Editing Evolution-Data Optimized (section)

==== Reverse link structure ====
The reverse link (from the mobile back to the [[Base Transceiver Station]]) on EV-DO Rel. 0 operates very similar to that of [[CDMA2000|CDMA2000 1xRTT]]. The channel includes a reverse link pilot (helps with decoding the signal) along with the user data channels. Some additional channels that do not exist in 1x include the DRC channel (described above) and the ACK channel (used for [[Hybrid automatic repeat-request|HARQ]]). Only the reverse link has any sort of [[power control]], because the forward link is always transmitted at full power for use by all the mobiles.<ref name="Lucent" /> The reverse link has both open loop and closed loop power control. In the open loop, the reverse link transmission power is set based upon the received power on the forward link. In the closed loop, the reverse link power is adjusted up or down 800 times a second, as indicated by the serving sector (similar to [[CDMA2000|1x]]).<ref>[http://www.cdg.org/technology/3g/advantages_cdma2000.asp CDG: Advantages of CDMA2000] {{webarchive |url=https://web.archive.org/web/20081023022338/http://www.cdg.org/technology/3g/advantages_cdma2000.asp |date=October 23, 2008 }}</ref>

All of the reverse link channels are combined using [[code-division multiple access|code division]] and transmitted back to the base station using [[BPSK]]<ref>{{cite web|url=http://rfmw.em.keysight.com/rfcomms/refdocs/1xevdo/1xevdo_gen_rtap_rate.html|title=RTAP Rate|work=keysight.com|access-date=14 August 2015}}</ref> where they are decoded. The maximum speed available for user data is 153.2&nbsp;kbit/s, but in real-life conditions this is rarely achieved. Typical speeds achieved are between 20-50&nbsp;kbit/s.