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Frame synchronization detection apparatus and receiving apparatus

A detection device and receiving device technology, applied in the directions of synchronization devices, electrical components, multi-frequency code systems, etc., can solve the problems of frame number detection failure, carrier frequency deviation, inability to accurately detect frame numbers, etc. Effect

Active Publication Date: 2014-04-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, when a received signal is converted into a signal of an intermediate frequency band, a carrier frequency deviation due to its conversion error occurs
In this case, when the PN sequence in the received signal is greatly distorted due to the influence of the carrier frequency deviation, the frame number detection device disclosed in Patent Document 1 cannot accurately calculate the cross-correlation result, and the detection of the frame number fails.
[0013] In addition, there are cases where a carrier frequency deviation due to an error in the local oscillation frequency used in the receiver or the Doppler effect occurs
In this case, when the PN sequence in the received signal is greatly distorted, the frame number cannot be accurately detected

Method used

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  • Frame synchronization detection apparatus and receiving apparatus
  • Frame synchronization detection apparatus and receiving apparatus
  • Frame synchronization detection apparatus and receiving apparatus

Examples

Experimental program
Comparison scheme
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Embodiment approach 1

[0037] figure 1 It is a diagram schematically showing a configuration example of the receiving device 1 according to Embodiment 1 of the present invention. like figure 1 As shown, the receiving device 1 has a receiving antenna element Rx, an analog signal processing unit 11, an A / D converter (ADC) 12, a quadrature demodulation unit 13, a local oscillator 14, an SRRC (Squared-Root Raised Cosine, square root Raised cosine) filter 15, PN removal unit 16, equalization processing unit 17, frame body processing unit 21, channel response estimation unit 22, local PN sequence generation unit 24, multiplier 25, and a frame functioning as a frame synchronization detection device Synchronization detection unit 26 .

[0038] The analog signal processing unit 11 receives wireless signals through the receiving antenna element Rx. The analog signal processing unit 11 performs signal amplitude adjustment, frequency conversion, and band limitation on the wireless signal, and supplies an ana...

Embodiment approach 2

[0074] Next, Embodiment 2 of the present invention will be described. Figure 12 It is a functional block diagram schematically showing the configuration of the frame synchronization detection unit 26B according to the second embodiment. In addition to substitute figure 1 shows the frame sync detection section 26 which has Figure 12 Except for the frame synchronization detection unit 26B, the structure of the reception device of this embodiment is similar to figure 1 The illustrated receiving device 1 has the same structure.

[0075] like Figure 12 As shown, the frame synchronization detection unit 26B includes the first delay unit 31 , the autocorrelation calculation unit 33 , and the frame number detection unit 35 similarly to the frame synchronization detection unit 26 of the first embodiment. The frame synchronization detection unit 26B of the present embodiment further includes a signal delay unit 36 ​​, a signal synthesis unit 30 , and a frame timing detection unit...

Embodiment approach 3

[0095] Next, Embodiment 3 of the present invention will be described. Figure 14 It is a functional block diagram schematically showing the configuration of the frame synchronization detection unit 26C according to the third embodiment. In addition to substitute figure 1 shows the frame sync detection section 26 which has Figure 14 Except for the frame synchronization detection unit 26C, the structure of the reception device of this embodiment is similar to that of figure 1 The illustrated receiving device 1 has the same structure.

[0096] like Figure 14 As shown, the frame synchronization detection unit 26C includes the first delay unit 31 , the autocorrelation calculation unit 33 , the second delay unit 32 , and the frame timing detection unit 34 similarly to the frame synchronization detection unit 26 of the first embodiment. The frame synchronization detection unit 26C of the present embodiment further includes a sub delay unit 38 , a sub autocorrelation calculation...

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Abstract

The invention provides a frame synchronization detection apparatus and a receiving apparatus, and signal frame can be detected accurately even if the received signal lacks fidelity because of influence of carrier frequency deviation. A frame synchronization detection part (26) included in the receiving apparatus comprises a first delay part (31) that outputs a delayed signal r(t-T1) by delaying 1 frame to a received signal r(t); an autocorrelation computing unit (33) that computes an autocorrelation feature between a known signal sequence included in the received signal r(t) and a delayed known signal sequence included in the delayed signal r(t-T1), and generates a plurality of autocorrelation values corresponding to the plurality of frames; and a frame number detection part (35) that detects a peak value in the autocorrelation values and determines the frame number of the frame corresponding to the peak value.

Description

technical field [0001] The present invention relates to a frame synchronization technique for detecting each frame in a received signal composed of a plurality of consecutive frames in time. Background technique [0002] In recent years, as a modulation method for transmitting digital signals, a multicarrier method that transmits information using multiple subcarriers (subcarriers) with different frequencies and a single carrier method that transmits information using only a single carrier have been adopted. . [0003] An example of the multi-carrier system is an Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) system using a plurality of subcarriers in a mutually orthogonal relationship in a transmission frequency band. The OFDM method is a method in which a data symbol is assigned to each subcarrier, one or both of the amplitude and phase of the subcarrier is digitally modulated by the data symbol, and a plurality of digitally ...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04L27/26
Inventor 门田行广
Owner MITSUBISHI ELECTRIC CORP