Study on Joint Detection and Decoding Algorithm Based on 5G NR Specification

Autor: Kai-Liang Lin, 林凱亮
Rok vydání: 2019
Druh dokumentu: 學位論文 ; thesis
Popis: 107
The fifth generation mobile network (5G), also known as New Radio (NR), is expected to be commercialized in 2020. The 5G NR operates including the sub-6GHz frequency bands and millimeter wave bands. In the non-standalone mode, the millimeter wave bands are operated with the aided by sub-6GHz bands. In the standalone mode, the sub-6GHz and the millimeter wave bands can be operated independently. Time Division Duplexing (TDD) mode is usually adopted in the standalone mode. Effectively operating the communications between base station and the user equipment in the TDD mode is a challenging issue. In order to measure the channel environments of different transmissions over the air, we developed a multi-input multi-output (MIMO) measurement platform for TDD mode. The platform mainly designs signal frame based on 5G NR specification, and we study ways to improve signal demodulation and decoding performance under limited bandwidth conditions, and pursue higher signal quality. We design a joint detection and decoding (JDD) algorithm in this thesis. The transmitted waveform adopts low-density parity check (LDPC) encoding based on 5G NR specification. At the receiver, the LDPC decoder feeds the output information bits back to the detector. JDD can sacrifice the cost of computational complexity for the reliability of information bits. JDD algorithm compare to the case without joint decoding, the effective signal noise ratio (ESNR) can be improved at least 3.29 dB. In order to further increase the efficiency of execution, LDPC decoder and detector use the architecture of single instruction multiple data (SIMD), which can increase online throughput. In this thesis, we design and simulate the JDD algorithm via channel, it can reduce systematic bit error rate. The JDD algorithm is also included into the TDD MIMO measurement platform. Through the over the air testing, we demonstrate that the JDD can reduce bit error rate, and can increase system throughput. Keywords: 5G NR, Joint Detection and Decoding, LDPC, MIMO, TDD.
Databáze: Networked Digital Library of Theses & Dissertations
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