Multi-resolution 64-DAPSK modulation in a hierarchical COFDM transmission system

被引：4
|
作者：
Engels, V [1 ]
Rohling, H [1 ]
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, D-38092 Braunschweig, Germany
来源：
IEEE TRANSACTIONS ON BROADCASTING | 1998年 / 44卷 / 01期
关键词：
D O I：
10.1109/11.713064
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The two alternative modulation schemes of 64-QAM (quadrature amplitude modulation) and 64-DAPSK (differential amplitude and phase shift keying) with a coherent and incoherent demodulation have been proposed for digital terrestrial video broadcasting (DTVB) in combination with the Coded Orthogonal Frequency Division Multiplexing (COFDM) technique [2, 3]. Additionally, a hierarchical transmission system based on a multi-resolution (MR) 64-QAM is described in [2] which extends the service area of a TV programme in decoding a stepwise reduced data rate with an increasing transmitter distance (graceful degradation). This procedure corresponds with a decreasing of picture quality. In this paper MR concepts for the 64-DAPSK - which is rather new - are developed. A performance comparison between the hierarchical transmission systems (MR-64-QAM/OFDM and MR-64-DAPSK/OFDM) is described for the uncoded and coded case.
引用
收藏
页码：139 / 149
页数：11
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