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OFDM receiver baseband processing method based on low-precision ADC and OFDM receiver baseband processing system based on low-precision ADC

A baseband processing, low-precision technology, applied in baseband systems, baseband system components, transmission systems, etc., can solve problems such as not considering the overall architecture design and system implementation of the receiver, and staying in the theoretical research and numerical simulation stages.

Active Publication Date: 2018-09-07
SOUTHEAST UNIV
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Problems solved by technology

However, the above solutions only stay at the stage of theoretical research and numerical simulation, and only focus on the statistical inference problem and the corresponding algorithm design and analysis, without considering the overall architecture design and system implementation of the receiver.

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  • OFDM receiver baseband processing method based on low-precision ADC and OFDM receiver baseband processing system based on low-precision ADC
  • OFDM receiver baseband processing method based on low-precision ADC and OFDM receiver baseband processing system based on low-precision ADC
  • OFDM receiver baseband processing method based on low-precision ADC and OFDM receiver baseband processing system based on low-precision ADC

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[0097] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0098] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein explain.

[0099] The invention provides a receiver baseband processing method and system for the OFDM system using a low-precision ADC at the receiving end. The considered OFDM system uses a total of N orthogonal subcarriers, where N d subcarriers are dedicated to data transmission, and the remaining N-N d su...

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Abstract

The invention provides an OFDM receiver baseband processing method based on a low-precision ADC and an OFDM receiver baseband processing system based on the low-precision ADC, wherein a received signal is converted into an analog baseband signal through down conversion and then divided into two paths, one path is subjected to quantification with high sampling rate and low precision (1-2 bits), frame synchronous search is realized through an autocorrelation method by designing a proper reference sequence according to an obtained low-precision sample value sequence, and a high-efficiency iterative algorithm is designed for realizing accurate estimation for composite channel gain corresponding to each subcarrier, thus, constellational symbol data transmitted on each subcarrier can be recovered; and the other path is subjected to quantification with low sampling rate and high precision, and noise power estimation and automatic gain control are realized through long-time time averaging. A receiving method and a receiver processing system provided by the invention can guarantee realization of high-reliability OFDM data transmission under the condition of using the ADC with ultralow precision of 1-2 bits.

Description

technical field [0001] The invention relates to a low-precision ADC-based OFDM receiver baseband processing method and system, belonging to the technical field of wireless communication. Background technique [0002] In a communication system, an analog-to-digital converter (ADC, Analog-to-Digital Converter) is often used to sample and quantize the down-converted analog baseband signal to obtain a digital baseband signal, so as to facilitate digital storage and baseband processing. In order to increase the communication rate by a thousand times, the future mobile communication system usually needs to use ultra-large bandwidth. At this time, the sampling frequency required by the ADC module is correspondingly increased. For example, the sampling frequency required by the ADC in the 5G system can be as high as several GS / s or even hundreds. GS / s. The power consumption of the ADC module can be approximately expressed as P ADC ∝2 b × f s , where b represents the ADC quantiza...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04W52/52H04J13/00
CPCH04J13/0062H04L25/0224H04L25/0256H04L27/2613H04L27/2656H04L27/2695H04W52/52
Inventor 金石王瀚庆温朝凯
Owner SOUTHEAST UNIV
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