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 MikrofonHögtalare Source codingSource decoding Digitalizating compression 0110 Error managementError control Bitfel Flow control ModulationDemodulation NACK ACK Layer 6 Layer 2 Layer 1 Layer 7
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 Division Multiple Access Chip sequencies
Figure Encoding rules
Figure CDMA multiplexer
Figure CDMA demultiplexer