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Performance evaluation of 5G New Radio low-density parity check codes over different scenarios of lognormal fading channel

Ali Mohammed Hussein, Al-Rubaye Ghanim A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2024

Vol. 72, nr 5

art. no. e150808

Low-density parity check (LDPC) is a channel coding technique widely utilized in the 5G New Radio standard, it is of utmost importance in facilitating proficient and secure communication in noisy environments by effectively minimizing errors during data transmission. It is primarily used in the 5G New Radio (NR) standard for encoding user information on the physical downlink shared channel (PDSCH). The necessity to satisfy the increasing expectations for throughput, latency, and dependability led to the decision to deploy LDPC codes for user data, especially in the enhanced mobile broadband (eMBB) and ultra-reliable and low-latency communications (URLLC) scenarios of 5G networks. The present system proposes the use of NR-LDPC codes to transmit data across a lognormal multipath fading channel model in the presence of AWGN. Wireless communication channels often use a lognormal multipath fading channel model, where the received signal experiences both multipath fading and lognormal shadowing. The research investigates the effectiveness of NR-LDPC coding in improving QAM-OFDM system performance by analyzing two rate-compatible base graphs and comparing their effectiveness with an uncoded system. This analysis is crucial for optimizing communication network design, especially in scenarios where the integrity of data is of utmost importance. We introduce a new method to improve the 5G NR LDPC code capability under lognormal fading conditions. This approach develops a layered min-sum (LMS) algorithm to provide enhanced error-correcting capabilities. The developed and implemented decoding algorithm represents a significant advancement over traditional detection methods. The outcomes of the simulation provide evidence of the effectiveness of the proposed NR-LDPC coding techniques in terms of their error correction and identification capabilities. In addition, the developed LMS decoding algorithm was shown to significantly decrease the BER of the system.

Throughput physical layer analysis of LTE

Reznikov M., Olszewski S., Al-Shuraifi Talib M., Al-Zayadi H., Komada P.

Elektronika : konstrukcje, technologie, zastosowania

2013

Vol. 54, nr 8

63-66

Technologia Long Term Evolution (LTE) Wyd. 8 zapewnia wysoką szybkość transmisji danych szczytowych na poziomie 300 Mbps w dół strumienia (ang. Downlink) i 75 Mbps w górę strumienia (ang. Uplink) dla częstotliwości 20 MHz. Artykuł dotyczy badania, maksymalnej przepustowości łącza w dół oraz w górę strumienia, w zależności od scenariusza względem warstwy fizycznej. W pracy, obliczenia przepustowości zostały przeprowadzone wyłącznie kanałów danych PUSCH (Physical Kanał Share Uplink) i PDSCH (Physical Downlink Share Channel) z uwzględnieniem metody dostępu zarówno częstotliwościowej FDD (Frequency Division Duplex), jak i czasowej TDD (Time Division Duplex). Analiza przepustowości, różnych elementów zasobów, przypisanych do odpowiednich kanałów danych: downlink i uplink została przeprowadzonoa dla FDD i TDD przy różnych warunkach. Przy czym elementy w dół strumienia (downlink), w ramach FDD zostały obliczone dla wszystkich możliwych pasm systemowych (1,4 MHz do 20 MHz) oraz portów anteny. W artykule zamieszczono rezultaty przeprowadzonej analizy warstwy fizycznej technologii LTE.

Long Term Evolution (LTE) Release 8 provides high peak data rates of 300 Mbps on the downlink and 75 Mbps on uplink for 20 MHz bandwidth. In this study, the maximum throughput of downlink and uplink transmission is investigated depending on scenario for the physical layer. In this paper the throughput calculation exclusively contains data channels (Physical Uplink Share Channel (PUSCH) and Physical Downlink Share Channel (PDSCH)) for both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) operations. For throughput analysis, different resource elements that are assigned for data channels of downlink and uplink are calculated for FDD and TDD operations in different conditions. FDD downlink resource elements are calculated for all the possible system bandwidths (1.4 MHz to 20 MHz) and antenna ports. These results of throughput physical layer analysis of LTE are presented in this paper.