Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

As a special case of sparse code multiple access (SCMA), low-density signatures based code-division multiple access (LDS-CDMA) was widely believed to have worse error rate performance compared to SCMA. With the aid of Eisenstein numbers, we present a novel class of LDS which can achieve error rate performances comparable to that of SCMA in Rayleigh fading channels and better performances in Gaussian channels. This is achieved by designing power-imbalanced LDS such that variation of user powers can be seen both in every chip window and the entire sequence window. As LDS-CDMA is more flexible in terms of its backwards compatibility, our proposed LDS are a promising sequence candidate for dynamic machine-type networks serving a wide range of communication devices

Design of Power-Imbalanced SCMA Codebook

Sparse code multiple access (SCMA) is a promising multiuser communication technique for the enabling of future massive machine-type networks. Unlike existing codebook design schemes assuming uniform power allocation, we present a novel class of SCMA codebooks which display power imbalance among different users for downlink transmission. Based on the Star-QAM mother constellation structure and with the aid of genetic algorithm, we optimize the minimum Euclidean distance (MED) and the minimum product distance (MPD) of the proposed codebooks. Numerical simulation results show that our proposed codebooks lead to significantly improved error rate performances over Gaussian channels and Rayleigh fading channels

Constructing Religion in the Digital Age: The Internet and Modern Mormon Identities

This dissertation explores the discursive construction of identity among members of the Church of Jesus Christ of Latter-day Saints (LDS or Mormons) in the digital age. Religious identity emerges at the intersection of multiple and often conflicting voices with varying amounts of normative power to speak for and about the group. The polyphony of the internet during this digital age makes it increasingly difficult to identify the boundaries of acceptable belonging within religious groups, particularly traditionally firmly-bounded and authoritarian ones such as the LDS Church, in part because the internet itself provides an unprecedented platform for conflicts and discourses that shift these boundaries. Particularly during the “Mormon moment” in 2012-2013, as media and the public scrutinized the LDS Church, mediated platforms gave voice to competing narratives that challenged traditional notions of what it means to be Mormon. Employing participant observation, in-depth interviews, and discourse analysis, this dissertation uses a case study approach to consider the ways that modern Mormon identities emerge dialogically from multiple, often conflicting sources: normative authorities, faithful members, the secular media, and heterodox and former Mormons. This multi-vocal rendering is a negotiation of structural and agential processes often emerging from internecine conflicts on the internet, and resulting in pressure on the institution to accommodate new forms of Mormon life. In particular, nuanced, highly visible, and wide-ranging communities of heterodox Mormons extend unprecedented challenges to traditional understandings of authority in the LDS context, dismantling views of Mormons as monolithic and providing a window into processes of institutional change

Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

As a special case of sparse code multiple access (SCMA), low-density signatures based code-division multiple access (LDS-CDMA) was widely believed to have worse error rate performance compared to SCMA. With the aid of Eisenstein numbers, we present a novel class of LDS which can achieve error rate performances comparable to that of SCMA in Rayleigh fading channels and better performances in Gaussian channels. This is achieved by designing power-imbalanced LDS such that variation of user powers can be seen both in every chip window and the entire sequence window. As LDS-CDMA is more flexible in terms of its backwards compatibility, our proposed LDS are a promising sequence candidate for dynamic machine-type networks serving a wide range of communication devices

Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

As a special case of sparse code multiple access (SCMA), low-density signatures based code-division multiple access (LDS-CDMA) was widely believed to have worse error rate performance compared to SCMA. With the aid of Eisenstein numbers, we present a novel class of LDS which can achieve error rate performances comparable to that of SCMA in Rayleigh fading channels and better performances in Gaussian channels. This is achieved by designing power-imbalanced LDS such that variation of user powers can be seen both in every chip window and the entire sequence window. As LDS-CDMA is more flexible in terms of its backwards compatibility, our proposed LDS are a promising sequence candidate for dynamic machine-type networks serving a wide range of communication devices