WO2018053870A1

WO2018053870A1 - Duplex communication method, communication device and system

Info

Publication number: WO2018053870A1
Application number: PCT/CN2016/100202
Authority: WO
Inventors: 刘余; 刘乔
Original assignee: 华为技术有限公司
Priority date: 2016-09-26
Filing date: 2016-09-26
Publication date: 2018-03-29
Also published as: CN108292930B; CN108292930A

Abstract

The present invention relates to the field of communications, and disclosed thereby are a duplex communication method, communication device and system, used for eliminating same-frequency interference caused by multipath in a signal propagation channel. The duplex communication method comprises: a first communication device determining a time position of a pilot frequency in a first signal frame according to a time position of an idle time slot in a second signal frame sent by a second communication device, the time position of the pilot frequency in the first signal frame fulfilling: the time when the first communication device receives the pilot frequency in a same-frequency interference signal of the first signal frame is the same as the time when the idle time slot in the second signal frame is received; the first communication device sending a first signal frame; the first communication device receiving the same-frequency interference signal of the first signal frame; and the first communication device estimating a same-frequency interference multipath channel of the first communication device according to the pilot frequency in the same-frequency interference signal of the first signal frame and performing same-frequency interference cancellation. The embodiments of the present invention may be applied to same-frequency interference cancellation.

Description

Duplex communication method, communication device and system

Technical field

The present invention relates to the field of communications, and in particular, to a duplex communication method, a communication device, and a system.

Background technique

Interference is a key technical issue that wireless and microwave communication devices need to address. One of the main interferences of wireless and microwave communication equipment comes from the coupling of the transmitting antenna of the device to the receiving antenna of the local end. In the FDD (English full name: frequency division duplex, Chinese full name: frequency division duplex) system, the transmitting carrier and the receiving carrier use different frequencies, so the use of the duplexer can suppress the interference of the transmitting antenna of the local end to the receiving antenna. In the TDD (English full name: time division duplex, Chinese full name: time division duplex) system, the transmitting carrier and the receiving carrier have the same frequency, and the transmitting and receiving are alternately performed by using different time slots, thereby avoiding the local transmitting antenna pair. Receive antenna interference. If the transmit and receive antennas have the same frequency and are simultaneously performed, the FDD and TDD interference suppression techniques are no longer applicable.

Full-duplex (English abbreviation: FD, full name: full duplex) technology is a simultaneous communication technology with the same frequency duplex transmission. Compared with the duplex mode of FDD and TDD, the spectrum efficiency can theoretically be doubled. The high spectral efficiency of full-duplex technology makes it considered to be a key technology for 5G.

Co-channel interference is a key issue that needs to be addressed by full-duplex technology. In a full-duplex device, the same-frequency interference mainly comes from: on one hand, the signal in the transmitting RF link leaks into the receiving RF link; on the other hand, the transmitting signal of the transmitting antenna is in the same full-duplex device. Receive antennas are received to form co-channel interference. Both of the above interferences are predictable and can be eliminated by adding interference cancellation units to the system's RF circuitry, baseband or optional IF circuitry.

However, when working in a full-duplex system, there is also a way of generating the same-frequency interference. During the communication process, the obstacles in the signal propagation channel generate more reflection or scattering of the signal. Co-channel interference caused by the path. Referring to the dotted line in FIG. 1, the signal from the transmitting antenna of the first communication device is reflected by the obstacle in the channel or is reflected back to the receiving antenna of the first communication device, causing the transmitting antenna of the first communication device to The same-frequency interference of the receiving antenna; the signal sent by the transmitting antenna of the second communication device is reflected by the obstacle in the channel or is reflected back to the receiving antenna of the second communication device, causing the transmitting antenna of the second communication device to receive its own antenna Co-channel interference. This co-channel interference is unknown, unique, and variable in the communication environment, so that the cancellation of the same-frequency interference cannot be achieved in advance through the design of the interference cancellation circuit and the algorithm.

Summary of the invention

Embodiments of the present invention provide a duplex communication method, communication device, and system for canceling co-channel interference generated by multipath in a signal propagation channel.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In one aspect, an embodiment of the present invention provides a duplex communication method, where the method includes: determining, by a first communications device, a time position of a free time slot in a second signal frame sent by the second communications device in the first signal frame. a time position of the pilot, wherein a time position of the pilot in the first signal frame satisfies: a time when the first communication device receives the pilot in the co-channel interference signal of the first signal frame and receives the second signal frame The time of the idle time slot is the same; the first communication device sends the first signal frame; the first communication device receives the same frequency interference signal of the first signal frame; and the first communication device is guided according to the same frequency interference signal of the first signal frame The same frequency interference multipath channel of the first communication device is estimated and the same frequency interference cancellation is performed. The duplex communication method provided by the embodiment of the present invention, the first communication device determines the time position of the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame sent by the second communication device, so that The time at which the communication device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time in the idle time slot in the second signal frame, because the idle time slot energy in the second signal frame is zero or Very small, does not affect the pilot in the first signal frame, so the first communication device can estimate the co-channel interference of the first communication device according to the pilot in the co-channel interference signal of the received first signal frame. Multipath channels, and performing co-channel interference cancellation, eliminates co-channel interference caused by multipath in the signal propagation channel.

In a possible design, the time position of the pilot in the first signal frame satisfies the time when the first communication device receives the pilot in the co-channel interference signal of the first signal frame and receives the second signal frame. The time of the idle time slot is the same, including: the time position of the pilot in the first signal frame satisfies the formula t _d1 +Δt _P1 +mΔτ _f1 =t ₂ +Δt _S2 +nΔτ _f2 ,m,n=0,1,2 And (3), wherein t _d1 is a time when the first communication device receives the first arrival main path of the co-channel interference signal of the first signal frame, and Δt _P1 is a time position of the pilot in the first signal frame, Δτ _f1 is the length of time of the first signal frame, t ₂ is the time when the first communication device receives the frame header of the second signal frame, Δt _S2 is the time position of the idle time slot in the second signal frame, and Δτ _f2 is the first time The length of time of the two signal frames. In this design, the time between the first communication device receiving the pilot in the co-channel interference signal of the first signal frame and the time in the idle time slot in the second signal frame is achieved by the mathematical relationship at each time. the same.

In a possible design, t ₂ can be obtained according to the transmission distance d between the communication devices, in particular,

To obtain, where c is the electromagnetic wave propagation velocity in free space. The design is suitable for a distance between the first communication device and the second communication device.

In a possible design, in a state in which the first communication device and the second communication device are in time synchronization, t ₂ may also be according to a time when the first communication device receives the second signal frame and carried in the second signal frame. Timestamp to get. The design is applicable to a scenario in which the first communication device is synchronized with the second communication device.

In one possible design, t _d1 can be obtained by the first communication device measuring the arrival time of the received signal after transmitting the signal, without the second communication device transmitting a signal. This design is applicable to scenarios where the second communication device has not yet transmitted a signal.

In a possible design, the first communications device determines the time position of the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame sent by the second communications device, including: the first communications device Detecting the energy of the received symbol; determining that the idle time slot of the second signal frame is received when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols; and co-channel interference in the idle time slot of the second signal frame The signal is correlated with the pilot in the first signal frame, and the time position of the pilot in the first signal frame is adjusted. When the maximum correlation peak occurs, the time position of the pilot in the first signal frame is adjusted. In this design, the time at which the first communication device receives the pilot in the co-channel interference signal of the first signal frame and the reception of the idle time slot in the second signal frame can be achieved without measuring t _d1 and t ₂ . The same purpose of time.

In a possible design, before the first communication device determines the time position of the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame sent by the second communication device, the method further includes The first communication device detects a change in the channel environment, and when the channel environment changes drastically, the first communication device begins to determine the temporal position of the pilot in the first signal frame according to the temporal position of the idle time slot in the second signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the first communication device detects a channel environment change, and when the channel environment changes drastically, the first communication device starts determining the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame. The time position includes: the first communication device calculates the co-channel interference energy according to the pilot in the co-channel interference signal of the received first signal frame and the idle time slot in the received second signal frame, when the same frequency When the interference energy changes drastically, the first communication device begins determining the temporal position of the pilot in the first signal frame based on the temporal position of the idle time slot in the second signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the first communication device detects a channel environment change, and when the channel environment changes drastically, the first communication device starts determining the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame. The time position includes: the first communication device detects a change in the channel environment by detecting a change in the received signal quality from the second communication device, and when the received signal quality of the second communication device changes drastically, the first communication The device begins determining the temporal position of the pilot in the first signal frame based on the temporal position of the idle time slot in the second signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the method further includes: the first communication device, according to the last multipath signal of the pilot in the co-channel interference signal of the received first signal frame exceeding the first preset energy threshold; Adjusting the length of time of the pilot in the first signal frame. The design is suitable for multi-path co-channel interference signals with large relative delay. By adjusting the length of the pilot, the pilots include all the main interference signals in the length of time.

In a possible design, the time length Δτ _P1 of the pilot in the first signal frame satisfies the formula Δτ _P1 ·F≥N _max , where N _max is the pilot in the co-channel interference signal of the first signal frame The number of consecutive multipaths between the first and last multipath signals whose energy exceeds the first predetermined energy threshold, the F symbol rate. This design allows the high-frequency co-channel interference multipath signals to be included in the pilot's length of time to balance system performance and overhead.

In a possible design, performing co-channel interference cancellation includes: the first communication device performs co-channel interference cancellation on the multi-path signal in the co-channel interference signal of the first signal frame that satisfies the condition that the energy exceeds the first preset energy The first multipath signal and the last multipath signal of the threshold, and the multipath signal whose energy between the first multipath signal and the last multipath signal exceeds a first preset energy threshold. This design allows only the same-frequency interference multipath signals with higher energy to be offset to balance system performance and overhead.

In a possible design, the method further includes: the first communication device determines the stability of the co-channel interference cancellation by detecting the co-channel interference cancellation residual or the received signal quality of the second communication device; if the co-channel interference cancels The stability of the first communication device reduces the length of time of the first signal frame. This design makes the co-channel interference cancellation residual or the quality of the receiving peer signal stable.

In one possible design, the length of the idle time slot in the second signal frame is greater than or equal to the length of time of the pilot in the first signal frame. This design enables pilots in the first signal frame to fall into idle time slots in the second signal frame for accurate estimation.

In another aspect, an embodiment of the present invention provides a duplex communication method, where the method includes: determining, by a first communications device, a first signal frame according to a time position of a pilot in a second signal frame sent by the second communications device The time position of the idle time slot, the time position of the idle time slot in the first signal frame is satisfied: the time when the second communication device receives the pilot in the same frequency interference signal of the second signal frame and receives the first signal frame The time of the idle time slot is the same; the first communication device sends the first signal frame, and the idle time slot of the first signal frame is used by the second communication device according to the pilot estimate in the co-channel interference signal of the second signal frame. The co-channel of the communication device interferes with the multipath channel and performs co-channel interference cancellation. The duplex communication method provided by the embodiment of the present invention, the first communication device determines the time position of the idle time slot in the first signal frame according to the time position of the pilot in the second signal frame sent by the second communication device, so that The time at which the second communication device receives the pilot in the co-channel interference signal of the second signal frame is the same as the time in the idle time slot in the first signal frame, because the idle time slot energy in the first signal frame is zero or Very small, does not affect the pilot in the second signal frame, so the second communication device can estimate the co-channel interference of the second communication device according to the pilot in the co-channel interference signal of the received second signal frame. Multipath channels, and performing co-channel interference cancellation, eliminates co-channel interference caused by multipath in the signal propagation channel.

In a possible design, the time position of the idle time slot in the first signal frame satisfies: the time when the second communication device receives the pilot in the co-channel interference signal of the second signal frame and receives the first signal frame The time of the idle time slot in the same is the same, including: the transmission time of the idle time slot in the first signal frame satisfies t _d2 + Δt _P2 + qΔτ _f2 = t ₁ + Δt _S1 + pΔτ _f1 , p, q = 0, 1, 2, 3, where t _d2 is the time at which the second communication device receives the first arriving main path of the co-channel interference signal of the second signal frame, and Δt _P2 is the time position of the pilot in the second signal frame , Δτ _f2 is the length of time of the second signal frame, t ₁ is the time when the second communication device receives the frame header of the first signal frame, and Δt _S1 is the time position of the idle time slot in the first signal frame, and Δτ _f1 is The length of time of the first signal frame. In this design, the timing of the second communication device receiving the pilot in the co-channel interference signal of the second signal frame and the time of receiving the idle time slot in the first signal frame are achieved by mathematical relationships at various times. the same.

In a possible design, t ₁ can be obtained according to the transmission distance d between the communication devices, that is, To obtain, where c is the electromagnetic wave propagation velocity in free space. The design is suitable for a distance between the first communication device and the second communication device.

In a possible design, when the first communication device and the second communication device are in time synchronization, t ₁ may also be according to the time when the second communication device receives the first signal frame and carried in the first signal frame. Timestamp to get. The design is applicable to a scenario in which the first communication device is synchronized with the second communication device.

In one possible design, t _d2 can be obtained by the second communication device measuring the arrival time of the received signal after transmitting the signal, in the event that the first communication device does not transmit a signal. Finally, t _{d2 is} passed by the second communication device to the first communication device via the message. This design is applicable to scenarios where the first communication device has not yet transmitted a signal.

In one possible design, the first communications device adjusts the temporal location of the idle time slot in the first signal frame; the first communications device receives an acknowledgment message from the second communications device, the acknowledgment message being used to indicate in the first signal frame The time position of the idle time slot is adjusted, wherein the acknowledgement message is that the second communication device performs a correlation peak operation on the same-frequency interference signal in the idle time slot of the received first signal frame and the pilot in the second signal frame, When the maximum correlation peak occurs, it is transmitted by the second communication device; the idle time slot of the first signal frame is used by the second communication device to detect the energy of the received symbol, when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols And the second communication device determines to receive the idle time slot of the first signal frame. In this design, the time at which the second communication device receives the pilot in the co-channel interference signal of the second signal frame and the reception of the idle time slot in the first signal frame can be achieved without measuring t _d2 and t ₁ The same purpose of time.

In one possible design, the length of the idle time slot in the first signal frame is greater than or equal to the time length of the pilot in the second signal frame. This design enables pilots in the second signal frame to fall into idle time slots in the first signal frame for accurate estimation.

In another aspect, an embodiment of the present invention provides a first communications device, where the first communications device includes: a determining unit, configured to determine, according to a time position of a free time slot in a second signal frame sent by the second communications device. a time position of a pilot in a signal frame, wherein a time position of a pilot in the first signal frame satisfies: a time at which the first communication device receives the pilot in the co-channel interference signal of the first signal frame and receives the time The time of the idle time slot in the second signal frame is the same; the sending unit is configured to send the first signal frame; the receiving unit is configured to receive the co-channel interference signal of the first signal frame; and the estimating unit is configured to use the first signal frame according to the first signal frame The pilot in the co-channel interference signal estimates the co-channel interference multipath channel of the first communication device and performs co-channel interference cancellation. The first communication device provided by the embodiment of the present invention, the first communication device determines, according to the time position of the idle time slot in the second signal frame sent by the second communication device, the time position of the pilot in the first signal frame, so that One communication The time when the device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time of receiving the idle time slot in the second signal frame, because the idle time slot energy in the second signal frame is zero or very small Not affecting the pilot in the first signal frame, so the first communication device can estimate the co-channel interference multipath of the first communication device according to the pilot in the co-channel interference signal of the received first signal frame. The channel, and performing co-channel interference cancellation, eliminates co-channel interference caused by multipath in the signal propagation channel.

In a possible design, the determining unit is configured to: determine a time position of the pilot in the first signal frame according to a time position of the idle time slot in the second signal frame sent by the second communication device, where The time position of the pilot in the signal frame satisfies the formula t _d1 +Δt _P1 +mΔτ _f1 =t ₂ +Δt _S2 +nΔτ _f2 ,m,n=0,1,2,3..., where t _d1 is The time at which the first arriving main path of the co-channel interference signal of the first signal frame is received by a communication device, Δt _P1 is the time position of the pilot in the first signal frame, and Δτ _f1 is the time length of the first signal frame, t ₂ is the time when the first communication device receives the frame header of the second signal frame, Δt _S2 is the time position of the idle time slot in the second signal frame, and Δτ _f2 is the time length of the second signal frame. In this design, the time between the first communication device receiving the pilot in the co-channel interference signal of the first signal frame and the time in the idle time slot in the second signal frame is achieved by the mathematical relationship at each time. the same.

In a possible design, the determining unit is specifically configured to: detect energy of the received symbol; when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols, determine that the idle time slot of the second signal frame is received; Performing a correlation peak operation on the same-frequency interference signal in the idle time slot of the second signal frame and the pilot in the first signal frame, and adjusting the time position of the pilot in the first signal frame, when the maximum correlation peak occurs, The time position of the pilot in the first signal frame is adjusted. In this design, the time at which the first communication device receives the pilot in the co-channel interference signal of the first signal frame and the reception of the idle time slot in the second signal frame can be achieved without measuring t _d1 and t ₂ . The same purpose of time.

In a possible design, the first communication device further includes: a detecting unit, configured to detect a channel environment change, and the first communication device starts to determine according to a time position of the idle time slot in the second signal frame when the channel environment changes drastically The temporal position of the pilot in the first signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the detecting unit is specifically configured to: calculate the co-channel interference energy according to the pilot in the co-channel interference signal of the received first signal frame and the idle time slot in the received second signal frame. When the co-channel interference energy changes drastically, the first communication device begins to determine the temporal position of the pilot in the first signal frame according to the temporal position of the idle time slot in the second signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the detecting unit is specifically configured to: detect a change in the channel environment by detecting a change in the received signal quality from the second communication device, when the received signal quality of the second communication device changes drastically The first communications device begins determining a temporal location of the pilot in the first signal frame based on a temporal location of the idle time slot in the second signal frame. In this design, the point in time at which multipath channel estimation begins can be determined.

In a possible design, the first communications device further includes: an adjusting unit, configured to: according to the received first signal frame, the pilot signal in the same frequency interference signal exceeds the first preset energy threshold The path signal adjusts the length of time of the pilot in the first signal frame. The design is suitable for multi-path co-channel interference signals with large relative delays. By adjusting the length of the pilots, the pilots include all the main lengths of time. The desired interference signal.

In a possible design, the estimating unit is specifically configured to perform the same-frequency interference cancellation on the multi-path signal satisfying the following conditions in the same-frequency interference signal of the first signal frame: the first one of the energy exceeding the first preset energy threshold The multipath signal and the last multipath signal, and the multipath signal whose energy between the first multipath signal and the last multipath signal exceeds a first predetermined energy threshold. This design allows only the same-frequency interference multipath signals with higher energy to be offset to balance system performance and overhead.

In a possible design, the first communication device further includes: a detecting unit, configured to determine the stability of the co-channel interference cancellation by detecting the co-channel interference cancellation residual or the received signal quality of the second communication device; If the stability of the co-channel interference cancellation is poor, the length of time of the first signal frame is reduced. This design makes the co-channel interference cancellation residual or the quality of the receiving peer signal stable.

In another aspect, an embodiment of the present invention provides a first communications device, where the first communications device includes: a determining unit, configured to determine, according to a time position of a pilot in a second signal frame sent by the second communications device, The time position of the idle time slot in the signal frame, the time position of the idle time slot in the first signal frame is satisfied: the time when the second communication device receives the pilot in the same frequency interference signal of the second signal frame and receives the first The time of the idle time slot in a signal frame is the same; the sending unit is configured to send the first signal frame, and the idle time slot of the first signal frame is used by the second communication device according to the guide in the same frequency interference signal of the second signal frame The same frequency interference multipath channel of the second communication device is frequency estimated, and co-channel interference cancellation is performed.

In a possible design, the determining unit is specifically configured to: determine a time position of the idle time slot in the first signal frame according to a time position of the pilot in the second signal frame sent by the second communication device, the first signal frame The transmission time of the idle time slot in the range satisfies t _d2 + Δt _P2 + qΔτ _f2 = t ₁ + Δt _S1 + pΔτ _f1 , p, q = 0, 1, 2, 3..., where t _d2 is the second communication The time when the device receives the first arrival main path of the co-channel interference signal of the second signal frame, Δt _P2 is the time position of the pilot in the second signal frame, and Δτ _f2 is the time length of the second signal frame, and t ₁ is The time at which the second communication device receives the frame header of the first signal frame, Δt _S1 is the time position of the idle time slot in the first signal frame, and Δτ _f1 is the time length of the first signal frame. In this design, the timing of the second communication device receiving the pilot in the co-channel interference signal of the second signal frame and the time of receiving the idle time slot in the first signal frame are achieved by mathematical relationships at various times. the same.

In one possible design, the length of the idle time slot in the first signal frame is greater than or equal to the time length of the pilot in the second signal frame. The design is suitable for a distance between the first communication device and the second communication device.

In a possible design, the determining unit is specifically configured to: adjust a time position of the idle time slot in the first signal frame; receive an acknowledgement message from the second communication device, where the acknowledgement message is used to indicate idle time in the first signal frame The time position of the slot is adjusted, wherein the acknowledgement message is that the second communication device performs a correlation peak operation on the same-frequency interference signal in the idle time slot of the received first signal frame and the pilot in the second signal frame, when appears The maximum correlation peak is transmitted by the second communication device; the idle time slot of the first signal frame is used by the second communication device to detect the energy of the received symbol, when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols, then The second communication device determines to receive the idle time slot of the first signal frame. In this design, the time at which the second communication device receives the pilot in the co-channel interference signal of the second signal frame and the reception of the idle time slot in the first signal frame can be achieved without measuring t _d2 and t ₁ The same purpose of time.

In another aspect, an embodiment of the present invention provides a first communications device, where the communications device can implement the functions performed by the first communications device in the foregoing method, where the functions can be implemented by hardware or by hardware. Software Implementation. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the first communication device includes a processor and a transceiver configured to support the first communication device to perform a corresponding function in the above method. The transceiver is configured to support communication between the first communication device and other network elements. The first communication device can also include a memory for coupling with the processor that retains the program instructions and data necessary for the first communication device.

The first communication device provided by the embodiment of the present invention can perform the above-described duplex communication method. Therefore, the technical effects that can be obtained by reference to the foregoing method embodiments are not described herein.

In another aspect, an embodiment of the present invention provides a communication system, including the apparatus of the foregoing aspect, which can implement the functions of the first communication unit.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the first network device, including a program designed to perform the above aspects.

Compared with the prior art, in the solution provided by the embodiment of the present invention, the first communications device determines the time of the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame sent by the second communications device. Positioning such that the first communication device receives the pilot in the co-channel interference signal of the first signal frame at the same time as the idle time slot in the second signal frame, due to the idle time slot in the second signal frame Energy is zero or very Small, does not affect the pilot in the first signal frame, so the first communication device can estimate the co-channel interference of the first communication device according to the pilot in the same-frequency interference signal of the received first signal frame. The channel is channeled, and co-channel interference cancellation is performed, eliminating co-channel interference caused by multipath in the signal propagation channel.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic structural diagram of a duplex communication system according to an embodiment of the present invention;

2 is a schematic structural diagram of hardware of a first communications device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of hardware of a second communications device according to an embodiment of the present disclosure;

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

FIG. 5 is a schematic flowchart of a duplex communication method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a co-channel interference signal according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart diagram of another duplex communication method according to an embodiment of the present invention;

FIG. 8(a) is a schematic diagram of a communication frame received by a first communication device according to an embodiment of the present invention;

FIG. 8(b) is a schematic diagram of a communication frame received by a second communication device according to an embodiment of the present invention;

FIG. 9(a) is a schematic diagram of another communication frame received by a first communication device according to an embodiment of the present invention;

FIG. 9(b) is a schematic diagram of another communication frame received by a second communication device according to an embodiment of the present invention;

FIG. 10(a) is a schematic diagram of still another communication frame received by a first communication device according to an embodiment of the present invention;

FIG. 10(b) is still another received by the second communication device according to the embodiment of the present invention. Schematic diagram of a communication frame;

FIG. 11 is a schematic diagram of a first communication device receiving multipath co-channel interference according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of grouping multipath co-channel interference according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a first communications device according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of still another first communication device according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of another first communication device 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.

As used herein, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, which may be hardware, firmware, a combination of hardware and software, software, or in operation. software. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread in execution, a program, and/or a computer. As an example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution, and a component can be located in a computer and/or distributed between two or more computers. Moreover, these components can execute from various computer readable media having various data structures thereon. These components may be passed, for example, by having one or more data packets (eg, data from one component that interacts with the local system, another component of the distributed system, and/or signaled through, such as the Internet) Networking with other systems Mutual signals communicate in a local and/or remote process.

Furthermore, the present application describes various aspects in connection with a wireless network device that can be used to communicate with one or more communication devices; the first communication device can be a user device that can be used for one or more user devices Communication (such as D2D (English full name: device to device)) can also be used to communicate with one or more access network devices. The first communication device can be a user device and can include a system, a subscriber unit, a subscriber station, a mobile station, a mobile wireless terminal, a mobile device, a node, a device, a remote station, a remote terminal, a terminal, a wireless communication device, a wireless communication device, or Some or all of the features of the user agent. The first communication device may be a cellular phone, a cordless phone, a session initiation protocol (English name: session initiation protocol, SIP for short), a smart phone, a wireless local loop (English name: wireless local loop, referred to as: WLL) station, Personal digital assistant (full name: personal PDA), laptop computer, handheld communication device, handheld computing device, satellite wireless device, wireless modem card and/or for communicating on a wireless system Other processing equipment. An access network device may also be referred to as an access point, a node, a Node B, an evolved Node B (eNB), or some other network entity, and may include some or all of the functions of the above network entities. The access network device can communicate with the first communication device over the air interface. This communication can be done by one or more sectors. The access network device can be used as a router between the wireless terminal and the rest of the access network by converting the received air interface frame into an IP packet, wherein the access network includes an internet protocol (English name: internet protocol) , referred to as: IP) network. The access network device can also coordinate the management of air interface attributes and can also be a gateway between the wired network and the wireless network.

The application will present various aspects, embodiments, or features in a system that can include multiple devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules, etc. discussed in connection with the figures. In addition, a combination of these schemes can also be used.

In addition, in the embodiments of the present invention, the word "exemplary" is used to mean an example, an illustration, or a description. Any embodiment or design described as "example" in this application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the term use examples is intended to present concepts in a concrete manner.

In the embodiment of the present invention, information, signal, message, and channel may sometimes be mixed. It should be noted that the meaning to be expressed is consistent when the difference is not emphasized. "(of)" "corresponding (relevant)" and "corresponding" can sometimes be mixed. It should be noted that the meanings to be expressed are consistent when the distinction is not emphasized.

The network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention. The technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

The embodiment of the present invention can be applied to a time division duplexing (TDD) scenario or a frequency division duplexing (FDD) scenario.

The embodiment of the present invention is described in the context of a 4G network in a wireless communication network. It should be noted that the solution in the embodiment of the present invention may also be applied to LTE and its evolution technology, such as 5G, and the corresponding name may also be used in other wireless communications. The name of the corresponding function in the network is replaced.

The terms "first" and "second" are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, thereby defining "first", "first" A feature of "two" may include one or more of the features, either explicitly or implicitly. The "first" and "second" in the following embodiments are only used for the difference, such as the first core network device and the second core network device.

Embodiments of the present invention provide a duplex communication system, as shown in FIG. The system includes a first communication device 11 and a second communication device 12. The first signal frame transmitted by the first communication device is reflected and/or scattered by an obstacle in the propagation channel to form a co-channel interference signal having multipath characteristics, and is received by the receiving antenna of the first communication device; The second signal frame transmitted by the communication device is reflected and/or scattered by an obstacle in the propagation channel to form a co-channel interference signal having multipath characteristics and received by the receiving antenna of the second communication device.

Referring to FIG. 2, it is a hardware structure diagram of the first communication device 11 in the embodiment of the present invention. The first communication device 11 includes a digital baseband processing unit 111 and a DAC (English full name: digital to analog converter, full name: digital simulation) Converter, 112, ADC (English full name: analog to digital converter, Chinese full name: analog to digital converter) 113, transceiver radio frequency front end 114 and antenna 115, wherein the digital baseband processing unit 111 includes a first processing module 1111, residual And a received signal detecting module 1112, a frame processing module 1113, a multipath co-channel interference canceling module 1114, a multipath co-channel interference channel estimating module 1115, and a second processing module 1116. The first processing module and the second processing module are configured to perform operations such as modulation and demodulation, digital filtering, equalization processing, phase noise and frequency offset processing, and IQ imbalance processing. After the transmission service data is processed by the first processing module, a transmission signal frame is formed at the frame processing module, and the frame processing module operates the signal frame structure. After the signal frame is processed by the second processing module, it is converted into an analog signal by the DAC, and transmitted through the transceiver RF front end and the antenna. The receiving antenna receives the second signal frame transmitted by the second communication device, and the multipath co-channel interference signal formed by the first signal frame transmitted by the first communication device via channel reflection and/or scattering. All signals received by the antenna are converted into digital signals by the ADC via the RF front end of the receiver and sent to the digital baseband processing unit. The multipath co-channel interference channel estimation module performs multipath co-channel interference by using the received second signal frame, the multipath co-channel interference signal frame formed by channel reflection and/or scattering of the first signal frame, and the frame formed by the frame processing module. Channel estimation. The multipath co-channel interference channel estimation module also controls the processing of the transmitted signal frame by the frame processing module, such as adjusting the temporal position of the pilot and/or idle time slots. The multipath co-channel interference cancellation module reconstructs the multipath co-channel interference signal frame according to the channel parameters and the transmission signal frame obtained by the multipath co-channel interference channel estimation module, and subtracts the reconstructed multipath co-channel interference signal from the received signal. Frame, get the second communication The second signal frame sent by the device, thereby implementing multipath co-channel interference cancellation. The residual and received signal detection module detects the quality of the signal after cancellation by the multipath co-channel interference cancellation module. The residual and received signal detection module can also adjust the frame length according to the stability of the same-frequency interference cancellation. In addition, the second processing module may further calculate the co-channel interference energy according to the pilot in the co-channel interference signal of the received first signal frame and the idle time slot in the received second signal frame.

Referring to FIG. 3, which is a hardware structure diagram of a second communication device 12 according to an embodiment of the present invention, the second communication device 12 includes: a digital baseband processing unit 121, a DAC 122, an ADC 123, a transceiver radio front end 124, and an antenna 125, wherein The digital baseband processing unit 121 includes a first processing module 1211, a residual and received signal detecting module 1212, a frame processing module 1213, a multipath co-channel interference canceling module 1214, a multipath co-channel interference channel estimating module 1215, and a second processing module. 1216. The functions of the above units and modules refer to the functions of the units and modules in the first communication device, and are not described herein again.

The following describes an embodiment of the present invention by taking the first communication device as an example. Those skilled in the art can understand that when the first communication device performs the function of the first communication device described below, the second communication device performs the following second communication. The function of the device; when the first communication device performs the function of the second communication device described below, the second communication device performs the functions of the first communication device described below.

Referring to FIG. 4, the signal frame described in the embodiment of the present invention includes a pilot, an idle time slot, and other overhead and service data portions, wherein the idle time slot refers to all zero data in the signal frame, or most A data sequence of zero, such that the transmit power of the transmitted signal is zero or very small during the time corresponding to the idle time slot, and the corresponding energy is zero or very small; the pilot is used to estimate the co-channel interference caused by the multipath. Assume that the time length of the signal frame is Δτ _f , the time length of the pilot is Δτ _P , the start time of the frame head of the pilot signal frame is Δt _P , the time length of the idle time slot is Δτ _S , and the idle time slot signal The start time of the frame header of the frame is Δt _S . Correspondingly, the time length of the first signal frame is Δτ _f1 , the time length of the second signal frame is Δτ _f2 , the time length of the idle time slot in the first signal frame is Δτ _S1 , and the idle time slot in the second signal frame The length of time is Δτ _S2 , the length of the pilot in the first signal frame is Δτ _P1 , and the length of the pilot in the second signal frame is Δτ _P2 . In addition, the time at which the communication device starts detecting the co-channel interference of the signal frame after transmitting the signal frame is referred to, and it is assumed that the communication device receives the first arrival main path of the co-channel interference signal of the signal frame transmitted by itself. The time is t _d , and after t _d , other multipath co-channel interference signals of the signal frame successively start to reach the communication device. Further, assuming the pilot number N _P , the relationship between the pilot length Δτ _P , the symbol rate F (Sample/s, the number of symbols per second), and the time length of the signal frame Δτ _f is:

N _P =Δτ _P ·F Formula (1)

The total number of symbols per signal frame comprising N _f is:

N _f =Δτ _f ·F Formula (2)

The time position of the pilot or idle time slot in the signal frame may be adjusted as needed, such that the pilot and the second communication in the co-channel interference signal of the first signal frame sent by the first communication device received by the first communication device The idle time slot time position in the second signal frame sent by the device is the same, so that the first communication device can estimate the multipath co-channel interference of the first communication device according to the pilot in the first signal frame; And receiving, by the second communication device, the pilot in the same-frequency interference signal of the second signal frame is the same as the idle time slot in the first signal frame sent by the first communications device, so that the second communications device can be configured according to the The pilots in the two signal frames estimate the multipath co-channel interference of the second communication device.

Multipath channel estimation algorithm can be used to estimate multipath channel, such as least squares estimation (English abbreviation: LS, English full name: least square), based on MMSE (English full name: minimum mean square error, Chinese abbreviation: minimum mean square error, Channel estimation and estimation methods such as LMMSE (English full name: linear minimum mean square error) estimation. Other channel estimation methods can also be implemented by those skilled in the art through the description of this paragraph, and the present invention will not be described herein.

The signal frame of the embodiment of the present invention is applicable to the first signal frame or the second signal frame, unless otherwise specified. The same-frequency interference signal of the signal frame according to the embodiment of the present invention means that the signal frame is The co-channel interference signal generated by the multipath effect during the propagation process; the first signal frame or the second signal frame in the embodiment of the present invention is not a single a signal frame, but a type of signal frame, for example, the first signal frame may include a first first signal frame, a second first signal frame, etc. Similarly, the second signal frame may include a first second frame. a signal frame, a second second signal frame, etc., for the first communication device, the embodiment of the present invention adjusts the guidance in the next first signal frame by estimating the co-channel interference of the previous first signal frame The time position or length of time of the frequency or idle time slot, for the second communication device, the embodiment of the present invention adjusts the guidance in the next second signal frame by estimating the co-channel interference of the previous second signal frame The time position or time length of the frequency or idle time slot; the time position of the pilot in the signal frame according to the embodiment of the present invention refers to the time difference between the start time of the pilot in the signal frame and the frame header of the signal frame. The time position of the idle time slot in the signal frame according to the embodiment of the present invention refers to the time difference between the start time of the idle time slot in the signal frame and the frame header of the signal frame.

The duplex communication method, communication device and system provided by the embodiments of the present invention adjust the time position and/or the length of the pilot in the signal frame transmitted by the communication parties and the time position and/or the time length of the idle time slot. The one communication device receives the pilot of the same frequency interference generated by the multipath of the current side while receiving the idle time slot of the opposite side, so as to estimate and cope with the same frequency interference channel according to the pilot of the same frequency interference of the current side. Offset, thereby eliminating co-channel interference caused by multipath in the signal propagation channel.

An embodiment of the present invention provides a duplex communication method, which is applied to the above communication system. Referring to FIG. 5, the method includes:

S101. The first communications device determines, according to a location of the idle time slot in the second signal frame sent by the second communications device, a location of the pilot in the first signal frame, where the location of the pilot in the first signal frame satisfies: The time at which the first communication device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time at which the idle time slot in the second signal frame is received.

Specifically, the time position of the pilot in the first signal frame and the time position of the idle time slot in the second signal frame satisfy the equation:

t _d1 +Δt _P1 +mΔτ _f1 =t ₂ +Δt _S2 +nΔτ _f2 ,m,n=0,1,2,3... Equation (3)

The time at which the first communication device starts detecting the co-channel interference of the first signal frame after transmitting the first signal frame is referred to, and t _d1 is the same-frequency interference signal that the first communication device receives the first signal frame. The first time to reach the main path, Δt _P1 is the time position of the pilot in the first signal frame, Δτ _f1 is the time length of the first signal frame, and t ₂ is the first communication device receives the second communication device The time of the frame header of the second signal frame, Δt _S2 is the time position of the idle time slot in the second signal frame transmitted by the second communication device, and Δτ _f2 is the time length of the second signal frame.

The effect of the implementation is that the receiver of the first communication device can simultaneously receive the pilot in the co-channel interference signal of the first signal frame and the idle time slot in the second signal frame sent by the second communication device, due to the second signal frame The idle time slot in the first time does not interfere with the pilot in the co-channel interference signal of the first signal frame, so the first communication device can multipath according to the pilot in the co-channel interference signal of the first signal frame. The channel is estimated.

t _d1 and t ₂ are the intrinsic parameters of the channel. When the channel environment is determined, these two parameters are also determined at the same time. Therefore, for the two parameters t _d1 and t ₂ , only the parameters can be measured and cannot be changed. And Δτ _f1 , Δτ _f2 , Δt _P1 and Δt _S2 are parameters that the device can manipulate to change. Since the value of Δt _S2 can be set in advance, Δτ _f1 and Δτ _f2 can be obtained in advance, or specifically, the values of Δτ _f1 and Δτ _f2 are set to be equal. By selecting the appropriate values of m and n, Δt _P1 can be determined.

Optionally, in an implementation manner, t ₂ may be obtained according to a transmission distance d between the communication devices, that is,

To obtain, where c is the electromagnetic wave propagation velocity in free space. The method is suitable for a distance between a first communication device and a second communication device.

Optionally, in a possible implementation manner, when the first communications device and the second communications device are in time synchronization (for example, after using the 1588v2 protocol synchronization), t ₂ may also receive the first communications device according to the first communications device. The time of the two signal frames and the time stamp carried in the second signal frame are obtained. Illustratively, the second communication device inserts another pilot with a time stamp in the second signal frame. The first communication device acquires the timestamp therein when receiving the pilot, and records the reception time, and the time difference between the timestamp and the reception time in the pilot is t ₂ . The method is applicable to a scenario in which a first communication device synchronizes with a second communication device.

Optionally, in a possible implementation manner, t _d1 may be obtained by the first communication device measuring the arrival time of the received signal after transmitting the signal, if the second communication device does not send a signal. The method is applicable to a scenario in which the second communication device has not sent a signal.

Optionally, in a possible implementation, the time positions of the pilots in the first signal frame may be determined by adjusting the time window without measuring t _d1 and t ₂ .

Specifically, the first communication device detects the energy of the received symbol, and when the energy of the received symbol suddenly decreases and continues for a plurality of symbols continuously, determining that the idle time slot of the second signal frame is received, and receiving the second signal The co-channel interference signal in the idle time slot of the frame performs a correlation peak operation with the pilot in the transmitted first signal frame, and adjusts the time position of the pilot in the first signal frame. When the maximum correlation peak occurs, the first The time position of the pilot in the signal frame is adjusted. At this time, the time position of the pilot in the first signal frame satisfies: the time when the first communication device receives the pilot in the co-channel interference signal of the first signal frame and the time when the idle time slot in the second signal frame is received the same. That is, at this time, it is indicated that Δt _P1 satisfies the formula (3).

The reason is that Δt _S2 has been determined when the second communication device transmits the second signal frame. In the idle time slot of the second signal frame, the signal power of the second signal frame is zero or very small, so the first communication device detects that when the energy of the received symbol suddenly decreases and continuously continues for a plurality of symbols, it is determined that the first received The idle time slot of the two signal frames. It can be considered that the signal power received by the first communication device at this time is the power of the local multipath co-channel interference signal. Then, performing correlation peak calculation on the same-frequency interference signal in the idle time slot of the received second signal frame and the transmitted pilot, and adjusting Δt _P1 , and indicating the pilot of the first signal frame when the maximum correlation peak occurs Falling into the idle time slot of the second signal frame, that is, Δt _P1 satisfies the formula (3).

In addition, the first communications device may further determine a free slot position in the first signal frame according to the pilot position in the second signal frame, where the location of the idle slot in the first signal frame is satisfied: the second communication device receives the first The time of the pilot in the co-channel interference signal of the two signal frame is the same as the time of receiving the idle time slot in the first signal frame, and the idle time slot of the first signal frame is used by the second communication device according to the second signal frame. The pilot in the co-channel interference signal estimates the co-channel interference multipath channel of the second communication device and performs co-channel interference cancellation.

Determining, by the first communication device, a time position of the idle time slot in the first signal frame according to a time position of the pilot in the second signal frame sent by the second communication device, so that the second communication device receives the same frequency of the second signal frame The time of the pilot in the interference signal is the same as the time of receiving the idle time slot in the first signal frame, since the idle time slot energy in the first signal frame is zero or very small, not in the second signal frame The pilot has an influence, so the second communication device can estimate the co-channel interference multipath channel of the second communication device according to the pilot in the co-channel interference signal of the received second signal frame, and perform the same-frequency interference cancellation to eliminate Co-channel interference generated by multipath in the signal propagation channel.

Specifically, the time position of the idle time slot in the first signal frame and the time position of the pilot in the second signal frame satisfy the equation:

t _d2 +Δt _P2 +qΔτ _f2 =t ₁ +Δt _S1 +pΔτ _f1 ,p,q=0,1,2,3... Equation (4)

The time at which the second communication device starts detecting the co-channel interference of the second signal frame after the second signal frame is transmitted is referred to, and t _d2 is the same-frequency interference signal that the second communication device receives the second signal frame. The first time to reach the main path, Δt _P2 is the time position of the pilot in the second signal frame, Δτ _f2 is the time length of the second signal frame, and t ₁ is the second communication device receiving the first communication device The time of the frame header of the first signal frame, Δt _S1 is the time position of the idle time slot in the first signal frame, and Δτ _f1 is the time length of the first signal frame. The effect of the implementation is that the receiver of the second communication device can simultaneously receive the pilot in the co-channel interference signal of the second signal frame and the idle time slot in the first signal frame sent by the first communication device, due to the first signal frame The idle time slot energy in the zero or very small does not interfere with the pilot in the co-channel interference signal of the second signal frame, so the second communication device can according to the pilot in the co-channel interference signal of the second signal frame Estimating the same frequency interference multipath channel.

Determining the position of the pilot in the first signal frame is similar to the location of the idle time slot in the second signal frame transmitted by the first communication device according to the second communication device, and t _d2 and t ₁ are inherent parameters of the channel, when the channel When the environment is determined, these two parameters are also determined at the same time, so the two parameters t _d2 and t ₁ can only be measured and cannot be changed. And Δτ _f1 , Δτ _f2 , Δt _P2 and Δt _S1 are parameters that the device can manipulate to change. Since the value of Δt _S1 can be set in advance, Δτ _f1 and Δτ _f2 can be obtained in advance, or specifically, the values of Δτ _f1 and Δτ _f2 are set to be equal. By selecting the appropriate values of m and n, Δt _P2 can be determined.

Optionally, in an implementation manner, t ₁ may be obtained according to a transmission distance d between the communication devices, that is,

To obtain, where c is the electromagnetic wave propagation velocity in free space.

Alternatively, in one possible implementation, in a state where the first communication device and the second communication device at the time of synchronization (e.g., using the post-1588v2 synchronization), t ₁ may also receive the first communication device according to a second Obtained by the time of a signal frame and the timestamp carried in the first signal frame. Illustratively, the first communication device inserts another pilot with a time stamp in the first signal frame. Receiving a second communication device wherein when the time stamp is obtained pilot, while recording the reception time, the time stamp and the reception time is the difference between the pilot t _1. Finally, by the second communication device is transmitted to the t ₁ a first message via the communication device.

Optionally, in a possible implementation manner, t _d2 may be obtained by measuring, by the second communications device, the arrival time of the received signal after the signal is transmitted by the first communications device. Finally, t _{d2 is} passed by the second communication device to the first communication device via the message.

Optionally, in a possible implementation, the time positions of the idle time slots in the first signal frame may be determined by adjusting the time window without measuring t _d2 and t ₁ .

Specifically, the first communication device adjusts a time position of the idle time slot in the first signal frame, and the second communication device detects the energy of the received symbol, when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols, then The second communication device determines that the idle time slot of the first signal frame is received, and the second communication device pairs the same frequency interference signal in the idle time slot of the received first signal frame with the pilot in the transmitted second signal frame Performing a correlation peak operation, when the maximum correlation peak occurs, the second communication device notifies the first communication device by the confirmation message that the time position of the idle time slot in the first signal frame is adjusted, and then the first communication device receives the acknowledgement message. The time position adjustment of the idle time slot in the first signal frame can be determined. At this time, the time position of the idle time slot in the first signal frame satisfies: the time when the second communication device receives the pilot in the same frequency interference signal of the second signal frame and the time interval of receiving the idle time slot in the first signal frame The time is the same. That is, at this time, it is indicated that Δt _S1 satisfies the formula (4). The reason is similar to the position of the pilot in the first signal frame determined by the first communication device according to the position of the idle time slot in the second signal frame sent by the second communication device, and details are not described herein again.

It should be noted that those skilled in the art can understand that the embodiment of the present invention is to: as long as the time position of the idle time slot in the signal frame of the communication device of the present side is satisfied with the same frequency interference signal of the opposite communication device. The time positions of the pilots are aligned in time, and the time position of the pilot in the co-channel interference signal of the communication device of the present side is time aligned with the time position of the idle time slot in the signal frame of the contralateral communication device. It is not emphasized whether the current communication device adjusts the time position of the idle time slot or the pilot or the time position of the idle communication device to the idle time slot or the pilot. For example, the first communication device may also determine the temporal position of the pilot in the first signal frame according to the temporal position of the idle time slot in the second signal frame, and the second communication device is configured according to the idle time slot in the first signal frame. The temporal position determines the temporal position of the pilot in the second signal frame; or the first communication device can determine the temporal position of the idle time slot in the first signal frame based on the temporal position of the pilot in the second signal frame, Determining, by the second communication device, a temporal location of the idle time slot in the second signal frame according to a temporal position of the pilot in the first signal frame; or, may be performed by the second communication device according to the idle time slot in the first signal frame The time position determines a temporal position of a pilot in the second signal frame, and the second communication device determines a temporal position of the idle time slot in the second signal frame based on a temporal position of the pilot in the first signal frame.

In addition, it should be further explained that, since the first signal frame or the second signal frame refers to a type of signal frame, and does not refer to a single signal frame, the above description of adjusting the time position of the idle time slot or the pilot, " Determining, by the first communication device, a temporal position of the pilot in the first signal frame according to a temporal position of the idle time slot in the second signal frame, where the second communication device determines the time position according to the idle time slot in the first signal frame The time position of the pilot in the two signal frames includes, but is not limited to, the time at which the first communication device determines the pilot in the first first signal frame according to the temporal position of the idle time slot in the first second signal frame. Position, the second communication device is based on a free time slot in the first first signal frame The time position determines the temporal position of the pilot in the second second signal frame. The other descriptions of adjusting the time position of the idle time slot or the pilot are similar, and are not described herein again.

S102. The first communications device sends the first signal frame.

S103. The first communications device receives the co-channel interference signal of the first signal frame.

S104. The first communications device estimates a co-channel interference multipath channel of the first communications device according to the pilot in the co-channel interference signal of the first signal frame, and performs co-channel interference cancellation.

Referring to FIG. 6, since the co-channel interference signal of the first signal frame is a multipath signal, the co-channel interference signal generated by the pilot in the first signal frame is also a multipath signal, assuming that the first communication device receives The time of the idle time slot in the second signal frame is t ₀ , and in the time range of (t ₀ , t ₀ +Δτ _P1 ), the first communication device can receive the multipath co-channel interference frame of the first signal frame. Pilots in the form of multipath signals.

The first communication device may estimate the co-channel interference multipath channel by using known information in the pilot in the first signal frame, and reconstruct the interference cancellation signal according to the estimated result, and use the interference cancellation signal to cancel the same in the received signal Frequency interference multipath signals. The same-frequency interference cancellation according to the embodiment of the present invention may include not only the same-frequency interference cancellation in multipath channel estimation, but also the same-frequency interference cancellation when transmitting service data.

The duplex communication method provided by the embodiment of the present invention, the first communication device determines the time position of the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame sent by the second communication device, so that The time at which the communication device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time in the idle time slot in the second signal frame, because the idle time slot energy in the second signal frame is zero or Very small, does not affect the pilot in the first signal frame, so the first communication device can estimate the co-channel interference of the first communication device according to the pilot in the co-channel interference signal of the received first signal frame. Multipath channels, and performing co-channel interference cancellation, eliminates co-channel interference caused by multipath in the signal propagation channel.

Optionally, referring to FIG. 7, before the step S101, the duplex communication method further includes S105:

S105. The first communication device detects a channel environment change, when the channel environment changes drastically. The first communication device begins to determine the temporal position of the pilot in the first signal frame based on the temporal position of the idle time slot in the second signal frame.

Specifically, a possible implementation manner is that the first communications device calculates the co-channel interference energy according to the pilot in the co-channel interference signal of the received first signal frame and the idle time slot in the received second signal frame. When the co-channel interference energy changes drastically, the channel environment changes drastically. Exemplarily, assuming that the time at which the first communication device receives the idle time slot in the second signal frame is t ₀ , the first communication device can only receive itself during (t ₀ , t ₀ + Δτ _S2 ) time. The same communication device detects the channel environment change by detecting the energy of the received co-channel interference. When the co-channel interference energy changes drastically, the estimation of the co-channel interference multi-path channel is started, that is, the step S101 is started. The temporal position of the pilot in the first signal frame is determined based on the temporal position of the idle time slot in the second signal frame. By this method, the point in time at which the multipath channel estimation starts can be determined.

Another possible implementation manner is that the first communication device detects a channel environment change by detecting a change in the received signal quality of the second communication device, and indicates a channel environment when the received signal quality of the second communication device changes drastically. The violent change starts to estimate the co-channel interference multipath channel, that is, the time position of the pilot in the first signal frame is determined according to the time position of the idle time slot in the second signal frame described in step S101. The signal quality can be characterized by MSE (English full name: mean squared error, Chinese full name: mean square error), EVM (English full name: error vector magnitude, Chinese full name: vector amplitude error) and other parameters. In this method, the point in time at which multipath channel estimation begins is determined.

The first communication device detects that the channel environment change is further used to determine whether the current estimation and the same-frequency interference cancellation effect are valid after the same-frequency interference multipath channel is estimated and the same-frequency interference cancellation is performed, so that the first transmission is performed for the next round. The time slot of the idle time slot or pilot in the signal frame is adjusted.

For the second communication device, the second communication device can detect changes in the channel environment to determine when the second communication device initiates estimation of the co-channel interference multipath channel.

Specifically, a possible implementation manner is to use pilot and idle time slots to calculate the energy of the received signal. Assuming that the time at which the second communication device receives the idle time slot in the first signal frame is t ₁ , the second communication device can only receive its own co-channel interference during (t ₁ , t ₁ + Δτ _S1 ) time. The second communication device detects the current channel environment by detecting the energy of the received co-channel interference.

Another possible implementation manner is that the second communication device detects a change in the channel environment by detecting a change in the received signal quality of the first communication device, thereby determining a change in the channel environment. Signal quality can be characterized by parameters such as MSE and EVM.

Similarly, the second communication device detects that the channel environment change is further used to determine whether the current estimation and the same-frequency interference cancellation effect are valid after the same-frequency interference multipath channel is estimated and the same-frequency interference cancellation is performed, so as to be sent to the next round. The time slot of the idle time slot or pilot in the second signal frame is adjusted.

In the case where the channel is stable, the multipath co-channel interference channel may not be temporarily estimated. Therefore, in order to transmit the traffic at the maximum rate, other overhead and service data may be temporarily inserted at the pilot and idle slot positions of the signal frame. . And when the channel is stable, when the service data is transmitted, the same-frequency interference cancellation can be performed by using the result of the multipath channel estimation described above.

Optionally, in step S101, in order to enable the receiver of the first communication device or the second communication device to accurately estimate the co-channel interference multipath channel, the time of the idle time slot in the signal frame sent by the local communication device The length of the pilot is not less than the length of the pilot in the signal frame transmitted by the opposite communication device, such that the pilot in the first signal frame can fall into the idle time slot in the second signal frame. Specifically, the time length Δτ _S1 of the idle time slot in the first signal frame is greater than or equal to the time length Δτ _P2 of the pilot in the second signal frame; and the time length Δτ _S2 of the idle time slot in the second signal frame is greater than or equal to the first time The length of time Δτ _P1 of the pilot in a signal frame, namely:

τ _S1 ≥τ _P2 formula (5)

τ _S2 ≥τ _P1 formula (6)

Further, in order to reduce the time position of the pilot and the idle time slot frequently, the time length Δτ _{f1 of the} first signal frame may be equal to the time length Δτ _{f2 of the} second signal frame, or the time of the first signal frame. The length Δτ _f1 and the time length Δτ _{f2 of the} second signal frame may be an integer multiple relationship, namely:

Δτ _f1 =k ₁ ·Δτ _f2 ,k ₁ =1,2,3,... Equation (7)

or

Optionally, there may be only pilots or only idle slots in the first signal frame or the second signal frame.

Exemplarily, referring to FIG. 8 (a), is a schematic diagram of a communication frame received by the first communication device, referring to FIG. 8 (b), a schematic diagram of a communication frame received by the second communication device, The length of the first signal frame is twice the length of the second signal frame, and there are only idle slots in the first second signal frame, and only pilots in the second second signal frame.

Optionally, the pilot or idle time slot in the first signal frame or the second signal frame may be located at the beginning of the frame, at the end of the frame, or at any position in the frame.

Exemplarily, referring to FIG. 9 (a), is a schematic diagram of a communication frame received by the first communication device, referring to FIG. 9 (b), a schematic diagram of a communication frame received by the second communication device, The time length of the first signal frame is equal to the time length of the second signal frame, and the pilot in the first signal frame is located in the frame header, and the pilot in the second signal frame is located in the frame header, in the first signal frame. The idle time slot is located anywhere in the frame, and the free time slot in the second signal frame is located at the end of the frame. Referring to FIG. 10(a), a schematic diagram of a communication frame received by the first communication device, as shown in FIG. 10(b), is a schematic diagram of a communication frame received by the second communication device, where The length of the signal frame is equal to the length of time of the second signal frame. The pilot and idle time slots in the first signal frame are located in the frame, and the pilot and idle time slots in the second signal frame are located in the frame.

In addition, it can be seen from FIGS. 8(a), 9(a) and 10(a) that the pilot in the co-channel interference signal of the first signal frame received by the first communication device is received by the first communication device. The idle time slot time in the second signal frame is the same; as can be seen from the co-channel interference signals of the second signal frame received by the second communication device, as shown in FIGS. 8(b), 9(b) and 10(b) The pilot is the same as the idle slot time in the first signal frame received by the second communication device.

Optionally, in step S101, when the co-channel interference multipath channel changes due to the change of the obstacle position in the communication channel, that is, t _{d1 in the} formula (3) and t _d2 in the formula (4) occur. When the change is made such that the formulas (3) and (4) are no longer satisfied, the position of the pilot or time slot in the first signal frame sent by the first communication device needs to be adjusted, and the second signal sent by the second communication device needs to be adjusted. The position of the pilot or time slot in the frame.

Optionally, a possible implementation manner is: the first communications device adjusts a value of a time position Δt _P1 of the pilot in the first signal frame, so that Equation (3) is still established; and the second communications device adjusts the second signal frame. The value of the time position Δt _P2 of the pilot in the equation makes equation (4) still true. The technical effect achieved by the design is that the first side of the first communication device or the second communication device can completely receive the pilot in the co-channel interference signal of the local side in the idle time slot sent by the opposite side transmitter.

Optionally, another possible implementation manner is: the first communication device adjusts a value of a time position Δt _S1 of the idle time slot in the first signal frame, so that formula (4) is still established; and the second communication device adjusts the second The value of the time position Δt _S2 of the idle time slot in the signal frame is such that equation (3) still holds. The technical effect achieved by the design is that the opposite receiver of the first communication device or the second communication device can completely receive the pilot in the contra-frequency co-channel interference signal in the idle time slot transmitted by the transmitter on the side.

Optionally, another possible implementation manner is: the second communications device adjusts a value of a time position Δt _P2 of the pilot in the second signal frame, and the first communications device adjusts a time of the idle time slot in the first signal frame. The value of position Δt _S1 is such that equation (4) still holds; the first communication device adjusts the value of the time position Δt _P1 of the pilot in the first signal frame, and the second communication device adjusts the free time slot in the second signal frame The value of the time position Δt _S2 is such that equation (3) still holds. The technical effect achieved by the design is that the first side of the first communication device or the second communication device can completely receive the pilot in the co-channel interference signal of the local side in the idle time slot sent by the opposite side transmitter. At the same time, the opposite receiver can completely receive the pilot in the contra-frequency co-channel interference signal in the idle time slot sent by the transmitter on the side.

Optionally, referring to FIG. 7, after the step S104, the method further includes:

S106. The first communications device adjusts the pilot in the first signal frame according to the last multipath signal in the pilot in the co-channel interference signal of the received first signal frame that exceeds the first preset energy threshold ε _th1 Length of time.

Assuming that the multipath of the multipath of the signal frame interferes with the multipath, the time at which the local communication device receives the idle slot in the signal frame of the contralateral communication device is t ₀ , then (t ₀ , t ₀ + Δτ _P ) Within the time range, there are N multipath signals including the multipath signal that first arrives at the receiver and the multipath signal that arrives at the receiver first. Then, the time length Δτ _P of the pilot in the signal frame needs to satisfy the following conditions:

Δτ _P ·F≥N Equation (9)

Where F(Samples/s, number of symbols/second) is the symbol rate in the communication system.

Due to the large relative delay between the multipath and interfering signals of the signal frame, the time length Δτ _P of the initially determined pilot may not contain all the main interfering signals, so the length of time Δτ of the pilot needs to be adjusted. _P , such that the co-channel interference cancellation residual within the time length Δτ _P of the pilot in the adjusted first signal frame is less than the second predetermined energy threshold ε _th2 .

It should be noted that, considering the baseband processing capability of the communication system, when performing the same-frequency interference cancellation, only the main, more powerful multipath co-channel interference can be offset, for example, the first communication device only needs to receive the first The multipath signal of the same frequency interference signal of the signal frame satisfies the following condition to perform the same frequency interference cancellation, so that the co-channel interference cancellation residual is lower than the second preset energy threshold ε _th2 : the energy exceeds the first preset energy threshold ε _th1 The first multipath signal and the last multipath signal, and the multipath signal between the first multipath signal and the last multipath signal. This balances system performance and overhead. Exemplarily, for the first communication device, referring to FIG. 11, it is assumed that the time at which the first communication device receives the idle time slot in the second signal frame is t ₀ , then (t ₀ , t ₀ + Δτ _{In the} time range of _P1 ), the first communication device does not consider the multipath signal with lower energy, and only estimates the multipath signal with higher energy and the same frequency interference. At this time, the pilot time length Δτ _P1 needs to satisfy the following conditions:

Δτ _P1 ·F≥N _max formula (10)

Where N _max is the number of consecutive multipaths between (including) the multipath signals of the first and last pilots in the co-channel interference signal of the first signal frame exceeding the first preset energy threshold ε _th1 . In Fig. 11, N _max is 20.

Further, when a plurality of obstacles are included in the channel, and the distance between the obstacles is relatively long, there may be a large delay between the multipath co-channel interference signals caused by different obstacles, so that the first There is also one or more multipath signals having a lower energy than the first predetermined energy threshold ε _th1 between the multipath signals of the strip and the last energy exceeding the first preset energy threshold ε _th1 . If the length of the pilot is set according to the number of consecutive multipaths between the first and last multipath signals exceeding the first preset energy threshold ε _th1 , the pilot will continue in the same signal frame. The time is too long, that is, the number of pilots is too much.

Therefore, in order to reduce the number N _max of continuous multipaths between (including) the multipath signals of the first and last energy exceeding the first preset energy threshold ε _th1 , to save the first signal frame and the second signal frame For computing resources and time-frequency resources, as shown in FIG. 12, N _max multipath co-channel interferences in the above (t ₀ , t ₀ + Δτ _P1 ) time range can be divided into n groups of sub-interferences, and each group of sub-interferences The energy of the first sub-interference and the last sub-interference is higher than the first preset energy threshold ε _th1 . Further, one or more sub-interferences in each group of sub-interferences may be lower than the first preset energy threshold ε _th1 . Assuming that the number of multipaths in each subinterference is N ₁ , N ₂ ..., N _k , (k = 2, 3, 4, ...), the following formula is satisfied:

N ₁ +N ₂ +...+N _k ≤N _max ,k=2,3,4,... Formula (11)

At the multipath below the first preset energy threshold ε _th1 between each group of sub-interferences, since the co-channel interference channel estimation is not required, the first signal frame and the second signal frame may be filled with other overhead and service data frames. The corresponding position in the signal frame. The first signal frame includes at least one pilot and at least one time slot, and the number of idle time slots in the first signal frame is the same as the number of pilots in the second signal frame sent by the second communication device, the first signal The number of pilots in the frame is the same as the number of free slots in the second signal frame transmitted by the second communication device.

Alternatively, since the co-channel interference channel may change faster due to the movement of the obstacle, referring to FIG. 7, the above-described duplex communication method further includes steps S107 and S108:

S107. The first communications device determines the co-channel interference cancellation by detecting a co-channel interference cancellation residual or a received signal quality of the second communications device (eg, MSE, EVM, etc.) stability.

After selecting the time length Δτ _P of the pilot in the first signal frame on the local side, if the same-frequency interference cancellation residual variation is found to be large or the received signal quality of the second communication device changes greatly, the same-frequency interference is indicated. The channel environment changes greatly, and the stability of co-channel interference cancellation is poor. Within a given time length Δτ _f1 of the first signal frame, the change of the same-frequency interference channel cannot be quickly tracked.

S108. If the stability of the co-channel interference cancellation is poor, the first communication device decreases the time length Δτ _{f1 of the} first signal frame, so that the co-channel interference cancellation residual or the received peer signal quality remains stable.

The solution provided by the embodiment of the present invention is mainly introduced from the perspective of interaction between the network elements. It can be understood that each network element, such as the first communication device and the second communication device, etc., in order to implement the above functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiment of the present invention may divide the function modules of the first communication device and the second communication device according to the foregoing method example. For example, each function module may be divided according to each function, or two or more functions may be integrated in the function. In a processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module 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.

FIG. 13 is a schematic diagram showing a possible configuration of the first communication device involved in the foregoing embodiment. The first communication device 11 includes: a determining unit 1111 and a sending unit. 1112, receiving unit 1113. Estimation unit 1114, detection unit 1115, and adjustment unit 1116. The determining unit 1111 is configured to support the first communication device 11 to perform the process S101 in FIG. 5, and the process S101 in FIG. 7; the sending unit 1112 is configured to support the first communication device 11 to perform the process in FIG. 5 in the process S102 in FIG. S102; the receiving unit 1113 is configured to support the first communication device 11 to perform the process S103 in FIG. 5, the process S103 in FIG. 7; the estimating unit 1114 is configured to support the first communication device 11 to perform the process S104 in FIG. 5, in FIG. Process S104; the detecting unit 1115 is configured to support the first communication device 11 to perform the processes S105, S107, S108 in FIG. 7; the adjusting unit 1116 is configured to support the first communication device 11 to perform the process S106 in FIG. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

In the case of employing an integrated unit, FIG. 14 shows a possible structural diagram of the first communication device involved in the above embodiment. The first communication device 11 includes a processing module 1122 and a communication module 1123. The processing module 1122 is configured to perform control management on the action of the first communications device. For example, the processing module 1122 is configured to support the first communications device 11 to perform the processes S101, S103, and S104 in FIG. 5, and the processes S101 and S103 in FIG. S104, S105, S106, S107, S108 and/or other processes for the techniques described herein. The communication module 1123 is for supporting communication between the first communication device 11 and other network entities, such as communication with the functional modules or network entities shown in FIG. The first communication device 11 may further include a storage module 1121 for storing program codes and data of the first communication device.

The processing module 1122 can be a processor or a controller, for example, a central processing unit (English name: central processing unit, English abbreviation: CPU), a general-purpose processor, a digital signal processor (English full name: digital signal processor, English) Abbreviation: DSP), ASIC (application-specific integrated circuit, English abbreviation: ASIC), field programmable gate array (English full name: field programmable gate array, English abbreviation: FPGA) or other programmable logic devices, Transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, such as Contains one or more microprocessor combinations, a combination of DSP and microprocessor, and more. The communication module 1123 can be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 1121 can be a memory.

When the processing module 1122 is a processor, the communication module 1123 is a transceiver, and the storage module 1121 is a memory, the first communication device according to the embodiment of the present invention may be the first communication device shown in FIG.

Referring to FIG. 15, the first communication device 11 includes a processor 1132, a transceiver 1133, a memory 1131, and a bus 1134. The transceiver 1133, the processor 1132, and the memory 1131 are mutually connected by a bus 1134; the bus 1134 may be a peripheral component interconnect standard (English full name: peripheral component interconnect, English abbreviation: PCI) bus or an extended industry standard structure (English full name) :extended industry standard architecture, English abbreviation: EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 15, but it does not mean that there is only one bus or one type of bus.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware, or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

Those skilled in the art should be aware that in one or more of the above examples, The functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the protection, any modifications, equivalent substitutions, improvements, etc., which are made on the basis of the technical solutions of the present invention, are included in the scope of the present invention.

Claims

A duplex communication method, the method comprising:

Determining, by the first communications device, a temporal location of a pilot in the first signal frame according to a temporal location of the idle time slot in the second signal frame transmitted by the second communications device, wherein a time of the pilot in the first signal frame The location is satisfied: the time when the first communication device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time when the idle time slot in the second signal frame is received;

Transmitting, by the first communications device, the first signal frame;

Receiving, by the first communications device, a co-channel interference signal of the first signal frame;

The first communications device estimates a co-channel interference multipath channel of the first communications device according to pilots in the co-channel interference signal of the first signal frame, and performs co-channel interference cancellation.
The method according to claim 1, wherein the time position of the pilot in the first signal frame is satisfied: the first communication device receives the guide in the co-channel interference signal of the first signal frame The time of the frequency is the same as the time of receiving the idle time slot in the second signal frame, including:

The time position of the pilot in the first signal frame satisfies the formula t d1 +Δt P1 +mΔτ f1 =t 2 +Δt S2 +nΔτ f2 ,m,n=0,1,2,3..., And t d1 is a time when the first communication device receives the first arrival main path of the co-channel interference signal of the first signal frame, and Δt P1 is a time position of the pilot in the first signal frame, Δτ f1 For the length of time of the first signal frame, t 2 is the time when the first communication device receives the frame header of the second signal frame, and Δt S2 is the time of the idle time slot in the second signal frame. The position, Δτ f2 is the length of time of the second signal frame.
The method according to claim 1, wherein the first communication device determines the time position of the pilot in the first signal frame according to the temporal position of the idle time slot in the second signal frame transmitted by the second communication device. ,include:

The first communication device detects energy of the received symbol;

Determining that a free time slot of the second signal frame is received when the energy of the received symbol suddenly decreases and continuously continues for a plurality of symbols;

Performing a correlation peak operation on the same-frequency interference signal in the idle time slot of the second signal frame and the pilot in the first signal frame, and adjusting the time position of the pilot in the first signal frame, when When the maximum correlation peak occurs, the time position of the pilot in the first signal frame is adjusted.
The method according to claim 1, wherein the time at which the first communication device determines the pilot in the first signal frame according to the time position of the idle time slot in the second signal frame transmitted by the second communication device Before the location, the method further includes:

The first communication device detects a channel environment change, and when the channel environment changes drastically, the first communication device starts to determine a pilot in the first signal frame according to a time position of a free time slot in the second signal frame. Time location.
The method according to claim 4, wherein said first communication device detects a change in channel environment, and said first communication device starts to start according to a free time slot in said second signal frame when the channel environment changes drastically The temporal position determines a temporal location of the pilot in the first signal frame, including:

The first communications device calculates co-channel interference energy according to the received pilot in the co-channel interference signal of the first signal frame and the received idle time slot in the second signal frame, when When the intra-frequency interference energy changes drastically, the first communications device begins determining a temporal location of the pilot in the first signal frame based on a temporal location of the idle time slot in the second signal frame.
The method according to claim 4, wherein said first communication device detects a change in channel environment, and said first communication device starts to start according to a free time slot in said second signal frame when the channel environment changes drastically The temporal position determines a temporal location of the pilot in the first signal frame, including:

The first communication device detects a change in a channel environment by detecting a change in received signal quality from the second communication device, and when the received signal quality of the second communication device changes drastically, the first A communications device begins determining a temporal location of pilots in the first signal frame based on a temporal location of the idle time slots in the second signal frame.
The method of claim 1 further comprising:

The first communication device adjusts the pilot in the first signal frame according to the last multipath signal in which the energy in the pilot in the co-channel interference signal of the received first signal frame exceeds the first preset energy threshold Length of time.
The method of claim 7 wherein:

The time length Δτ P1 of the pilot in the first signal frame satisfies the formula Δτ P1 ·F≥N max , where N max is the first of the pilots in the co-channel interference signal of the first signal frame The number of consecutive multipaths between the multipath signals whose last energy exceeds the first predetermined energy threshold, the F symbol rate.
The method of claim 7 wherein said performing co-channel interference cancellation comprises:

The first communication device performs co-channel interference cancellation on a multipath signal that satisfies the following conditions in the same-frequency interference signal of the first signal frame: a first multipath signal whose energy exceeds the first preset energy threshold And a last multipath signal, and a multipath signal whose energy between the first multipath signal and the last multipath signal exceeds the first preset energy threshold.
The method of claim 1 further comprising:

The first communication device determines the stability of the co-channel interference cancellation by detecting a co-channel interference cancellation residual or a received signal quality of the second communication device;

If the stability of the co-channel interference cancellation is poor, the first communication device decreases the length of time of the first signal frame.
The method of claim 1 wherein

The length of the idle time slot in the second signal frame is greater than or equal to the length of time of the pilot in the first signal frame.
A duplex communication method, the method comprising:

Determining, by the first communications device, a temporal position of the idle time slot in the first signal frame according to a time position of a pilot in the second signal frame sent by the second communications device, where idle time in the first signal frame The time position of the slot satisfies: the time at which the second communication device receives the pilot in the co-channel interference signal of the second signal frame and receives the The time of the idle time slot in a signal frame is the same;

Transmitting, by the first communications device, the first signal frame, where the idle time slot of the first signal frame is used by the second communications device according to a pilot estimation scheme in a co-channel interference signal of the second signal frame The co-channel interference multipath channel of the second communication device is described, and co-channel interference cancellation is performed.
The method according to claim 12, wherein the temporal position of the idle time slot in the first signal frame is satisfied: the second communication device receives the same frequency interference signal of the second signal frame The time of the pilot is the same as the time of receiving the idle time slot in the first signal frame, including:

The transmission time of the idle time slot in the first signal frame satisfies t d2 +Δt P2 +qΔτ f2 =t 1 +Δt S1 +pΔτ f1 ,p,q=0,1,2,3..., And t d2 is a time when the second communication device receives the first arrival main path of the co-channel interference signal of the second signal frame, and Δt P2 is a time position of the pilot in the second signal frame, Δτ f2 For the length of time of the second signal frame, t 1 is the time when the second communication device receives the frame header of the first signal frame, and Δt S1 is the time of the idle time slot in the first signal frame. The position, Δτ f1 is the length of time of the first signal frame.
The method of claim 12 wherein:

The length of the idle time slot in the first signal frame is greater than or equal to the time length of the pilot in the second signal frame.
The method according to claim 12, wherein the first communication device determines an idle time in the first signal frame according to a time position of a pilot in a second signal frame sent by the second communication device The time position of the gap, including:

The first communication device adjusts a time position of a free time slot in the first signal frame;

The first communication device receives an acknowledgment message from the second communication device, where the acknowledgment message is used to indicate that the time position of the idle time slot in the first signal frame is adjusted, wherein the acknowledgement message is the second The communication device performs a correlation peak operation on the received co-channel interference signal in the idle time slot of the first signal frame and the pilot signal in the second signal frame, and when the maximum correlation peak occurs, the second Transmitting by the communication device; the idle time slot of the first signal frame is used by the second communication device to detect the energy of the received symbol, when When the energy of the received symbol suddenly decreases and continues for a plurality of symbols continuously, then the second communication device determines to receive the idle time slot of the first signal frame.
A first communication device, wherein the first communication device comprises:

a determining unit, configured to determine a time position of a pilot in the first signal frame according to a time position of the idle time slot in the second signal frame sent by the second communication device, where the pilot in the first signal frame The time position is satisfied: the time when the first communication device receives the pilot in the co-channel interference signal of the first signal frame is the same as the time when the idle time slot in the second signal frame is received;

a sending unit, configured to send the first signal frame;

a receiving unit, configured to receive a co-channel interference signal of the first signal frame;

And an estimating unit, configured to estimate a co-channel interference multipath channel of the first communications device according to pilots in the co-channel interference signal of the first signal frame, and perform co-channel interference cancellation.
The device according to claim 16, wherein the determining unit is specifically configured to:

Determining a time position of a pilot in the first signal frame according to a temporal position of the idle time slot in the second signal frame sent by the second communication device, wherein a time position of the pilot in the first signal frame satisfies a formula d1 + Δt P1 + mΔτ f1 = t 2 + Δt S2 + nΔτ f2, m, n = 0,1,2,3 ..., wherein, t d1 receiving the first signal for said first communication device The time when the first co-channel interference signal of the frame reaches the main path, Δt P1 is the time position of the pilot in the first signal frame, Δτ f1 is the time length of the first signal frame, and t 2 is the The time at which the first communication device receives the frame header of the second signal frame, Δt S2 is the time position of the idle time slot in the second signal frame, and Δτ f2 is the time length of the second signal frame.
The device according to claim 16, wherein the determining unit is specifically configured to:

Detecting the energy of the received symbol;

When the energy of the received symbol suddenly drops and continues for multiple symbols in succession, Receiving an idle time slot of the second signal frame;

Performing a correlation peak operation on the same-frequency interference signal in the idle time slot of the second signal frame and the pilot in the first signal frame, and adjusting the time position of the pilot in the first signal frame, when When the maximum correlation peak occurs, the time position of the pilot in the first signal frame is adjusted.
The device according to claim 16, wherein the first communication device further comprises:

a detecting unit, configured to detect a channel environment change, when the channel environment changes drastically, the first communications device starts to determine a pilot in the first signal frame according to a time position of a free time slot in the second signal frame. Time location.
The device according to claim 19, wherein the detecting unit is specifically configured to:

Calculating co-channel interference energy according to the received pilot in the co-channel interference signal of the first signal frame and the received idle time slot in the second signal frame, when the co-channel interference energy changes drastically The first communications device begins determining a temporal location of pilots in the first signal frame based on a temporal location of the idle time slots in the second signal frame.
The device according to claim 19, wherein the detecting unit is specifically configured to:

Detecting a change in the channel environment by detecting a change in the received signal quality from the second communication device, the first communication device starting to change according to the received signal quality of the second communication device The temporal position of the idle time slot in the second signal frame determines the temporal position of the pilot in the first signal frame.
The device according to claim 16, wherein the first communication device further comprises:

And an adjusting unit, configured to adjust, according to the last multipath signal of the pilot in the co-channel interference signal of the first signal frame that exceeds the first preset energy threshold, the pilot in the first signal frame length of time.
The device according to claim 22, characterized in that

The time length Δτ P1 of the pilot in the first signal frame satisfies the formula Δτ P1 ·F≥N max , where N max is the first of the pilots in the co-channel interference signal of the first signal frame The number of consecutive multipaths between the multipath signals whose last energy exceeds the first predetermined energy threshold, the F symbol rate.
The device according to claim 22, wherein the estimating unit is specifically configured to:

And performing multi-path interference cancellation on the multi-path signal satisfying the following condition in the same-frequency interference signal of the first signal frame: the first multi-path signal and the last multi-path signal whose energy exceeds the first preset energy threshold, And a multipath signal in which the energy between the first multipath signal and the last multipath signal exceeds the first preset energy threshold.
The device according to claim 16, wherein the first communication device further comprises:

The detecting unit is further configured to determine the stability of the co-channel interference cancellation by detecting a co-channel interference cancellation residual or a received signal quality of the second communication device;

If the stability of the co-channel interference cancellation is poor, the length of time of the first signal frame is reduced.
The device of claim 16 wherein:

The length of the idle time slot in the second signal frame is greater than or equal to the length of time of the pilot in the first signal frame.
A first communication device, wherein the first communication device comprises:

a determining unit, configured to determine, according to a time position of a pilot in the second signal frame sent by the second communications device, a time position of the idle time slot in the first signal frame, where the first signal frame is idle The time position of the time slot is satisfied: the time at which the second communication device receives the pilot in the co-channel interference signal of the second signal frame is the same as the time at which the idle time slot in the first signal frame is received;

a sending unit, configured to send the first signal frame, where the idle time slot of the first signal frame is used by the second communications device according to the same frequency interference signal of the second signal frame The pilot estimates the co-channel interference multipath channel of the second communication device and performs co-channel interference cancellation.
The device according to claim 27, wherein the determining unit is specifically configured to:

Determining, according to a temporal position of a pilot in the second signal frame sent by the second communication device, a temporal position of the idle time slot in the first signal frame, and a transmission time of the idle time slot in the first signal frame Satisfying t d2 +Δt P2 +qΔτ f2 =t 1 +Δt S1 +pΔτ f1 ,p,q=0,1,2,3..., wherein t d2 is the second communication device receiving the first The time of the first arriving main path of the co-channel interference signal of the two signal frames, Δt P2 is the time position of the pilot in the second signal frame, and Δτ f2 is the time length of the second signal frame, t 1 is The time at which the second communication device receives the frame header of the first signal frame, Δt S1 is the time position of the idle time slot in the first signal frame, and Δτ f1 is the time length of the first signal frame .
The device according to claim 27, wherein

The length of the idle time slot in the first signal frame is greater than or equal to the time length of the pilot in the second signal frame.
The device according to claim 27, wherein the determining unit is specifically configured to:

Adjusting a time position of a free time slot in the first signal frame;

Receiving an acknowledgment message from the second communication device, the acknowledgment message being used to indicate that the time position of the idle time slot in the first signal frame is adjusted, wherein the acknowledgment message is received by the second communication device The co-channel interference signal in the idle time slot of the first signal frame and the pilot in the second signal frame perform a correlation peak operation, and when the maximum correlation peak occurs, the second communication device transmits; The idle time slot of the first signal frame is used by the second communication device to detect the energy of the received symbol, and when the energy of the received symbol suddenly decreases and continuously continues for multiple symbols, the second communication device determines to receive the received The idle time slot of the first signal frame.
A communication system, comprising the first communication device according to any one of claims 16-26, or the first communication device according to any one of claims 27-30.