WO2014173207A1 - Automatic gain control method and device for receive channel - Google Patents

Abstract

Disclosed are an automatic gain control (AGC) method and device for a receive channel. The method comprises: a receive end receiving a signal from a transmit end, each timeslot of the signal comprising an automatic gain control training (AGCT) period and a data PDATA period, the AGCT period comprising a training signal for performing AGC, and the PDATA period comprising data content; and the receive end performing AGC for a receive channel in a local timeslot by using the training signal used for performing the AGC and carried in the AGCT period.

Description

 Receiving channel gain automatic control method and device

 This application claims priority to Chinese Patent Application No. 201310148944.9, entitled "Automatic Control Method and Apparatus for Receiving Channel Gain", filed on April 26, 2013, the entire contents of which are incorporated herein by reference. In this application. Technical field

 The present invention relates to the field of communications technologies, and in particular, to a receiving channel gain automatic control method and apparatus. Background technique

 Technical features of the Internet of Vehicles based on TDMA (Time Division Multiple Access) technology include: (1) GNSS (Global Navigation Satellite System) synchronization between vehicles. Time slots are divided based on GNSS timing. Each vehicle occupies a time slot resource of one time slot, and different users use different time slots. (2) Receive signals using two antennas. (3) When the vehicle sends information, the range to be covered is up to 300 meters, the nearest distance of the neighboring car is 2 meters, and the dynamic range of the received signal is large. (4) Due to the mobility of the car and the rapid change of the network topology, it is impossible to predict the near and far information of a certain time slot. That is, the possible received signal power cannot be known before receiving a certain time slot. In addition, it is necessary to use the received signal of one time slot to complete the receive channel gain adjustment and signal detection functions. Summary of the invention

 Embodiments of the present invention provide a method and a device for automatically controlling a gain of a receiving channel, so as to ensure that the gain of the receiving channel can be quickly adjusted when the power of the received signal changes rapidly.

In order to achieve the above object, an embodiment of the present invention provides a method for automatically controlling a gain of a receiving channel, where the method includes: The receiving end receives a signal from the transmitting end, where each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period; wherein the AGCT period includes a training signal for performing automatic gain control AGC, The data content is included in the PDATA period;

 The receiving end performs automatic control of the receiving channel gain of the time slot by using the training signal for performing AGC carried in the AGCT period.

 An embodiment of the present invention provides a method for automatically controlling a gain of a receiving channel, the method comprising: generating, by a transmitting end, a signal that needs to be sent to a receiving end, where each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period, The training signal for performing automatic gain control AGC is included in the AGCT period, and the data content is included in the PDATA period;

 The transmitting end sends the signal to the receiving end, and the receiving end performs automatic control of the receiving channel gain of the current time slot by using the training signal for performing AGC carried in the AGCT period.

 An embodiment of the present invention provides a receiving end, where the receiving end includes:

 a receiving module, configured to receive a signal from the transmitting end, where each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period; the AGCT period includes a training signal for performing automatic gain control AGC, The data content is included in the PDATA period;

 And a control module, configured to perform automatic control of receiving channel gain of the time slot by using a training signal carried in the AGCT period for performing AGC.

 An embodiment of the present invention provides a sending end, where the sending end includes:

And a generating module, configured to generate a signal that needs to be sent to the receiving end, where each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period, and the AGCT period includes a training signal for performing automatic gain control AGC, PDATA Included in the time period Data content

 And a sending module, configured to send the signal to the receiving end, where the receiving end uses the training signal carried in the AGCT period for performing AGC to perform automatic control of the receiving channel gain of the current time slot.

 Compared with the prior art, the embodiment of the present invention has at least the following advantages: In the embodiment of the present invention, by carrying the training signal for performing AGC in the AGCT (Automatic Gain Control Training) period of the signal, The receiving end can automatically control the receiving channel gain of the current time slot by using the training signal carried in the AGC period for performing AGC, so that when the received signal power changes rapidly, the receiving channel gain can be quickly adjusted to adapt to the change of the received signal power. Further, the receiving channel gain adjustment delay of each time slot can be compressed to a large extent, and the frequency efficiency and the transmission delay are obviously improved, which can meet the requirements of the Internet of Vehicles. DRAWINGS

 In order to more clearly illustrate the technical solutions of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

 1 is a schematic flow chart of a method for automatically controlling a gain of a receiving channel according to an embodiment of the present invention;

 2 and 3 are structural diagrams of a time slot including a GP period, an AGCT period, and a PDATA period, respectively;

 4 is a schematic structural diagram of a receiving end according to an embodiment of the present invention;

 FIG. 5 is a schematic structural diagram of a transmitting end according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another receiving end according to an embodiment of the present disclosure; FIG. 7 is a schematic structural diagram of another transmitting end according to an embodiment of the present invention. detailed description

D2D (Device to Device) communication in the LTE (Long Term Evolution) cellular network. The D2D terminal needs to maintain two sets of links at the same time, that is, the traditional D2N (Device to Network) chain. Road and D2D links. If the resources of the two links need to be time-multiplexed, the D2D terminal needs to save the AGC (Automatic Gain Control) gain value of the D2N link and switch from D2D to D2D before switching from D2N to D2D. At D2N, the previously saved AGC gain value is restored. Due to the mobility of the D2D terminal, the distance between the two D2D terminals is uncertain. For the D2D terminal on the receiving side, since the received signal power is rapidly changing, the D2D terminal cannot know the possible received signal power.

 In the vehicle networking communication based on TDM technology and the D2D communication in the LTE cellular network, the receiving end cannot know the possible received signal power (that is, the received signal power cannot be predicted) due to the rapid change of the received signal power. When the received signal power changes rapidly, the receiving channel gain is required to be quickly adjusted to accommodate changes in the received signal power. Currently, there is no way to adjust the channel gain to accommodate varying received signal power.

In an Adhoc (Peer-to-Peer) wireless ad hoc network, the transmit power of each node is determined according to the range that the node needs to cover. The larger the coverage of a node, the stronger the node's transmit power. Typically, a self-organizing communication network includes a plurality of nodes that are randomly located. The receiving node received signal power differs with the distance from the transmitting node and the radio wave propagation environment. The transmitting node is close to the receiving node, and the receiving power is strong. The transmitting node is far away from the receiving node, and the receiving power is weak. Therefore, for each node, the dynamic range of received signal power is relatively large. The greater the node transmit power, the greater the dynamic range of the node's received signal. If the dynamic range exceeds a certain value, the node will not receive the signal correctly. Introduced at this time The problem of the node receiving the AGC is to control the gain of the receiving channel.

 For the Adhoc wireless ad hoc network, each node transmits a signal within a specified time (called a time slot), and the remaining related nodes need to receive the transmitted signal of the node during that time (the time slot). For a node, signals received in multiple consecutive time slots are sent by different nodes. The distances of the nodes transmitting these signals from the node are randomly distributed, and the magnitude of the received power is also randomly distributed, and the dynamic range is relatively large. The conventional automatic control method for receiving channel gain is to adjust the gain of the receiving channel of the subsequent time slot by using the signal power received in the previous time slot.

 In the receive channel gain adjustment strategy of a centralized scheduling network (e.g., cellular network), the current channel data cannot be used to simultaneously adjust the receive channel gain and the detection signal. Based on this, in the D2D communication of the cellular network, since the D2D terminal cannot know the possible received signal power, the existing receiving channel gain adjustment strategy cannot be applied to the D2D communication in the cellular network.

 In the receive channel gain adjustment strategy of the ad hoc network, the current slot data cannot be used to simultaneously adjust the receive channel gain and detection signals. Based on this, in the ad hoc network based on the ad hoc network, since the nodes in the ad hoc network structure do not introduce GNSS timing time synchronization, there is no strict time slot, and the receiving end needs to continuously receive and receive signals, adjust the receiving channel gain, and complete the sliding. Related to find the starting location for sending data. This kind of networking structure has low transmission efficiency and large transmission delay, and is not suitable for application in the vehicle network. Therefore, the existing receiving channel gain adjustment strategy cannot be applied to the vehicle network.

 In summary, in the TDMA-based vehicle networking communication and the D2D communication in the LTE cellular network, the receiving end cannot know the possible received signal power (i.e., the received signal power cannot be predicted) due to the rapid change of the received signal power. When the received signal power changes rapidly, the receiving channel gain needs to be quickly adjusted to accommodate changes in the received signal power. Currently, there is no way to adjust the channel gain to accommodate varying received signal power.

In view of the problems existing in the prior art, the embodiment of the present invention provides a receiving channel increase. Benefit automatic control methods and equipment. By carrying the training signal for performing AGC in the AGCT period of the signal, the receiving end can automatically control the receiving channel gain of the current slot by using the training signal carried in the AGCT period for performing the AGC, so that the received signal power is fast. When changing, the gain of the receiving channel can be quickly adjusted to adapt to the adjustment delay of the receiving channel gain of the variable time slot of the received signal power, and the frequency efficiency and the transmission delay are obviously improved, which can meet the requirements of the Internet of Vehicles.

 In the Adhoc ad hoc network, the embodiment of the invention provides a method for automatically controlling the receiving channel gain. The method can be applied to an application scenario in which the received signal power changes rapidly and the receiving end cannot know the possible received signal power. For example, current TDMA-based car networking communication scenarios and D2D communication scenarios based on LTE cellular networks. As shown in Figure 1, the method includes the following steps.

 Step 101: The transmitting end generates a signal that needs to be sent to the receiving end, and each time slot of the signal includes an AGCT period and a PDATA (data) period. The AGCT period includes a training signal for performing an AGC, and the PDATA period includes data content.

 In the embodiment of the present invention, the training signal for performing AGC carried in the AGCT period is generated by using a short sequence cyclic shift spreading sequence length. In addition, each time slot of the signal may also include a GP (Guard Period) period.

 The length of one slot of the physical layer is 1 ms, and the length of the slot is divided into a GP period, an AGCT period, and a PDATA period. In an embodiment of the embodiment of the present invention, the structure of one time slot including the GP period, the AGCT period, and the PDATA period may be as shown in FIG. 2. The numerical values in the figures are exemplary values, and the scope of protection of the embodiments of the present invention is not limited to these examples.

(1) The length of the GP period is 31us, which is used to protect the time slot signal. The GP period is used to protect the receiver transmission delay, the receiving switch switching delay, and the time slot caused by the receiver synchronization error. The boundary is blurred and the delay of the signal sent by other nodes in the previous time slot in the coverage arrives. Further, the length design of the GP period needs to consider the coverage of the ad hoc network, and the GP period is used to avoid interference signals from other transmitting nodes beyond the design coverage.

 (2) The length of the AGCT period is 112us, which is used as the training signal for automatic gain control. The relevant description of the AGCT period will be elaborated in the subsequent process.

 (3) The PDATA period occupies the time-frequency resource after the GP period and the AGCT period, which is used for data content transmission. The sum of the lengths of the GP period and the AGCT period is 143 us.

 Step 102: The transmitting end sends a signal to the receiving end, and the receiving end receives the signal from the transmitting end. Each time slot of the signal includes a GP period, an AGCT period, and a PDATA period. The AGCT period includes a training signal for performing an AGC, and the PDATA period includes data content.

 Step 103: The receiving end performs automatic control of the receiving channel gain of the time slot by using the training signal carried in the AGC period for performing AGC.

 In this embodiment, the receiving end performs the adjustment of the receiving channel gain in the current time slot by using the training signal for performing AGC carried in the AGCT period, to complete the adjustment of the receiving channel gain in the current time slot, and then perform the time slot. Data demodulation and decoding, etc.

In the embodiment of the present invention, the Training sig (training signal) period and the Adjust period are included in the AGCT period. The receiving end uses the training signal for performing AGC carried in the AGCT period to perform automatic control of the receiving channel gain of the time slot. The receiving end calculates the average power of the signal in the Training sig period by using all the received signals in the Training sig period. The received channel gain is calculated by the difference between the average power and the target received signal power (ie, the target power) expected to enter the ADC (Analog to Digital Converter), and the calculated receive channel gain is used in the Adjust. The receiving channel gain of this time slot is adjusted during the period. Wherein, when the difference between the average power and the target received signal power expected to enter the ADC is a negative value, it is necessary to reduce the receiving channel gain. When the average power is When it is desired that the difference between the target received signal powers entering the ADC is positive, the receive channel gain needs to be increased.

 In a preferred embodiment of the embodiment of the invention, the transmitting end first needs to transmit a short sequence in the AGCT period, for example, a short sequence of 17us, and then cyclically shifting to fill the entire AGCT period. That is, the training signal for performing AGC carried in the AGCT period is generated by using the short sequence cyclic shift spread sequence length. The short sequence is mainly used in the embodiment of the present invention to enable the receiving end to take out the complete training sequence multiple times from the AGCT period, thereby bringing greater flexibility to the processing of the receiving end.

 Based on this, in the embodiment of the present invention, the AGCT period may include a plurality of Training sig periods and an Adjust period corresponding to the plurality of Training sig periods, respectively. For example, the AGCT period includes a Training sig_0 period, an Adjust_0 period, a Training sig_l period, an Adjust.1 period, a Training sig_2 period, and an Adjust_2 period. In this case, the total length of the AGCT period will be determined based on the length of the Training sig period, the length of the Adjust period, the number of Training sig periods, and the Adjust period. For example, the total length of the AGCT period is equal to the length of the Training sig_0 period, the length of the Adjust_0 period, the length of the Training sig_l period, the length of the Adjust_l period, the length of the Training sig_2 period, and the length of the Adjust_2 period.

 In the embodiment of the present invention, the length of the Training sig period is determined according to the maximum moving speed of each device in the network. The training sig period length design needs to consider the speed of the nodes in the ad hoc network. The faster the maximum moving speed of the nodes in the self-organizing network, the longer the length of the Training sig period is set. The slower the maximum movement speed of the nodes in the ad hoc network, the shorter the length of the Training sig period is set.

Since the fast motion produces fading, the length of the Training sig period, for example, the length of the Training sig_0 period, the length of the Training sig_l period, the length of the Training sig_2 period, etc., needs to satisfy the fading model. Determine Training sig based on maximum moving speed The length of the time period to ensure that the power calculated during the Training sig period is reliable and available. In the embodiment of the present invention, the length of the Adjust period is determined according to the response speed of the receiving end (such as the receiver) adjusting the gain of the receiving channel. For example, the length of the Adjust_0 period, the length of the Adjust_l period, and the length of the Adjust_2 period depend on the response speed at which the receiver adjusts the gain of the receiving channel.

 In the embodiment of the present invention, the number of Training sig periods and Adjust periods (the number of Training sig periods is the same as the number of Adjust periods) is based on the dynamic range of the network and the receiving end, for example, the ADC of the receiver (Analog to Digital Converter) The dynamic range is acceptable for the converter). The receiving end needs to set multiple Training sig periods and Adjust periods according to the dynamic range of the network and the dynamic range that the receiver's ADC can accept. The more times the receive channel gain needs to be adjusted, the more Training sig periods and Adjust periods that need to be divided.

 When the AGCT period includes a plurality of Training sig periods and an Adjust period corresponding to a plurality of Training sig periods, the receiving end uses the training signal for performing AGC carried in the AGCT period to perform automatic control of the receiving channel gain of the time slot. The method includes: Step A: The receiving end calculates the average power of the signal in the Training sig period by using all the received signals in the first Training sig period, and utilizes the average power in the Training sig period and the target received signal power expected to enter the ADC. The difference between the two is calculated to obtain the gain of the receiving channel.

Step B: The receiving end determines whether the currently calculated receiving channel gain is within a reasonable range of the receiving channel gain; if not, executing step C; if yes, performing step F; wherein the receiving end is pre-configured within a reasonable range Receive channel gain (such as 5db-15db). By comparing the currently calculated receive channel gain with the receive channel gain within a reasonable range, the receiver can determine whether the currently calculated receive channel gain is within the reasonable range of receive channel gain. Step C: The receiving end determines whether there is still a next Training sig period after the current Training sig period; if yes, step D is performed; if not, step G is performed; Step D, the receiving end uses the gain adjustment step at the current Adjusting the receive channel gain of the time slot in the Adjust period corresponding to the training sig period, and then performing step E;

 The receiving end pre-configures the gain adjustment step size, such as: The receiving end configures the gain adjustment step size (the difference between the maximum gain of the receiving channel and the minimum gain of the receiving channel) /2. Further, when there is a next Training sig period, the receiving end may adjust the receiving channel gain of the current slot in the Adjust period corresponding to the current Training sig period by using the pre-configured gain adjustment step.

 Step E: The receiving end calculates the average power of the signal in the next Training sig period by using all the received signals in the next Training sig period, and utilizes the average power in the next Training sig period and the target received signal power expected to enter the ADC. The difference between the two is calculated to obtain the gain of the receiving channel; after step E, step B is performed;

 Step F: The receiving end uses the currently calculated receiving channel gain to adjust the receiving channel gain of the time slot in the Adjust period corresponding to the current Training sig period, and ends the flow; Step G, the receiving end confirms the receiving channel gain of the time slot. The adjustment failed and the process ended. The above process will be further described below in conjunction with the structure of one time slot including the GP period, the AGCT period, and the PDATA period shown in FIG. The length of the GP period is 31us, the length of the AGCT period is 112us, and the AGCT period includes Training sig_0, Adjust_0, Training sig_l, and Adjust_l. Training sig_0 has a length of 35 us, Adjust_0 has a length of 21 us, Training sig_l has a length of 35 us, and Adjust_l has a length of 21 us.

In the above embodiment, the receiving end needs to open the receiving channel, set the gain adjustment step adj_step=y/2, and set the receiving channel gain z=x; where x is the minimum gain of the receiving channel, and y is the maximum gain of the receiving channel The difference between the minimum gain of the receiving channel. In step A, the receiving end calculates the average power of the signal in the Training sig_0 by using all the received signals in the Training sig_0, and compares the average power of the signal in the Training sig_0 with the target power, that is, the target received signal power expected to enter the ADC, Calculate agc_0.

 In step B, the receiving end determines whether agc_0 is a receiving channel gain within a reasonable range; if not, executing step C; if yes, executing step F. In step F, the receiving end adjusts the receiving channel gain of the time slot in Adjust_0 by using agc_0, and ends the flow.

 In step C, the receiving end judges whether there is a next Training sig period after Training sig_0; the judgment result is that there is Training sig_l in the next Training sig period, and step 0 is performed.

 In step D, the receiving end adjusts the receiving channel gain of the time slot in Adjust_0, that is, adjusts the receiving channel gain z=x+adj_step of the time slot, and then performs step E.

 In step E, the receiving end calculates the average power of the signal in the Training sig_1 by using all the received signals in the Training sig_l, and compares the average power of the signal in the Training sig_1 with the target power (ie, the target received signal power expected to enter the ADC). Agc_l, then step B is performed.

 In step B, the receiving end determines whether ag_l is a receiving channel gain within a reasonable range; if not, step C is performed; if yes, step F is performed; and in step F, the receiving end adjusts the value in Adjust_l by using agc_l The receive channel gain of the time slot, and the flow ends.

 In step C, the receiving end judges whether there is a next Training sig period after Training sig_l; the judgment result is that there is no next Training sig period, and step G is performed.

 In step G, the receiving end confirms that the receiving channel gain adjustment of the time slot fails, and the receiving end does not receive the signal sent by the transmitting end in the time slot, and ends the process.

In summary, in the embodiment of the present invention, by carrying in the AGCT period of the signal, The training signal of the AGC is performed, so that the receiving end can automatically control the receiving channel gain of the time slot by using the training signal for performing AGC carried in the AGCT period, so that the receiving channel gain can be quickly adjusted when the received signal power changes rapidly. To adapt to changes in the received signal power. In addition, the receive channel gain adjustment delay of each time slot can be compressed to a large extent, which can improve the frequency efficiency and reduce the transmission delay, thereby meeting the requirements of the Internet of Vehicles.

 Based on the same inventive concept as the above method, the embodiment of the present invention further provides a receiving end. As shown in FIG. 4, the receiving end includes:

 The receiving module 11 is configured to receive a signal from the transmitting end, where each time slot of the signal includes an automatic gain control training (AGCT) period and a data (PDATA) period; the AGCT period includes an automatic gain control AGC Training signal, the data content is included in the PDATA period;

 The control module 12 is configured to perform automatic control of the receiving channel gain of the current time slot by using the training signal for performing AGC carried in the AGCT period.

 The control module 12 is further configured to: when the training signal Training sig period and the Adjust period are included in the AGCT period, calculate an average power of the signal in the Training sig period by using all the received signals in the Training sig period, and pass the The difference between the average power and the target received signal power expected to enter the ADC is calculated to obtain the receive channel gain, and the received channel gain is adjusted within the Adjust period using the calculated receive channel gain.

 The control module 12 is further configured to: when the plurality of Training sig periods and the Adjust period corresponding to the plurality of Training sig periods respectively are included in the AGCT period, perform the following operations:

A. Calculate the average power of the signal in the Training sig period by using all the received signals in the first Training sig period, and utilize the average power in the Training sig period. The difference between the target received signal powers expected to enter the ADC is calculated to obtain the receive channel gain;

B. determining whether the currently calculated receiving channel gain is within a reasonable range of receiving channel gain; if not, executing C; if yes, executing F;

 C. Determine whether there is still a next Training sig period after the current Training sig period; if yes, execute D; if not, execute G;

 D, using the gain adjustment step to adjust the receive channel gain of the time slot in the Adjust period corresponding to the current Training sig period, and then executing E;

 E. Calculate the average power of the signal in the next Training sig period by using all the received signals in the next Training sig period, and use the average power in the next Training sig period and the target received signal power expected to enter the ADC. The difference is calculated to obtain the gain of the receiving channel; then B is executed;

 F. Using the currently calculated receiving channel gain, adjust the receiving channel gain of the time slot in the Adjust period corresponding to the current Training sig period, and end the process;

 Step 0: Confirm that the receive channel gain adjustment of this time slot fails, and end the process.

 In the embodiment of the present invention, the AGCT period includes a plurality of Training sig periods and an Adjust period corresponding to the plurality of Training sig periods, respectively. Wherein, the length of the AGCT period is determined by the length of the Training sig period, the length of the Adjust period, the Training sig period, and the number of Adjust periods.

 In the embodiment of the present invention, the length of the Training sig period is determined by the maximum moving speed of each device in the network. The length of the Adjust period is determined by the response speed at which the receiving end adjusts the gain of the receiving channel. The number of Training sig and Adjust periods is determined based on the dynamic range of the network and the dynamic range acceptable to the ADC of the receiver.

In the embodiment of the present invention, each time slot of the signal further includes a guard interval GP period. In the embodiment of the present invention, the training signal for performing AGC carried in the AGCT period is generated by using a short sequence cyclic shift extension sequence length. The modules of the device of the present invention may be integrated into one or may be deployed separately. The above modules can be combined into one module, or can be further split into multiple sub-modules.

 Based on the same inventive concept as the above method, an embodiment of the present invention further provides a transmitting end. As shown in FIG. 5, FIG. 5 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention. The sender includes:

 The generating module 21 is configured to generate a signal that needs to be sent to the receiving end, where each time slot of the signal includes an automatic gain control training AGCT period and a PDATA period, and the AGCT period includes a training signal for performing automatic gain control AGC, PDATA The data content is included in the time period;

 The sending module 22 is configured to send the signal to the receiving end, and the receiving end performs automatic control of the receiving channel gain of the time slot by using the training signal carried in the AGC period for performing the AGC.

 In the embodiment of the present invention, the AGCT period includes a plurality of training signals Training sig periods and an adjustment Adjust period corresponding to the plurality of Training sig periods, respectively. The length of the AGCT period is determined by the length of the Training sig period, the length of the Adjust period, the Training sig period, and the number of Adjust periods.

 In the embodiment of the present invention, the length of the Training sig period is determined based on the maximum moving speed of each device in the network. The length of the Adjust period is determined based on the response speed at which the receiving end adjusts the gain of the receiving channel. The number of Training sig and Adjust periods is determined based on the dynamic range of the network and the dynamic range acceptable to the ADC of the receiver.

 In the embodiment of the present invention, each time slot of the signal further includes a guard interval GP period. In the embodiment of the present invention, the training signal for performing AGC carried in the AGCT period is generated by using a short sequence cyclic shift spreading sequence length.

FIG. 6 is a schematic structural diagram of another receiving end according to an embodiment of the present invention. As shown in FIG. 6, the receiving end includes: a processor 31 and a memory 32. The memory 32 is configured to store a receiving instruction and a control instruction.

 The processor 31 is in communication with the memory 32, and executes the receiving command and the control command for performing the operations performed by the receiving module 11 and the control module 12, respectively.

 FIG. 7 is a schematic structural diagram of another transmitting end according to an embodiment of the present invention. As shown in FIG. 7, the transmitting end includes: a processor 41 and a memory 42.

 The memory 42, is used to store the generation instruction 21 and the transmission instruction.

 The processor 41 communicates with the memory 42, executes the generation command and the transmission instruction, and performs the operations performed by the generation module 21 and the transmission module 22, respectively.

 The modules of the device of the present invention may be integrated into one or may be deployed separately. The above modules can be combined into one module, or can be further split into multiple sub-modules.

 Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a A computer device (which may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

 A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

 Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Where in the present invention Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

claims

1. An automatic gain control method for a receiving channel, characterized in that the method includes: the receiving end receives a signal from the transmitting end, and each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period; wherein, The AGCT period includes a training signal for automatic gain control AGC, and the PDATA period includes data content;

The receiving end uses the training signal carried in the AGCT period for AGC to perform automatic gain control of the receiving channel in this time slot.

2. The method of claim 1, wherein the AGCT period includes a training signal Training sig period and an Adjust period, and the receiving end uses the training signal carried in the AGCT period for AGC. Perform automatic gain control of the receiving channel in this time slot, including:

The receiving end uses all received signals in the Training sig period to calculate the average power of the signal in the Training sig period;

The receive channel gain is calculated by the difference between the average power and the target received signal power expected to enter the analog-to-digital converter ADC;

The receive channel gain is used to adjust the receive channel gain of this time slot within the Adjust period.

3. The method of claim 1 or 2, wherein the AGCT period includes a plurality of Training sig periods and Adjust periods respectively corresponding to the plurality of Training sig periods, and the receiving end uses the The training signal carried in the AGCT period for AGC performs automatic gain control of the receiving channel in this time slot, specifically including:

A. The receiving end uses all received signals in the first Training sig period to calculate the average power of the signal in the Training sig period, and uses the difference between the average power in the Training sig period and the target received signal power expected to enter the ADC. The difference is calculated and then Receive channel gain;

B. The receiving end determines whether the receiving channel gain is within a reasonable range; if not, execute C; if yes, execute F;

C. The receiving end determines whether there is a next Training sig period after the current Training sig period; if so, execute D; if not, execute G;

D. The receiving end uses the gain adjustment step size to adjust the receiving channel gain of this time slot in the Adjust period corresponding to the current Training sig period, and then executes E;

E. The receiving end uses all received signals in the next Training sig period to calculate the average power of the signal in the next Training sig period, and uses the average power in the next Training sig period to match the target received signal expected to enter the ADC. The difference between the powers is calculated to obtain the receiving channel gain; then execute B;

F. The receiving end uses the currently calculated receiving channel gain to adjust the receiving channel gain of this time slot in the Adjust period corresponding to the current Training sig period, and ends the process;

G. The receiving end confirms that the gain adjustment of the receiving channel in this time slot has failed, and ends the process.

4. The method of claim 1 or 2, wherein the AGCT period includes a plurality of Training sig periods and Adjust periods respectively corresponding to the plurality of Training sig periods; wherein, the AGCT period The length is determined by the length of the Training sig period, the length of the Adjust period, the number of Training sig periods and Adjust periods.

5. The method of claim 4, characterized in that,

The length of the Training sig period is determined by the maximum movement speed of each device in the network;

The length of the Adjust period is determined based on the response speed of the receiving end in adjusting the gain of the receiving channel;

The number of Training sig periods and Adjust periods is determined based on the dynamic range of the network and the dynamic range that the analog-to-digital converter ADC at the receiving end can accept.

6. The method of claim 1, wherein each time slot of the signal Also included is the guard interval GP period.

7. The method of claim 1, wherein the training signal carried in the AGCT period for performing AGC is generated by using a short sequence cyclic shift to extend the sequence length.

8. An automatic gain control method for a receiving channel, characterized in that the method includes: the transmitting end generates a signal that needs to be sent to the receiving end, and each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period, The AGCT period includes a training signal for automatic gain control AGC, and the PDATA period includes data content;

The sending end sends the signal to the receiving end, and the receiving end uses the training signal carried in the AGCT period for AGC to perform automatic gain control of the receiving channel in this time slot.

9. The method of claim 8, wherein the AGCT period includes a plurality of training signal Training sig periods and an Adjust period respectively corresponding to the plurality of Training sig periods; wherein, the AGCT period The length of is determined based on the length of the Training sig period, the length of the Adjust period, the number of Training sig periods and Adjust periods.

10. The method of claim 9, characterized in that,

The length of the Training sig period is determined based on the maximum movement speed of each device in the network;

The length of the Adjust period is determined based on the response speed of the receiving end in adjusting the gain of the receiving channel;

The number of Training sig periods and Adjust periods is determined based on the dynamic range of the network and the dynamic range that the analog-to-digital converter ADC at the receiving end can accept.

11. A receiving end, characterized in that the receiving end includes: A receiving module, configured to receive a signal from the transmitting end. Each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period; the AGCT period includes a training signal for automatic gain control AGC, so The PDATA period includes data content;

A control module configured to use the training signal carried in the AGCT period for AGC to automatically control the gain of the receiving channel in this time slot.

12. The receiving end as claimed in claim 11, characterized in that,

The control module is further configured to use all received signals in the Training sig period to calculate the average power of the signal in the Training sig period when the AGCT period includes a training signal Training sig period and an Adjust period, and use all the received signals in the Training sig period to calculate the average power of the signal in the Training sig period. The difference between the average power and the target received signal power expected to enter the analog-to-digital converter ADC is calculated to obtain the receive channel gain, and the receive channel gain is used to adjust the receive channel gain of this time slot within the Adjust period.

13. The receiving end according to claim 11 or 12, characterized in that,

The control module is further configured to: when the AGCT period includes multiple Training sig periods and Adjust periods respectively corresponding to the multiple Training sig periods,

A. Use all the received signals in the first Training sig period to calculate the average power of the signal in the Training sig period, and use the difference between the average power in the Training sig period and the target received signal power expected to enter the ADC to calculate Obtain the receiving channel gain;

B. Determine whether the receiving channel gain is within a reasonable range; if not, execute C; if yes, execute F;

C. Determine whether there is a next Training sig period after the current Training sig period; if so, execute D; if not, execute G; D. Use the gain adjustment step size to adjust the receiving channel gain of this time slot in the Adjust period corresponding to the current Training sig period, and then execute E;

E. Use all received signals in the next Training sig period to calculate the average power of the signal in the next Training sig period, and use the difference between the average power in the next Training sig period and the target received signal power expected to enter the ADC Calculate the difference to obtain the gain of the receiving channel; then execute B;

F. Use the receive channel gain to adjust the receive channel gain of this time slot within the Adjust period corresponding to the current Training sig period, and end the process;

G. Confirm that the gain adjustment of the receiving channel in this time slot failed.

14. The receiving end according to claim 11 or 12, wherein the AGCT period includes a plurality of Training sig periods and Adjust periods respectively corresponding to the plurality of Training sig periods; wherein, the AGCT period The length of is determined based on the length of the Training sig period, the length of the Adjust period, the number of Training sig periods and Adjust periods.

15. The receiving end as claimed in claim 14, characterized in that,

The length of the Training sig period is determined based on the maximum moving speed of each device in the network; the length of the Adjust period is determined based on the response speed of the receiving end to adjust the gain of the receiving channel;

The number of Training sig periods and Adjust periods is determined based on the dynamic range of the network and the dynamic range that the analog-to-digital converter ADC at the receiving end can accept.

16. The receiving end as claimed in claim 11, characterized in that,

Each time slot of the signal also includes a guard interval GP period.

17. The receiving end as claimed in claim 11, characterized in that,

The training signal carried in the AGCT period for performing AGC is generated by using a short sequence cyclic shift to extend the sequence length.

18. A sending end, characterized in that the sending end includes:

Generating module, used to generate signals that need to be sent to the receiving end. Each time slot of the signal includes an automatic gain control training AGCT period and a data PDATA period. The AGCT period includes a training signal for automatic gain control AGC, and PDATA The time period includes data content;

The sending module is used to send the signal to the receiving end, and the receiving end uses the training signal carried in the AGCT period for AGC to automatically control the receiving channel gain of this time slot.

19. The sending end according to claim 18, wherein the AGCT period includes a plurality of training signal Training sig periods and an Adjust period respectively corresponding to the plurality of Training sig periods; wherein, the AGCT The length of the period is determined based on the length of the Training sig period, the length of the Adjust period, the number of Training sig periods and Adjust periods.

20. The sending end as claimed in claim 19, characterized in that,

The length of the Training sig period is determined based on the maximum movement speed of each device in the network;

The length of the Adjust period is determined based on the response speed of the receiving end in adjusting the gain of the receiving channel;

The number of Training sig periods and Adjust periods is determined based on the dynamic range of the network and the dynamic range that the analog-to-digital converter ADC at the receiving end can accept.