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Reception processing method and reception device

A technology of receiving device and processing method, which is applied in the direction of digital transmission system, error prevention, electrical components, etc., can solve problems such as easy deterioration of accuracy, and achieve the effect of improving error rate characteristics

Inactive Publication Date: 2010-12-08
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In the prior art described above, there is no consideration that there are subcarriers in the communication band (for example, subcarriers at the end of the communication band and its vicinity) that can be used to obtain propagation path estimation The number of pilot signals of the value is less than that of other subcarriers, and the accuracy of the obtained propagation path estimation value is more likely to deteriorate than that of other subcarriers

Method used

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  • Reception processing method and reception device
  • Reception processing method and reception device
  • Reception processing method and reception device

Examples

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no. 1 Embodiment approach

[0077] figure 1 It is a block diagram showing a configuration example of the OFDM receiver of the first embodiment.

[0078] Should figure 1 The shown OFDM receiver (hereinafter also simply referred to as "receiver") 10, for example, has a receiving antenna 11, a wireless unit 12, an ADC (Analog to Digital Converter, analog to digital converter) 13, a timing synchronization unit 14, an FFT (Fast Fourier Transformer, Fast Fourier Transformer) 15 , propagation path estimation unit 16 , propagation path compensation unit 17 , LLR calculation unit 18 , LLR correction unit 19 and error correction unit 20 . In addition, the OFDM receiver 10 can be applied to a receiving system of a wireless base station, and can also be applied to a receiving system of a wireless terminal (mobile station).

[0079] Among them, the reception antenna 11 receives signals (OFDM symbols) transmitted from an OFDM transmitter (not shown) via multi-carriers.

[0080]The radio unit 12 performs reception p...

no. 2 Embodiment approach

[0128] When the amount of multipath delay spread is large, the propagation path value variation between subcarriers is large, so the accuracy of the propagation path estimation value by extrapolation tends to deteriorate. Taking this into consideration, the LLR correction unit 19 may also adaptively change the M l , N l (1)~N l (M 1 ), M r , N r (1)~N r (M r ) (ie, the number of divisions of the extrapolation interval, the number of subcarriers included in the division interval).

[0129] Therefore, in the OFDM receiver 10 of this embodiment, for example, as Figure 7 As shown, a delay spread measuring section 21 is provided for measuring the amount of delay spread based on the propagation path estimation value obtained by the propagation path estimating section 16, and the LLR correcting section 19 uses the delay spread measuring section 21 As a result, the LLR weighting coefficients to be applied are adaptively controlled.

[0130] For example, when the delay spread...

Embodiment approach

[0146] In the OFDM receiver 10, when the signal-to-noise ratio (SNR: Signal to Noise Ratio) of the received signal is low, the accuracy of the propagation path estimation value varies over the entire communication frequency band compared with the case where the SNR is high. bad trend. In this case, LLR weighting may also not be performed.

[0147] Therefore, in the OFDM receiver 10 of this embodiment, for example, as Figure 10 As shown, it is preferable to provide an SNR measurement unit 22 for measuring the received SNR based on the propagation path estimation value obtained by the propagation path estimation unit 16, and based on the SNR measured by the SNR measurement unit 22, the LLR correction unit 19 Adaptively control the LLR weighting coefficients to be applied.

[0148] Figure 11 shows an example. in addition, Figure 11 (1) indicates that in the communication band, pilot signals are mapped every three subcarriers, and extrapolation is performed in the sections...

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Abstract

A reception device has the frequency outside the frequency band sandwiched between the highest frequency and the lowest frequency among the frequencies of subcarriers belonging to a first subcarrier group to which known signals are transmitted, respectively, performs a control of lowering the reliability of the signal after propagation path compensation for a first subcarrier belonging to a second subcarrier group to which the data signals to which propagation path compensation is applied on the basis of the known signals are transmitted, respectively than the reliability of the signal after propagation path compensation for a second subcarrier having the frequency inside the frequency band and belonging to the second subcarrier group, and corrects an error in the signal after the propagation path compensation for the first and second subcarriers.

Description

technical field [0001] The present invention relates to a receiving processing method and a receiving device. For example, the present invention can be used in multi-carrier communication such as OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and OFDMA (Orthogonal Frequency Division Multiplexing Access, Orthogonal Frequency Division Multiplexing Access). Background technique [0002] In wireless communication, a signal sent from a transmitter reaches a receiver through multiple propagation paths (multipath). Therefore, the signal observed by the receiver may be affected by multipath fading and become a waveform with a distorted amplitude or phase. One of means for correcting such distortion is coherent detection, which uses a pilot signal (also referred to as a reference signal), which is a known signal between a transmitter and a receiver. [0003] In a wireless communication system that performs coherent detection, a pilot s...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L1/00
CPCH04L27/2647
Inventor 小川大辅伊达木隆古川秀人杉谷敦彦江头直人
Owner FUJITSU LTD
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