A power allocation optimization method suitable for medium voltage carrier system

Abstract

The invention discloses a power distribution optimization method suitable for a medium-voltage carrier system, comprising: obtaining a frequency domain sequence to be fast Fourier inverse transformed after processing a message sent by a transmitting end; inserting a pilot used for a fixed frequency domain sequence ; Perform fast Fourier inverse transform to each symbol of the obtained frequency domain sequence to generate time domain data, and send the time domain data to the receiving end after processing; the receiving end generates the frequency domain sequence after processing the received time domain data; Calculate the signal-to-noise ratio and channel gain of the sub-channel by using the pilot information of the end and the receiver; use the water filling algorithm to redistribute the power of the system and the bits of the channel. The present invention optimizes the original water injection algorithm, screens out subcarriers with poor quality and adjusts the number of transmission bits of the subcarriers based on a prescribed modulation mode, so that the power allocated to the subcarriers in the system reaches the maximum number of transmission bits, and an optimal power allocation ratio is obtained. 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, and the OFDM (Orthogonal Frequency Division Multiplexing) technology has received extensive attention due to its high spectrum utilization, strong anti-interference ability and many other advantages. An important feature of the OFDM system is that a wideband channel is divided into multiple mutually orthogonal parallel narrowband sub-channels. Therefore, adaptive modulation can be performed on each sub-carrier according to the channel characteristics of each sub-channel, and the system can be dynamically allocated for transmission. power to improve spectrum utilization. [0003] According to different optimization objectives, optimiza...

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

Images