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Various kinds of fatty acids are distributed in membrane phospholipids in mammalian cells and tissues. The degree of fatty acid unsaturation in membrane phospholipids affects many membrane-associated functions and can be influenced by diet and by altered activities of lipid-metabolizing enzymes such as fatty acid desaturases. However, little is known about(More)
Codebook based limited feedback is a practical way to obtain partial channel state information at the transmitter in a precoded multiple-input multiple-output wireless system. In this correspondence, we propose a systematic codebook design. The proposed Kerdock codebook consists of multiple mutually unbiased unitary basis matrices with quaternary alphabet(More)
Grassmannian beamforming is an efficient way to quantize channel state information in multiple-input multiple-output wireless systems. Unfortunately, multiuser systems require larger codebooks since the quantization error creates residual interference that limits the sum rate performance. To reduce the feedback requirements in multiuser systems, we propose(More)
A codebook based limited feedback strategy is a practical way to obtain partial channel state information at the transmitter in precoded multiple-input multiple-output (MIMO) wireless systems. Construction of conventional codebooks, such as Grassmannian and Fourier codebooks, relies on nonlinear search and iterative algorithms which often does not exhibit(More)
Limited feedback in multiple antenna wireless systems is a practical technique to obtain channel state information at the transmitter. When the channel is time-varying with memory, however, selected codeword may become outdated before its use at the transmitter. To overcome this problem, we propose a Grassmannian prediction and predictive coding framework(More)
— This paper presents an efficient method for updating echo canceller (EC) coefficients in ADSL transceivers during transmission that removes the dependency of updates on the far end signal. The new method improves on the frequency domain EC architecture by Ho, Cioffi, and Bingham in that it converges faster, improves the stability to perturbation, and is(More)
—Limited feedback is a paradigm for the feedback of channel state information in wireless systems. In multiple antenna wireless systems, limited feedback usually entails quantizing a source that lives on the Grassmann manifold. Most work on limited feedback beamforming considered single-shot quantiza-tion. In wireless systems, however, the channel is(More)
Linear transmit beamforming and receive combining is a low complexity approach for communications in the multiuser multiple-input multiple-output (MIMO) channel. This paper proposes a full search and two low complexity coordinated algorithms where each receiver uses a quantized combining vector. Since the optimization is performed at the transmitter with(More)
In the developing brain, excessive neurites are actively pruned in the construction and remodeling of neural circuits. We demonstrate for the first time that the pruning of neurites occurs in the simple neural circuit of Caenorhabditis elegans and that a novel transcription factor, MBR-1, is involved in this process. We identified MBR-1 as a C. elegans(More)
OBJECTIVE The goal of the study was to investigate the effects of focal brain cooling on epileptic discharges (EDs) and background rhythms in the sensorimotor cortex of anesthetized rats using spectral analysis of electroencephalography (EEG). METHODS Penicillin G was administered intracortically into superficial layers of the left sensorimotor cortex and(More)