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—Digital pulse position modulation is an attractive modulation scheme in indoor wireless optical transmission systems because of its power efficiency. In this brief, slot synchronization by means of a reduced pulsewidth is discussed, the scheme is compared to on–off keying, and design rules for slot synchronizers are presented. The sensitivity deterioration(More)
— Digital pulse-position modulation (PPM) is attractive to apply in wireless optical-telemetry systems because of its power efficiency. Usually, the bit-error rate is assumed to depend solely on the noise level. The detrimental influence of optical interference is overlooked. In this paper, interference measurements are reported, models that describe(More)
We have found, in 7-day pokeweed mitogen stimulated cultures of peripheral blood mononuclear cells, a marked deficiency in aged men (over 75 years) in maturation of B cells to antibody-producing cells. This finding was equally true whether maturation was measured by B cells with the specific function of producing anti-sheep erythrocyte plaques or by the(More)
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