Results 151 to 160 of about 5,452 (173)

Multicarrier joint detection CDMA mobile communications

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 2002
One of the main requirements of a future mobile radio system is a flexible and adaptable radio interface to provide dynamically changing bit rates and a variety of services in various radio environments. Hybrid frequency and time divided code division multiple access (F/T/CDMA) represents a viable basis for the radio interface of future mobile ...
F. Berens, P. Jung, J. Plechinger, P.W. Baier   +3 more
openaire   +1 more source

Multicarrier CDMA for cellular overlay systems

IEEE Journal on Selected Areas in Communications, 1999
A code-division multiple access (CDMA) cellular overlay system is investigated, employing the idea of multicarrier CDMA, which has previously received significant attention as an alternative to traditional single-carrier CDMA. Overlay is pursued here as a means of long-term transition from narrowband cellular to CDMA cellular.
B.J. Rainbolt, S.L. Miller
openaire   +1 more source

LMSE-Based Parameter Acquisition for Multicarrier CDMA Systems

MILCOM 2007 - IEEE Military Communications Conference, 2007
A least mean-squared error (LMSE) based scheme for acquiring the symbol timing, carrier phases, and resolvable path gains is proposed for multicarrier code-division multiple-access (MC-CDMA) systems. A new coefficient called the quasi-mean-squared accuracy coefficient (QM-SAC) is introduced.
null Shun-Te Tseng, J.S. Lehnert
openaire   +1 more source

Multicarrier CDMA systems using PCC-OFDM

VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026), 2002
Polynomial cancellation coded orthogonal frequency division multiplexing (PCC-OFDM) with overlapping symbol periods is a modulation scheme with properties that make it well suited to high speed data transmission including mobile applications. PCC-OFDM is much less sensitive to frequency offset and Doppler spread than ordinary OFDM.
J. Armstrong, C. Tellambura
openaire   +1 more source

Subspace MMSE receiver for multicarrier CDMA

WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466), 2003
We consider subspace-based MMSE multiuser detection for multicarrier code division multiple access (MC-CDMA) in Rayleigh fading channels. The knowledge of the fading coefficients for all the carriers and the timing delay of the desired user is needed to construct the MMSE detector.
J. Namgoong, T.F. Wong, J.S. Lehnert
openaire   +1 more source

Spectral overlay of multicarrier CDMA on existing CDMA mobile systems

IEEE Communications Letters, 1999
A spectral overlay of a narrow-band code division multiple access (CDMA) system and a wide-band multicarrier CDMA system is considered as a means for existing CDMA mobile networks to evolve into a future CDMA network. The achievable joint capacity of the overlaid system is provided and compared with that of another network evolution strategy of ...
null Il Gyu Kim, null Dongwoo Kim
openaire   +1 more source

Comparing DS-CDMA and multicarrier CDMA with imperfect channel estimation

Proceedings of the 11th IEEE Signal Processing Workshop on Statistical Signal Processing (Cat. No.01TH8563), 2002
Probability of bit error expressions are derived for direct sequence CDMA (DS-CDMA) and multicarrier CDMA (MC-CDMA) with imperfect diversity combining. Pilot and data channels are transmitted through a Rayleigh fading channel with an exponential multipath intensity profile. Channel statistics are estimated using simple integrators.
L.L. Chong, L.B. Milstein
openaire   +1 more source

Multicarrier CDMA with cross-system interference cancellation

2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.04TH8733), 2004
In this paper, the performance of a MC-CDMA system with cross-system interference cancellation is evaluated in an overloaded environment. Simulation results predict that a MC-CDMA receiver with cross-system interference cancellation is able to detect and demodulate signals in a Rayleigh fading environment with a loading of two, where a conventional MC ...
K. Karwedsky, D. Mills, M. Kotrlik, J. Weitzen   +3 more
openaire   +1 more source

Performance of multicarrier DS/SFH-CDMA systems

Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324), 2003
In this paper, multicarrier direct-sequence/slow-frequency-hopping (DS/SFH) CDMA systems are proposed, in which multiple carriers are modulated by the same DS waveform and hopped in frequency according to a hopping pattern. It is shown that the multicarrier DS/SFH systems are superior to the multicarrier DS systems in reducing multiple access ...
null Hu Huang, null Jiangzhou Wang
openaire   +1 more source

Performance of an Improved Multicarrier CDMA System

2006 8th international Conference on Signal Processing, 2006
Multicarrier code-division multiple-access (MC-CDMA) is one of the effective techniques to gain its multiple access capability, robustness against fading, and to mitigate the ISI. The conventional MC CDMA system is to transmit identical narrowband direct-sequence (DS) waveform in parallel over a number of subchannels uniformly.
Cuiran Li, Jianli Xie, Chengshu Li
openaire   +1 more source