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A method for transmitting and receiving slotted aloha system based on interference cancellation

A technology of interference elimination and receiving method, which is applied in the field of satellite communication, can solve problems such as users are far apart, cannot allocate time slot message collision, and are not in the line of sight, so as to achieve the effect of reducing the impact of receiving performance

Active Publication Date: 2019-05-31
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the satellite system, the system delay is high, and different users are far apart or even out of line of sight. Users cannot reasonably allocate time slots and eliminate interference caused by message collisions by listening to the carrier and reserving time slots.

Method used

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  • A method for transmitting and receiving slotted aloha system based on interference cancellation
  • A method for transmitting and receiving slotted aloha system based on interference cancellation
  • A method for transmitting and receiving slotted aloha system based on interference cancellation

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Embodiment Construction

[0046] The present invention provides a method for sending and receiving signals of a time slot ALOHA system, the method comprising the establishment of a receiving model of the time slot ALOHA system and the method for sending and receiving signals of the receiving model of the time slot ALOHA system; wherein, the signal is in the sending process Randomly use different training sequences as the synchronization of the receiving end, and estimate the distribution of each message in the time slot through the synchronization of the training sequence at the receiving end; finally restore each message through the interference elimination method, so as to recover in the event of a message collision The message of each user; the following will be explained in conjunction with the accompanying drawings.

[0047] Such as figure 1 The schematic diagram of the distribution of the time slot ALOHA receiving messages in the limited time slots is shown. The figure shows a schematic diagram ...

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Abstract

The invention discloses a slotted ALOHA system signal sending and receiving method based on interference elimination, and belongs to the technical field of satellite communication. The method comprises establishing a receiving model of slotted ALOHA, and a signal sending and receiving method for the receiving model of the ALOHA system. In a signal sending process of the receiving model of the slotted ALOHA, each message randomly selects a plurality of slots to be repeatedly sent in a frame, different messages randomly select different training sequences used for synchronization of a receiving end, and arrival time delay of each message is estimated through correlation operation on the receiving end. Finally, the receiving model is used to eliminate interference, to realize to recover each user message under the condition that message collision occurs. The method is suitable for a slotted ALOHA system, such as a very high frequency data exchange system VDES, a satellite ship automatic identification system SAT-AIS, and a satellite internet of things, and the method obviously improve capacity of the slotted ALOHA system.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, in particular to a transmission and reception method of a time slot ALOHA system based on interference elimination. Specifically, it is a time slot interference elimination algorithm of a time slot ALOHA system. Background technique [0002] The time-slotted ALOHA protocol is applied in the satellite data exchange system represented by the automatic identification system (AIS), the satellite VDES (VDES) and the satellite Internet; the ALOHA protocol is a kind of random storage protocol, which is divided into Pure ALOHA protocol and slotted ALOHA protocol. Among them, the pure ALOHA protocol stipulates that the multiple access mode of different users is the time division multiplexing (TDMA) mode. Each user transmits a signal when there is a need to transmit a message. If the signal is successfully received, the receiving end returns an acknowledgment character (ACK) to the user, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B7/155H04B7/185
CPCH04B1/1036H04B7/15585H04B7/1851
Inventor 倪祖耀梁煜吴胜匡麟玲
Owner TSINGHUA UNIV
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