Please use this identifier to cite or link to this item:
標題: 跳頻編碼多工無線系統運用封包結合與干擾抵銷技術之效能分析
Performance Analysis of RS-Coded MFSK/FH-SSMASystems with Packet Combining and Interference Cancelling
作者: 曾釋瑾
Chin, Tseng Shih
關鍵字: Wireless Communication Systems;無線通訊系統;Frequency-Hopping Systems;跳頻通訊系統
出版社: 電機工程學系

With the advent of digital technologies, the wireless communication systems have been developed that can support high data rate and more sophisticated applica-tions. Over the last years, spread-spectrum multiple access (SSMA), also named as code-division multiple access (CDMA), has become a attractive technique in the wireless technologies. In an SSMA system, a lot of users can be allowed to share the same frequency band simultaneously and can achieve efficient bandwidth utilization. There are two basic types of SSMA techniques, namely direct-sequence SSMA (DS-SSMA) and frequency-hopping SSMA (FH-SSMA). In this thesis, we will focus on the FH-SSMA systems. FH-SSMA wireless communication systems have gained much interest recently because of its frequency diversity and resistance to the near-far problem. Cochannel interference (CCI) is one of the dominant factors which results in reduced user capacity. Various techniques used to resolve the CCI problem have been extensively investigated. In this thesis, we propose an improved iterative interference cancellation scheme to increase user capacity in the multilevel frequency-shift keying (MFSK)/FH-SSMA systems. The performance of systems with the proposed interfer-ence cancellers over Rayleigh fading channel are analyzed and compared with those of the conventional and other interference cancellers. In addition, a modified scheme for the RS-coded MFSK/FH system with packet combining is proposed to improve the system performance. The performance of the RS-coded MFSK/FH-SSMA system by combining the two different received copies of the same packet is analyzed. Er-rors-and-erasures correction decoding technique exploits the power of RS codes and improve the performance of the system that results from erasing unreliable symbols prior to decoding. Moreover, a modified scheme with reserved decoding is proposed to further improve the system performance.
Appears in Collections:電機工程學系所

Show full item record

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.