Massive Machine Type Communications by Fanggang Wang & Guoyu Ma

Author:Fanggang Wang & Guoyu Ma
Language: eng
Format: epub
ISBN: 9783030135744
Publisher: Springer International Publishing

In TSNDMA, the channel coded bits of user k who is active are denoted as . Then the bit vector d k is divided into m segments as for . If is not an integer, then some extra bits are appended so that each segment has the size where is the ceiling function. After data segmentation, PLNC encoding is implemented by adding all the m bit vectors in modulo 2 to generate the redundancy segment as

(5.1)

where n = m + 1 and is the bit vector of the redundancy segment. After PLNC encoding, b m bits of the k-th user at segment i for are modulated to the data symbols as . Similar to the aforementioned CSMUD, the augment alphabet which contains the modulation alphabet and zero symbol is utilized to denote the active and inactive users. Then the modulated symbol vectors in all n segments are spread by an specific spreading sequence from the tandem spreading combination Ωk, which is written as

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