نتایج جستجو برای: doubly dispersive channels
تعداد نتایج: 168984 فیلتر نتایج به سال:
OFDM is employed in numerous existing standards for local and metropolitan area
A new receiver structure that combines the constant modulus algorithm (CMA) and the Kalman filter (KF) is investigated to exploit the advantages of both algorithms; simple implementation of blind algorithms, and excellent tracking ability, respectively. The proposed scheme achieves faster convergence and adaptability to the channel variation, which is verified through comparative simulations in...
Cabibbo-favored nonleptonic charmed particle decays exhibit large final-state phase differences in K̄π and K̄∗π but not K̄ρ channels. It is of interest to know the corresponding pattern of final-state phases in doubly-Cabibbosuppressed decays, governed by the c → dus̄ subprocess. An experimental program is outlined for determining such phases via measurements of rates for D → K∗π and K(ρ, ω, φ) cha...
In this paper, we propose a novel concept of differentially encoded multi-carrier faster-than-Nyquist (DMFTN) signaling with noncoherent detection, which is robust against detrimental doubly selective fading channel. the proposed scheme, by approximately diagonalizing FTN-specific ISI and noise correlation matrices, traditional differential encoding detection algorithm directly applied to MFTN ...
We present preliminary results from Fermilab E791 on D 0 ? D 0 mixing and doubly Cabibbo-suppressed decays (DCSD) of the D 0 and D + mesons. The time dependence of the wrong-sign signal (D 0 ! K + ?) is used to establish separate limits on DCSD and mixing. From one third of our data we obtained r mix < 0:47%, r DCSD < 2:7% at the 90% conndence level.
Multipath Parameter Estimation and Channel Prediction for Wideband Mobile to Mobile Wireless Channel
In this paper, we investigate the estimation of multipath parameters and prediction of wideband multipath fading channels for mobile-to-mobile wireless communications. Based on a statistical model for mobile to mobile urban and suburban channels, we derive a parametrized model and utilize two-dimensional ESPRIT algorithm to jointly estimate the delay of arrival (DOA) and effective Doppler frequ...
In [1], Lindskog and Paulraj (LP) proposed a transmit diversity scheme for dispersive channels which by utilizing two transmit antennas and only one receive antenna achieves the same diversity benefit (except for the 3dB array gain) as can be achieved by using one transmit antenna and two receive antennas. This scheme generalizes Alamouti’s [11] transmit diversity scheme (which works best for f...
SUMMARY We propose a novel asynchronous direct-sequence code-division multiple access (DS-CDMA) using feedback-controlled spreading sequences (FCSSs) (FCSS/DS-CDMA). At the receiver of FCSS/DS-CDMA, the code-orthogonalizing filter (COF) produces a spreading sequence , and the receiver returns the spreading sequence to the transmitter. Then the transmitter uses the spreading sequence as its upda...
An overview on equalization schemes applicable for point-to-point communication over MIMO ISI channels is given, i.e., channels which suffer form both, multiuser interference between the data streams transmitted in parallel and intersymbol interference due to the dispersive (frequencyselective) nature of the channel. Spatial, temporal and combined spatial/temporal equalization strategies for de...
Abstract – Space-Time Block Coded (STBC) In-phase/Quadrature-phase (IQ)-interleaved Trellis Coded Modulation (TCM) and Turbo TCM (TTCM) schemes are proposed, which are capable of quadrupling the achievable diversity order of the conventional symbol-interleaved TCM and TTCM schemes, when two transmit antennas are employed. The increased diversity order of the proposed schemes provides significan...
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