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Diversity Gain for CDMA Systems Equipped With Antenna Arrays
White Paper In order to achieve the diversity gain, this paper proposes a beamforming method that utilizes two beamforming weight vectors and applies this beamforming technique to Code-Division Multiple-Access (CDMA) systems equipped with antenna arrays under... [21 Feb 2006]
Tradeoff Between Source Coding and Spreading in a Multicarrier DS-CDMA System Operating Over Multipath Fading Channels With Narrow-Band Interference
White Paper For a fixed total bandwidth expansion factor, and for a fixed channel code rate, the authors' consider the problem of optimal bandwidth allocation between the source coder and the spread-spectrum unit for a multicarrier direct-sequence CDMA system... [14 Feb 2006]
The Impact of Frequency-Flat Fading on the Spectral Efficiency of CDMA
White Paper The capacity of the randomly spread synchronous Code-Division Multiple-Access (CDMA) channel subject to frequency- flat fading is studied in the wide-band limit of large number of users. This paper finds the spectral efficiency as a function of the... [12 Jan 2006]
Spectral Efficiency of MC-CDMA: Linear and Non-Linear Receivers
White Paper This paper analyzes the spectral efficiency (total channel capacity per subband) of randomly-spread synchronous MultiCarrier Code-Division Multiple-Access (MC-CDMA) channel subject to frequency-selective fading in the asymptotic regime of number... [12 Jan 2006]
Data-Aided Timing Offset Estimation for Frequency Selective Fading Channels
White Paper A novel algorithm for Timing offset estimation is proposed in this paper for GSM and GPRS handsets, especially for multi-path channels with large delay-spread. The timing offset leads to errors in the channel response estimation with a consequent... [21 Nov 2005]
Increase in Co-Located Simultaneous Transmissions for CDMA Ad Hoc Networks
White Paper This paper shows that this trade off favors CDMA as the density of the network increases both for AWGN and fading channel. The improvement in capacity normalized are quantified by the cost in bandwidth expansion for a spread spectrum ad hoc network... [13 Oct 2005]
Spectral Efficiency of Multicarrier CDMA
White Paper This paper analyzes the spectral efficiency (sum-rate per sub-carrier) of randomly spread synchronous multi-carrier code-division multiple access (MC-CDMA) subject to frequency-selective fading in the asymptotic regime of number of users and... [26 Jul 2005]
Randomly Spread CDMA: Asymptotics Via Statistical Physics
White Paper Arbitrary input distributions and flat fading are considered. This paper studies randomly spread code-division multiple access (CDMA) and multiuser detection in the large-system limit using the replica method developed in statistical physics. [26 Jul 2005]
System Capacity of Wideband OFDM Communications Over Fading Channels Without Channel Knowledge
Assuming PSK modulation, this paper derives the system capacity of pulse-shaped orthogonal frequency division multiplexing (OFDM) communications over time-frequency selective fading channels in the absence of channel state information at the... [28 Mar 2005]
System Capacity of Wideband OFDM Communications Over Fading Channels Without Channel Knowledge
White Paper Assuming PSK modulation, this paper derives the system capacity of pulse-shaped orthogonal frequency division multiplexing (OFDM) communications over time-frequency selective fading channels in the absence of channel state information at the... [28 Mar 2005]
Performance Analysis of Multiple-Symbol Differential Detection for OFDM Over Both Time and Frequency-Selective Rayleigh Fading Channels
White Paper In this paper, the performance of orthogonal frequency-division multiplexing (OFDM) system with multiple-symbol differential detection (MSDD) is analyzed over both time and frequency-selective Rayleigh fading channels. [01 Nov 2004]
On the Capacity of OFDM-Based Spatial Multiplexing Systems
White Paper Introducing a physically motivated multiple-input multiple-output (MIMO) broad-band fading channel model, we study the influence of physical parameters such as the amount of delay spread, cluster angle spread, and total angle spread, and system... [21 Oct 2004]
Accurate DS-CDMA Bit-Error Probability Calculation in Rayleigh Fading
White Paper In this white paper a binary direct-sequence spread-spectrum multiple access system with random sequences in flat Rayleigh fading is considered. A new explicit closed-form expression is obtained for the characteristic function of the multiple... [01 Mar 2004]
Does the internet have 24 hours to live?
News The threat seems to be fading out," said Peacock. The CERT labs at Carnegie Mellon University claim the spread has the potential to "disrupt business and personal use of the internet for applications such as ecommerce, email and entertainment". [30 Jul 2001]
