Publications

Haya H Al Muhannadi
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Cooperation in the Low Power Regime for the MAC Using Multiplexed Rateless Codes

Author(s): Uppal, M (Uppal, Momin); Yang, ZG (Yang, Zigui); Host-Madsen, A (Host-Madsen, Anders); Xiong, ZX (Xiong, Zixiang)

In this paper, we consider cooperation in the low power (low SNR) regime for the multiple access channel with the assumption that the transmitters have no channel state information. A relevant performance measure to consider is therefore the outage capacity. We develop cooperation methods based on multiplexed coding in conjunction with rateless codes and find the achievable rates and in particular the minimum energy per bit required to achieve a certain outage probability. We consider two modes of operation: full duplex [code-division multiple access (CDMA)], where nodes can transmit and receive simultaneously on the same frequency band, and half duplex [frequency-division multiple access (FDMA)], where the nodes transmit and listen on different frequency bands. We show that, perhaps surprisingly, there is little loss in performance when using FDMA. Furthermore, our results show that multiplexed rateless codes come within 0.1 dB of the outer bound on capacity. We also develop practical rateless coding methods for FDMA using multiplexed Raptor codes which operate within 0.52 and 1.1 dB of the theoretical limit for the two-and four-user case, respectively.

Author(s):  Uppal, M (Uppal, Momin); Yang, ZG (Yang, Zigui); Host-Madsen, A (Host-Madsen, Anders); Xiong, ZX (Xiong, Zixiang)
Addresses:  [Uppal, Momin; Xiong, Zixiang] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA; [Yang, Zigui] Availink Inc, Germantown, MD 20874 USA; [Host-Madsen, Anders] Univ Hawaii Manoa, Dept Elect Engn, Honolulu, HI 96822 USA
Source:  IEEE TRANSACTIONS ON SIGNAL PROCESSING, 58 (9): 4720-4734 SEP 2010
DOI: 10.1109/TSP.2010.2052049
Publisher:  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Funding Agency:  Manuscript received January 28, 2010; accepted May 18, 2010. Date of publication June 07, 2010; date of current version August 11, 2010. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Walid Hachem. This work was supported in part by the NSF Grants 0729152 and 0729149 and Qatar National Research Fund.
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