Communicating method and device of power line carrier OFDM system

Abstract

The invention discloses a communicating method of a power line carrier OFDM system. The communicating method comprises the steps of grouping K available subcarriers Ck to form L channel groups G1, wherein each of the subcarriers Ck exclusively belongs to one of the channel groups G1, data to be sent are allocated to the channel groups G1, and data transmission is performed in the channel groups G1 the data are allocated. The invention further discloses a communicating device of the power line carrier OFDM system based on the method. The excellent spectrum efficiency and transmission efficiency can be obtained through dynamic dispatching and channel resource allocation of the OFDM system, and one OFDM physical frame can bear data transmission meeting different transmission performance requirements simultaneously. In addition, the data distribution randomness is enhanced through grouping and interleaving of an interleaver, the problems of large depth and high processing delay are solved, and the system performance is improved.

Description

technical field [0001] The invention relates to the field of power line carrier communication, in particular to a narrowband power line communication OFDM system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) is a typical multi-carrier modulation and demodulation key technology. Later, IEEE and ITU organizations identified it as the core technology of narrowband power line communication, which is used to deal with the extremely unstable situation of power line network for high-speed and reliable data transmission. The IEEE1901.2 and ITU-T9955 standards under development are based on it. [0003] The frequency band of the OFDM system is actually divided into multiple orthogonal sub-carriers, and each sub-carrier can be used as a sub-channel to modulate effective data bits. [0004] In practical applications, no matter the wireless channel or the power line channel with worse channel conditions, mu...

AI Technical Summary

Problems solved by technology

However, the existing problem is that in actual operation, it is difficult to accurately estimate the characteristics of the power line channel, and the implementation cost is relatively large. Therefore, the combination of the above two strategies is usually used in practice.

This mechanism simply divides channels into available and unavailable types. However, due to the limited number of subcarriers in the system, on the one hand, shielding too many subcarriers will affect the throughput of transmission. On the other hand, pre-emphasis is required to balance the remaining The quality of the available subcarriers, making the performance of the available subcarriers similar, will also affect the performance of the original good quality subcarriers

Therefore, the spectrum utilization and transmission efficiency in this way are low, and the user experience is not high, which needs to be improved

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