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Digital encoder and method of encodinga

An encoder and encoding technology, which is applied in the field of encoders of encoding schemes (encoding), can solve problems such as unconvincing overhead, complexity, and impossibility

Active Publication Date: 2018-02-23
INST MINES TELECOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0057] As mentioned above, standard implementations are estimated to be up to 100 times more complex than OFDM, making it practically impossible to achieve
The above best prior art solutions still exhibit unconvincing overhead compared to OFDM while sacrificing some of the advantages of UF-OFDM over OFDM

Method used

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  • Digital encoder and method of encodinga
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  • Digital encoder and method of encodinga

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Embodiment Construction

[0128] In the context of this invention, the term UF-OFDM is intended to include all coding schemes in which:

[0129] - The input symbols to be transmitted are segmented into groups of subcarriers called subbands.

[0130] - Each sub-band is filtered individually.

[0131] More specifically, the frequency response of each individual filter may be centered at the center frequency of the corresponding subband so that the power of the secondary sidelobes of each subband can be attenuated.

[0132] For such a scheme, assuming that N is divisible by Q, K=N / Q, where K is a positive integer, and equation (1) becomes

[0133]

[0134] definition

[0135]

[0136] where x q (n) Inverse Fast Fourier Transform of size K corresponding to the number of subcarriers q for each of the K subbands.

[0137] On the basis of this observation, it follows that the fact that the IFFT of size K is a periodic function of K samples can be obtained by decomposing the first N samples of the ba...

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Abstract

An encoder architecture for UF-OFDM is provided, in which samples are first processed sub-band wise, and then resorted for sub-carrier-wise processing. The sub-carrier processing may comprise separateprocessing for the two extremity parts of the base band signal corresponding to the transient state of the UF-OFDM data stream and for a core part of the base band signal corresponding to the non-transient state of the UF-OFDM data stream, and then concatenated to obtain a UF-OFDM data stream. In certain embodiments a first extremity part of the base band signal corresponding to the transient state of the UF-OFDM data stream is calculated directly, and the other extremity part inferred from the core part and the first extremity part. The core and extremity part processors may be implemented with filters adapted to multiply each sample by a respective filter coefficient. Modifying these coefficients can introduce a frequency shift or convert the encoder for OFDM encoding.

Description

technical field [0001] The present invention relates to a digital encoder and encoding method, in particular to an encoder for multi-carrier waveform based encoding schemes such as Universal Filtered Orthogonal Frequency Division Multiplexing (UF-OFDM) encoding as defined below. Background technique [0002] With the rapid development of Internet applications, it is estimated that by 2020, the mobile traffic supported by the future communication network will be almost 500 times larger than the current one. In order to effectively deal with these constraints while maintaining a high level of user experience quality, for future 5th generation (5G) mobile communication systems, system capacity and user fairness should be greatly improved. [0003] Universal-filtered orthogonal frequency-division multiplexing (UF-OFDM, sometimes called universal-filtered multi-carrier) is the work of V.Vakilian, T.Wild, F.Schaich, S.ten Brink and J.F.Frigon in "Universal-filtered multi-carrierte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L27/20H04L27/26
CPCH04L1/0058H04L1/0071H04L1/0606H04L1/0668H04L27/2071H04L27/2695H04L27/26414H04L27/2628H04L27/26265H04L27/2607H04L27/2643
Inventor J·纳达尔C·阿卜杜勒努尔A·巴格达迪
Owner INST MINES TELECOM