21-09-2008, 11:33 PM
For the last 60 years, the way radio receivers are designed and built has undergone amazingly little change. Much of the current approach could be attributed to EH Armstrong, the oft -credited Father of FM, who invented the super heterodyne method in 1918.He further developed it into a complete FM commercial system in 1933 for use in public-radio broadcasting. Today, more than 98% of receivers in radios, television and mobile phones use this method.The subsystem used in the superhet design consists of radio-frequency (RF)amplifiers mixers ,phase-lock loops ,filters, oscillators and other components ,which are all complex ,noisy ,and power hungry. Capturing a communications element from the air to retrieve its modulated signal is not easy ,and a system often needs to spend thousands of carrier cycles to recover just one bit of information .This process of demodulation is inefficient ,and newly emerging schemes result in complex chips difficult and expensive to manufacture.So it was necessary to invent a new demodulation circuit ,which do the job of conventional superheterodyne receiver but at afar lesser component count, faster and lower in power consumption and possessing greater signal robustness These requirements were met by designing a circuit which models the biological cell behavior as explained earlier. The technology for this, named CELLONICS ,was invented by scientists from CWC(Center for Wireless communication) and Computational Science Department in Singapore. The Cellonics technology is a revolutionary and unconventional approach based on the theory of nonlinear dynamical systems and modeled after biological cell behavior. When used in the field of communication, the technology has the ability to encode, transmit and decode digital information powerfully over a variety of physical channels, be they cables or wirelessly through air
