| 基于DTMB-A系统的高效频分多业务 |
郝博,王军( ),王昭诚 |
| Efficient frequency division multi-service based on DTMB-A systems |
| Bo HAO,Jun WANG(),Zhaocheng WANG |
| Tsinghua University & National Engineering Laboratory for Digital TV (Beijing), Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Electronic Engineering, Tsinghua University, Beijing 100084, China |
摘要:
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| 文章导读 | |||
| 摘要基于中国下一代数字地面多媒体广播(DTMB-A)协议,面向广播通信领域提高数据率和支持移动性的发展趋势,该文提出一种高效频分多业务的设计方案,并给出了收发机的结构框图。其中,固定业务通过32×1 024快速Fourier变换(FFT)及256阶正交幅度调制(QAM)为固定接收用户提供高速率的高清节目; 移动业务则采用偏置正交幅度调制(OQAM)和时频域内均具有良好衰减特性的各向同性正交变换算法(IOTA)作为成型滤波器,并通过最大化传输容量来确定不同移动接收环境下合适的FFT大小。仿真表明: 所提方案可使移动业务对固定业务的带外干扰降低20 dB, 同时改善了Doppler环境下系统的接收性能,更好地满足了移动用户的需求。 | |||
| 关键词 ：频分多业务,DTMB-A,偏置正交幅度调制(OQAM),各向同性正交变换算法(IOTA) | |||
| Abstract：An efficient frequency division multi-service allocation is designed to provide high data rates and mobile support for broadcasting communication. The transceiver structure design is based on advanced digital terrestrial multimedia broadcasting (DTMB-A). The fixed service uses a 32 × 1024 fast Fourier transform (FFT) and 256 quadrature amplitude modulation (QAM) to provide the static receivers with high definition programs, while the mobile service is flexibly configured according to the channel characteristics with offset-QAM modulation and the isotropic orthogonal transfer algorithm (IOTA) as the shaping filter. Simulations show 20 dB gain for the out-of-band interference for the fixed service and better performance in the Doppler environment. As a result, this method simultaneously meets the needs of both mobile and fixed receivers. | |||
| Key words：frequency division multi-serviceadvanced digital terrestrial multimedia broadcasting (DTMB-A)offset quadrature amplitude modulation (OQAM)isotropic orthogonal transfer algorithm (IOTA) | |||
| 收稿日期: 2013-05-16 出版日期: 2015-04-16 | |||
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| 基金资助:国家自然科学基金资助项目 (61271266);国家 “八六三” 高技术项目 (2011AA11A280) | |||
| 引用本文: |
| 郝博, 王军, 王昭诚. 基于DTMB-A系统的高效频分多业务[J]. 清华大学学报（自然科学版）, 2014, 54(2): 275-280. Bo HAO, Jun WANG, Zhaocheng WANG. Efficient frequency division multi-service based on DTMB-A systems. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 275-280. |
| 链接本文: |
| http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2014/V54/I2/275 |
图表:
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| 基于DTMB-A的频分多业务结构 | ||||||||||||||
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| 低频谱利用率的多业务结构 | ||||||||||||||
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| 所提多业务系统的时域结构 | ||||||||||||||
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| OQAM中的时频子格 | ||||||||||||||
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| 接收机SNR 20 dB时不同FFT大小下信道容量 | ||||||||||||||
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| 发射机实现框图 | ||||||||||||||
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| 接收机实现框图 | ||||||||||||||
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| 不同时域滤波器长度下带外干扰对比图 | ||||||||||||||
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| 仿真参数 | ||||||||||||||
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| TU-6时变信道下移动业务采用不同调制方式的性能 |
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