A Method for Optimizing Diversity Copy Reception Performance
A technology of receiving performance and optimization method, applied in the field of communication, can solve the problems such as the inability to realize subcarrier level combining, the soft information at the decoder side cannot reach the signal-to-noise ratio, and the inability to find subcarriers, etc.
Active Publication Date: 2022-03-29
SPL ELECTRONICS TECH CO LTD
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Problems solved by technology
[0005] The existing technology has the particularity of the frame control diversity mapping stipulated in the standard protocol, and the disadvantages of the diversity and equalization reception in the modulation mode of the special constellation point mapping in the copy. The current channel equalization reception is based on multiple subcarriers as a whole to equalize the reception Yes, the bit information carried on the subcarriers participating in the combination is the same, but the subcarriers carrying the same information cannot be found, and the combination at the subcarrier level cannot be realized
[0006] Since the optimal combination cannot be performed in front of the demodulation module and then input to the demodulation module, the soft information at the decoder end cannot reach the optimal signal-to-noise ratio
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[0021] The invention provides a diversity copy receiving performance optimization method, comprising the following steps:
[0022] In the first step, according to the preamble information in the communication system, the channel estimation of all subcarriers carrying useful information for transmission is obtained:
[0023] h(k)k∈(0,N-1) (1)
[0024] N is the number of useful subcarriers;
[0025] The simplest channel estimation is obtained by dividing the available received signal by the previously known transmitted signal, and can continue to be optimized;
[0026] The second step, according to the mapping rules of the diversity copy of the current control frame, is as follows:
[0027]
[0028]
[0029] That is, each subcarrier transmits two bits of information, and if there are redundant subcarriers, the original bit information is sent repeatedly; the frequency domain data of each OFDM symbol is a complex value composed of I and Q channels, and the I channel corre...
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A kind of diversity copy reception performance optimization method provided by the present invention is a special method made by utilizing the maximum signal-to-noise ratio combined equalization method: re-integrate the channel vectors of the I-way and the Q-way to form a new channel matrix, and combine the I The received signals of the road and the Q road, the original bit information corresponding to these signals are the same, through the combined equalization matrix of the maximum signal-to-noise ratio of the deformation, it can be received based on the maximum signal-to-noise ratio of the bit level.
Description
technical field [0001] The invention relates to the communication technology in the electric power information collection system, in particular to the receiving performance optimization method under the special bit-level diversity copy in the frame control of the high-speed carrier communication system in the electric power information collection system. Background technique [0002] Usually, in an OFDM communication system, one or more bits of stream information are taken for constellation point mapping and placed on a certain subcarrier under different channels, that is to say, the modulation information of all the diversity constellation points is the same. However, the diversity transmission processing of the control frame in the power line communication system is quite special. The modulation information of each constellation point in the diversity set is different, and the I channel and the Q channel are respectively used as the processing unit; each OFDM symbol m of th...
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IPC IPC(8): H04L5/00H04L25/02H04L27/26
CPCH04L5/0007H04L25/0224H04L27/2647
Inventor 楼红伟刘琳童黄梅莹李正卫郭昌松
Owner SPL ELECTRONICS TECH CO LTD