7.32. Data has to be transmitted from a remote space probe via an RF link. The baseband data signal has a bandwidth of 1.5 MHz and a normalized power of watt. CW modulation is used to transfer the data signal on to an RF carrier. The RF channel introduces a power loss of 60 dB and adds white noise with a psd of n/2 = 10-¹2 watt/Hz. For proper decoding of the data, it is required that (S/N) at the output of the receiver be >20 dB. The power source on the space probe can supply an average power of 10 watts to the RF transmitter on board. Design a suitable CW modulation/demodulation scheme for this application.

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Antenna Characteristics

The antenna is an important concept in the domain of electronics and communication engineering. An antenna forms an integral part of many commonly used devices such as wireless modems, routers, game controllers, mobile phones, bluetooth devices, and so on. In simple terms, any wireless communication makes use of antennas to serve the purpose. An antenna, also known by the term 'arial', is an electrical device that converts electrical signals into electromagnetic waves or electromagnetic waves into electrical signals. An antenna contains a transmission line usually made up of co-axial cable, it then receives the signals and converts them into electromagnetic waves, which are then transmitted via space into their required destination. A communication system essentially makes use of two antennas, a transmission antenna, which converts electrical signals into electromagnetic waves, and a receiving antenna, which receives the electromagnetic waves and converts them back into electrical signals.