The bit-error rate (BER) expressions are derived and verified by computer simulations in order to optimize the parameters of the retransmission schemes.. The previously proposed bitwise retransmission schemes which retransmit only selected bits to accumulate their reliability are designed and evaluated.
Unlike conventional automatic repeat request (ARQ) schemes, the bitwise retransmission schemes do not require a checksum for error detection.. The bitwise retransmission decisions and combining can be performed either after demodulation of the received symbols or after channel decoding.. The design and analysis assume error-free feedback, however, the impact of feedback errors is also considered.
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