Results 81 to 90 of about 23,563 (255)
A comparison of CDMA techniques for third generation mobile radio systems [PDF]
, 1993 A comparison is made between both direct sequence (DS) and frequency hopping (FH) spreading techniques in code division multiple access (CDMA) based upon the stringent requirements of proposed third generation mobile radio systems in Europe.
Beach, MA +4 more
core +2 more sources
IET Radar, Sonar &Navigation, Volume 18, Issue 9, Page 1474-1480, September 2024.The spatial sensitivity of a machine‐learning‐based coding digital receiving array (ML‐CDRA) is studied which describes the spatial accumulation gain in different directions. It is demonstrated that spatial sensitivity is determined by the encoding network, decoding network, and beamforming criterion.
Lei Xiao, Yubing Han, Shurui Zhang
wiley +1 more source
International Journal of Antennas and Propagation, 2011 We analytically derive the upper bound for the bit error rate (BER) performance of a single user multiple input multiple output code division multiple access (MIMO-CDMA) system employing parity-bit-selected spreading in slowly varying, flat Rayleigh ...
Claude D'Amours, Adel Omar Dahmane
doaj +1 more source
Near-far resistant CML propagation delay estimation and multi-user detection for asynchronous DS-CDMA systems [PDF]
, 1999 Multi-user receivers in asynchronous direct sequence code division multiple access (DS-CDMA) systems require the knowledge of several parameters such as timing delay between users. The goal of this work is to present a near-far resistant joint multi-user
Rey Micolau, Francesc +2 more
core +1 more source
Data collection in IoT networks: Architecture, solutions, protocols and challenges
IET Wireless Sensor Systems, Volume 14, Issue 4, Page 85-110, August 2024.Current IoT data collection techniques are categorised and a comparative evaluation of these methods is performed based on the topics analysed and elaborated by the authors. In addition, a comprehensive analysis of recent advances in IoT data collection is provided, highlighting different data types and sources, transmission protocols from connected ...
Ado Adamou Abba Ari +6 more
wiley +1 more source
Theoretical Investigation into Spectral Coexistence of CDMA and TDMA Systems
The Journal of Engineering Research, 2008 The scarcity of available radio spectrum presently limits the extension of modern multimedia systems. This paper presents a theoretical investigation into the possibility of using a frequency overlay of a narrowband Code Division Multiple Access (CDMA ...
A.M. Abbosh, M. A. Shehathah
doaj +1 more source
Sequence optimisation for compressed sensing CDMA MIMO radar via mutual coherence minimisation
IET Radar, Sonar &Navigation, Volume 18, Issue 7, Page 1178-1192, July 2024.The authors focus on optimising waveforms for CDMA‐MIMO radar systems, particularly for Compressed Sensing (CS) based target estimation. The study introduces an optimisation framework to modify phase components of code sequences, aiming to minimise off‐diagonal elements in the Gramian matrix of the sensing matrix.
Saravanan Nagesh +4 more
wiley +1 more source
, 2005 —In multicarrier code-division multiple-access (MCCDMA), the total system bandwidth is divided into a number of subbands, where each subband may use direct-sequence (DS) spreading and each subband signal is transmitted using a subcarrier frequency.
Hanzo, L., Yang, L-L.
core
Finite-step algorithms for constructing optimal CDMA signature sequences [PDF]
, 2003 A description of optimal sequences for direct-spread code-division multiple access (DS-CDMA) is a byproduct of recent characterizations of the sum capacity.
Dhillon, Inderjit S. +2 more
core +2 more sources
, 2010 The so-called receiver multiuser diversity aided multistage minimum mean-square error multiuser detector (RMD/MS-MMSE MUD), which was proposed previously by the author, is investigated in the context of the direct-sequence code-division multiple-access ...
Yang, Lie-Liang
core +1 more source