Fujitsu Develops Transmission Amp for Mobile WiMax Handsets.Tokyo, Japan, Apr 18, 2007 - (JCN JCN Japan Corporate News JCN Journal of Cognitive Neuroscience JCN Journal of Cardiovascular Nursing JCN Journal of Christian Nursing JCN Job Control Number JCN Journal of Child Neurology JCN joint communications network (US DoD) ) - Fujitsu announced on April 13 that it has developed a high efficient transmission amp for mobile WiMax See WiMAX and 802.16. handsets which maximized talking time by 50 percent and upload traffic speed by 50 percent with double the amp efficiency. A problem with WiMax's Orthogonal Frequency Division Multiplex (OFDM (Orthogonal Frequency Division Multiplexing) A digital transmission technique that uses a large number of carriers spaced apart at slightly different frequencies. ) was maintaining high power output of transmission amps. Transmission amps mount linearized circuits for fixing strains and consumed much electricity. To solve this problem, Fujitsu used a linearized circuit that was primarily used in base stations and OFDM processed. By fixing transistor size and matching circuit, the new transmission amp achieves 64QAM (1) (Quality Assessment Measurement) A system used to measure and analyze voice transmission. (2) (Quadrature Amplitude Modulation) A modulation technique that employs both phase modulation (PM) and amplitude modulation (AM). - an efficiency of 1.5 fold over conventional 16QAM with transmission speed up from 9Mbps to 13.5 Mbps. Copyright [c] 2007 Japan Corporate News Network. All rights reserved. |
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