TY - JOUR
T1 - Policy-based multiple access for decentralized low power systems
AU - Muharemovic, Tarik
AU - Sabharwal, Ashutosh
AU - Aazhang, Behnaam
N1 - Funding Information:
Manuscript received September 16, 2007; revised March 13, 2008; accepted May 31, 2008. The associate editor coordinating the review of this paper and approving it for publication was Y. Zhang. This work was, in part, presented at the ISIT [15], and at the ITW [16]. The research was funded by the NSF Grant CCR-0311398. T. Muharemovic is with Texas Instruments (TI), Communications Infrastructure and Voice (CI&V), Dallas, TX, 75243 USA (e-mail: [email protected]). A. Sabharwal and B. Aazhang are with the Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005 USA (e-mail: {ashu, aaz}@rice.edu). Digital Object Identifier 10.1109/T-WC.2009.071022
PY - 2009/1
Y1 - 2009/1
N2 - In this paper, we present an information theoretic study of a decentralized multiple access channel (MAC), where users are allowed to autonomously change their data rates, transmission powers, and channel codes, independently from other users in the system. We introduce a policy-based access mechanism, where each user is allocated a set of code-books, with various data rates and powers. Successful reception of all users is guaranteed, provided that each of the users adheres to its assigned access policy, when selecting its date rate and power. We completely characterize the capacity region for such policy-based access in the low power regime, for both single and multi-antenna (MIMO) systems, and we show that nonorthogonal policies outperform orthogonal ones. We also show that known MIMO capacity scaling laws, which apply in single user systems, carry over into framework of decentralized MAC.
AB - In this paper, we present an information theoretic study of a decentralized multiple access channel (MAC), where users are allowed to autonomously change their data rates, transmission powers, and channel codes, independently from other users in the system. We introduce a policy-based access mechanism, where each user is allocated a set of code-books, with various data rates and powers. Successful reception of all users is guaranteed, provided that each of the users adheres to its assigned access policy, when selecting its date rate and power. We completely characterize the capacity region for such policy-based access in the low power regime, for both single and multi-antenna (MIMO) systems, and we show that nonorthogonal policies outperform orthogonal ones. We also show that known MIMO capacity scaling laws, which apply in single user systems, carry over into framework of decentralized MAC.
KW - Ad - Hoc
KW - Antenna correlation
KW - Decentralized multiple access
KW - Low-power regime
KW - MIMO
KW - Multi - antenna
KW - Multiple access
KW - Policy
KW - Spectral efficiency
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U2 - 10.1109/T-WC.2009.071022
DO - 10.1109/T-WC.2009.071022
M3 - Article
AN - SCOPUS:61349195309
SN - 1536-1276
VL - 8
SP - 256
EP - 267
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 1
M1 - 4786506
ER -