Abstract

The Data-Over-Cable Service Interface Specification (DOCSIS) provides internet access via Hybrid Fiber Coax (HFC) networks. With the latest version DOCSIS 3.1, the Physical Layer changed from a Single-Carrier Quadrature Amplitude Modulation (SC-QAM) to Orthogonal Frequency Division Multiplex (OFDM). Apart from the DOCSIS standard, OFDM is used in many digital transmission systems such as Long-Term Evolution (LTE) or the most modern Digital Video Broadcasting (DVB) standards. Recent activities in the development of the 5th generation for mobile networks 5G investigated other modulation schemes beyond OFDM. One candidate was Filter Bank Multicarrier (FBMC), often used in combination with Offset QAM (OQAm). FBMC promises fewer out-of-band emissions and no overhead due to the Cyclic Prefix (CP). This paper presents an FBMC/OQAM software implementation adapted to the current DOCSIS 3.1 downstream specification. The FBMC/OQAM system is compared to the DOCSIS 3.1 CP-OFDM based downstream physical layer in terms of robustness and spectral efficiency. Simulations show that the FBMC/OQAM system can improve the spectral efficiency by approximately 10 % while providing similar robustness for HFC network channels with a short channel impulse response and a Signal-to-Noise Ratio (SNR) of less than 55 dB.

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