A data receiving method and a data receiving apparatus

Abstract

The invention discloses a data receiving method and a data receiving device. The method comprises the following steps: a receiver receives a communication signal sent by a sending end, and the communication signal is sent through a frequency domain diversity mode. The receiver divides the frequency bands of the received communication signals, performs channel estimation on the communication signals of the divided frequency bands, and calculates diversity weights of the respective frequency bands according to the channel estimation values of the respective frequency bands. The receiver uses thediversity weights of each frequency band to combine the maximum ratio of the communication signals of each frequency band. The invention calculates diversity weights of each frequency band accordingto channel estimation values of each frequency band. The calculated diversity weights of each frequency band vary with different channels, and the diversity weights of each frequency band are utilizedto combine the communication signals of each frequency band to obtain better diversity combining effect, thus effectively improving the system performance of the receiver under the premise of increasing very limited computational resources.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a data receiving method and a data receiving device. Background technique [0002] The channel in the power line carrier communication environment is a typical multipath fading channel, such as figure 1 As shown, the multipath frequency selective fading characteristics of the channel are very obvious. In the actual measured 30MHz bandwidth, the attenuation of high-frequency signals is 30dB higher than that of low-frequency signals, and the fading fluctuations of different frequency bands are also as high as 20dB. At the same time, the power line environmental noise is also an important restrictive factor affecting the quality of power line carrier communication. The noise on the power line can be divided into four types: steady background noise, narrowband interference noise, periodic pulse noise and burst noise. These noises appear in different positions of the po...

AI Technical Summary

Problems solved by technology

When the in-band signal amplitude fluctuates by 20dB or even 30dB, the characterization accuracy of fixed-point numbers with limited bit width to data with large attenuation is much lower than that of data with small attenuation; and too low quantization accuracy will lead to increased quantization noise, and because the channel The ups and downs come from multipath frequency selective fading, so at different frequency points, the quantization noise presents an irregular distribution characteristic that depends on the channel environment, that is, the frequency point with greater attenuation has higher quantization noise, which also makes the diversity of each frequency band Confidence in the data varies

[0011] After channel compensation, when the receiver in the existing broadband OFDM communication system combines the diversity data of each frequency band, it adopts an equalized ratio combination strategy, that is, the diversity data of each frequency band has the same weight, but, due to the diversity data of each frequency band There are differences in the confidence of diversity data, therefore, the existing channel compensation and diversity combining methods cannot achieve the optimal diversity combining effect

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