain sample sequence number of the first signal;

   Delta represents the digital power control coefficient, the Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.
3. The method according to claim 1, wherein when the comparison result of the first received power and the power threshold does not satisfy the preset condition, the BBU adjusts the first signal to obtain a second signal, including:

   When the first received power is greater than or equal to a first power threshold, the BBU is in a time domain or frequency The first signal is shifted to the right to obtain a second signal, and the second received power corresponding to the second signal is smaller than the first power threshold, and the first signal is shifted by one bit to the right. The second received power is reduced by 6 dB with respect to the first received power.
4. The method of claim 2 or 3, wherein the first power threshold is set according to an input antenna power of the first RRU.
5. The method according to claim 1, wherein when the comparison result of the first received power and the power threshold does not satisfy the condition, the BBU adjusts the first signal to obtain a second signal, including:

   When the first received power is less than or equal to the second power threshold, the BBU intermittently places the subcarriers of the first signal to obtain a second signal, where the second received power of the second signal is greater than the third a power threshold, where the second received power is a power when the first RRU receives a subcarrier of the second signal.
6. The method according to claim 1, wherein when the comparison result of the first received power and the power threshold does not satisfy the preset condition, the BBU adjusts the first signal to obtain a second signal, including:

   When the first received power is less than or equal to the second power threshold, the BBU shifts the first signal to the left in the time domain or the frequency domain to obtain a second signal, where the second signal corresponds to the second signal The second received power is greater than the second power threshold, the first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.
7. The method of claim 6 wherein said second power threshold is set based on signal noise power.
8. A correction signal determining device, comprising:

   a transceiver unit, configured to acquire a first received power, where the first received power is a power when the first radio remote unit RRU receives the first signal sent by the second RRU;

   a processing unit, configured to: when the comparison result of the first received power and the power threshold determined by the transceiver unit does not satisfy a preset condition, adjust the first signal to obtain a second signal, and determine, according to the second signal, a second received power; the second received power is the first RRU receiving the first The power of the two signals, the comparison result of the second received power and the power threshold satisfies a preset condition; the second signal is used as a correction signal, and the correction signal is used for the first RRU and the second RRU Perform joint correction of the transceiver channel.
9. The apparatus according to claim 8, wherein when the comparison result of the first received power and the power threshold does not satisfy a preset condition, the processing unit adjusts the first signal to obtain a second signal, Specifically used for:

   Multiplying the first signal S(k) in the frequency domain when the first received power is greater than or equal to the first power threshold

   

   Obtaining a second signal, where the second received power corresponding to the second signal is smaller than the first power threshold, and k represents a frequency domain subcarrier sequence number of the first signal; or

   Multiplying the first signal S(n) by the time domain when the first received power is greater than or equal to the first power threshold

   

   Obtaining a second signal, where the second received power corresponding to the second signal is smaller than the first power threshold, and n is a time domain sample sequence number of the first signal;

   Delta represents the digital power control coefficient, the Delta satisfies Delta=f(y-x)+A, f() represents the up-rounding function, y represents the first received power, x represents the first power threshold, and A is a constant.
10. The apparatus according to claim 8, wherein when the comparison result of the first received power and the power threshold does not satisfy a preset condition, the processing unit adjusts the first signal to obtain a second signal, Specifically used for:

    When the first received power is greater than or equal to the first power threshold, the first signal is shifted to the right in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal Less than the first power threshold, the first signal is shifted by one bit to the right, and the second received power is reduced by 6 dB with respect to the first received power.
11. The apparatus of claim 9 or 10, wherein the first power threshold is set according to an input antenna power of the first RRU.
12. The apparatus according to claim 8, wherein when the comparison result of the first received power and the power threshold does not satisfy the condition, the processing unit adjusts the first signal to obtain a second signal, specifically for :

    When the first received power is less than or equal to the second power threshold, the subcarriers of the first signal are intermittently placed to obtain a second signal, and the second received power corresponding to the second signal is greater than a third power threshold. The second received power is a power when the first RRU receives a subcarrier of the second signal.
13. The device according to claim 8, wherein when the comparison result of the first received power and the power threshold does not satisfy the preset condition, when the processing unit adjusts the first signal to obtain the second signal, Used for:

    When the first received power is less than or equal to the second power threshold, shifting the first signal to the left in the time domain or the frequency domain to obtain a second signal, and the second received power corresponding to the second signal Greater than the second power threshold, the first signal is shifted by one bit to the left, and the second received power is increased by 6 dB with respect to the first received power.
14. The apparatus of claim 13 wherein said second power threshold is set based on signal noise power.

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