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Systems and methods for communicating using scma

A precoding and cascading technology, used in transmission systems, digital transmission systems, modulated carrier systems, etc.

Active Publication Date: 2020-09-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Multiple blocks will result in higher PAPR

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  • Systems and methods for communicating using scma
  • Systems and methods for communicating using scma
  • Systems and methods for communicating using scma

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Embodiment Construction

[0021] In general, the embodiments of the present disclosure provide methods and devices for communication using SCMA. For simplicity and clarity of illustration, reference numerals may be repeated among the figures to indicate corresponding or analogous elements. Numerous details are set forth to provide an understanding of the examples described herein. The examples may be practiced without these details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the examples. This description should not be taken as limiting the scope of the examples described herein.

[0022] In SCMA systems, binary data streams are directly encoded into multidimensional codewords. By directly encoding binary data into multi-dimensional codewords, the SCMA encoding technique described in this paper bypasses the QAM symbol mapping, thereby achieving a coding gain compared to conventional CDMA encoding. It is worth noting that...

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Abstract

Systems and methods for DFT-S-SCMA (Discrete Fourier Transform-Spread-Sparse Code Multiple Access) are provided. The input bits are encoded using a SCMA encoder. The output is precoded using IDFT (Inverse DFT) to produce a precoded SCMA block. At the input of the DFT, multiple precoded SCMA blocks are combined. This is performed in parallel for multiple sets of SCMA blocks at multiple DFTs. Then, the outputs of the DFTs are combined and OFDM modulated. This method can be used to increase the PAPR (Peak-to-Average Power Ratio) at the output of OFDM modulation.

Description

[0001] This application claims U.S. non-provisional application No. 15 / 204,468, filed July 7, 2016, entitled "System and Method for Communicating Using SCMA" (System and Method for Communicating Using SCMA) Interest, the entire contents of which are incorporated in this application by reference. technical field [0002] The present application relates to transmitters and methods for communicating using sparse code multiple access (SCMA). Background technique [0003] Some systems require and / or will benefit from low peak-to-average power ratio (PAPR) transmission. This is especially important for large-scale Internet of Things (IoT) applications, where the transmitters are machine type communications (MTC) transmitters that are cheap and do not have high power amplifier capabilities. [0004] SCMA provides good performance and flexibility for large-scale connections required for uplink license-free transmission suitable for large-scale IoT applications. SCMA offers a good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
CPCH04L5/0021H04L27/2636H04W4/70H04L5/0007
Inventor 默罕默德哈迪·巴里阿里瑞扎·白野斯特
Owner HUAWEI TECH CO LTD