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whitepaper However, OFDM's performance suffers from the loss of multipath diversity, and the inability to guarantee symbol detectability when channel nulls occur. Orthogonal frequency-division multiplexing (OFDM) converts a frequency-selective fading channel...
[10 Apr 2008]
whitepaper This paper proposes a novel technique to exploit this multipath induced diversity in OFDM systems. While the ISI caused by delay spread is an annoyance factor, it also provides path diversity advantage if the path gains fade independently.
[03 Apr 2008]
whitepaper Enhanced multipath diversity gains document its superior performance that is also tested by simulation. The paper derives a layered space-time scheme for multi-antenna orthogonal frequency-division multiplexed transmissions over the frequency...
[14 Apr 2007]
whitepaper The filter tap weights are adaptively updated according to changes in the multipath propagation environment. For the adaptation of tap weights, the Normalized Least Mean Square (NLMS) algorithm is applied that uses the noisy instantaneous channel...
[11 Apr 2007]
whitepaper The problem of initial acquisition of the channel parameters of a wideband CDMA signal received in a multipath fading environment with multiaccess interference is considered. Since the signal is wideband, the fading is frequency selective and the...
[10 Nov 2006]
whitepaper Specifically, it studies the effects, on the uplink capacity and coverage area, of transmit power constraints and variable power fading due to multipath. This paper studies these gains for a two-tier Code Division Multiple Access (CDMA) network in...
[16 Jun 2006]
whitepaper Mobile telephony in CDMA channels encounters a variety of communication challenges including fading due to MultiPath (MP) and MultiAccess Interference (MAI) due to simultaneous transmissions from interfering users.
[11 Jan 2006]
whitepaper Pre-RAKE precoding at the transmitter can be employed to achieve the multipath diversity without the need of the RAKE receiver at the mobile station. Transmitter diversity in the downlink of Code Division Multiple Access (CDMA) systems achieves...
[06 Oct 2005]
whitepaper Pre-RAKE precoding at the transmitter can be employed to achieve the multipath diversity without the need of the RAKE receiver at the mobile station. Transmitter diversity in the downlink for Code Division Multiple Access (CDMA) systems provides a...
[06 Oct 2005]
whitepaper In this paper, a receiver structure which combines multiuser detection (temporal filtering) and receiver beamforming (spatial filtering) in a multipath environment is considered. Efficient interference suppression techniques are needed to maximally...
[26 Jul 2005]
whitepaper Relying on block precoding, this paper develops generalized space-time coded multicarrier transceivers appropriate for wireless propagation over frequency-selective multipath channels. Multicarrier precoding maps the frequency-selective channel...
[29 Oct 2004]
whitepaper Space-frequency coded Orthogonal Frequency Division Multiplexing (OFDM) is capable of realizing both spatial and frequency-diversity gains in multipath multiple-input multiple-output (MIMO) fading channels.
[26 Oct 2004]
whitepaper However, during the transmission, ISI may also provides a multipath diversity advantage if the path gains fade independently on the different subcarriers. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme...
[26 Oct 2004]
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