Publications

Anonym
/ Categories: Publications

Mitigating Error Propagation in Two-Way Relay Channels with Network Coding

Author(s): Nguyen, SLH (Nguyen, Sinh Le Hong); Ghrayeb, A (Ghrayeb, Ali); Al-Habian, G (Al-Habian, Ghaleb); Hasna, M (Hasna, Mazen) Source: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 9 (11): 3380-3390 NOV 2010

In relay networks, error propagation at the relay nodes degrades the performance of the system. To combat that effect, it has been suggested to implement a reliability threshold at the relay to control error propagation. Specifically, the relay calculates log-likelihood ratio (LLR) values for the bits sent from the source. These values are subjected to a threshold to selectively forward bits that are most reliable and discard bits that are less so, resulting in less errors propagating to the destination. We investigate the application of this technique to a network-coded two-way relay channel where the relay is assisting two sources simultaneously. We first consider network-coded systems without channel coding, and then consider network-channel coded systems. We examine two modes of thresholding, one based on the individual bits, and the other based on the combined bits. We provide the full analysis for the bit-error rate (BER) performance of both thresholding modes and optimize the thresholds accordingly. We demonstrate that the optimum thresholds based on both modes give similar performances and are far better than the case of no thresholding. We also consider the performance of the proposed thresholding techniques for network-channel coded systems. We present several numerical examples that illustrate the efficacy of employing thresholding at the relay nodes (for networks with and without channel coding).

Author(s):  Nguyen, SLH (Nguyen, Sinh Le Hong); Ghrayeb, A (Ghrayeb, Ali); Al-Habian, G (Al-Habian, Ghaleb); Hasna, M (Hasna, Mazen) 
Source:  IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 9 (11): 3380-3390 NOV 2010 
Language:  English 
Document Type:  Article 
Author Keywords:  Cooperative communications; error propagation; network coding; relay networks; threshold-based relaying 
KeyWords Plus: USER COOPERATION DIVERSITY; STRATEGIES; DECODE
Addresses:  [Nguyen, Sinh Le Hong; Ghrayeb, Ali; Al-Habian, Ghaleb] Concordia Univ, Dept Elect & Comp Engn, Montreal, PQ H3G 1M8, Canada; [Hasna, Mazen] Qatar Univ, Dept Elect Engn, Doha, Qatar 
Reprint Address:  Nguyen, SLH, Concordia Univ, Dept Elect & Comp Engn, Montreal, PQ H3G 1M8, Canada. 
Funding Agency:  This work was supported in part by Qatar National Research Fund (QNRF) Grant XP0034 and Qatar Telecom (Qtel) Grant XP0037. 
Publisher:  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC 
Publisher Address:  445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA 
ISSN:  1536-1276 
29-char Source Abbrev.: IEEE TRANS WIREL COMMUN 
ISO Source Abbrev.: IEEE Trans. Wirel. Commun. 
Subject Category:  Engineering, Electrical & Electronic; Telecommunications 
ISI Document Delivery No.:  680HX 
Previous Article On the Viscosity of Natural Gases from Qatari North Field Reservoir
Next Article Constitutive recycling of the store-operated Ca2+ channel Orai1 and its internalization during meiosis
Print
2471 Rate this article:
No rating

Theme picker

DeSIGN: Guided Practice for Sign Language

DeSIGN: Guided Practice for Sign Language

Children learn and practice their vocabulary through interaction with parents and friends as well as through formal instruction at school. However, for deaf children, sign language is the main...
Calcium channels determine how life begins, and ends
Calcium channels determine how life begins, and ends

Calcium channels determine how life begins, and ends

Ongoing work at Weill Cornell Medical College in Qatar (WCMC-Q) is investigating how intracellular calcium (Ca2+) signaling pathways are involved in the very beginning of life as they prepare the...
Taking gas-to-liquid technology to the next level
Taking gas-to-liquid technology to the next level

Taking gas-to-liquid technology to the next level

In the 1920s, two German scientists—Franz Fischer and Hans Tropsch—developed revolutionary chemical reactions that could transform gas into liquid. These reactions proved particularly...
Researchers build the case for wind and wave studies in Qatar
Researchers build the case for wind and wave studies in Qatar

Researchers build the case for wind and wave studies in Qatar

For the first time, fine detail about the wind and wave conditions around the coast of Qatar has been recorded. By arranging the most sophisticated equipment available on the edge of a 500-meter...
RSS

Theme picker