时变多径MIMO信道中一种带自适应信道追踪的序列检测方法
doi: 10.3724/SP.J.1146.2008.00856
A Sequence Detection Method with Adaptive Channel Tracking in Time-varying Multipath MIMO Channels
-
摘要: 该文针对时变多径MIMO信道，各MISO子系统首先分别采用混合MLSE(H-MLSE)处理，然后结合-幸存状态选择，提出了一种复杂度可控的、带自适应信道追踪的序列检测方法。与传统的MLSE算法相比，该方法具有3个显著特征：通过参数选择，可实现对算法复杂度的可控调节；通过嵌入的判决导向/LMS(DD/LMS)算法，对各幸存状态转移对应的幸存路径上的信道参数可实现接近零时延追踪；可部分采用并行处理技术来实现。对具有两条多径的2X4 MIMO时变信道通过数值仿真表明：当2时，该方法可获得满意的检测性能。Abstract: Adopting the hybrid MLSE (H-MLSE) on each MISO subsystem firstly, and then combining the -selection of survival states, a complexity-controllable sequence detention method with adaptive channel tracking is proposed for Multi-Input Multi-Output (MIMO) time-varying multipath channels. In contrast to the conventional MLSE, the proposed method has three features: (1) the adjustable computational complexity, which can be achieved by adjusting the parameter; (2) the on-line channel tracking with near zero-delay, which is embedded in the scheme and accomplished for each selected survival state transition along the corresponding path by decision-directed/LMS algorithm (DD/LMS); (3) It can be partly implemented by parallel processing technology. The simulation results show the proposed method can achieve the satisfactory detection performance for 2X4 time-varying MIMO channel with two multipaths when 2.
-
Ezio B, Robert C, and Anthony C. et al. MIMO WirelessCommunications. London: Cambridge University Press, 2007:24-30.[2]He J Q, Gu G X, and Wu Z S. MMSE interferencesuppression in MIMO frequency selective and time-varyingfading channels[J].IEEE Transactions on Signal Processing.2008, 56(8):3638-3651[3]Raheli R, Marino G, and Castoldi P. Per-survivor processingand tentative decisions: what is in between? IEEETransactions on Communication, 1996, 44(2): 127-129.[4]Jung S J, Seung C H, and Yong H L. Adaptive MLSEreceiver: hybrid of persurvivor processing and tentativedecision MLSE[J].Electronics Letters.2000, 36(7):678-680[5]Manuel A V and Joaquin M. A per-survivor processingalgorithm for maximum likelihood equalization of MIMOchannel with unknown order. 2008 International ITGWorkshop on Smart Antennas (WSA 2008), Darmstadt, Feb.2008: 387-391.[6]Mohammad N P, Predrag B R, and Jinho C. Low complexitysequence detection for MIMO ISI channel with decisionfeedback MLSE. 2004 IEEE Eighth International Symposiumon Spread Spectrum Techniques and Applications, Sydney,Australia, Sept. 2004: 643-647. -
计量
- 文章访问数: 3193
- HTML全文浏览量: 68
- PDF下载量: 691
- 被引次数: 0
下载:
