Question: In a TDD wireless communication system, what is the primary distinction between Bit Error Ratio (BER) and Block Error Ratio (BLER) in terms of their calculation basis?
Option 1: BER considers all data bits above the convolutional/turbo decoder, while BLER focuses on Transport Blocks with incorrect cyclic redundancy checks (CRC).
Option 2: BER is calculated based on erroneous Transport Blocks, whereas BLER is determined by individual bit errors above the decoder.
Option 3: Both BER and BLER are calculated solely based on Transport Block errors, differing only in their application layers.
Option 4: The distinction lies in the encoding scheme used for calculation, with BER using convolutional coding and BLER using turbo coding exclusively.
Explanation: This is correct because Bit Error Ratio (BER) focuses on the ratio of individual bits wrongly received to all data bits sent, above the convolutional/turbo decoder. In contrast, Block Error Ratio (BLER) concerns the ratio of erroneous blocks (identified by incorrect CRC in Transport Blocks) to total blocks sent, highlighting a distinction - one being bit-centric and the other block-centric.