Mohammad Ibrahim Mahmoud

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The polyamines spermine, spermidine and putrescine share some basic structural features with L-arginine, the substrate of nitric oxide (NO) synthase. The effects of the polyamines on neuronal NO synthase activity were studied in cytosolic preparations of rat cerebellum and cultured cerebellar granule neurons. Spermine, spermidine and putrescine all(More)
In this paper, we provide an exact closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of the phase noise, frequency offset, and amplifier nonlinearities of the soft envelope limiter (SEL). A simplified approximate expression is also obtained for the(More)
In this paper, we provide an exact closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of phase noise, frequency offset, and amplifier nonlinearities of the soft envelope limiter (SEL). This formula describes explicitly the various parameters with the(More)
In this paper, we provide a simple closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of synchronization errors (i.e. phase noise, carrier frequency offset, Doppler spread, sampling frequency offset, and timing jitter), transmitter I/Q imbalance,(More)
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