Results 1 - 10 of 7,792

Spectral Efficiency in the Wideband Regime

by Sergio Verdú , 2002
"... The tradeoff of spectral efficiency (b/s/Hz) versus energy -per-information bit is the key measure of channel capacity in the wideband power-limited regime. This paper finds the fundamental bandwidth--power tradeoff of a general class of channels in the wideband regime characterized by low, but nonz ..."
Abstract - Cited by 393 (29 self) - Add to MetaCart
The tradeoff of spectral efficiency (b/s/Hz) versus energy -per-information bit is the key measure of channel capacity in the wideband power-limited regime. This paper finds the fundamental bandwidth--power tradeoff of a general class of channels in the wideband regime characterized by low

Spectral Efficiency of CDMA with Random Spreading

by Sergio Verdú, Shlomo Shamai (Shitz) - IEEE TRANS. INFORM. THEORY , 1999
"... The CDMA channel with randomly and independently chosen spreading sequences accurately models the situation where pseudonoise sequences span many symbol periods. Furthermore, its analysis provides a comparison baseline for CDMA channels with deterministic signature waveforms spanning one symbol per ..."
Abstract - Cited by 313 (23 self) - Add to MetaCart
period. We analyze the spectral efficiency (total capacity per chip) as a function of the number of users, spreading gain, and signal-to-noise ratio, and we quantify the loss in efficiency relative to an optimally chosen set of signature sequences and relative to multiaccess with no spreading. White

Spectral Efficiency

by Saso Tomazic
"... Spectral efficiency is a measure of the performance of channel coding methods. It refers to the ability of a given channel encoding method to utilize bandwidth efficiently. It is defined as the average number of bits per unit of time (bit rate) that can be transmitted per unit of bandwidth (bits per ..."
Abstract - Add to MetaCart
Spectral efficiency is a measure of the performance of channel coding methods. It refers to the ability of a given channel encoding method to utilize bandwidth efficiently. It is defined as the average number of bits per unit of time (bit rate) that can be transmitted per unit of bandwidth (bits

On the Spectral Efficiency of Large CDMA

by Systems Using Higher , 2003
"... The spectral efficiency of large CDMA systems using higher order modulation schemes is investigated. Therefore, the asymptotic analysis for single cell systems and random spreading codes is used to obtain the signal-to-interference-andnoise ratio (SINR) after the Matched Filter (MF) and Linear Minim ..."
Abstract - Add to MetaCart
The spectral efficiency of large CDMA systems using higher order modulation schemes is investigated. Therefore, the asymptotic analysis for single cell systems and random spreading codes is used to obtain the signal-to-interference-andnoise ratio (SINR) after the Matched Filter (MF) and Linear

Spectral Efficiency WDM Systems

by Chidambaram Pavanasam, Kenneth Demarest , 2004
"... The current emphasis on lightwave systems is on increasing the spectral efficiency of WDM systems. One of the techniques that is used for achieving high spectral efficiency in WDM systems is vestigial side band demultiplexing. This thesis reports the modeling and analysis of an experimental 40 Gbit/ ..."
Abstract - Add to MetaCart
The current emphasis on lightwave systems is on increasing the spectral efficiency of WDM systems. One of the techniques that is used for achieving high spectral efficiency in WDM systems is vestigial side band demultiplexing. This thesis reports the modeling and analysis of an experimental 40 Gbit

On the spectral efficiency of a sphere

by M. Gustafsson, S. Nordebo - PIER , 2007
"... Abstract—In many cases it is desired to have both high capacity and small antennas in wireless communication systems. Unfortunately, the antenna performance deteriorates when the antennas get electrically small. In this paper, fundamental limitations from antenna theory and broadband matching are us ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
are used to analyze fundamental limitations on the spectral efficiency of an arbitrary antenna inserted inside a sphere. 1.

Spectral efficiency of multicarrier CDMA

by Antonia M. Tulino, Linbo Li, Sergio Verdú - IEEE Trans. Inf. Theory , 2005
"... Abstract—We analyze the spectral efficiency (sum-rate per subcarrier) of randomly spread synchronous multicarrier code-division multiple access (MC-CDMA) subject to frequency-selective fading in the asymptotic regime of number of users and bandwidth going to infinity with a constant ratio. Both upli ..."
Abstract - Cited by 16 (1 self) - Add to MetaCart
Abstract—We analyze the spectral efficiency (sum-rate per subcarrier) of randomly spread synchronous multicarrier code-division multiple access (MC-CDMA) subject to frequency-selective fading in the asymptotic regime of number of users and bandwidth going to infinity with a constant ratio. Both

Spectrally-Efficient Continuous Phase Modulations

by Alan Barbieri, Dario Fertonani, Student Member, Giulio Colavolpe - IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS , 2009
"... Abstract—We investigate the spectral efficiency of continuous phase modulations (CPMs). To this end, we need an effective bandwidth definition for a CPM signal, whose power spectral density has in principle an infinite support. The definition we adopt is based on the spacing between adjacent carrier ..."
Abstract - Cited by 12 (7 self) - Add to MetaCart
Abstract—We investigate the spectral efficiency of continuous phase modulations (CPMs). To this end, we need an effective bandwidth definition for a CPM signal, whose power spectral density has in principle an infinite support. The definition we adopt is based on the spacing between adjacent

Laplacian eigenmaps and spectral techniques for embedding and clustering.

by Mikhail Belkin , Partha Niyogi - Proceeding of Neural Information Processing Systems, , 2001
"... Abstract Drawing on the correspondence between the graph Laplacian, the Laplace-Beltrami op erator on a manifold , and the connections to the heat equation , we propose a geometrically motivated algorithm for constructing a representation for data sampled from a low dimensional manifold embedded in ..."
Abstract - Cited by 668 (7 self) - Add to MetaCart
in a higher dimensional space. The algorithm provides a computationally efficient approach to nonlinear dimensionality reduction that has locality preserving properties and a natural connection to clustering. Several applications are considered. In many areas of artificial intelligence, information

Comments on Spectral Efficiency of VMSK

by Saso Tomazic , 2002
"... This paper demonstrates that no ultra narrow band modulation method, which includes VMSK and VPSK, can have substantially greater efficiency than conventional methods, such as QAM, in transmission in the same frequency band. ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
This paper demonstrates that no ultra narrow band modulation method, which includes VMSK and VPSK, can have substantially greater efficiency than conventional methods, such as QAM, in transmission in the same frequency band.
Results 1 - 10 of 7,792