domain ofdm systems
ICI Cancellation Based Channel Estimation for OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers. [11 Apr 2008]
Frequency-Domain Equalization for OFDM Over Doubly-Selective Channels
White Paper However, it is shown that by transferring the time-domain operations to the frequency-domain, we can approach the performance of the purely frequency-selective channel. This paper proposes a new equalization technique for multi-carrier systems over... [10 Apr 2008]
Long Range Channel Prediction for Adaptive OFDM Systems
White Paper Frequency domain channel prediction on each OFDM subchannel is first explored, and it is shown that the optimum prediction filter depends only on the time-domain channel statistics under certain assumptions. [10 Apr 2008]
A Study of Channel Estimation in OFDM Systems
White Paper The channel estimation techniques for OFDM systems based on pilot arrangement are investigated. The estimation of channel at pilot frequencies is based on LS and LMS while the channel interpolation is done using linear interpolation, second order... [10 Apr 2008]
Joint Dynamic Detection and Channel Estimation in MIMO OFDM Systems
White Paper In this paper, a MIMO OFDM system is developed, which employ interleaver at the transmitter to implement frequency domain diversity. MIMO OFDM is one of the most promising techniques to achieve high data rate over mobile wireless channels. [17 Sep 2007]
Combined Frequency and Time Domain Channel Estimation in Mobile MIMO-OFDM Systems
White Paper This paper proposes a combined frequency and time domain channel estimation method for MIMO OFDM systems. Initial channel estimation is performed by first estimating the channel response in frequency domain, exploiting a set of dedicated pilot... [31 Aug 2007]
Combined Frequency and Time Domain Channel Estimation in Mobile MIMO-OFDM Systems
White Paper This paper proposes a combined frequency and time domain channel estimation method for MIMO OFDM systems. Initial channel estimation is performed by first estimating the channel response in frequency domain, exploiting a set of dedicated pilot... [10 Aug 2007]
Antenna Diversity for OFDM Using Cyclic Delays
White Paper The method is computationally highly efficient because the signal processing is done on the time-domain OFDM signals. A new technique is presented for exploiting antenna diversity in OFDM systems, which can be applied at the transmitter and/or at... [06 Aug 2007]
Frequency Domain IQ Imbalance Correction Scheme for Orthogonal Frequency Division Multiplexing (OFDM) Systems
White Paper This paper describes the sources and the effect of the IQ imbalance as well as a new method for correcting the error due to the imbalance in Orthogonal Frequency Division Multiplexing (OFDM) systems. Future, high bit rate communication systems... [31 Jul 2007]
Per-Tone Equalization for MIMO-OFDM Systems
White Paper This so-called PerTone EQualization (PTEQ) approach for MIMO OFDM systems is an attractive alternative for the recently developed Time-domain EQualization (TEQ) approach for MIMO OFDM systems. This paper focuses on Multiple-Input Multiple-Output... [18 Apr 2007]
Simple Coarse Frequency Offset Estimation Schemes for OFDM Burst Transmission
White Paper Simple methods of the estimation of that part of the frequency offset, which is a multiple of the subcarrier spacing in the OFDM (Orthogonal Frequency Division Multiplexing) systems have been proposed. [18 Apr 2007]
Eliminating the OFDM Cyclic Prefix
White Paper A novel method is presented to estimate the frame time and carrier frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) systems using a variable number of time-domain pilot signals. The performance and computational intensity of... [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]
Channel Modeling and Associated Inter-Carrier Interference Equalization for OFDM Systems With High Doppler Spread
White Paper On the other hand it shows that, considering a whole CP-OFDM symbol, this leads to a duality between equalization of the delay spread of a time-varying channel in time domain, and the equalization of the Doppler spread of a frequency selective... [18 Apr 2007]
Integer-Based Constellation Shaping Method for PAPR Reduction in OFDM Systems
White Paper In this paper, the problem of reducing the Peak to Average Power Ratio (PAPR) in an Orthogonal Frequency Division Multiplexing (OFDM) system is considered. This paper designs a cubic constellation, called the Hadamard constellation, whose boundary... [18 Apr 2007]
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