Blind Channel Estimation Based on Multilevel Lloyd-Max Iteration for Nonconstant Modulus Constellations

المؤلفون المشاركون

Lei, Jing
Li, Yanbin
Li, Xiaotian
Liu, Wei
Li, Erbao

المصدر

Journal of Applied Mathematics

العدد

المجلد 2014، العدد 2014 (31 ديسمبر/كانون الأول 2014)، ص ص. 1-7، 7ص.

الناشر

Hindawi Publishing Corporation

تاريخ النشر

2014-07-20

دولة النشر

مصر

عدد الصفحات

7

التخصصات الرئيسية

الرياضيات

الملخص EN

In wireless communications, knowledge of channel coefficients is required for coherent demodulation.

Lloyd-Max iteration is an innovative blind channel estimation method for narrowband fading channels.

In this paper, it is proved that blind channel estimation based on single-level Lloyd-Max (SL-LM) iteration is not reliable for nonconstant modulus constellations (NMC).

Then, we introduce multilevel Lloyd-Max (ML-LM) iteration to solve this problem.

Firstly, by dividing NMC into subsets, Lloyd-Max iteration is used in multilevel.

Then, the estimation information is transmitted from one level to another.

By doing this, accurate blind channel estimation for NMC is achieved.

Moreover, when the number of received symbols is small, we propose the lacking constellations equalization algorithm to reduce the influence of lacking constellations.

Finally, phase ambiguity of ML-LM iteration is also investigated in the paper.

ML-LM iteration can be more robust to the phase of fading coefficient by dividing NMC into subsets properly.

As the signal-to-noise ratio (SNR) increases, numerical results show that the proposed method’s mean-square error curve converges remarkably to the least squares (LS) bound with a small number of iterations.

نمط استشهاد جمعية علماء النفس الأمريكية (APA)

Li, Xiaotian& Lei, Jing& Liu, Wei& Li, Erbao& Li, Yanbin. 2014. Blind Channel Estimation Based on Multilevel Lloyd-Max Iteration for Nonconstant Modulus Constellations. Journal of Applied Mathematics،Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-449382

نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)

Li, Xiaotian…[et al.]. Blind Channel Estimation Based on Multilevel Lloyd-Max Iteration for Nonconstant Modulus Constellations. Journal of Applied Mathematics No. 2014 (2014), pp.1-7.
https://search.emarefa.net/detail/BIM-449382

نمط استشهاد الجمعية الطبية الأمريكية (AMA)

Li, Xiaotian& Lei, Jing& Liu, Wei& Li, Erbao& Li, Yanbin. Blind Channel Estimation Based on Multilevel Lloyd-Max Iteration for Nonconstant Modulus Constellations. Journal of Applied Mathematics. 2014. Vol. 2014, no. 2014, pp.1-7.
https://search.emarefa.net/detail/BIM-449382

نوع البيانات

مقالات

لغة النص

الإنجليزية

الملاحظات

Includes bibliographical references

رقم السجل

BIM-449382