 = 0 is no multipath interference and m = 0.4 is significant time sidelobe interference. The general capacity formulas are Eqs. (30.1) and (30.2): Capacityforw (30.1) (j+f+g)(1+h)+m Capacity reverse (30.2) We also should take into account a forward carrier in an environment SO clean that it uses up all its orthogonal codes. The bit rate R and the E/No values we are using are information rates, before for- ward error correction (FEC) is added. Let us use the cdmaOne voice channel with an information bit rate of 9.6 kbps as an example. Rate 1/2 FEC brings that to 19.2 kbps, and that FEC-coded bit stream requires an Eb/No of 2 dB to sustain a sufficient bit er- ror rate (BER). This is equivalent to a bit rate of 9.6 kbps with an Eb/No of 5 dB. The extra 3 dB is the factor of 2 in the rate 1/2 FEC. We can look at R and Eb/No from either the information viewpoint (R = 9.6, Eb/No = 5 dB) or the FEC-coded viewpoint (R 19.2, Eb/No = 2 dB). These are two ways of looking at the same channel; the CDMA re- source used is the same either way. We are using the information viewpoint in these calculations. The traffic engineering we do is based on a soft-blocking model where the interference from other cells is from three equal sources. Iff=0.6, = then we model that contribution as three sectors with the same demand as the serving sector with a radio path gain five times less (0.2) than the serving path. We also divide the other-sector contribution g over two neighboring sectors on the same cell. As a reasonable point of reference, we are do- ing the traffic engineering for 20 MHz of radio bandwidth in each direction. The measure of radio spectrum efficiency is how much call activity each call can pro- vide per unit bandwidth. We measure this efficiency in how many erlangs each cell can serve for each megahertz of bandwidth, so the unit of radio spectrum efficiency is er- langs per megahertz per cell. Advanced Mobile Phone Service (AMPS) N = 7 manages about 70 erlangs in each three-sector cell using 20 MHz of radio spectrum, so 