Space-Time coding using Multilevel Delay Processor

• Main Authors: CHIU CHIA YUNG, 邱佳永
• Other Authors: 林茂昭
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/83825650299379446569

碩士 === 國立臺灣大學 === 電信工程學研究所 === 90 === Transmit diversity techniques have been shown to be able to effectively combat fading and increase the channel capacity in wireless communications. It is also known that a trellis code with multilevel coding scheme can provide a large free distance. In this thesis, we proposed a space-time code scheme with a multilevel delay processor. In chapter 2, we briefly review the structure of the multilevel delay processor with a signal mapper, which it can provide a large free distance. We also review the space-time trellis code with its encoding scheme and design criterion for slow and fast fading channels. In chapter 3, two delay processor schemes were implementing with the space-time trellis code under slow fading channel. Here we use the Viterbi decoder, MAP decoder and SOVA decoder. Also we give the simulation results in this chapter. In chapter 4, we consider the proposed scheme under fast fading channel. We also consider a simple random signal mapping, which was proposed by Georghiades. The advantage of the proposed scheme is demonstrated by simulation.