Channel selection method and communication system for single-antenna spatial hidden diversity scattering

Abstract

The present invention provides a channel selection method and communication system for single-antenna spatial hidden diversity scattering, relating to the field of scattering communication technology. The system includes terminal A and terminal B, each of which includes a communication terminal and a single-beam phased array antenna; the communication terminal is used to complete service access, communication protocol processing, modulation and demodulation, and up and down conversion processing; the single-beam phased array antenna scans the azimuth and / or elevation angle under the control of the communication terminal, and the scanning process sequentially undergoes signaling time slot 1, signaling time slot 2, data time slot 1, signaling time slot 3, signaling time slot 4, and data time slot 2. The present invention can achieve high-speed transmission of tropospheric scattering communication without increasing the device volume or the occupied bandwidth, and is suitable for scenarios such as point-to-point scattering communication and point-to-multipoint scattering communication.

Description

Technical Field

[0001] The present invention relates to the technical field of scattering communication, and in particular to a method for realizing optimal channel selection by utilizing rapid scanning of a single-beam phased array antenna. Background Art

[0002] Tropospheric scatter communication is a form of wireless communication beyond line of sight (BLOS) that exploits the forward scattering effect of atmospheric inhomogeneities on radio waves. Tropospheric scatter offers advantages such as long single-hop distance, wide available frequency band, high communication capacity, low investment and maintenance costs, strong channel reliability, and robustness against interference and interception. It has become an effective means of communication for both military and civilian applications.

[0003] Scattering communication channels are influenced by the tropospheric atmosphere and exhibit random fading. To mitigate the impact of channel fading on communications, multi-antenna spatial diversity, angular diversity, frequency diversity, time diversity, and combinations thereof are commonly employed. Multi-antenna diversity requires the use of two or more antennas, increasing device size and power consumption; angular diversity requires the addition of multiple feeds and deviates the beam's geometric orientation; frequency diversity increases the system's spectrum resources; and time diversity involves sending the same data multiple times over time and combining them at the receiving end, resulting in a decrease in transmission rate. Summary of the Invention

[0004] The purpose of the present invention is to avoid the deficiencies in the above-mentioned background technology and to provide a channel selection method and communication system for single-antenna spatial hidden diversity scattering, which can achieve high-speed transmission of tropospheric scattering communication without increasing the device volume or the occupied bandwidth.

[0005] The technical solution adopted in the present invention is:

[0006] A channel selection method for single-antenna spatial hidden diversity scattering uses a single-beam phased array antenna to scan in azimuth and / or elevation. The scanning process sequentially goes through signaling time slot 1, signaling time slot 2, data time slot 1, signaling time slot 3, signaling time slot 4, and data time slot 2, and the time slot arrangement repeats in a cycle, wherein:

[0007] In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A.

[0008] In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2.

[0009] In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data.

[0010] In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B.

[0011] In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4.

[0012] In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data.

[0013] Among them, the number of transmitted wave positions N and the number of received wave positions M satisfy the relationship: N+M≥3. When M or N is 1, it means that the beam of this end station remains stationary. When M or N is greater than 1, it means switching scanning on M or N wave positions.

[0014] A single-antenna spatially hidden diversity scattering communication system includes an end station A and an end station B, each end station including a communication terminal and a single-beam phased array antenna; the communication terminal is used to complete service access, communication protocol processing, modulation and demodulation, and up / down conversion; the single-beam phased array antenna scans azimuth and / or elevation angles under the control of the communication terminal;

[0015] The time frame structure processed by the communication protocol includes signaling 1, signaling 2, data 1, signaling 3, signaling 4, and data 2. Each part corresponds to a time slot, and the time slots are arranged in a cycle, wherein:

[0016] In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A.

[0017] In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2.

[0018] In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data.

[0019] In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B.

[0020] In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4.

[0021] In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data.

[0022] Among them, the number of transmitted wave positions N and the number of received wave positions M satisfy the relationship: N+M≥3. When M or N is 1, it means that the beam of this end station remains stationary. When M or N is greater than 1, it means switching scanning on M or N wave positions.

[0023] The beneficial effects of the present invention compared with the background technology are as follows:

[0024] 1. The present invention realizes high-speed transmission with high spectrum efficiency of a single antenna for tropospheric scatter communication.

[0025] 2. Compared with the existing technology, the present invention provides a new diversity method that can achieve high-speed tropospheric scatter communication without increasing the device volume, weight, power consumption, or spectrum occupied bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the communication system of the present invention.

[0027] Figure 2 It is a schematic diagram of the communication protocol processing time slot. DETAILED DESCRIPTION

[0028] A single-antenna spatial hidden diversity scattering communication system, such as Figure 1 As shown, it includes terminal A and terminal B, each of which includes a communication terminal and a single-beam phased array antenna; the communication terminal is used to complete service access, communication protocol processing, modulation and demodulation, and up and down conversion processing; the single-beam phased array antenna scans azimuth and / or elevation angles under the control of the communication terminal;

[0029] The time frame structure processed by the communication protocol is as follows Figure 2 As shown, it includes signaling 1, signaling 2, data 1, signaling 3, signaling 4, and data 2. Each part corresponds to a time slot, where:

[0030] In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A.

[0031] In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2.

[0032] In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data.

[0033] In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B.

[0034] In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4.

[0035] In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data.

[0036] In this system, there are N transmit beams and M receive beams, resulting in M ​​× N available channel combinations. The number of transmit beams N and the number of receive beams M satisfy the relationship N + M ≥ 3. When M or N is 1, the local station's beam remains stationary. When M or N is greater than 1, scanning is switched between M or N beams.

[0037] The system uses a single-beam phased array antenna to scan in azimuth and / or elevation to select the best channel. The scanning process goes through signaling time slot 1, signaling time slot 2, data time slot 1, signaling time slot 3, signaling time slot 4, and data time slot 2 in sequence, where:

[0038] In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A.

[0039] In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2.

[0040] In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data.

[0041] In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B.

[0042] In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4.

[0043] In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data.

[0044] The number of transmitted wave positions N and the number of received wave positions M satisfy the relationship: N+M≥3. When M or N is 1, it means that the beam of this end station remains stationary. When M or N is greater than 1, it means switching scanning on M or N wave positions.

[0045] The present invention can achieve high-speed transmission of tropospheric scatter communication without increasing the volume of the equipment or the occupied bandwidth, and is suitable for scenarios such as point-to-point scatter communication and point-to-multipoint scatter communication.

Claims

1. A channel selection method for single-antenna spatial hidden diversity scattering, characterized in that: A single-beam phased array antenna is used to scan the azimuth and / or elevation angles. The scanning process goes through signaling time slot 1, signaling time slot 2, data time slot 1, signaling time slot 3, signaling time slot 4, and data time slot 2 in sequence. The time slot arrangement repeats in a cycle, where: In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A. In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2. In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data. In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B. In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4. In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data. Among them, the number of transmitted wave positions N and the number of received wave positions M satisfy the relationship: N+M≥3. When M or N is 1, it means that the beam of this end station remains stationary. When M or N is greater than 1, it means switching scanning on M or N wave positions.

2. A single-antenna spatial hidden diversity scattering communication system, characterized in that: The system comprises an end station A and an end station B, each end station comprising a communication terminal and a single-beam phased array antenna; the communication terminal is used to complete service access, communication protocol processing, modulation and demodulation, and up / down conversion processing; the single-beam phased array antenna performs azimuth and / or elevation scanning under the control of the communication terminal; The time frame structure processed by the communication protocol includes signaling 1, signaling 2, data 1, signaling 3, signaling 4, and data 2. Each part corresponds to a time slot, and the time slots are arranged in a cycle, wherein: In the signaling 1 time slot, terminal A periodically sends channel sounding information on N wave positions. Terminal B scans and receives on M different wave positions and records the best receiving wave position K1 and the best transmitting wave position K2 of terminal A. In the signaling 2 time slot, terminal B sends a handshake signal at the recorded optimal wave position K1, repeating N times. Terminal A scans and receives at N different wave positions. The handshake signal contains indications of the optimal wave positions K1 and K2. In the data 1 time slot, terminal A adjusts the beam to the optimal transmission position K2, while terminal B maintains the beam position K1. Terminal A sends service data, while terminal B receives service data. In the signaling 3 time slot, terminal B periodically sends channel sounding information on M wave positions. Terminal A scans and receives on N different wave positions and records the best receiving wave position K3 and the best transmitting wave position K4 of terminal B. In the signaling 4 time slot, terminal A sends a handshake signal at the best receiving wave position K3, which is recorded, and repeats it M times. Terminal B scans and receives at M different wave positions. The handshake signal contains the indication of the best wave positions K3 and K4. In the data 2 time slot, terminal B adjusts the beam to the optimal transmission beam position K4, while terminal A maintains the beam position K3. Terminal B sends service data, while terminal A receives service data. Among them, the number of transmitted wave positions N and the number of received wave positions M satisfy the relationship: N+M≥3. When M or N is 1, it means that the beam of this end station remains stationary. When M or N is greater than 1, it means switching scanning on M or N wave positions.

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