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Cyclic shifting-based method for estimating shifting number and channel response in orthogonal frequency division multiplexing (OFDM) system

A technology for channel response and phase estimation, applied in multi-frequency code systems, baseband system components, etc., to achieve the effects of improving effectiveness, ensuring reliability, and reducing computational complexity

Active Publication Date: 2013-02-13
ANSHAN ZHUOYUE GUANGWEI TECH CO LTD
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Problems solved by technology

[0015] The technical problem to be solved by the present invention is to propose a pilot design method to improve the traditional PTS to suppress PAPR based on the time-domain cyclic shift PTS in view of the defects of high computational complexity and high system bit error rate in the existing PAPR reduction technology. insufficient

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  • Cyclic shifting-based method for estimating shifting number and channel response in orthogonal frequency division multiplexing (OFDM) system
  • Cyclic shifting-based method for estimating shifting number and channel response in orthogonal frequency division multiplexing (OFDM) system
  • Cyclic shifting-based method for estimating shifting number and channel response in orthogonal frequency division multiplexing (OFDM) system

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Embodiment Construction

[0029] OFDM system model under multipath channel, such as figure 1 As shown, the signal source at the sending end modulates binary information into QAM symbols through QAM modulation, then performs IFFT transformation, inserts cyclic prefix, parallel-to-serial conversion, and D / A conversion, and finally sends out the generated OFDM time-domain signal. At the receiving end, the inverse process of the sending end is performed on the received information to estimate the original information. The present invention inserts response pilots on the basis of partial transmission sequences based on time domain cyclic shift. Figure 4 Shown is the implementation process block diagram of the present invention, specifically comprises the following steps:

[0030] 1. Determine the position of the pilot used to estimate the phase rotation (the second type of pilot) in the input OFDM symbol, and insert the pilots used for channel estimation (the first type of pilot) at equal intervals after ...

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Abstract

The invention relates to a cyclic shifting-based method for estimating shifting number and channel response in an orthogonal frequency division multiplexing (OFDM) system. The technical scheme is as follows: a PTS processing method based on time domain cyclic shifting is adopted to reduce the peak average power ratio (PAPR) of an OFMD symbol in an OFDM system model, and then a pilot frequency inserted method for estimating the cyclic shifting number of a sequence and the response of a transmission channel is provided. According to the method, the PAPR of the system is reduced while the sending of edge information is avoided, and a receiving end can estimate the cyclic shifting number of each sub-sequence in a time domain by using a small amount of pilot frequency information without using complex blind estimating, so that phase position rotating factors which are multiplied by each symbol in a frequency domain can be calculated, and the reliability and the effectiveness of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to reduction of peak-to-average power ratio (PAPR) and pilot design in an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] The concept of OFDM technology first appeared in the mid-1950s. In the 1960s, people conducted a lot of theoretical research on multi-carrier modulation technology, forming the idea of ​​parallel data transmission and frequency division multiplexing (FDM), which made OFDM technology firstly applied in the US military high-frequency communication system. Using Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) to realize baseband modulation and demodulation greatly reduces the complexity of the multi-carrier system. In 1985, Cimim introduced the concept of OFDM into cellular mobile communication system for the first time, which laid the foundation for the development of wireless OFDM...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 龙恳王毅富越刘巧范小川王香榆陈前斌
Owner ANSHAN ZHUOYUE GUANGWEI TECH CO LTD
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