Results 21 to 30 of about 4,433,394 (276)
Frequency hopped CDMA for third generation mobile radio systems [PDF]
, 1993 Third generation mobile radio systems will provide unified mobile access to a wide range of services for the mass user market. Code division multiple access (CDMA) is one of the most viable access techniques to provide the flexible air interface required.
Purle, DJ +3 more
core +1 more source
Noncoherent Multi-Way Relay Based on Fast Frequency-Hopping M-ary Frequency-Shift Keying [PDF]
, 2010 Information exchange among a group of users is implemented with the aid of fast frequency-hopping $M$-ary frequency-shift keying multi-way relay (FFH/MFSK MWR). The FFH/MFSK MWR scheme uses two time-slots per symbol for achieving the information exchange,
Cao, Jianfei +2 more
core +2 more sources
Sensors, 2014 Indoor localization of persons and objects poses a great engineering challenge. Previously developed localization systems demonstrate the use of wideband techniques in ultrasound ranging systems.
Laurent Segers +3 more
doaj +1 more source
Probability of intercepting frequency hoping signals using modern search receivers
Vojnotehnički Glasnik, 2001 This article is intended to present the latest scientific findings about the interception of frequency hoping signals. The probability of intercepting frequency hopping signals by means of modern search receivers or scanning direction finders is ...
Slađan M. Svrzić +1 more
doaj +1 more source
Optimum Combining for Coherent FFH/DS Spread Spectrum Receivers in the Presence of Multi-Tone Jammer
IEEE Access, 2020 Fast Frequency Hopping/Direct Sequence (FFH/DS) hybrid spread spectrum is an effective technique of the communication network for the robot swarms operating in complex electromagnetic environment.
Shixun Luo +5 more
doaj +1 more source
Construction of Optimal Sets of Frequency Hopping Sequences [PDF]
ISRN Combinatorics, 2013 Frequency hopping spread spectrum and direct sequence spread spectrum are two main spread coding technologies. Frequency hopping sequences are needed in FH-CDMA systems. In this paper, a construction of optimal sets of frequency hopping sequences is presented.
openaire +2 more sources
IEEE AccessFrequency-hopping technology has been used widely in wireless communications, especially in military communications and in civil mobile communications.
Chun Xie, Changyuan Wang
doaj +1 more source
IEEE Access, 2019 Robust estimation of frequency hopping radar signal parameters is the key to achieving stable jam in frequency hopping communication. In order to deal with the poor noise resistance performance of conventional time-frequency analysis based parameter ...
Song Wei +5 more
doaj +1 more source
Area spectral efficiency of soft-decision space–time–frequency shift-keying-aided slow-frequency-hopping multiple access [PDF]
, 2012 Slow-frequency-hopping multiple access (SFHMA) can provide inherent frequency diversity and beneficially randomize the effects of cochannel interference.
Ngo, Hoang Anh +3 more
core +1 more source
, 2009 — In this contribution reduced-rank adaptive minimum mean-square error multiuser detector (MMSE-MUD) is proposed and investi-gated for the hybrid direct-sequence time-hopping ultrawide bandwidth (DS-TH UWB) systems.
Ahmed, Qasim +3 more
core +2 more sources