Short data packet ultra-reliable low-delay transmission method enabled by large-scale single-input multiple-output system

Abstract

The invention provides a short data packet ultra-reliable low-delay transmission method enabled by a large-scale single-input multiple-output system. The method comprises the following steps: 1, constructing a short data packet physical layer incoherent transmission scheme with low signal processing delay; 2, obtaining instantaneous variance information of Gaussian white noise of a receiving end;3, determining a finite character constellation optimization problem of an adaptive link signal-to-noise ratio by utilizing noise variance information under the constraint of a signal modulation orderand average power; 4, converting an optimization problem into a constellation structure design and bit allocation problem in a multi-dimensional parameter space; 5, determining an optimal constellation structure and a bit allocation scheme of each parameter space for different modulation orders based on the conversion problem; and 6, under the requirements of bit error rate and transmission rate,solving the problem of optimal configuration of the number of antennas at the receiving end. Channel estimation operation can be avoided under a quick-change channel, spatial diversity and time coding gain are fully utilized, and ultra-reliable low-delay transmission of short data packets is realized.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a short data packet ultra-reliable and low-delay transmission method enabled by a large-scale single-input multiple-output system. Background technique [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 lo...

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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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