Multiple-input multiple-output (MIMO) is a well-known technique for efficiently increasing bandwidth utilization. However, the implementation of the MIMO receiver with a reasonable hardware cost is a big challenge. Most MIMO receivers exploit minimum mean-square error (MMSE), zero-forcing (ZF) and maximum-likelihood (ML) to detect MIMO signals. Among the detectors, the ZF detector is simple detector with low computational complexity, but lower performance compared to ML decoder, which has huge computational complexity. If the K-Best sphere decoding algorithm (SDA) is adopted, the system complexity can be substantially reduced and the performance can approach that of the ML scheme when the value K is sufficiently large. In this paper, a hard-output MIMO detector is implemented using the K-Best SDA for 4¡Ñ4 64-quadrature amplitude modulation (QAM) MIMO detection. The implementation is realized by using a 0.18-£gm CMOS technology. The implementation chip core area is 3.35mm2 with 229K gates, and the decoding throughput is up to 3.12Mb/s with a 25MHz clock rate.

No description available.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

This dissertation is concerned with the impact online news readers comments have on the role of journalists and the implication it carries in shifting private sentiments onto a public space. Online news readers comments have recently grown in popularity and journalists across the United States are divided on how best to host this new public space. Drawing perspectives from new forms of journalism, sociological studies in race and gender, critical race and feminist studies, this dissertation focuses on a) the challenges of news organizations as hosts of this new public space and b) the racist and sexist discourse generated by audiences of certain online news stories. This dissertation employs a multi-method research design that combines a large scale survey of journalists in the United States, in-depth interviews with journalists, content analysis and a discourse analysis of online news readers comments from five selected news stories with strong race and/or gender elements in order to 1) gain journalists’ perspectives in this new electronic landscape and 2) examine the content of the comments that pose the most challenges to journalists in terms of hosting this space. The survey and interviews revealed how journalists are divided in wanting to serve their public by providing a space for dialogue but yet refusing to host hate. Faced with this challenge within the new electronic landscape, a majority of journalists are left on their own to determine how best to handle this new public space with hardly any guidance or support from news managers. The analysis of the comments showed that the articulations of race and gender in the discourse were not erratic expressions of a minority but instead repertories of racism and sexism that mirrored the string of findings from race and gender scholars. This dissertation finds that online news readers comments section have emerged as the space for unconstrained expressions to flourish without the constraints of political correctness and within the safe confines of anonymity. / text

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No description available.

Jürgen Habermas is widely considered one of the most influential living philosophers and social theorists, whose work has spanned sixty years of academic writing. In the wake of the attacks of September 11, 2001, he began to engage more explicitly with questions of religion in his work, helping to popularize the term “post-secularism,” and offered leading analysis on the problem of religion in the public sphere, expanding and innovating John Rawls’s idea of the “public use of reason.” While this shift in Habermas’s work is significant, he has long been interested in questions relating to religion, dating back to his doctoral dissertation in 1954. To date, very few scholars have traced the idea of religion in Habermas’s work as a whole, and none have developed an analysis of how his conception of religion changes in relation to shifts in his broader theoretical ideas, and to significant changes in politics, such as the collapse of the Soviet Union and the aftermath of the 9/11 attacks. My dissertation thus offers the first English-language critical investigation of the social construction of Habermas’s theory of religion. More specifically, I provide a critique of his theory based on ideas generated within the critical study of religions, and revisit the controversy between “deconstruction” and “rational reconstruction” in contemporary critical theory. Ultimately, I aim to expand Habermas’s model of reason and rationality to include elements of myth, ritual, and symbols, along with their various iterations in contexts of interaction, and as they are expressed in cultural narratives about religion within the public sphere.

No description available.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. Description based on print version record. Includes bibliographical references.

The relentless political pressure the Ethiopian government put on Ethiopian journalists, political dissidents and opposition activists drove hundreds of them out of their country. However, after leaving their country, the journalists and the opposition activists remain engaged in the politics of their country of origin through the media outlets they establish in diaspora. Ethiopian Satellite Television (ESAT) and Oromia Media Network (OMN) are two media platforms that have emerged in the United States under such conditions. This dissertation chronicles the rise of ESAT and OMN and their far reaching political influence in Ethiopia. Using mixed method research, it provides their detailed profiles that range from their inception, to their impact on the Ethiopian public sphere and the Ethiopian government’s response to them, to their reporting of political events in Ethiopia. This research makes the case that ESAT and OMN, through the instrumentality of a transnational public sphere have altered the Ethiopian political dynamics during the last five years. Particularly, ESAT and OMN use Facebook and Twitter as a backbone to gather information and foster relationships with news sources inside Ethiopia; they also transmit uncensored information back to Ethiopia via satellite television. In response to their communication activities, the Ethiopian government seeks to undermine the links that ESAT and OMN have in the country by routinely blocking the internet, requesting Facebook and Twitter to take down their content and jamming their satellite transmissions. The Ethiopian government also responds to the reporting of ESAT and OMN by changing its policy positions on domestic political issues. This illustrates that Ethiopian political exiles remain key players of Ethiopian political dynamics in ways that thoroughly exemplify trans-local reciprocity. It also shows that ESAT and OMN might very well be a prototype of a diaspora community media that keeps grievances alive and magnifies ideological differences they brought with them to the United States. / 2021-01-11