Side konspekt 2020 / eksami kordamisküsimused
This
means that the variation of the received power due to fading can be suppressed by
the transmission power control.
17. Selgita paari lausega HARQ (Hybrid Automatic Repeat Request)
tööpõhimõtet.
Hybrid Automatic Repeat-Request
• uses incremental redundancy
• user data is transmitted multiple times using different codings
• user device saves packet and combines it later with the
retransmission
*Even if the retransmitted packets are corrupted, their combination can yield an
error-free packet
• Scheme combining ARQ and Forward Error Correction
• FEC decoding based on all unsuccessful transmissions
• Stop-and-Wait (SAW) protocol
• Two basic schemes
-Chase Combining
* same data block is sent at each retransmission
- Incremental Redundancy (IR)
* Additional Redundant Information sent at each retransmission
annaabi.ee 
