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A low-complexity bit-loading method for plc system based on ofdm

A low-complexity, bit-bit technology, applied in transmission systems, multi-frequency code systems, modulated carrier systems, etc., can solve the problems of difficult implementation, high computational complexity, and high complexity

Inactive Publication Date: 2018-02-16
嘉兴国电通新能源科技有限公司 +2
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Problems solved by technology

At present, most of the popular design schemes are the basic bit loading method (GBL) based on the greedy idea, but this method has high complexity and is difficult to implement
Therefore, the literature [Thanh Nhan Vo, Karine Amis, Thierry Chonavel, Pierre Siohan, "Achievable Throughput Optimization in OFDM Systems in the Presence of Interference and its Application to Power Line Networks" IEEE Transactions On Communications, Vol.62, No.5, May 2014 ], in order to reduce the complexity, the author improved the GBL method, that is, through iterative inversion to achieve the purpose of reducing the complexity of the GBL method, we call it the improved GBL method, but it can be seen from the essence that although this method A certain complexity is reduced, but the overall number of iterations has not been reduced, so the total computational complexity is still high

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  • A low-complexity bit-loading method for plc system based on ofdm
  • A low-complexity bit-loading method for plc system based on ofdm
  • A low-complexity bit-loading method for plc system based on ofdm

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Embodiment Construction

[0036] In order to make the purpose and effect of the present invention clearer, the power line OFDM communication system model and the method of the present invention are described in detail below.

[0037] Different from the traditional OFDM system, this paper considers a single-user windowed OFDM system. Assuming that the system has U sub-carriers in total, the total occupied bandwidth is BMHz, and the cyclic prefix length of the OFDM system is T cp s (here, s represents the unit: seconds): T cp =GI+RI, where GI is the guard interval and RI is the roll-off length. In the traditional OFDM system, there is generally RI=0, but it is not equal to zero in the PLC system. 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 sub-carriers are used to transmit data in U sub-carriers, according to the principle of multi-carrier communication system, the nth 0 mth in OFDM symbols 0 demodulation s...

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Abstract

The invention discloses a low-complexity bit loading method for an OFDM-based PLC system, comprising the following steps: first, the sending end determines the used subcarrier set, the total transmission power constraint value, and the maximum transmission power constraint value allowed by each subcarrier , introducing weights, the continuous throughput optimization problem is equivalent to the weighted mean square error minimization problem, and the problem is solved iteratively by combining the block coordinate descent algorithm and the dichotomy method, and then the obtained non-integer subcarrier bit number is calculated Integerization, on this basis, and then use the greedy idea to iteratively obtain the integer bit and power allocation scheme, and finally the sending end maps the signal bit stream to each subcarrier according to the allocation scheme and sets the transmission power of the subcarrier to realize the PLC system Service transmission at the sending and receiving ends. The method of the invention can not only optimize the system performance but also greatly reduce the number of iterations of the bit loading problem, thereby reducing the computational complexity of the system.

Description

technical field [0001] The invention relates to the technical field of Power Line Communication (PLC, Power Line Communication), in particular to a sub-carrier bit loading scheme of a power line communication system based on the Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology. Background technique [0002] Power line carrier communication refers to a special communication method that uses power line as an information transmission medium for voice or data transmission. In recent years, power line carrier communication has entered the digital age, and is no longer limited to the simple application of single-chip microcomputers. In particular, with the continuous development of smart grid technology, power line carrier communication is becoming a popular technology in the field of communication and even related to thousands of households. , which has been hailed as an "undiscovered golden mountain" in foreign media. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04L27/26H04B3/54
CPCH04B3/542H04L5/0046H04L5/0064H04L27/2614H04L5/0044
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
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