Results 41 to 50 of about 491,261 (311)
Secrecy analysis for orthogonal time frequency space technique based LEO satellite communication
Tongxin xuebao, 2021 In order to improve the security performance of low earth orbit (LEO) satellite downlink communication system, a cooperative UAV was employed to send jamming signals against the eavesdroppers.In particular, the downlink transmission was based on the ...
Zan LI +4 more
doaj +2 more sources
Adaptive spatial mode of space-time and spacefrequency OFDM system over fading channels [PDF]
, 2006 In this paper we present a 2 transmit 1 receive (1 Tx : 1 Rx) adaptive spatial mode (ASM) of space-time (ST) and space-frequency (SF) orthogonal frequency division multiplexing (OFDM). At low signal to noise ratio (SNR) we employ ST-OFDM and switch to
A. Rahman, Tharek +4 more
core +1 more source
A comparison of MIMO-OFDM and MIMO-SCFDE in WLAN environments [PDF]
, 2003 Recent developments in orthogonal frequency division multiplexing (OFDM) and single-carrier frequency-domain equalization (SCFDE) have sparked debate about the superiority of one method over the other.
Armour, SMD +5 more
core +2 more sources
Data-Aided CSI Estimation Using Affine-Precoded Superimposed Pilots in Orthogonal Time Frequency Space Modulated MIMO Systems [PDF]
IEEE Transactions on Communications, 2023 An orthogonal affine-precoded superimposed pilot (AP-SIP)-based architecture is developed for the cyclic prefix (CP)-aided single input single output (SISO) and multiple input multiple output (MIMO) orthogonal time frequency space (OTFS) systems relying ...
Anand Mehrotra +3 more
semanticscholar +1 more source
IET Communications, 2023 This work studies the equalization methods for the reduced zero‐padding version of the orthogonal time frequency space modulation. Here, the focus is on applications in low data rate scenarios such as the Internet of Things, and the case where the number
Yuan Zhang, Peng Du
doaj +1 more source
OFDM based Distributed Space Time Coding for Asynchronous Relay Networks [PDF]
, 2008 Recently Li and Xia have proposed a transmission scheme for wireless relay networks based on the Alamouti space time code and orthogonal frequency division multiplexing to combat the effect of timing errors at the relay nodes. This transmission scheme is
Rajan, B. Sundar, Rajan, G. Susinder
core +3 more sources
IEEE Transactions on Communications, 2022 A sparse channel state information (CSI) estimation model is proposed for reducing the pilot overhead of orthogonal time frequency space (OTFS) modulation aided multiple-input multiple-output (MIMO) systems.
Suraj Srivastava +3 more
semanticscholar +1 more source
Space-Time Multiple-Mode Orthogonal Frequency Division Multiplexing With Index Modulation
IEEE Access, 2017 Multiple-mode orthogonal frequency division multiplexing with index modulation (MM-OFDM-IM) improves the spectral efficiency of the conventional OFDM-IM scheme by considering multiple distinguishable constellations for signal modulation.
Jun Li +3 more
doaj +1 more source
Orthogonal Time Frequency Space (OTFS) Modulation for Wireless Communications
CoRR, 2022 Orthogonal time frequency space (OTFS) modulation is a recently proposed multi-carrier transmission scheme, which innovatively multiplexes the information symbols in the delay-Doppler (DD) domain instead of the conventional time-frequency (TF) domain. The DD domain symbol multiplexing gives rise to a direct interaction between the DD domain information
openaire +2 more sources
Orthogonal Time Frequency Space (OTFS) Modulation Based Radar System [PDF]
International Radar Conference, 2019 Orthogonal time frequency space (OTFS) modulation was proposed to tackle the destructive Doppler effects in wireless communications, with potential applications to many other areas.
P. Raviteja +3 more
semanticscholar +1 more source