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Receiving device, signal processing device and signal processing method

A technology of receiving equipment and receivers, applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., to achieve the effect of eliminating throughput and reducing the number of processes

Active Publication Date: 2018-01-19
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is to counteract the effect of the signal's strength and phase varying for each subcarrier (due to the effects of frequency selective phasing)

Method used

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  • Receiving device, signal processing device and signal processing method
  • Receiving device, signal processing device and signal processing method
  • Receiving device, signal processing device and signal processing method

Examples

Experimental program
Comparison scheme
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no. 1 approach

[0044] Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings. figure 1is a block diagram of the power line communication system 1000 according to the first embodiment of the present invention. In the power line communication system 1000 , a transmitting device 100 and a receiving device 200 are communicably coupled through a power line 10 .

[0045] First, the configuration of the transmitting device 100 is described. The transmitting device 100 includes a forward error correction (FEC) encoder 110, a modulator 120, an inverse fast Fourier transform (IFFT) unit 130, a cyclic prefix (CP) extension unit 140, a window function unit 150, and an analog front end (AFE) Unit 160.

[0046] The FEC encoder 110 applies an encoding process to TX data by using a preceding error correction code such as a convolutional code.

[0047] Modulator 120 applies modulation to the encoded TX data. Here, the modulator 120 performs...

no. 2 approach

[0075] The receiving device according to the second embodiment is designed to generate weighting factors by calculating the variance of the norm as a variation of the norm. Description is made below with reference to the accompanying drawings. Note that a description part of the configuration described in the first embodiment is omitted for clarity of the present invention.

[0076] Figure 4 is a block diagram of the demodulator 350 according to the second embodiment. In the demodulator 350 , a weighting factor generator 353 generates weighting factors based on the norm calculated in the norm calculator 252 . The weighting factor generator 353 includes a norm variance calculator 354 and a norm variance storage unit 355 .

[0077] The norm variance calculator 354 calculates the variance of the norm for each subcarrier output from the norm calculator 252 . if x k is the norm of the subcarrier signal in the kth symbol in a certain subcarrier, then the norm variance calculat...

no. 3 approach

[0090] In the second embodiment described above, the variance calculated based on the norm of each subcarrier is used as a weighting factor for weighting. Such as Figure 6 As shown in , this is because when the expected value of the norm μ is large enough relative to σ (ie, the SN is large enough), it can be approximated as μ 2 Signal power, σ 2 noise power.

[0091] However, when the expected value is close to σ (i.e., when no SN is achieved), σ 2 The approximation of the noise power does not have large deviations, while μ 2 The approximation of signal power is not true. Such as Figure 7 As shown in , this is because when the noise N is large, the ratio of elements of the phase that is folded beyond 180 degrees and added increases. Such contributions are not negligible, and therefore, there is a difference between the observed values ​​and the probability density function.

[0092] Therefore, the receiving device according to the third embodiment of the present inven...

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Abstract

Embodiments of the present invention generally relate to a receiving device, a signal processing device, and a signal processing method. Specifically, the receiving device according to the present invention includes: a receiver for receiving OFDM symbols modulated by phase shift keying; an FFT processor for applying FFT processing to the received OFDM symbols to obtain subcarrier signals; demapping A unit for demapping the subcarrier signal to generate a bit string; a norm calculator for calculating the norm of the subcarrier signal; a weighting factor generator for generating a weighting factor by taking statistics of the calculated norm; and A weighting unit is configured to weight the demapped bit string based on a specific weighting factor to obtain a soft decision value. Therefore, the receiving device can obtain soft decision values ​​to achieve good decoding performance with a smaller number of known signals and processes.

Description

[0001] Cross References to Related Applications [0002] The disclosure of Japanese Patent Application No. 2011-252262 filed on Nov. 18, 2011 including specification, drawings and abstract is hereby incorporated by reference in its entirety. technical field [0003] The invention relates to a receiving device for obtaining received data by receiving a signal modulated by phase shift keying. In particular, the present invention relates to a receiving device for obtaining received data by receiving OFDM symbols modulated by phase shift keying in power line communication over a power line. Background technique [0004] A technology has been developed for performing power line communication through the power line as a communication medium. In the next generation of power line communication, Orthogonal Frequency Division Multiplexing (OFDM) has been discussed as the main transmission scheme in terms of high-speed communication, anti-interference degree, and frequency utilizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B3/54
CPCH04L25/067H04L27/3809H04B3/542H04B3/46H04B3/54H04L27/265H04L27/2646
Inventor 柳泽洁稻川收
Owner RENESAS ELECTRONICS CORP
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