OFDM (Orthogonal Frequency Division Multiplexing)-based PLC (Power Line Communication) system subcarrier bit parallel loading method
A sub-carrier and bit-bit technology, which is applied in the field of sub-carrier bit-bit parallel loading scheme design in the power line communication system, can solve the problem of high computational complexity
Inactive Publication Date: 2016-01-13
嘉兴国电通新能源科技有限公司 +2
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In order to reduce the complexity, the author of this document also improved the GBL method, that is, the complexity reduction of the GBL method is realized by iterative inversion. We call it the improved GBL method. However, it can be seen from the essence that this method Although the complexity is reduced to a certain extent, the overall number of iterations has not been reduced, so the total computational complexity is still high
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[0022] In order to make the purpose and effect of the present invention clearer, the OFDM power line communication system model and the method of the present invention will be described in detail below.
[0023] Different from the traditional OFDM system, this paper considers a single-user plus window OFDM system. Suppose the system has a total of U subcarriers, the total bandwidth occupied is BMHz, and the cyclic prefix length of the OFDM system is T cp |s (here, s stands for unit: second): T cp =GI+RI, where GI is the guard interval and RI is the roll-off length. In traditional OFDM systems, generally RI = 0, but not equal to zero in PLC systems. In addition, the OFDM symbol length is Ts, where T=T 0 +GI,T 0 is the FFT window period, is the subcarrier spacing. Assuming that L subcarriers are used to transmit data among U subcarriers, according to the principle knowledge of multi-carrier communication systems, the nth 0 mth OFDM symbol 0 demodulated samples y(m 0 ,n...
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The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing)-based PLC (Power Line Communication) system subcarrier bit parallel loading method. The method comprises the following steps: a used subcarrier set, a total transmission power constraint value and the maximal transmission power constraint value allowed by each subcarrier are set firstly; then, based on dichotomy, partial subcarrier bits are found out for parallel loading, and a corresponding transmission power allocation vector is obtained; according to the transmission power allocation vector and power constraint conditions, increasing or decreasing of the number of next-turn parallel subcarriers is determined, the above steps are repeated until the number of parallel subcarriers is smaller than 1, and the last transmission power allocation vector and the bit allocation vector can be obtained; and finally, a transmitting end maps a transmitting signal to each subcarrier according to the determined bit allocation vector, the transmission power of each subcarrier is set and thus information transmission of the PLC system is realized. Through parallel bit loading of multiple carriers, computational complexity of the system is thus reduced.
Description
technical field [0001] The present invention relates to the technical field of power line communication (PLC, PowerLineCommunication), in particular to the design of a subcarrier bit parallel loading scheme for a power line communication system based on Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology. Background technique [0002] Power line communication refers to the use of power lines as the transmission medium to realize data exchange and information transmission between various nodes of the power line communication network and between the power line communication network and other communication networks. Power line carrier communication technology has been developed for decades in China. In particular, with the development of smart grids in recent years, high-speed, real-time, and stable power line communication networks have become an important part of smart grids. It can be seen that this This technology is deve...
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IPC IPC(8): H04B3/54H04L27/26H04L25/03H04L5/00
Inventor 史清江彭成齐世强潘博秦鹏苏广波
Owner 嘉兴国电通新能源科技有限公司