Coding

Voice

Coding

Symbol

Coding

Line

Coding

Ordinary

Speech

Radio

Wave

Coding Scheme

/ Standard

Coding Rate

Compression

Frequency

/ Bandwidth

ADPCM

CCITT G.721

ANSI T1.301

8K samples/second

8-bit/sample

50%

32Kbps

Code Division

Spread Spectrum

with Time-Division

Duplex (TDD)

3-bit/symbol

32-chip/symbol

10.667 chips/bit

+10.3dB processing gain

1.365M chips/second

GMSK/MSK

1-chip/line code

1.5Hz per chip

2.048MHz per

voice channel

ADC

PCM

PN code

Spreading

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