Improving link reliability complexity trade-off by exploiting reliable feedback signaling

In this paper, two retransmission schemes that rely on reliable reverse link for error-free feedback message delivery are proposed. Unlike the conventional automatic repeat request schemes, the proposed schemes do not require the use of cyclic-redundancy-check bits for error detection. The first scheme is based on choosing one or more predefined packet segments for retransmission. In the second scheme, random permutations are exploited to locate the bits for retransmission in the predefined window within the packet. The complexity-performance tradeoffs of the proposed schemes are investigated by computer simulations. For the same forward transmission rate, the bit error rate performance of the second scheme is found to be superior to the first scheme, and depending on the particular implementation, the second scheme may require less feedback bits.