CDMA Variable Rate Speech Coder
CDMA takes advantage of quiet times during speech to raise capacity. A variable rate vocoder is used; for the original vocoder the channel is a 9,600 bps when the user…
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Why Closed Loop Power Control in CDMA
Closed loop power control is used to allow the power from the mobile unit to deviate from the nominal as set by open loop control. This is done with a…
How Forward Link Traffic Channel Physical Layer in CDMA
Voice data at 9600 bps or 14400 bps (full rate) is first passed through a convolutional encoder, which doubles the data rate for the 9600 bps case or increases it…
CDMA Vocoders how and why
Vocoders Convert Voice to/from Analog Using Data Compression There are Three CDMA Vocoders: IS-96A Variable Rate (8 kbps maximum) CDG Variable Rate (13 kbps maximum) EVRC Variable Rate (improved 8…