Method for optimizing short packet frame structure in pilot-assisted communication under continuous fading channel
A fading channel and auxiliary communication technology, which is applied in the directions of pilot signal allocation, transmission path sub-channel allocation, multi-frequency code system, etc., can solve problems such as solving complex transcendental equations, achieve the effect of reducing pilot overhead and improving throughput
Pending Publication Date: 2022-02-18
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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However, the solution of the transcendental equations under continuous fading is very complicated, which has not been studied in the previous literature
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0041] The invention is based on a URLLC system using short packets. figure 1 The structure of a block in the system is illustrated. A block transmits L-bit information with N symbols of M-order modulation, which includes three parts: pilot frequency, error correction code (ECC) redundancy, and information. Pilot symbols are used for channel estimation, and the pilot length is n t , the pilot overhead ratio is α=n t / N. The information part places the modulated information, the length is L / log 2 (M) symbol. Different types of ECC will achieve different coding gains, and the present invention does not limit the selection of ECC.
[0042] When encountering continuous fading, the best pilot pattern is Regular Periodic Placement (RPP)-1, as in figure 1 shown. The RPP-1 scheme is to insert a pilot symbol regularly every αN-1 data symbols under...
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The invention provides a method for optimizing a short packet frame structure in pilot frequency auxiliary communication under a continuous fading channel. In the low to medium SNR or continuous fading, the pilot frequency overhead can be reduced and the throughput capacity can be remarkably improved by improving the pilot frequency power, and under the high SNR, the pilot frequency overhead plays a leading role in improving the throughput capacity, and meanwhile, a relatively low peak-to-average power ratio is kept. For the expression of throughput, a closed expression of a progressive block error probability under continuous fading is obtained, and the closed expression is related to pilot frequency power, pilot frequency length and block length. For throughput maximization, approximate optimal pilot frequency power and approximate optimal block length are given in a closed form by solving a complex transcendental equation. Compared with exhaustive search, the joint pilot frequency power, pilot frequency length and block length optimization (JPLLO) algorithm provided by the invention has the advantages that the approximate optimal performance is realized, the complexity is greatly reduced, and convergence is only carried out in 1-3 iterations. The JPLLO algorithm is obviously superior to the previous joint optimization algorithm under the condition of continuous fading.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a method for optimizing the short packet frame structure in pilot-aided communication under continuous fading channels. Background technique [0002] Ultra-reliable and low-latency communications (URLLC) is one of the major use cases for fifth-generation (5G) wireless communications to enable various mission-critical applications such as Industrial Internet of Things (IIoT), Vehicle-to-Everything (V2X) and Smart Grid. [0003] Short packet transmission is an effective solution for low latency. However, the classic Shannon's theorem does not apply to finite block length (FBL) regimes with non-negligible block error probability (BLEP). In Non-Patent Document 1 (Y.Polyanskiy, H.V.Poor, and S.Verdu, "Channel coding rate in the finite blocklength regime," IEEE Transactions on Information Theory, vol.56, No.5, pp.2307–2359, 2010. ) in Polyanskiy revealed the relationsh...
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Login to View More IPC IPC(8): H04L25/02H04L5/00H04L27/26
CPCH04L25/0224H04L25/0226H04L5/0048H04L27/261H04L27/262Y02D30/70
Inventor 刘夏越朱旭蒋宇飞曹杰
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL