A short data packet ultra-reliable and low-latency transmission method enabled by a large-scale single-input multiple-output system

Abstract

The present invention provides a short data packet ultra-reliable low-delay transmission method enabled by a large-scale single-input multiple-output system, including: 1. Constructing a short data packet physical layer non-coherent transmission scheme with low signal processing delay; 2. 1. Obtain the instantaneous variance information of Gaussian white noise at the receiving end; 3. Using the noise variance information, under the constraints of signal modulation order and average power, determine the finite character constellation optimization problem of the adaptive link SNR; 4. The optimization problem It is transformed into a constellation structure design and bit allocation problem in a multi-dimensional parameter space; 5. Based on this transformation problem, for different modulation orders, determine the optimal constellation structure and bit allocation scheme for each parameter space; 6. In bit error rate and transmission Under the requirement of speed, the optimal configuration problem of the number of antennas at the receiving end is solved. The present invention can avoid channel estimation operation under fast-changing channel, make full use of space diversity and time coding gain, and realize ultra-reliable and low-delay transmission of short data packets.

Description

technical field [0001] The invention relates to the field of communication technologies, in particular to an ultra-reliable and low-latency transmission method for short data packets enabled by a large-scale single-input multiple-output system. Background technique [0002] Different from the current physical layer transmission mechanism of wireless communication, due to the strict requirements for delay, the main feature of the Ultra Reliable Low Latency Communications (URLLC) system is the transmission of short data packets, which will affect the current situation. The theoretical analysis methods of physical layer signal transmission and the design of coding and modulation schemes present the following two main challenges: (1) The traditional research and analysis on the transmission performance measurement of long data packets (long codes, long frames, etc.) based on channel capacity or channel interruption probability criteria methods and their coding methods for approx...

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Problems solved by technology

[0002] Different from the current wireless communication physical layer transmission mechanism, due to the strict requirements on the delay, the main feature of the Ultra Reliable Low Latency Communications (URLLC) system is the transmission of short data packets, which will affect the current Theoretical analysis methods of physical layer signal transmission and the design of coding and modulation schemes pose the following two main challenges: (1) Traditional research and analysis of long data packet (long code, long frame, etc.) transmission performance measurement based on channel capacity or channel outage probability criteria method and its coding approach to channel capacity or achievable channel capacity are no longer applicable

(2) The system time diversity will be severely limited during the transmission of short data packets, and the technology of improving system time diversity gain based on interleaving and hybrid automatic retransmission in the traditional long packet transmission process will be greatly limited

However, in the process of short data packet transmission, the use of training sequences will greatly reduce the spectral efficiency of the system due to the size of the control data and information data being equal; on the other hand, in the process of short data packet transmission, due to the limited number of occupied channels, The accuracy of the channel state information estimated based on the training sequence will be seriously affected

Therefore, the effective acquisition of instantaneous CSI is widely considered to be the technical bottleneck restricting the realization of URLLC in large-scale SIMO systems.

At present, although blind signal processing and differential modulation methods for multi-antenna systems can solve the problem of CSI acquisition, blind signal processing methods often need to use a longer sampling window to obtain, so they cannot meet the delay requirements of short data packets. Require

Although the differential modulation scheme can simplify the channel estimation operation in the coherent mechanism, it will have a 3 decibel error performance loss compared with the coherent mechanism, and cannot ensure the reliability of short packet transmission

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