An Approximation Method of the Continuous Phase Encoder in the Concatenated Coded GMSK System

作者：Jing, Zhenhai^*; Bai, Baoming

来源：6th International Conference on Wireless Communications, Networking and Mobile Computing (WICOM), Chengdu, PEOPLES R CHINA, 2010-09-23 To 2010-09-25.

• GMSK
• continuous-phase encoder (CPE)
• iterative decoding
• upper boun

In this paper, a reduced-complexity continuous-phase encoder (CPE) in the concatenated coded GMSK system, called linearly approximated CPE (LA-CPE) is presented. We show that the LA-CPE can be completely modeled as a trellis diagram with less state number than traditional CPE. Therefore, the benefit to use LA-CPE in concatenated GMSK systems is simple in design and convenient for performance analysis. As an example, serial concatenation of a convolutional code and a GMSK system is investigated. The results show that the performance of the concatenated approximated GMSK system with the LA-CPE is close to the performance of the concatenated exact GMSK system with the traditional CPE, which illuminates that LA-CPE is an effective approximation to traditional CPE. Moreover, the performance upper bound of a concatenated GMSK system with LA-CPE is easily derived in this paper while the traditional CPE is difficult to analyze the performance of concatenated GMSK system. The resulting bound is in accordance with the simulation results. Furthermore, this approach can readily be extended to the general CPM system.

• 出版日期2010
• 单位西安电子科技大学; 综合业务网理论及关键技术国家重点实验室; 中国电子科技集团公司第三十六研究所