Are there technological similarities between EV-DO and the GSM family of technologies?
EV-DO uses many of the same techniques for optimizing spectral efficiency that HSPA does, including higher order modulation, efficient scheduling, turbo-coding, adaptive modulation and coding, though the technology standards are not interoperable. For these reasons, it achieves spectral efficiency that is virtually the same as UMTS-HSPA. The 1x technologies operate in the 1.25 MHz radio channels, compared to the 5 MHz channels used by UMTS, resulting in lower theoretical peak rates, but similar average throughputs for high level of network loading. Under low- to medium-load conditions, because of the lower peak achievable data rates, EV-DO or EV-DO Rev A achieves a lower typical performance level than HSPA. CDMA operators have quoted 400 to 700 kbps typical throughput on the downlink for EV-DO Rev 0 and between 600 kbps and 1.4 Mbps for EV-DO Rev A.
