Why is LTE not backwardly compatible with HSPA

Why is LTE not backwardly compatible with HSPA
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Because they use different radio technologies.
HSPA is based on code division multiple access (CDMA).
LTE is frequency division multiple access (FDMA).

That doesn't mean a mobile device can't use both technologies, and hand off (seamlessly) between them, though.

Wikipedia has numerous comparison pages - here's one: http://en.wikipedia.org/wiki/Comparison_of_wireless_data_standards
nociSoftware EngineerCommented:
Even within one type of technology you can have incompatibilities.
depending on country the frequency differences can be diverse enough to get antenae problems when bringing equipment from one country to another. (Anteanae beeing too short / too long for the environment the equipment is used in).
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