fading
RSS fadingReplica Analysis of Large-System CDMA
White Paper It is found that the spectral efficiency of randomly spread CDMA subject to Gaussian noise and flat fading in the large-system limit under arbitrary input distributions. This paper presents some new results on large-system CDMA obtained through the... [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]
Linearly Precoded or Coded OFDM Against Wireless Channel Fades?
White Paper This paper identifies the maximum achievable diversity order for i.i.d.or correlated Rayleigh fading channels and also provide design rules for achieving maximum diversity gains with LP-OFDM. Orthogonal Frequency Division Multiplexing (OFDM... [10 Apr 2008]
An Integrated OFDM Receiver for High-Speed Mobile Data Communications
White Paper The effects of non-ideal transmission conditions of the OFDM system including channel estimation errors, symbol timing offset, carrier and sampling clock offset, phase noise and time-selective fading are analyzed. [10 Apr 2008]
Link Adaptation in OFDM Systems
White Paper OFDM is a promising digital modulation technique that effectively divides the frequency band into a number of narrow subcarriers that are each flat-fading. Link Adaptation (LA) is a powerful means of increasing throughput in wireless channels by... [10 Apr 2008]
OFDM Code-Division Multiplexing With Pre-Equalization for Mobile Communications
White Paper Different pre-equalization techniques are investigated, and it is shown that pre-equalized OFDM-CDM systems can achieve promising performance in fading channels. In this paper, the potential of orthogonal frequency-division multiplexing-code... [10 Apr 2008]
Forward-Link Capacity of a DS/CDMA System With Mixed Multirate Sources
White Paper This paper analyzes and simulates the forward-link capacity of a CDMA system with mixed multirate sources in a multipath fading channel. Some studies have been done on capacity of a code division multiple access (CDMA) system with mixed multirate... [10 Apr 2008]
Simulative Performance Optimization for TCP Over UMTS
White Paper Generally, wireless networks have many different characteristics compared to fixed networks, as the radio signal is affected by fading, shadowing and interference that also change over time. The number of Internet users and the demand for wireless... [14 Jan 2008]
End-to-End Reliability in UMTS: TCP Over ARQ
White Paper Several error patterns are investigated corresponding to random, slow and fast fading channels. The focus of this paper is end-to-end reliable transmission in UMTS environment where TCP, a reliable transport protocol designed to retransmit... [14 Jan 2008]
A Tool for Real Time Simulations of TCP/IP Over Wireless Fading Channels
White Paper This paper describes an ongoing effort to create a platform for realistic real-time simulations of wireless communication systems. The purpose of the work is primarily to evaluate the performance of existing and new approaches to provide wide area... [26 Dec 2007]
TCP Performance Enhancement Over UMTS Network With RNC Feedback
White Paper TCP optimization for wireless networks to deal with packet losses due to fading, shadowing and contention should preferably maintain TCP end-to-end semantics with minimal dependence on intermediate nodes. [26 Dec 2007]
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... [05 Dec 2007]
Freeze TCP With Timestamps for Fast Packet Loss Recovery After Disconnections
White Paper TCP optimization for wireless networks, for dealing with packet losses and disconnections due to fading, shadowing and handoffs, ideally should maintain TCP end-to-end semantics with minimal dependence on intermediate nodes. [05 Dec 2007]
High Efficiency Wireless LAN for Multimedia Home Networks
White Paper Results of channel measurements with respect to fading effects are presented. This paper describes the problems of wireless LAN usage in the user's home with focus on media transmission. The resulting link data rates are analyzed. [05 Dec 2007]
