低信噪比下獨(dú)特碼檢測(cè)
THE DETECTION OF UNIQUE WORD AT LOWER SNR
-
摘要: 該文分析了時(shí)分多址(TDMA)通信系統(tǒng)中獨(dú)特碼(UW)的檢測(cè)和在低信噪比下獨(dú)特碼檢測(cè)器的設(shè)計(jì)。提出了一種基于最大似然準(zhǔn)則的通用的獨(dú)特碼檢測(cè)器的工程實(shí)現(xiàn)方案。仿真結(jié)果表明它的性能比傳統(tǒng)的硬判決-門限檢測(cè)方法在碼長為16和低信噪比條件下獲得大約3-4dB的改善。該文所研究的獨(dú)特碼檢測(cè)器已經(jīng)應(yīng)用于新近開發(fā)的通信系統(tǒng)中。Abstract: This paper describes the principles of Unique Word(UW) detection and the design methods for a UW-detector at lower SNR. An engineering solution for a general purpose UW-detector based on maximum likelihood criteria is proposed. The simulation results show a 3-4dB improvement over the often employed hard-decision/threshold detection when the length of UW is 16 and the SNR is low. The developed UW-detectors have been used in auther s recent communication systems.
-
INTELSAT, INTELSAT TDMA/DSI System Performance Specification, IESS-D317, 1997,TDMA/DDI Traffic Terminals.[2]J.L. Massey, Optimum frame synchronization, IEEE Trans. on Comm., 1972, 20(2), 115-119.[3]S. Sriram.[J].Maximum likelihood frame synchronizer for TDMA system, Proc. of IEEEGLOBECOMM98 Mini Conferences, Sydney, Australia.1998,:-[4]W.H. Sheen, C. T. Shih, On the performance evaluation, selection, and design of unique-wordsfor TDMA system, IEEE Trans. on Vehicular Technology, 1995, 44(1), 111-I20.[5]J.G. Proakis, Digital Communications, Third Edition, New York, McGraw-Hill, 1995, Chapter5. -
計(jì)量
- 文章訪問數(shù): 2025
- HTML全文瀏覽量: 121
- PDF下載量: 587
- 被引次數(shù): 0
下載:
