Successive Gaussian Approximation Based BP Detection for New Radio Multiple Access

2019 ◽  
Author(s):  
I-Hsuan Liao ◽  
Jen-Ming Wu
Keyword(s):  
Multiple Access ◽  
Gaussian Approximation ◽  
New Radio

5G New Radio: Waveform, Frame Structure, Multiple Access, and Initial Access

2017 ◽  
Vol 55 (6) ◽  
pp. 64-71 ◽  
Author(s):  
Shao-Yu Lien ◽  
Shin-Lin Shieh ◽  
Yenming Huang ◽  
Borching Su ◽  
Yung-Lin Hsu ◽  
...  
Keyword(s):  
Multiple Access ◽  
Frame Structure ◽  
New Radio

scholarly journals Analysis of 5G New Radio Uplink Signals on an Analogue-RoF System Based on DSP-Assisted Channel Aggregation

2018 ◽  
Vol 9 (1) ◽  
pp. 47 ◽  
Author(s):  
Befekadu Mengesha ◽  
Pablo Torres-Ferrera ◽  
Roberto Gaudino
Keyword(s):  
Multiple Access ◽  
Digital Signal ◽  
Efficiency Gain ◽  
Error Vector Magnitude ◽  
Access Technology ◽  
Radio Access Technology ◽  
Performance Requirements ◽  
Radio Access ◽  
New Radio ◽  
Aggregation Techniques

The 3rd Generation Partnership Project (3GPP) is in the process of developing 5th generation (5G) radio access technology, the so-called new radio (NR). The aim is to achieve the performance requirements forIMT-2020 radio interface technology. In this paper, we focus on the analysis of the transmission of 5G NR uplink physical channels, such as physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH), dedicated for data and control channels, respectively, as specified in the 3GPP standard, using digital signal processing (DSP)-assisted frequency division multiple access (FDMA) and time division multiple access (TDMA) channel aggregation techniques on an analogue radio-over-fiber (A-RoF) architecture. We verified that there is ~34% spectral efficiency gain and lower error vector magnitude (EVM) achieved using the TDMA technique.

scholarly journals Design and Analysis of Self-Healing Tree-Based Hybrid Spectral Amplitude Coding OCDMA System

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Waqas A. Imtiaz ◽  
Affaq Qamar ◽  
Atiq Ur Rehman ◽  
Haider Ali ◽  
Adnan Rashid Chaudhry ◽  
...  
Keyword(s):  
Multiple Access ◽  
Simulation Analysis ◽  
Gaussian Approximation ◽  
Minimum Cost ◽  
Passive Optical Network ◽  
Spectral Amplitude ◽  
Hybrid Architecture ◽  
Self Healing ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

This paper presents an efficient tree-based hybrid spectral amplitude coding optical code division multiple access (SAC-OCDMA) system that is able to provide high capacity transmission along with fault detection and restoration throughout the passive optical network (PON). Enhanced multidiagonal (EMD) code is adapted to elevate system’s performance, which negates multiple access interference and associated phase induced intensity noise through efficient two-matrix structure. Moreover, system connection availability is enhanced through an efficient protection architecture with tree and star-ring topology at the feeder and distribution level, respectively. The proposed hybrid architecture aims to provide seamless transmission of information at minimum cost. Mathematical model based on Gaussian approximation is developed to analyze performance of the proposed setup, followed by simulation analysis for validation. It is observed that the proposed system supports 64 subscribers, operating at the data rates of 2.5 Gbps and above. Moreover, survivability and cost analysis in comparison with existing schemes show that the proposed tree-based hybrid SAC-OCDMA system provides the required redundancy at minimum cost of infrastructure and operation.

Optimization of LDPC Codes by Extrinsic Information Transfer Chart

2013 ◽  
Vol 427-429 ◽  
pp. 1518-1523
Author(s):  
Jing Xi Zhang
Keyword(s):  
Information Transfer ◽  
Multiple Access ◽  
Gaussian Approximation ◽  
Additive White Gaussian Noise ◽  
Ldpc Code ◽  
Multiple Access Channel ◽  
Parity Check ◽  
Extrinsic Information ◽  
Access Channel ◽  
Check Matrix

The optimization of degree profiles of low-density parity-check (LDPC) code in additive white Gaussian noise (AWGN) multiple access channel (MAC) by fitting the transfer characteristics of variable nodes detector (VND) and that of check nodes detector (CND) is discussed. Extrinsic information transfer (EXIT) characteristics are used for determining the degree profiles based on curve fitting. The convergence the optimized LDPC code is ensured by the EXIT characteristics of VND and CND. Degree profiles are obtained and check matrix is constructed. Simulation results show that the method is variable in designing LDPC code degree profiles in MAC with reduced complexity compared with density evolution based on Gaussian approximation.

Sign in / Sign up

Export Citation Format

Share Document