EV-DO forward link in short

The forward link possesses many features that are specific to EV-DO, having been optimised for data transmission, particularly in the downlink direction. Average continuous rates of 600 kbps per sector…

Forward link EVDO channels in Detail

A number of channels are transmitted in the forward direction to enable signalling, data and other capabilities to be handled. These channels include the Traffic channel, MAC channel, Control channel…

Mobile Power Bursting in CDMA

Each 20 millisecond frame in EIA/TIA-95-B CDMA is divided into sixteen “power control groups”. When the mobile transmits, each power control group contains 1536 data symbols (chips) at a rate…

Base Station Variable Rate Vocoder

The base station uses a slightly different scheme when the vocoder moves to lower rates. First, EIA/TIA-95-B CDMA base stations do not pulse their transmissions. Rather, base stations repeat the…

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…

How Frame Formats in CDMA

Once the analog voice is compressed by one of the vocoder processes, some additional data is added to produce a frame. Each frame in CDMA is 20 milliseconds regardless of…

How Forward Error Protection in CDMA

Uses Half-Rate Convolutional Encoder Outputs Two Bits of Encoded Data for Every Input Bit Unlike many digital cellular systems, CDMA provides powerful error correction to all voice data bits. This…

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