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Channel Estimation For D-BLAST OFDM Systems
White Papers This paper applies D-BLAST in Orthogonal Frequency Division Multiplexing (OFDM) systems and addresses the issue of channel estimation. Different from other MIMO-OFDM, where symbols at all tones are always available for decision-directed channel...
[January 1, 1970, 0:59]
Channel Estimation Techniques Based On Pilot Arrangement In OFDM Systems
White Papers In this paper, a full review of block-type and comb-type pilot based channel estimation is given. Channel estimation based on block-type pilot arrangement with or without decision feedback equalizer is described.
[January 1, 1970, 0:59]
Channel Estimation And Prediction For Adaptive OFDM Downlinks
White Papers Channel estimation and prediction algorithms are developed and evaluated for use in broadband adaptive OFDM downlinks over fading channels for vehicular users. Accurate channel estimation may be obtained by using a combined pilot-aided and decision...
[January 1, 1970, 0:59]
Channel Estimation Techniques For OFDM Systems
White Papers Channel estimation is an important and necessary function for modern wireless receivers. The goal of channel estimation is to measure the effects of the channel on known, or partially known transmissions.
[January 1, 1970, 0:59]
Channel Estimation For OFDM Systems With Multiple Transmit Antennas By Filtering In Time And Frequency
White Papers This paper addresses pilot-symbol aided channel estimation (PACE) for orthogonal frequency division multiplexing (OFDM) based systems, with multiple transmit antennas. An approach is presented which estimates and separates NT superimposed signals...
[January 1, 1970, 0:59]
Channel Estimation And Signal Detection For Multi-Carrier CDMA Systems With Pulse-Shaping Filter
White Papers By incorporating the effect of the pulse-shaping filter in the channel estimation and signal detection modules, new estimator and detector structures have been developed, which significantly outperform the commonly used time-domain equalizers and...
[January 1, 1970, 0:59]
Channel Estimation And Optimal Power Allocation For A Multiple-Antenna OFDM System
White Papers This paper proposes combining channel estimation and optimal power allocation approaches for a multiple-antenna orthogonal frequency division multiplexing (OFDM) system in high-speed transmission applications.
[January 1, 1970, 0:59]
Channel Estimation Algorithm For Space-Time Block Coded OFDM Systems
White Papers The algorithm takes advantage of the orthogonality properties of the space-time block codes and it is therefore capable of providing channel estimates without performance degradation due to estimation errors from adjacent channel.
[January 1, 1970, 0:59]
Multi-User Transmissions For OFDM: Channel Estimation And Performances
White Papers This paper studies the performances of multi-point to point communication (also referred to as multi-user transmissions) for different receivers and with or without channel estimation. The proposed channel estimator is a multi-user maximum...
[January 1, 1970, 0:59]
Channel Estimation For OFDM Systems In Case Of Insufficient Guard Interval Length
White Papers This paper presents a novel method used to channel estimation for OFDM systems in case of insufficient guard interval length. This method improves the channel estimation performance significantly with the assumption that the channel is time...
[January 1, 1970, 0:59]
Channel Estimation For Bit-Loading In OFDM-Based WLAN
White Papers In this paper, the feasibility of bit-loading techniques for WLAN is evaluated driving to the conclusion that channel estimation is a very important issue. DFT-based channel estimation is explored considering frequency and time characteristics of...
[January 1, 1970, 0:59]
Channel Estimation For OFDM Systems With Multiple Transmit Antennas By Exploiting The Properties Of The Discrete Fourier Transform
White Papers This paper addresses channel estimation based on the discrete Fourier transform (DFT) applied to OFDM-based MIMO systems. By exploiting the properties of the DFT, channel estimation schemes for MIMO-OFDM system can be simplified.
[January 1, 1970, 0:59]
Channel Estimation In Two Dimensions For OFDM Systems With Multiple Transmit Antennas
White Papers This paper addresses pilot-symbol aided channel estimation (PACE) for orthogonal frequency division multiplexing (OFDM) based systems, employing multiple transmit antennas. More specifically, the concept of using two one dimensional (1D) estimators...
[January 1, 1970, 0:59]
Channel Estimation And Multiuser Detection For Long Code CDMA
White Papers In a long code CDMA system, subspace technique is directly applied to downlink channel estimation when spatial/temporal diversity is available. Detection of the desired user is performed by typical linear techniques after channel is estimated.
[January 1, 1970, 0:59]
Channel And Frequency Offset Estimation For A MIMO-OFDM System
White Papers This paper presents the channel and frequency offset estimation scheme using a preamble with four OFDM symbol duration for the MIMO-OFDM system in WLANs. An OFDM technique has been utilized for Wireless Local Area Networks (WLANs).
[January 1, 1970, 0:59]
Optimum Power Control For Successive Interference Cancellation With Imperfect Channel Estimation
White Papers In this paper an optimal power control strategy is derived specifically designed to maximize the overall capacity under the constraint of a high degree of estimation error. Successive interference cancellation, in conjunction with orthogonal...
[January 1, 1970, 0:59]
An EM-Based Channel Estimation Algorithm For OFDM With Transmitter Diversity
White Papers This paper studies channel estimation for OFDM systems utilizing transmitter diversity and operating over multipath fading channels. An expectation-maximization (EM) based algorithm is introduced and compared to least-squares based estimation...
[January 1, 1970, 0:59]
Rotated Walsh-Hadamard Spreading With Robust Channel Estimation For A Coded MC-CDMA System
White Papers This paper investigates rotated Walsh-Hadamard spreading matrices for a broadband MC-CDMA system with robust channel estimation in the synchronous downlink. In a multiuser MC-CDMA system, possible performance improvements are based on the chosen...
[January 1, 1970, 0:59]
Joint Dynamic Detection And Channel Estimation In MIMO OFDM Systems
White Papers Transmitter diversity and channel estimation play important roles in improving the system performance. MIMO OFDM is one of the most promising techniques to achieve high data rate over mobile wireless channels.
[January 1, 1970, 0:59]
Iterative Channel Estimation Approach For Space-Time/Frequency Coded OFDM Systems With Transmitter Diversity
White Papers Focusing on transmit diversity orthogonal frequency division multiplexing (OFDM) transmission through frequency selective channels, this paper pursues novel iterative channel estimation approaches for both space-frequency OFDM (SF-OFDM) and space...
[January 1, 1970, 0:59]
