BER PERFORMANCE OF GOLDEN CODED MIMO-OFDM SYSTEM OVER RAYLEIGH AND RICIAN FADING CHANNELS
Published In: INTERNATIONAL CONFERENCE ON PERVASIVE COMPUTING AND COMMUNICATION
Author(s): A VAMSI KRISHNA , G DHRUVA , V SAI KRISHNA , V SINHA
Abstract: In this paper, we analyze the Bit Error Rate (BER) performance of Golden coded Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system over Rician multipath fading channel. We also compare the performance of the MIMO-OFDM system using Golden code in Rayleigh and Rician multipath fading channels. We discuss the effects of the presence of line-of-sight (LoS) component in the multipath fading environment which renders the improvement in the overall performance of the Golden coded MIMO-OFDM. This paper discusses the performance of Golden codes in a frequency selective Rician fading channel. To deal with the frequency selective fading channel, we use the OFDM (Orthogonal Frequency Division Multiplexing) modulation. The BER performance of the Golden coded MIMO-OFDM system under several propagation conditions has been evaluated
- Publication Date: 17-Jun-2012
- DOI: 10.15224/978-981-07-2579-2-165
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IMPACT OF WEB QUERY MORPHOLOGY AND AMBIGUITY ON SEARCH ENGINE’S PERFORMANCE
Published In: INTERNATIONAL CONFERENCE ON PERVASIVE COMPUTING AND COMMUNICATION
Author(s): ANAND P. DWIVEDI , ARTI MISHRA , SANJAY K. DWIVEDI , V.K. PATHAK
Abstract: The effectiveness of Internet search engines are often hampered by the deficiencies in user queries and the reluctance or inability of users to build less ambiguous multiword queries. This is mainly because of the language morphologies and word ambiguities. Neither simple query expansion techniques nor enhanced indexing mechanisms have been satisfactory in addressing these problems, because these methods do not consider the user context or knowledge of the problem domain. This paper covers the comprehensive analysis of web queries in English to know the impact of morphology (especially root word) and ambiguity on the Google search engine. We have used different query sets to test each of these aspects. Our results show that the search engines normally find themselves incompetent to understand and resolve these issues on behalf of user. Therefore, the mean average precision of Google search engine has reduced in case of the query set having any type of ambiguities as compared to the oth
- Publication Date: 17-Jun-2012
- DOI: 10.15224/978-981-07-2579-2-169
- Views: 0
- Downloads: 0