multi-user CDMA systems
Exploring the reconfigurability options of multi carrier CDMA in cognitive radio systems
... a multi-carrier system and an IFFT block is added to provide the multi-carrier ...one user needs to be supported on a fairly good channel, it can avoid the coding and decoding complexity and ...
5
Design of Space-Time Coded Single-Carrier and Multi-Carrier MIMO-CDMA systems
... communication systems, in these systems multiple access interference mitigation at the receiver via multi-user beam forming and space-time modulation and coding for MIMO systems ...in ...
5
Download complete issue: Vol. 2, No. 1 (PDF)
... CDMA systems have some disadvantages such as inter- symbol interference (ISI) and inter-chip inteference (ICI) ...multicarrier CDMA scheme (MC-CDMA) is one approach used to overcome those ...
6
Non Iterative Algorithm for Multi user Detection in DS CDMA System: An Enhanced Harmony Search Algorithm
... demodulating CDMA signals and is also known as the conventional ...for multi-user detection of CDMA signals, the performance of two layer preceptor neural network using BP learning rule has ...
7
ADAPTIVE CODE TO USER ALLOCATION FOR INTERFERENCE MANAGEMENT ON THE DOWNLINK DS-CDMA SYSTEMS
... diagram in Fig.4. 1. Assuming Nc = K, at each symbol period and using the instantaneous values of Xi, the decision variables’ distribution for each of the pc allocation patterns is evaluated and the optimal pattern is ...
11
PAPR reduction in SFBC MIMO MC-CDMA systems via user reservation
... these, multi-carrier CDMA (MC-CDMA), also known as orthogonal frequency division multiplexing CDMA (OFDM-CDMA), offers several key advantages such as immunity against narrowband ...
10
Compressive Sensing Multi User Detection for MC CDMA System in Machine to Machine Communication
... wireless systems also have to meet different new communication requirements in some M2M applications such as low latency for smart meters and highly reliable communication for medical devices ...
6
Single and Multi Carrier DS CDMA: Multi USer Detection, Space Time Spreading, Synchronisation, Standards and Networking
... Third-Generation Systems and Intelligent Wireless Networking: Smart Antennas and Adaptive Modulation, John Wiley - IEEE Press, 2002, p408 ...TDMA, CDMA and OFDM systems, John Wiley - IEEE Press, ...
56
Single and Multi Carrier DS CDMA: Multi USer Detection, Space Time Spreading, Synchronisation, Standards and Networking
... wireless systems, the concept of ART might also be extended to adaptively controlling the multiple access schemes - in- cluding FDMA, TDMA, narrow-band CDMA, W-CDMA and OFDM - as well as the sup- ...
278
Multi User Detection by MMSE Adaptive Algorithm for Multi Beam MIMO MC CDMA using Sequences of References
... the multi-antenna technology is improving the capacity of cellular ...used Multi-Beamformer with sequences of references at receiver and space time block code (STBC) or vertical bell labs space-time ...
7
Adaptive Modulation and Adaptive Antenna Array Assisted Network Performance of Multi User Detection Aided UTRA like FDD/CDMA Systems
... was used for identifying the desired user, and the remaining interfer- ing users were assigned the other seven 8-bit reference signals. The received signal’s autocorrelation matrix was then calculated, and from ...
5
A resource allocation approach to control interference in Multi Carrier DS CDMA systems
... the user for rate is given in (17) and additionally it should satisfy constraints specified in (11)(12) once it is allocated to the user and then , is to be updated ...
8
Distributed probabilistic data association detector with turbo base station cooperations in multi user multi cell MIMO systems
... To obtain the soft information through local detection, many low-complexity algorithms have been investigated as alternative designs for optimal maximum a posteriori probability (MAP) solution. Among them, probabilistic ...
10
Performance Analysis of Multi User Detectors for Synchronous DS CDMA Systems
... each user is assigned a unique spreading code or hopping pattern, which is used to modulate their data ...single-user systems is spectrally inefficient, as it uses more bandwidth than the minimum ...
10
Analysis The Effect Of Diversity Technique On A Multi-user Wideband Cdma (w-cdma) Communication System
... IS-95 CDMA system ...95 CDMA standard specifies ...supports CDMA over wider bandwidths for capacity improvement and higher data rates, will maintain backward compatibility with existing IS-95 ...
7
Multi user MIMO CDMA systems using complete complementary sequences
... MIMO systems depending on a number of phenomena, including received power, noise, and co-channel ...the multi-dimensional statistical behaviour of the MIMO fading channel is most significant to the system ...
8
An Efficient Homomorphic Encryption Protocol for Multi-User Systems
... each user hold a unique user key + and use a transformation function to transform the ciphertext encrypted by the user key + to the ciphertext encrypted by the master key ...individual user ...
19
Varying the User Interaction within Multi Agent Systems
... The Robotics Institute Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15232 USA.. The Robotics Institute Carnegie Mellon University 5000 Forbes Avenue Pittsburgh, PA 15232 [r] ...
7
Influence of laser diode nonlinearities on fibre optic systems supporting direct-sequence code division multiple access signals
... Following the very great success of mobile cellular networks, based on analogue trans mission, in penetrating the business market there was a clear need to introduce new solutions based on the transmission of digitised ...
182
Extending Order Preserving Encryption for Multi-User Systems
... Abstract. Several order preserving encryption (OPE) algorithms have been developed in the literature to support search on encrypted data. However, existing OPE schemes only consider a single encryption key, which is ...
15