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Digital front-end device and signal processing method

A digital front-end and signal receiving technology, applied in the field of digital front-end signal processing and digital front-end devices, can solve the problems of general and unclear application of OFDM systems, and achieve the effects of low cost, improved performance, and elimination of signal distortion

Inactive Publication Date: 2017-06-13
苏州维特比信息技术有限公司
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Problems solved by technology

The invention "Software Digital Front-End Signal Processing" with the application number CN2012800607884 provides another angle to solve the problem, that is, the signal after radio frequency processing is still allowed to have a considerable degree of signal distortion, but the baseband front-end processing is added between the radio frequency and the baseband unit to eliminate signal distortion, but the invention only discloses the execution of one or more specialized instructions on the processor to process the radio frequency output signal, which is too general and not clearly applicable to OFDM systems

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  • Digital front-end device and signal processing method

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Embodiment 1

[0022] Embodiment one, as attached figure 1 As shown, a digital front-end device applied to a receiver of an LTE system (a typical OFDM system) is provided to eliminate signal distortion caused by a radio frequency unit, including a received signal power measurement module, a DC component estimation and elimination module, and a residual frequency Offset cancellation module.

[0023] M101 Received Signal Power Measurement Module

[0024] The input data of this module is recorded as the data vector of the lth OFDM symbol in a wireless subframe on a certain receiving antenna, and all the received data on the wireless subframe are as follows.

[0025]

[0026] For the LTE system, in order to be backward compatible with the 3G system, the duration of each subframe is 1ms, and the OFDM symbols in one subframe are of unequal length. Indicates the number of OFDM symbols in a subframe, the number of sampling points in the data part of each OFDM symbol is the same, but the number...

Embodiment 2

[0044] Embodiment two, as attached figure 2 As shown, a digital front-end signal processing method applied to an OFDM system receiver is provided, including the following steps.

[0045] Step S101, in the time domain, measure the received signal power strength value.

[0046] After accumulating the power of the sampling points on each OFDM symbol within a subframe duration, the time domain signal output by the radio frequency unit is divided by the number of FFT points to obtain the average power value of the received signal of each OFDM symbol, and in a subframe The average value is recorded as the received signal power value (RSSI).

[0047] Step S201, in the time domain, estimate and eliminate the DC component of the received signal one by one according to the length of the OFDM symbol.

[0048] The signal of all sampling points on an OFDM symbol is first averaged, and the estimated DC component value is subtracted from the time domain signal at each sampling point.

[...

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Abstract

The invention relates to the field of digital mobile communication technology, and discloses a baseband front-end processing device for an LTE wireless communication receiver. The device comprises a module for measuring the received signal power value of a received radio frequency signal at the time domain, a module for gradually estimating and eliminating direct current components according to the OFDM symbol length, and a module for eliminating the residual frequency deviation of the signal of which the direct current components are eliminated. The method comprises the following steps: sending the signal that is subjected to digital front-end processing to a baseband unit, and meanwhile, enabling a radio frequency unit to adjust the power amplification coefficient of the next received signal according to the measurement result of the received signal power value. By adopting the digital front-end device disclosed by the invention, the signal distortion caused by radio frequency devices of the OFDM communication receiver can be effectively eliminated, the whole performance of the receiver can be increased, and relatively low implementation cost can also be achieved.

Description

technical field [0001] The invention relates to the technical field of digital mobile communication, in particular to a digital front-end device and a digital front-end signal processing method in a receiver in an OFDM digital mobile communication system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology, that is, Orthogonal Frequency Division Multiplexing technology is widely used in fourth-generation digital mobile communication systems, such as WIMAX and LTE systems. The main idea of ​​OFDM is: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel. The signal bandwidth on each subchannel is smaller than the relevant bandwidth of the channel, so each subchannel can be regarded as flat fading, thereby greatly eliminating intersymbol interference, and since the bandwidth of each subchannel is only a small...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04L27/26H04L25/06
Inventor 李文龙
Owner 苏州维特比信息技术有限公司
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