A Novel Iterative Decision-Directed Differential Detection Technique for Differential OFDM Systems
A Novel Iterative Decision-Directed Differential Detection Technique for Differential OFDM Systems
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一种新颖的差分 OFDM 系统迭代决策导向差分检测技术
DOI：
10.1109/glocom.2009.5425386
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Z. Hong
中科院分区：
文献类型：
--
作者：
Liang Zhang;L. Thibault;Z. Hong
针对尤里卡147数字音频/多媒体广播（DAB/DMB）系统中每个子载波采用差分相移键控（DPSK）调制的正交频分复用（OFDM）系统，提出了一种新的迭代判决引导差分检测（iD 4）技术。iD 4技术通过估计和补偿时域信道相位变化（CPV）来提高差分检测在快衰落信道中的性能。计算机仿真结果表明，与传统的差分检测（CDD）相比，iD 4的性能得到了显著的改善，并且OFDM接收机能够获得满意接收的最大多普勒扩展得到了极大的扩展。以在L波段以模式IV操作的DAB/DMB系统为例，在典型城市（TU）信道环境中，iD 4将最大接收器车辆速度从95公里/小时（km/h）增加到190公里/小时。
We propose a novel Iterative Decision-Directed Differential Detection (iD4) technique for Orthogonal Frequency Division Multiplexing (OFDM) systems employing Differential Phase Shift Keying (DPSK) modulation in each subcarrier, such as the Eureka 147 Digital Audio/Multimedia Broadcasting (DAB/DMB) system. The iD4 technique improves the differential detection performance in fast fading channels by estimating and compensating the time-domain Channel Phase Variation (CPV). Computer simulations show that significant performance improvement is achieved by using iD4 over Conventional Differential Detection (CDD), and the maximum Doppler spread, at which the OFDM receiver can achieve satisfactory reception, is greatly extended. Taking the DAB/DMB system operating in mode IV at L-band as an example, iD4 increases the maximum receiver vehicle speed from 95 kilometers per hour (km/h) to 190 km/h, in a Typical Urban (TU) channel environment.