Volume 10, Issue 1 (3-2018)                   IJICTR 2018, 10(1): 62-69 | Back to browse issues page

XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Azad M, Sadough S M S. Enhanced Iterative Detection of Hierarchically Modulated Signals using VB-EM Algorithm. IJICTR. 2018; 10 (1) :62-69
URL: http://ijict.itrc.ac.ir/article-1-233-en.html
1- Department of Electrical Engineering, Shahid Beheshti University G.C., Tehran 1983969411, Iran , ma.azad@mail.sbu.ac.ir
2- Department of Electrical Engineering, Shahid Beheshti University G.C., Tehran 1983969411, Iran
Abstract:   (508 Views)
In Hierarchical Modulation (HM), the binary data is partitioned into a “high-priority” (HP) and a “low-priority” (LP) bit stream that are separately and independently encoded before being mapped on non-uniformly spaced constellation points. Indeed, HM is a multi-level modulation scheme, proposed for enabling unequal error protection. The HP and LP streams vary in their susceptibility to noise. The basic HP signal is more robust, in other words, heavily protected against noise and interference, whereas the LP stream has much less robustness. In this paper, we propose an improved iterative receiver based on variational Bayesian expectation-maximization (VB-EM) scheme for semi-blind joint channel estimation and data detection based on bit-interleaved coded modulation (BICM), with the aim of improving the bit error rate (BER) of the noisy LP stream. Moreover, the proposed receiver allows us to reduce the pilot symbol overhead compared to the classical HM receivers based on pilot-assisted channel estimation.
Full-Text [PDF 1145 kb]   (195 Downloads)    
Type of Study: Research | Subject: IT

Add your comments about this article : Your username or Email:
CAPTCHA code

Send email to the article author