spread orthogonal frequency division
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ICI Mitigation for Pilot-Aided OFDM Mobile Systems
White Paper Orthogonal frequency-division multiplexing (OFDM) is robust against frequency selective fading due to the increase of the symbol duration. As delay spread increases, symbol duration should also increase in order to maintain a near-constant channel... [16 May 2008]
Exploiting Multipath Induced Diversity in OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme suitable for wireless communications. It is primarily used in high bit rate systems to mitigate inter-symbol interference (ISI) caused due to de- lay spread. [03 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]
Timing Synchronization in High Mobility OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) systems divide the given bandwidth into narrow sub-channels. By transmitting low data rates in parallel on these sub-channels, OFDM systems can handle high delay spread environments. [02 Aug 2007]
On the Capacity of Wireless Systems Employing OFDM-Based Spatial Multiplexing
White Paper This paper computes the capacity of wireless Orthogonal Frequency Division Multiplexing (OFDM)-based spatial multiplexing systems in delay spread environments. The paper provide bounds on capacity, and it studies the influence of physical... [18 Apr 2007]
On Performance of SCH-OFDMA-CDM in Frequency Selective Indoor Environment
White Paper Performance of Sub Carrier Hopped Orthogonal Frequency Division Multiple Access Code Division Multiplexing (SCH-OFDMA-CDM) is analyzed and compared against its non hopping counterpart (OFDMA-CDM) in frequency selective indoor environment. [18 Apr 2007]
Transmit Diversity Vs Beamforming for Multi-User OFDM Systems
White Paper In an Orthogonal Frequency Division Multiplexing (OFDM) system, downlink beamforming can be implemented either before IDFT (frequency domain) or after IDFT (time domain) module in a base station transmitter. [18 Apr 2007]
Doppler Spread Estimation for Wireless OFDM Systems
White Paper This paper presents a method for estimating the Doppler spread in mobile Orthogonal Frequency Division Multiplexing (OFDM) systems. In OFDM systems channel estimation is popularly performed in frequency domain. [13 Apr 2007]
Exploiting Time Diversity to Improve Block Spread OFDM
White Paper A method used to implement mutually orthogonal signals is called Orthogonal Frequency Division Multiplexing (OFDM) and this is done by setting up multiple carriers at a suitable frequency separation and modulating each symbol stream separately. [11 Apr 2007]
Optimum Beamforming for Pre-FFT OFDM Adaptive Antenna Array
White Paper It is well known that Orthogonal Frequency-Division Multiplexing (OFDM) is robust to frequency-selective fading in wireless channels due to the exploitation of a guard interval that is inserted at the beginning of each OFDM symbol. [11 Apr 2007]
Spatial Multiplexing for Outdoor MIMO-OFDM Systems With Limited Feedback Constraint
White Paper This paper proposes a spatial multiplexing technique for the downlink of a Multiple-Input-Multiple-Output (MIMO) Orthogonal-Frequency-Division-Multiplexing (OFDM) system. For outdoor environments with a limited angular spread at the base station... [11 Apr 2007]
ICI Reduction Method for OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) has an increased symbol duration which makes it robust against Inter-Symbol-Interference (ISI). However, the longer symbol duration increases the Inter-Carrier-Interference (ICI) caused by Doppler... [11 Apr 2007]
PAPR Reduction Methods for Noncoherent OFDM-MFSK
White Paper MFSK (M-ary Frequency Shift Keying) can be combined with OFDM (Orthogonal Frequency Division Multiplexing) by grouping the subcarriers into groups of M and applying MFSK modulation to each groups. The detection of such an OFDM-MFSK modulation... [11 Apr 2007]
A Low Complexity ML Channel Estimator for OFDM
White Paper Orthogonal Frequency-Division Multiplexing (OFDM) with cyclic prefix enables low cost frequency-domain mitigation of multipath distortion. Expressing this correlation by the finite delay spread, the authors build a deterministic model parametrized... [26 Jul 2005]
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