Method and device for generating orthogonal multi-subband transmission waveforms
A technology for transmitting waveforms and generating devices, applied in the direction of multi-frequency code systems, etc., can solve the problems of reducing spectrum utilization efficiency, complex control, large storage space, etc., and achieve good power peak-to-average ratio and anti-frequency domain selective interference performance, Improve spectral efficiency and save storage space
Active Publication Date: 2013-01-30
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0007] It can be seen that the existing time-domain filtering method adopts the method of copying and adding, which requires a large storage space and more complicated control, especially when there are many sub-band filter coefficients.
[0008] figure 1 Just one subband case, but from figure 1 It can also be seen that the frequency domain response of the time-domain filter waveform has a transition band. When multiple sub-bands are mapped to the system bandwidth, in order to ensure that each sub-band remains orthogonal, a transition band is required between each sub-band , the existence of the transition band reduces the spectrum utilization efficiency
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[0043] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.
[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.
[0045] The first embodiment of the present invention relates to a method for generating orthogonal multi-subband transmission waveforms, the flow of which is as follows figure 2 shown.
[0046] In step 201, the data in the same data stream is divided into M channels, where M is an integer greater than 1, that is, the M channels of data belong to...
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The invention relates to the field of wireless communication, and discloses a method and a device for generating orthogonal multi-subband transmission waveforms. By carrying out sinc filter for each path of data at a time domain to generate the orthogonal multi-subband transmission waveforms, the method and the device avoid the introduction of a protective band and improve the spectrum efficiency compared with the time domain filter mode in the prior art. The distance between a maximum point and a first zero crossing point of a sinc function is 1 / subband bandwidth, and a sampling interval is 1 / system bandwidth. By carrying out circular extension for the data, then carrying out time domain sinc filter and outputting an assigned part in the sinc filter result as an effective filter result, the required storage space is smaller, and the control is simpler.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to the generation technology of orthogonal multi-subband transmission waveforms. Background technique [0002] In order to efficiently transmit data on the air interface, there is a way to divide the entire frequency band into several sub-bands that are usually orthogonal to each other, and transmit one channel of data in each sub-band. A data block usually includes a plurality of data information and is protected with a cyclic prefix (CyclicPrefix, "CP" for short). [0003] In order to perform subband transmission, it is necessary to generate subband waveforms according to the data to be transmitted. There are two ways to generate sub-band waveforms, frequency domain and time domain. The implementation of the frequency domain is based on the Fast Fourier Transform (FFT for short) / Inverse Fast Fourier Transform (IFFT for short) transformation pair, that is, the data block is ...
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IPC IPC(8): H04L27/26
Inventor 张小东简相超陈垚吴涛
Owner SPREADTRUM COMM (SHANGHAI) CO LTD