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The Effect of Feedback Quantization on the Throughput of a Multiuser Diversity Scheme

The impact of the quantization of SNR measurements on the throughput of a multiuser diversity scheme for constant-rate transmission is investigated under a block-Rayleigh fading assumption. In the downlink, each user measures its SNR, quantizes it, and feeds it back to the transmitter, which transmits a packet to the user with the highest quantized SNR. In the case of several users having the same

HIV-2 infection in Guinea-Bissau, West Africa, with special reference to clinical, immunological and epidemiological aspects

Popular Abstract in Swedish HIV-2 isolerades första gången 1986, fem år efter att de första fallen av AIDS (orsakade av HIV-1) hade upptäckts i USA. Undersökningar har visat att HIV-2-infekterade individer också kan utveckla AIDS på samma sätt som HIV-1-infekterade personer, men smittsamheten är lägre och inkubationstiden från smitta till symtom förefaller vara längre för HIV-2 jämfört med HIV-1. We have followed a cohort of police officers in Guinea-Bissau between 1990 and 1997 for the study of clinical, immunological and epidemiological aspects of HIV-2 infection. Initially the prevalence of HIV-2 was high (11.6 %) and HIV-1 infection was rare (0.4 %), but over the study period the prevalence of HIV-1 increased significantly whereas the incidence of HIV-1 was relatively stable. For HIV-2

Y-peel characterization of adhesively-bonded carton board: an objective method

Carton board packages are often closed with an adhesive. The adhesive joint thus formed has to meet the demands during the entire product life from converting to end-use. The adhesive joint has to be characterized if it is good or bad for the actual application. Today such characterization is done by manually peeling the joint, immediately after the adhesive application in the gluing machine. The

Perspektiv på Världspolitik

Under de senaste tio åren har intresset för studier i internationell politik ökat kraftigt. Samtidigt har forskningsområdet breddats både avseende vad som studeras, exempelvis kapprustning, miljörörelser eller historisk utveckling, och hur det studeras. Perspektiv på världspolitik tar fasta på dessa förändringar och betonar ämnets bredd samt ger en nyanserad och djuplodande presentation av såväl