Figure 6.7:

Distorsion

Bandbredd = övre gränsfrekvens – undre

gränsfrekvens

Figure 3.6 Sine wave examples (continued)

Figure 3.9 Three harmonics

Figure 3.10 Adding first three harmonics

Figure 3.11 Frequency spectrum comparison

Point-to-point communication

Mikrofon Högtalare

Source coding Source decodingDigitalizatingcompression

0110 0110

Error management Error control.

0100010

Bitfel

0110010

Flow control Flow control

Modulation Demodulation

0110010NACKACK

Layer6

Layer2

Layer1

Layer7

Aliasing

Quantization noice

Digital modulation methods

Binär signal

ASK = Amplitude Shift Keying (AM)

FSK = Frequency Shift Keying (FM)

PSK = Phase Shift Keying (PSK)

Spread spectrum

DS-CDMA = Direct Sequence Code DivisionMultiple Access

Chip sequencies

Figure 13.15 Encoding rules

Figure 13.16 CDMA multiplexer

Figure 13.17 CDMA demultiplexer