Aims & Learning |
To introduce students to the basic principles of communications and to provide a good understanding of the techniques used in modern electronic communication systems. At the end of this module students should be able to explain and analyse the basic methods of generation and detection of modulated signals; calculate the available power of a modulated signal; analyse the operation of first and second order phase locked loops; understand the function of source, channel and line coders in digital transmission systems and the limitations imposed by restricted bandwidth and signal to noise ratio; describe the characteristics and relative performance of the various digital modulation schemes.
Communication systems and channels, media characteristics, amplitude and phase distortion, non-linear distortion. Physical sources and statistical properties of electrical noise. Evaluation of noise: signal-to-noise ratio, noise figure, noise temperature. Analogue modulation systems: methods of generating amplitude modulated signals, qualitative introduction to angle modulation. Phase lock loops. Radio transmitter and receiver architecture. Functional elements of a digital communications system. Source entropy and coding. PCM and quantisation noise. Bandwidth, signalling rate and multi-level signals. Information rate, symbol rate and bandwidth efficiency. Noise and error probability, the Shannon-Hartley theorem, SNR bandwidth trade-off, BER and error control. Spectrum shaping and intersymbolic interference. Digital signal formats, spectral properties, clock encoding and recovery. Digital modulation generation and detection of ASK, FSK, PSK, DPSK and QPSK.