Psychosomatic aspects of shame in homeopathy

Foerster, Gisela

doi:10.1055/s-2005-868682

Cited by 1 publication

(1 citation statement)

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“…We have researched MIMO-UWB systems using the frequency domain equalization (FDE) technique [7] using the minimum mean square error (MMSE) spatial filtering (MMSE-FDE) technique. These studies were performed us- ing computer simulations with multipath models such as the S-V model [8] or the IEEE 802.15.3a model [9]. However, these models are not necessarily applicable in MIMO environments because we must consider the fading correlation between antennas in such environments.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of MIMO-UWB Systems Using Measured Propagation Data and Proposal of Timing Control Scheme in LOS Environments

Takahashi

Nishimura

Ogawa

et al. 2009

IEICE Trans. Commun.

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SUMMARYUltrawide-band impulse radio (UWB-IR) technology and multiple-input multiple-output (MIMO) systems have attracted interest regarding their use in next-generation high-speed radio communication. We have studied the use of MIMO ultrawide-band (MIMO-UWB) systems to enable higher-speed radio communication. We used frequency-domain equalization based on the minimum mean square error criterion (MMSE-FDE) to reduce intersymbol interference (ISI) and co-channel interference (CCI) in MIMO-UWB systems. Because UWB systems are expected to be used for short-range wireless communication, MIMO-UWB systems will usually operate in line-of-sight (LOS) environments and direct waves will be received at the receiver side. Direct waves have high power and cause high correlations between antennas in such environments. Thus, it is thought that direct waves will adversely affect the performance of spatial filtering and equalization techniques used to enhance signal detection. To examine the feasibility of MIMO-UWB systems, we conducted MIMO-UWB system propagation measurements in LOS environments. From the measurements, we found that the arrival time of direct waves from different transmitting antennas depends on the MIMO configuration. Because we can obtain high power from the direct waves, direct wave reception is critical for maximizing transmission performance. In this paper, we present our measurement results, and propose a way to improve performance using a method of transmit (Tx) and receive (Rx) timing control. We evaluate the bit error rate (BER) performance for this form of timing control using measured channel data. key words: MIMO-UWB, LOS (line-of-sight) environment, frequencydomain equalization, transmit and receive timing control

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Section: Introductionmentioning

confidence: 99%