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Experiments on Coherent Adaptive Antenna Array Diversity for Wideband DS-CDMA Mobile Radio
White Paper In Wideband direct sequence Code Division Multiple Access (W-CDMA), employing an adaptive antenna array is a very promising technique to reduce severe Multiple Access Interference (MAI) from high rate users. [03 Jul 2008]
Sub-Carrier Based Weight Technique for OFDM Systems
White Paper This paper presents a new method to extend adaptive antenna array techniques to mitigate strong co-channel interference in an orthogonal frequency division multiplexing system. The proposed algorithm uses optimal weights determined from classical... [03 Jul 2008]
Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System
White Paper It is shown that combining channel tracking and adaptive power allocation can dramatically enhance the outage capacity of an OFDM multiple-antenna system when severing fading occurs. This paper proposes combining channel estimation and optimal... [03 Jul 2008]
Multiuser OFDM Capacity Analysis With Partial Channel Information
White Paper This paper studies multiuser orthogonal frequency division multiplexing (OFDM) system using adaptive subchannel and power allocation with partial channel information. The capacity gain using adaptive resource allocation over fixed resource... [10 Apr 2008]
Adaptive Resource Allocation in Multiuser OFDM Systems With Proportional Fairness
White Paper Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular and wireless LAN systems. In this paper, we impose a set of proportional fairness constraints to... [10 Apr 2008]
Testing TCP Westwood+ Over Transatlantic Links at 10 Gigabit/Second Rate
White Paper The main feature of Westwood+ TCP is its adaptive setting of the control windows after a congestion episode obtained by estimating the bandwidth available along the connection path. The investigation has been conducted at the CERN - IT division... [20 Dec 2007]
A Software and Hardware Evaluation of Revolutionary Turbo MIMO OFDM Schemes for 5GHz WLANs
White Paper A harmonized physical layer is specified offering up to 54 Mbits/s using rate adaptive Coded Orthogonal Frequency Division Multiplexing (COFDM). Globally, WLANs operating in the 5GHz band have been standardized by the IEEE (North America), ETSI... [11 Apr 2007]
Rate and Power Adaptation in OFDM With Quantized Feedback
White Paper Adaptive modulation can be used in conjunction with Orthogonal Frequency Division Multiplexing (OFDM) to obtain high spectral efficiencies. This paper analyzes two types of adaptive OFDM systems with quantized feedback. [11 Apr 2007]
Adaptive OFDM Techniques With One-Bit-Per-Subcarrier Channel-State Feedback
White Paper Adaptive techniques can be applied to mitigate this effect if the Channel-State Information (CSI) is available at the transmitter. Three adaptive approaches are considered to exploit such a CSI feedback: adaptive subcarrier selection; Adaptive... [11 Apr 2007]
MU-OFDM Power and Subchannel Allocation Performance on DSP
White Paper In order to maximize the capacity of a time-varying channel, wireless transceiver designers often implement adaptive modulation that adjusts transfer parameters such as power distribution, coding and modulation schemes, and signaling bandwidth. [11 Apr 2007]
Interference Avoidance Dynamic Adaptive OFDM Using a Reconfigurable Radio Platform
White Paper This paper presents an advanced wireless communications system using an enhanced version of Orthogonal Frequency Division Multiplexing (OFDM)/Adaptive OFDM (OFDMA) called Dynamic Adaptive OFDM (DAOFDM). [11 Apr 2007]
Pilot-Tone Based ZP-OFDM Demodulation for an Underwater Acoustic Channel
White Paper Existing coherent underwater acoustic communication systems rely on single carrier transmission and adaptive decision feedback equalization to deal with time-varying and highly dispersive UnderWater Acoustic (UWA) channels. [11 Apr 2007]
Development of an OFDM Based High Speed Wireless LAN Platform Using the TI C6x DSP
White Paper Each standard operates using adaptive sub-band Quadrate Amplitude Modulation (QAM) and offers a maximum data rate of 54 Mbits/s over a 20 MHz channel. Coded Orthogonal Frequency Division Multiplexing (COFDM) is currently specified in all three of... [11 Apr 2007]
Weight Tracking Method for OFDM Adaptive Array in Time Variant Fading Channel
White Paper In Orthogonal Frequency Division Multiplexing (OFDM) system, in order to reduce the influence of Co-Channel Interference (CCI), Minimum Mean Square Error-Adaptive Array Antenna (MMSE-AAA) is attractive. [11 Apr 2007]
Adaptive Prediction Iterative Channel Estimation for OFDM Signal Reception in a Frequency Selective Fading Channel
White Paper In this paper, pilot-assisted adaptive prediction iterative channel estimation is proposed for the antenna diversity reception of Orthogonal Frequency Division Multiplexing (OFDM) signals. Adaptive prediction filtering is incorporated into... [11 Apr 2007]
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