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Turbo-Coded ARQ Schemes for DS-CDMA Data Networks Over Fading and Shadowing Channels: Throughput, Delay, and Energy Efficiency
White Paper In this paper, modified ARQ (Automatic-Repeat-Request) techniques based on turbo coding are investigated for asynchronous DS-CDMA (Direct-Sequence Code-Division Multiple-Access) data networks under shadowing and frequency selective fading channel... [03 Jul 2008]
On Implementation of Bit-Loading Algorithms for OFDM Systems With Multiple-Input Multiple-Output
White Paper Using simulation technique the relationship between the eigenvalue (gain of eigen channel) distribution and number (finite) of total antennas under the conditions of fixed M/N or fixed number of receive antennas in Rayleigh fading channel... [03 Jul 2008]
Achievable Rate Regions for Bluetooth Piconets in Fading Channels
White Paper This paper explains the performance limits, in terms of achievable rate region, for a Bluetooth piconet operating in fading channel conditions. The paper shows how, given channel conditions and packet formats, the problem of defining the achievable... [03 Jul 2008]
Multi-Way Diversity Reception for Digital Microwave Systems
White Paper These techniques over come the problems of flat fading experienced under severe multi-path conditions that basic COFDM implementations cannot cope with. The significant performance differences between analogue FM and digital COFDM modulation... [03 Jul 2008]
BER Performances of a Differential OFDM System in Fading Channels
White Paper The two methods exhibit two essentially different behaviors in fading conditions. In an OFDM system, various modulation methods can be used in order to encode the binary information. If a differential phase modulation scheme is chosen, data can be... [11 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]
Joint PHY/MAC Based Link Adaptation for Wireless LANs With Multipath Fading
White Paper This paper investigates the effect of payload size variations on single-user throughput for both non-fading and multipath fading environments. Wireless local area networks offer a range of transmitted data rates that are to be selected according to... [03 Sep 2007]
Feasibility of Adaptive Transmission for Multicarrier and Frequency Hopping Mobile Radio Systems
White Paper This paper addresses feasibility of adaptive transmission for rapidly varying fading channels encountered in mobile communication systems. The paper describes the design and performance of adaptive transmission methods enabled by the Long Range... [31 Aug 2007]
Opportunistic Scheduling for Wireless Network Coding
White Paper These receiving nodes have time varying fading links to the transmitting node, which can generate different instantaneous conditions for different links. The paper introduces an opportunistic scheduling for such a wireless network coding, which... [23 Aug 2007]
Wireless Channel-Aware Ad Hoc Cross-Layer Protocol With Multi-Route Path Selection Diversity
White Paper Routing protocols for ad hoc networks have generally ignored channel fading. This paper proposes a new routing metric, the Route Outage Probability (ROP), which attempts to minimize packet loss due to fading. [01 Aug 2007]
BER Performance of OFDM System in Frequency-Selective Rician Fading With Diversity Reception
White Paper Both the Rayleigh and Rician fading conditions are considered. This paper theoretically studies the Bit Error Rate (BER) performance of OFDM systems with MDPSK modulation for subchannels in frequency-selective flat Rician fading and Additive White... [18 Apr 2007]
Optimized Null-Subcarrier Selection for CFO Estimation in OFDM Over Frequency-Selective Fading Channels
White Paper This paper addresses the problem of frequency synchronization in OFDM-based communications systems in the context of frequency-selective fading channels. The paper derives necessary and sufficient conditions on the number of null-subcarriers and... [14 Apr 2007]
Adaptive OFDM Techniques With One-Bit-Per-Subcarrier Channel-State Feedback
White Paper In the Orthogonal Frequency-Division Multiplexing (OFDM) scheme, some subcarriers may be subject to a deep fading. Under the conditions of a constant raw data rate and perfect feedback channel, the performance of these approaches are analyzed and... [11 Apr 2007]
Adaptive Modulation Based MC-CDMA Systems for 4G Wireless Consumer Applications
White Paper In this paper, various adaptive modulation based coded MC-CDMA systems have been studied in Rayleigh fast fading environment for the 4G wireless based consumer applications. With adaptive modulation, the bit rate per given bandwidth is no longer a... [16 Jun 2006]
Towards End-to-End QoS in Ad Hoc Networks
White Paper The experiments results show that the proposed solution provides consistent proportional differentiation for any service class and validates the claim even under bursty traffic and fading channel conditions. [12 May 2006]
