Optical Network Unit (ONU) and Optical Line Terminal (OLT) are two basic device elements in an Ethernet Passive Optical Network (EPON). To support an optical multi-point network, the Multi-Point Control Protocol (MPCP) is being standardized in the IEEE 802.3ah Task Force (Ethernet in the First Mile -EFM) by defining a Multi-Point MAC Control sublayer as an extension of the existing MAC Control sub layer [1]. In this paper, the design and implementation of MPCP as part of ONU prototyping for EFM are described. The design is undertaken on a platform integrated with an ARM processor and FPGA. The discussions focus on methods to improve operation efficiency and hardware/firmware co-design with a well-defined interface.1.
This paper describes the hardware design of a high speed Viterbi decoder for the IEEE 802.11a Wireless Local Area Networks (WLAN) application. A fully parallel Add-Compare-Select (ACS) and trace-back architecture is presented to achieve the decoding rate up to 54Mbps. Modulation scheme and coding rate dependent quntaization accuracy for soft decision Viterbi decoding is explored and a hardware implementation scheme with run-time configurable bit-length for soft decision is then proposed to reduce the system power consumption.
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