Iterative receivers for an N frequency T users multiple acess channel with noise

Author(s)

Manish Sharma

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
• Defense date: 2010-09-23

Examining board members

Jaime Portugheis; Paul Jean Etienne Jeszensky; Getúlio Antero de Deus Júnior; Max Henrique Machado Costa; Reginaldo Palazzo Júnior

• Advisor: Jaime Portugheis

Abstract

The aim of this work is to analyze the performance of iterative joint reception and detection for multi-user channels. The analysis is centered around an N-frequency MFSK noisy channel shared by T users. Channel capacity values are obtained for joint and single user detection. Although the system's spectral efficiency is low, high rates at low signal to noise ratio are achievable by using a wide-bandwidth channel. The receiver is modeled as a factor graph and analyzed by its EXIT charts, which were also used to analyze the users' error correcting codes. Some systems are proposed and simulated to obtain the bit error probability. Results indicate that it is possible to transmit information with rates close to channel capacity. The proposed receiver and the performed analysis can be applied to other types of multiple access channels, in particular for systems with N orthogonal transmission symbols. (AU)

• FAPESP's process: 06/00330-7 - Iterative receivers for multiple access channels
• Grantee: Manish Sharma
• Support Opportunities: Scholarships in Brazil - Doctorate