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Inhomogeneous band overlapped OFDM (orthogonal frequency division multiplexing) communication method and system

A communication method and non-uniform technology, applied in transmission systems, wireless communications, digital transmission systems, etc., can solve the problems of inability to flexibly configure spectrum resources, increased difficulty in hardware implementation, and high computational complexity, reducing computational complexity and reducing Signal sampling rate to achieve the effect of asynchronous transmission

Inactive Publication Date: 2017-01-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The filter length used in this method is 1025, which makes the calculation complexity very high and increases the difficulty for hardware implementation.
[0004] The subcarrier spacing of the OFDM system is fixed, and spectrum resources cannot be flexibly allocated
The time-frequency resource allocation method of the OFDM system is as follows: the subcarrier interval in the frequency domain is fixed, and after the subcarrier interval is determined, the length of the time-domain symbol and the length of the CP (cyclic prefix) are basically determined. For the OFDM system, 5G The following flexible requirements cannot be done

Method used

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  • Inhomogeneous band overlapped OFDM (orthogonal frequency division multiplexing) communication method and system
  • Inhomogeneous band overlapped OFDM (orthogonal frequency division multiplexing) communication method and system
  • Inhomogeneous band overlapped OFDM (orthogonal frequency division multiplexing) communication method and system

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Embodiment

[0069] During the simulation, the signal is the transmission mode under the LTE standard 20MHz bandwidth, where the channel bandwidth is B=20MHz, the subcarrier spacing is Δf=15KHz, and the sampling rate of the signal is f s =30.72Mbps, regardless of the codec of the signal. Assuming that the entire bandwidth is divided into three subbands, the subcarrier spacing of each subband is: Δf 1 =15KHz, Δf 2 =30KHz, Δf 3 =60KHz, then the sampling points of the three sub-band Fourier transforms before downsampling are respectively: N 1 =2048,N 2 =1024,N 3 =512, according to the formula subband bandwidth formula B i =Δf i N RB Q i The bandwidth of the three sub-band signals can be obtained in order: B 1 =15×12×Q 1 =180Q 1 KHz, B 2 =30×12×Q 2 =360Q 2 KHz, B 3 =60×12×Q 3 =720Q 3 KHz, let Q 1 =37,Q 2 =18,Q 3 =9, the channel bandwidth of the three sub-bands can be obtained as B 1 =6.66MHz, B 2 = 6.48MHz, B 3 = 6.48MHz. The number of subcarriers transmitted in each su...

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Abstract

The invention discloses an inhomogeneous band overlapped OFDM (orthogonal frequency division multiplexing) communication method and an inhomogeneous band overlapped OFDM communication system, and belongs to the field of wireless communication. An emitting end can classify the whole channel bandwidth into multiple sub-bands according to different application scenes, and the sub-carrier wave interval and time domain symbol length of every sub-band are different. A high-speed code flow is changed to low-speed code flow through the sub-band classification, so as to reduce the signal sampling rate and improve spectral efficiency; meanwhile, the signal after OFDM modulation is filtered through a multi-phase multi-grade filter, and the calculation complexity is further reduced. A receiving end is performed with a series of converse treatment corresponding to the emitting end, thus the estimated sending data is obtained. The invention remains the advantages of OFDM and F-OFDM and overcomes shortcomings. The invention can realize the flexible configuration of bandwidth and achieve the asynchronous transmission of the signal.

Description

technical field [0001] The invention belongs to the field of wireless communication, and specifically relates to an OFDM (Orthogonal Frequency Division Multiplexing) communication technology with non-uniform sub-band superimposition. Background technique [0002] Since the birth of mobile communication, after more than 30 years of rapid development, it has become the basic information network connecting human society. It not only changes people's life style, but also promotes the development of national economy and improves the level of social informatization. With the fourth generation mobile communication system (4G) entering the commercial stage, the fifth generation mobile communication system (5G) has become a global research hotspot. In the future, the terminal capacity of the 5G communication network will reach more than tens of billions. Wearable smart terminals, massive Internet of Things terminals, Internet of Vehicles terminals, and terminals supporting D2D (Devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/18H04W28/20H04L5/00
CPCH04L5/0007H04W28/18H04W28/20
Inventor 刘光辉王艳艳孙铁成瞿辉洋易超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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