Power distribution optimization method suitable for medium-voltage carrier system

Abstract

The invention discloses a power distribution optimization method suitable for a medium-voltage carrier system. The method comprises the following steps: processing a message sent by a transmitting end to obtain a frequency domain sequence to be subjected to inverse fast Fourier transform; inserting a pilot frequency for fixing the frequency domain sequence; inverse fast Fourier transform is carried out on each code element of the obtained frequency domain sequence to generate time domain data, and the time domain data is sent to a receiving end after being processed; the receiving end processes the received time domain data and then generates a frequency domain sequence; solving the signal-to-noise ratio and the channel gain of the sub-channel according to the pilot frequency information of the transmitting end and the receiving end; and redistributing the power of the system and the bits of the channels by using a water injection algorithm. According to the method, the original water injection algorithm is optimized, the subcarriers with poor quality are screened out, and the transmission bit number of the subcarriers is adjusted based on the specified modulation mode, so that the power allocated to the subcarriers in the system reaches the maximum transmission bit number, the optimal power allocation ratio is obtained, and the transmission rate is maximized on the basis of ensuring the communication success rate.

Description

technical field [0001] The invention belongs to the technical field of power line communication, and in particular relates to a power distribution optimization method suitable for a medium-voltage carrier system. Background technique [0002] At present, the field of power line communication has entered the multi-carrier modulation technology. OFDM (Orthogonal Frequency Division Multiplexing) technology has received extensive attention due to its high spectrum utilization rate and strong anti-interference ability. An important feature of the OFDM system is to divide a broadband channel into a plurality of mutually orthogonal parallel narrowband sub-channels. Therefore, according to the channel characteristics of each sub-channel, adaptive modulation can be performed on each sub-carrier, and the transmission system can be dynamically allocated. power to improve spectrum utilization. [0003] According to different optimization objectives, the optimization criteria are mainly...

AI Technical Summary

Problems solved by technology

However, the biggest defect of the water-filling algorithm is that the bit allocation of each subcarrier may be negative or non-negative real numbers, which will be very difficult to implement in practical application scenarios.

In addition, due to the limitation of the actual system, the number of bits transmitted on a single subcarrier is limited, and it cannot be transmitted completely according to the bit allocation data obtained by the water filling algorithm, which will make the power allocated to some subcarriers not enough to transmit more bits, thus limiting the transfer rate

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