Methods and apparatus for construction of SCMA codebooks

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United States of America Patent

PATENT NO 10263660
APP PUB NO 20180048349A1
SERIAL NO

15588431

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Disclosed are methods and apparatus used in wireless communications. The methods and apparatus establish a codebook for use in sparse code multiple access (SCMA) encoded communications, in particular. The SCMA codebook is configured to set the codebook for at least one layer (i.e., a user) to include a constellation of points having a first grouping of constellation points located at first radial distance from an origin in a complex plane and a second grouping of constellation points located at a second radial distance from the origin. This codebook arrangement provides increased gains at receivers by optimizing the constellation shape to improve the distance between constellation points (i.e., SCMA codebook performance), and in particular more robust performance when encountering amplitude and phase misalignment in uplink (UL) multiple access.

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Patent Owner(s)

  • QUALCOMM INCORPORATED

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bhushan, Naga San Diego, US 710 15680
Ji, Tingfang San Diego, US 1230 17955
Sun, Haitong San Diego, US 845 1186

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