A failure prediction method for a noisy uncoded QPSK upstream HFC communication channel has been derived in this paper. This implementation is based on the relationship between the higher layer error (packet loss) and the physical layer error (bit error rate) for the HFC network. With the laboratory measurements on the HFC upstream channel characteristics and the channel analysis and modeling, we have derived an implementation plan for broadband HFC network failure prediction with additive white Gaussian noise (AWGN) impairment. This study will provide more information on fault management for HFC networks and it will also provide benefits in the development of a network management information base for the HFC network.
-This paper provides a new approach to mitigate the crosstalk interference in the symmetric digital subscriber line (SDSL) upstream transmission. A vector channel equalizer has been proposed for the SDSL upstream receiver to enhance spectral compatibility for the SDSL services. This approach outperforms a conventional scalar equalizer, which used in the current SDSL systems, is about a 15dB gain in mean squared error (MSE). It significantly suppresses the crosstalk degradation and ensures the quality of service (QoS) on the SDSL transmission throughput. Moreover, the enhancement of the SDSL receiver can benefit on the extension of the SDSL deployment coverage range and also guarantees its promising data rates on increasing numbers of customer subscribers.
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