Results 31 to 40 of about 2,794,451 (217)
Investigation of Blanking Nonlinearity in OFDM Systems [PDF]
, 2011 In this paper, we analyze the influence of a blanking nonlinearity onto OFDM systems in detail. We will derive closedform expressions for the signal degradation and the interference, which is introduced by the blanking nonlinearity.
Michael Schnell +5 more
core +1 more source
Achieving Transmit Diversity in OFDM-IM by Utilizing Multiple Signal Constellations
IEEE Access, 2017 Orthogonal frequency division multiplexing (OFDM) index modulation (IM) is a novel multicarrier modulation, which employs both the indices of the active subcarriers and conventional constellation symbols to convey information.
Jianping Zheng, Ru Chen
doaj +1 more source
Optimal Mapper for OFDM With Index Modulation: A Spectro-Computational Analysis
IEEE Access, 2020 In this work, we present an optimal mapper for OFDM with index modulation (OFDM-IM). By optimal we mean the mapper achieves the lowest possible asymptotic computational complexity (CC) when the spectral efficiency (SE) gain over OFDM maximizes.
Saulo Queiroz +2 more
doaj +1 more source
A Novel Error Performance Analysis Methodology for OFDM-IM [PDF]
IEEE Wireless Communications Letters, 2019 An accepted letter by IEEE Wireless Communications ...
Shuping Dang +3 more
openaire +4 more sources
New Design of Constellation and Bit Mapping for Dual Mode OFDM-IM
IEEE Access, 2019 Dual mode orthogonal frequency division multiplexing with index modulation (DM-OFDM-IM) is recently proposed, where the subcarriers within each subblock are divided into two groups, which are modulated by two distinguishable signal constellations.
Kee-Hoon Kim, Hosung Park
doaj +1 more source
Overview on PAPR reduction techniques in OFDM-IM
Multidiszciplináris tudományok, 2022 This paper is concerned with the novel multicarrier transmission technique, Orthogonal Frequency Division Multiplexing (OFDM) based on Index Modulation (IM), which acts as an alternative for conventional OFDM. The system generally shows improvements over conventional OFDM in achieving lower bit error rate, higher spectral efficiency, and better energy ...
Bana Hassan Shekh Faraj +1 more
openaire +1 more source
Advanced Channel Estimation for MIMO-OFDM in Realistic Channel Conditions
, 2007 An advanced decision-directed channel estimation scheme is proposed, which is suitable for employment in a wide range of multi-antenna multi-carrier systems as well as for communications over the entire range of practical channel conditions.
Akhtman, J. +3 more
core +2 more sources
IEEE AccessIn this paper, we first propose a novel code rate optimized orthogonal frequency division multiplexing with index modulation (OFDM-IM) transceiver architecture based on new radio low-density parity-check (NR-LDPC) coding, referred to as Rate Optimization
Zijian Zeng, Huan Ma, Liang Lv
doaj +1 more source
Synchronization technics for OFDM systems [PDF]
, 2006 [ENGLISH] The thesis deals with the problem of synchronization in Orthogonal Frequency Division Multiplexing (OFDM) systems. This modulation technique has been in existence since 1960, however, in the last years OFDM modulation is emerged as a key ...
Fusco, Tilde
core +1 more source
Multi‐Dimensional Physical‐Layer Security via Digitally Mediated Space–Time Modulation
Advanced Science, EarlyView.Digitally mediated space–time modulation moves radiation control beyond hardware‐bound switching. Multiple information‐bearing and masking waveforms are jointly synthesized at baseband and coherently coupled to simple periodic time modulation, enabling programmable, independently directed multi‐beam radiation without increasing switching‐state ...
Kejin Chen +8 more
wiley +1 more source