Introduction and Forward Link Power Control
By Dr. Ernest Simo

30.0 What type of impact does Power Control have on voice quality?

Voice Quality is related to the incidence of Frame Errors on both the Forward and the Reverse Link. Specifically:
  • The percentage of Frame in Error out of the Total number of Full Rate Frames
  • The average number of consecutive Full-rate Frames in Error
These Frame Errors are largely correlated to the Bit-Energy to Noise (or Interference) density ratio Eb/No. The Frame Error Rate (FER) is also dependant on vehicle speed, local propagation conditions and the distribution of other co-channel mobiles.

Since Frame Error Rate is a direct measure of the signal Quality, CDMA quality performance will be measured in terms of FER rather than Eb/No. In other words, in order to assure a good signal Quality, it is not sufficient to maintain a Target Eb/No, it is also necessary to respond to specific Frame Errors as they occur.

Click here to view Figure 20




© 2001 DR. ERNEST SIMO - SPACE2000
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