Abstract

The HomePlug Green PHY (HomePlug GP) specification provides an attractive solution to enable smart grid power line communication (PLC) applications by using robust orthogonal frequency division multiplexing (ROBO) mode. This paper proposes a computationally efficient sampling frequency offset (SFO) estimation technique in the HomePlug GP system without relying on pilot symbols. For this purpose, the proposed estimation scheme utilizes the redundant information contained within the repeat coding in the HomePlug GP ROBO mode, thus eliminating the need of dedicated pilots. Computer simulations are conducted to assess the performance of the proposed SFO estimation scheme and to compare it with the conventional decision-directed (DD) estimation schemes. Simulations indicate that the repeat coded ROBO signals are effectively used for the proposed estimation scheme, which provides an affordable estimation accuracy while reducing the complexity compared to the conventional DD estimation schemes.

Highlights

  • Power line communication (PLC) technology has received significant attention as a highly competitive candidate for smart grid applications since the PLC infrastructure is already widely deployed and the use of the power line network for communication purposes does not demand any extra cost

  • This paper proposes a computationally effective sampling frequency offset (SFO) estimation scheme for the Orthogonal frequency division multiplexing (OFDM)-based HomePlug GP system, which does not require a priori knowledge on pilot symbols nor channel side information (CSI)

  • To fully obtain the advantageous features of OFDM in the HomePlug GP system, it is very important to maintain the frequency synchronization between the transmitter and the receiver

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Summary

Introduction

Power line communication (PLC) technology has received significant attention as a highly competitive candidate for smart grid applications since the PLC infrastructure is already widely deployed and the use of the power line network for communication purposes does not demand any extra cost. A widely known problem of OFDM is its vulnerability of the receiver to oscillator instabilities such as carrier frequency offset (CFO) and sampling frequency offset (SFO). Used synchronization algorithms take advantage of repetitive patterns of pilot symbols to estimate CFO and SFO [16,17,18,19,20,21,22]. The DD method has a long processing delay and high computational burden due to tentative decoding To solve this problem, this paper proposes a computationally effective SFO estimation scheme for the OFDM-based HomePlug GP system, which does not require a priori knowledge on pilot symbols nor channel side information (CSI). The proposed estimation scheme exploits a repetition structure inherent in the HomePlug GP signal using repeat coding, removing the use for decided data or dedicated pilots.

Signal Model
Conventional SFO Estimation Scheme
Conventional Scheme A
Conventional Scheme B
Conventional Scheme C
Proposed SFO Estimation Scheme
Estimation Algorithm
MSE Analysis
Complexity
Simulation Results and Discussions
Conclusions
Full Text
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