LTE Physical Layer compared to HSPA

LTE physical layer comparison to HSPA.

LTE builds on the learning of several WCDMA/HSPA Releases and covers from the start HARQ, BTS scheduling and adaptive coding and modulation (+ multiple antenna TX/RX with MIMO).

LTE eNodeB is similar to Base station of other technologies such as WCDMA, GSM etc. eNodeB Physical layer consists of Channel coding,rate matching, scrambler, mapper, layer mapping, pre-coding, resource element mapper, ofdm module.

Feature LTE HSUPA HSDPA
Multiple Access OFDMA, SC-FDMA WCDMA WCDMA
Largest BW 20 MHz 5 MHz 5 MHz
Fast power control No Yes No (associated DCH only)
Soft handover No Yes No (associated DCH only)
Adaptive modulation Yes Yes Yes
BTS based scheduling Time/Freq Time/Code Time/Code
Fast L1 HARQ Yes Yes Yes
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