multiple systems fading
Wavelet-Based Separating Kernels for Array Processing of Cellular DS/CDMA Signals in Fast Fading
White Paper Multi-path compensation in CDMA systems is a problem of significant complexity especially when rapidly fading is afflicting the radio frequency channel. We propose new detectors for direct-sequence code-division multiple-access (CDMA) signals that... [03 Jul 2008]
Performance of MIMO OFDM Systems in Fading Channels With Additive TX and RX Impairments
White Paper To gain a better understanding of the influence of these impairments on the performance of multiple antenna OFDM systems, this paper studies a zero-forcing based MIMO OFDM system with imperfections modeled as additive error sources in both... [10 Apr 2008]
Implementation of a MIMO OFDM Based Wireless LAN System
White Paper The combination of Multiple-Input Multiple-Output (MIMO) signal processing with Orthogonal Frequency Division Multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next generation wireless communication systems... [10 Apr 2008]
Implementation of a MIMO OFDM-Based Wireless LAN System
White Paper The combination of multiple-input multiple-output (MIMO) signal processing with orthogonal frequency division multiplexing (OFDM) is regarded as a promising solution for enhancing the data rates of next-generation wireless communication systems... [10 Apr 2008]
Effect of Slow Fading and Adaptive Modulation on TCP/UDP Performance of High-Speed Packet Wireless Networks
White Paper High speed data wireless networks in multipath environments suffer channel impairment from many sources such as thermal noise, path loss, shadowing, and fading. In particular, short-term fading caused by mobility imposes irreducible error floor... [06 Dec 2007]
Improving Wireless LAN Performance Via Adaptive Local Error Control
White Paper Wireless links can exhibit high error rates due to attenuation, fading, or interfering active radiation sources. A significant challenge is ensuring that systems with multiple layers of error control avoid compromising performance by duplication of... [06 Dec 2007]
Rapid MIMO-OFDM Software Defined Radio System Prototyping
White Paper MIMO communication, enabled by the use of multiple transmit and multiple receive antennas, is known for its high spectral efficiency as well as its robustness against fading and interference. Multiple Input-Multiple Output (MIMO) is an attractive... [31 Aug 2007]
Allocating Resources to Multiple Antenna Mobile Nodes in Fading Wireless Ad-Hoc Networks With Temporally Correlated Loss
White Paper Multiple antenna systems utilizing space-time block codes are gaining increasing popularity as the result of being adopted by different wireless standards. Relying on adaptive modulation techniques for multiple antenna systems, this paper examines... [01 Aug 2007]
Multi-Code Multicarrier CDMA: Performance Analysis
White Paper A novel multi-code multicarrier code division multiple access (MC-MC-CDMA) system is proposed and analyzed in a frequency selective fading channel. The bit error rate of the system is analytically derived in frequency selective fading, with... [04 Jul 2007]
On the Influence of Phase Noise Induced ICI in MIMO OFDM Systems
White Paper It is shown that in the case of frequency flat Rayleigh fading, the influence of receiver and transmitter PN is equal. In the case of independent Rayleigh fading, however, the impact of the receiver PN is shown to depend on the ratio between the... [18 Apr 2007]
Carrier Separated OFDM Systems for Multiaccess Wireless Communications
White Paper OFDM is considered to support high data rates and carrier separation is introduced to combat multipath fading. While promising robustness against multipath fading, the computational complexity of a carrier separated OFDM system can be made to be as... [18 Apr 2007]
A Multirate Pilot-Symbol-Assisted Channel Estimator for OFDM Transmitter Diversity Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) transmitter diversity techniques have been shown to be efficient means of achieving near optimal diversity gain in frequency-selective fading channels. [14 Apr 2007]
Increasing Time Domain Diversity in OFDM Systems
White Paper Delay- and Doppler spread of multipath fading channels have already been identified as sources of diversity in wireless communications systems. This paper proposes a method for increasing the Doppler spread of the multipath fading channel without... [11 Apr 2007]
Multimedia Communication Over OFDM Mobile Wireless Networks: A Cross-Layer Diversity Approach
White Paper Diversity can be used to combat multipath fading and improve the performance of mobile wireless multimedia communication systems. In this work, by considering transmission of an embedded bitstream over a slow varying Rayleigh faded environment, the... [11 Apr 2007]
Autonomous Services and Enterprise Entity Aggregation
White Paper Service-Oriented Architectures (SOAs) have been hailed as the glue that would bring IT closer to business, yet the hype is already fading. Many of these systems depend on the same basic concepts like customer and employee and, as a result, these... [31 Mar 2007]
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