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end2end100

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To achieve 100Gbps wireless transmission, not only a very fast physical layer is required. The effort of the analog transceiver can be wasted due to the overhead induced by the higher network layers. Delays and latencies caused by a duplex switching can dramatically reduce the goodput of the link. In every microsecond of a delay, 12.5kB of the data transfer is wasted. Therefore, we need to extend the frame size, but that will lead to a higher packet error rate.
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This paper presents a hardware processor for 100 Gbps wireless data link layer. A serial Reed-Solomon decoder requires a clock of 12.5 GHz to fulfill timings constraints of the transmission. Receiving a single Ethernet frame on a 100 Gbps physical layer may be faster than accessing DDR3 memory. Processing so fast streams on a state-of-the-art FPGA (field programmable gate arrays) requires a dedicated approach. Thus, the paper presents lightweight RS FEC engine, frames fragmentation, aggregation, and a protocol with selective fragment retransmission. The implemented FPGA demonstrator achieves nearly 120 Gbps and accepts bit error rate (BER) up to 2e-3 . Moreover, redundancy added to the frames is adopted according to the channel BER by a dedicated link adaptation algorithm. At the end, ASIC synthesis results are presented including detailed statistics of consumed energy per bit.