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Non-orthogonal multi-carrier digital modulation and demodulation method and device

A technology of digital modulation and demodulation method, which is applied in the field of communication, can solve problems such as frequency offset sensitivity, and achieve the effect of low requirements, high spectrum utilization rate, and improved frequency band utilization rate

Inactive Publication Date: 2015-06-24
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0014] From the above analysis, it can be seen that OFDM has the characteristics of high spectrum utilization rate and strong anti-multipath ability, but OFDM requires subcarriers to be strictly orthogonal and sensitive to frequency offset.

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Embodiment Construction

[0070] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0071] Such as figure 2 , 3 , 4. A non-orthogonal multi-carrier digital modulation and demodulation device, comprising a sending module, a receiving module connected to the sending module through a wireless channel, and the sending module includes sequentially connected digital modulation processing units, D / A conversion device, power amplifier, and wireless transmitter, and the receiving module includes sequentially connected wireless receivers, preamplifiers, A / D converters, and digital demodulation processing units.

[0072] The wireless transmitter includes an up-conversion module and a transmission module. The up-conversion module is selected according to specific applications. The amplified analog signal is transferred to a frequency suitable for wireless channel...

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Abstract

The invention discloses a non-orthogonal multi-carrier digital modulation and demodulation method and device. The method includes the following steps that an available channel is divided into multiple sub carrier channels; source encoding, channel encoding, mapping, multi-carrier modulation and guard interval addition processing is performed on external input data to obtain a multi-carrier digital signal; the multi-carrier digital signal is converted into an analog signal which is then amplified and finally emitted into a wireless channel; the received signal is converted into an electric signal and amplified, and then the analog signal is converted into a digital received signal; through a parameter estimation algorithm, the digital received signal is estimated, so that the frequencies, amplitude values and phases of multiple carriers are obtained, and then demodulation is completed, and data are output. According to the method and device, the defect that carrier frequency deviation influences an OFDM orthogonal multi-carrier system and other orthogonal multi-carrier systems is overcome, the high utilization rate of a frequency spectrum can be achieved, and good resistance to Doppler is achieved.

Description

technical field [0001] The invention relates to the communication field, in particular to a non-orthogonal multi-carrier digital modulation and demodulation method and device. Background technique [0002] In wireless communication, limited channel bandwidth, signal multipath interference and Doppler frequency shift affect the development of wireless communication. In order to make full use of channel resources and improve the utilization rate of frequency band, Orthogonal Frequency Division Multiplexing (OFDM) is introduced in communication. [0003] The multi-carriers selected by OFDM technology are mutually orthogonal and the frequency spectrum overlaps. The orthogonality between multiple carriers (assuming the number is N) is described as follows: [0004] 1 T ∫ 0 T e jω i t · ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2627H04L27/2649
Inventor 杨萃郑尚镇胡诗玮曹燕韦岗宁更新
Owner SOUTH CHINA UNIV OF TECH
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