adaptive orthogonal frequency division
Channel Pre- and Post-Equalization in Uplink OFCDM Systems With Mobility
White Paper This paper proposes an up-link Orthogonal Frequency and Code Division Multiplexing (OFCDM) mobile cellular system that uses channel pre-equalization at the Mobile Terminal (MT) and adaptive detection at the Base Station (BS). [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]
Real Time Implementation on FPGA of an OFDM Based Wireless LAN Modem Extended With Adaptive Loading
White Paper For wireless Local Area Network (LAN) the standards have chosen orthogonal frequency division multiplex (OFDM) as modulation scheme. An extension beyond the standards to improve the link capacity is adaptive loading. [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. The sum capacity of MU-OFDM is maximized when each subchannel is assigned to... [10 Apr 2008]
Feasibility of Adaptive Transmission for Multicarrier and Frequency Hopping Mobile Radio Systems
White Paper The paper describes the design and performance of adaptive transmission methods enabled by the Long Range Fading Prediction algorithms (LRP) for Orthogonal Frequency Division Multiplexing (OFDM) and slow Frequency-Hopping Spread Spectrum (FH/SS... [31 Aug 2007]
Feasibility of Adaptive Transmission for Multicarrier and Frequency Hopping Mobile Radio Systems
White Paper The paper describes the design and performance of adaptive transmission methods enabled by the Long Range Fading Prediction algorithms (LRP) for Orthogonal Frequency Division Multiplexing (OFDM) and slow Frequency-Hopping Spread Spectrum (FH/SS... [10 Aug 2007]
Adaptive Modulation Techniques for Duplex OFDM Transmission
White Paper The design tradeoffs of turbo-coded burst-by-burst adaptive Orthogonal Frequency Division Multiplex (OFDM) wideband transceivers are analyzed. This paper demonstrates that upon aiming for a higher throughput a higher proportion of low-quality OFDM... [18 Apr 2007]
Precoded OFDM With Adaptive Vector Channel Allocation for Scalable Video Transmission Over Frequency-Selective Fading Channels
White Paper The precoded Orthogonal Frequency Division Multiplexing (OFDM) system with adaptive vector channel allocation can provide more protection against errors to more important layers in the layered bit stream structure of scalable video. [18 Apr 2007]
Modified SMI Techniques for Frequency Selective Channels in OFDM
White Paper In this paper, windowing techniques are applied in order to calculate a beamformer per subcarrier for Orthogonal Frequency Division Multiplexing (OFDM) systems with very limited known training. The Sample Matrix Inversion (SMI) algorithm has been... [14 Apr 2007]
Non-Data-Aided Carrier Offset Estimators for OFDM With Null Subcarriers: Identifiability, Algorithms, and Performance
White Paper The ability of orthogonal frequency-division multiplexing systems to mitigate frequency-selective channels is impaired by the presence of Carrier Frequency Offsets (CFOs). This paper proposes new approaches that do not suffer from the lack of... [14 Apr 2007]
Blind and Semiblind Spatio-Temporal Diversity for OFDM Systems
White Paper Adaptive antenna arrays can be used to improve the performance of Orthogonal Frequency Division Multiplexing systems. They are usually applied in the frequency domain, after the FFT demodulation. A blind method is firstly proposed for the... [14 Apr 2007]
Noise Plus Interference Power Estimation in Adaptive OFDM Systems
White Paper Noise variance and Signal-To-Noise Ratio (SNR) are important parameters for adaptive Orthogonal Frequency Division Multiplexing (OFDM) systems since they serve as a standard measure of signal quality. [13 Apr 2007]
On the Design of Robust Multiband OFDM Ultra-Wideband Receivers
White Paper This paper analyzes the effects of NarrowBand Interferences (NBI) on the performance of a Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-WideBand (UWB) receiver and proposes efficient schemes for signal reception and... [13 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]
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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