Lecture 7: Channel capacity and multiplexing Anders Västberg 08-790 44 55.

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Presentation transcript:

Lecture 7: Channel capacity and multiplexing Anders Västberg

Concepts Data rate Channel capacity Signal Bandwidth Channel Bandwidth Noise Error rate

Bandwidth limited channel Hartley’s law CChannel capacity (bit/s) MDiscrete Levels BChannel bandwidth (Hz)

Bandwidth limited and noisy channel Shannon’s law CChannel capacity (bit/s) SNR=P/NSignal to Noise ratio (not in dB!) BChannel bandwidth (Hz)

Shannon’s Law

Bandwidth and Capacity

Multiplexing The signals of the different users are multiplexed at the transmitter and then transmitted as one entity. Examples of broadcast network: Radio and TV broadcast systems Downlinks in a mobile cellular communication system Downlinks in a satellite communication system

Multiple Access Examples of Multiple Access systems: Uplink in a mobile cellular system Uplink in a satellite communication system

Multiplexing/ Multiple Access Frequency division multiplexing (multiple access) (FDM/FDMA) –Channel bandwidth greater than signal bandwidth Time division multiplexing (multiple access) (TDM/TDMA) –Channel capacity greater than signal data rate

FDM/TDM

Frequency divison multiplexing Guard band Signal bandwidth |H(f)| f

Time divison multiplexing Bit interleaving Block interleaving Synchronous TDM –Time slots fixed and pre-assigned to sources Asynchronous TDM –Time given to sources with data to send

Homework before F8 Beskriv principen för DSSS? Vad är snabb och långsam FHSS?