Ergodic Sum-Rate Maximization for Fading Cognitive Multiple-Access Channels Without Successive Interference Cancelation

In this paper, the ergodic sum rate of a fading cognitive multiple-access channel (C-MAC) is studied, where a secondary network (SN) with multiple secondary users (SUs) transmitting to a secondary base station shares the spectrum band with a primary user (PU). An interference power constraint (IPC) is imposed on the SN to protect the PU. Under such a constraint and the individual transmit power constraint (TPC) imposed on each SU, the authors investigate the power allocation strategies to maximize the ergodic sum rate of a fading C-MAC without successive interference cancelation (SIC). In particular, this paper considers two types of constraints: 1) average TPC and average IPC and 2) peak TPC and peak IPC. For the first case, it is proved that the optimal power allocation is dynamic time-division multiple access (D-TDMA), which is exactly the same as the optimal power allocation to maximize the ergodic sum rate of the fading C-MAC with SIC under the same constraints. For the second case, it is proved that the optimal solution must be at the extreme points of the feasible region. It is shown that D-TDMA is optimal with high probability when the number of SUs is large. Moreover, the authors show that when the SUs can be sorted in a certain order, an algorithm with linear complexity can be used to find the optimal power allocation.

• Record URL:
  https://doi.org/10.1109/TVT.2014.2365182
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00189545
• Supplemental Notes:
  • Abstract reprinted with permission of IEEE.
• Authors:
  • Kang, X
  • Chong, H F
  • Chia, Y-K
  • Sun, S
• Publication Date: 2015-9

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 4009-4018
• Serial:
  • IEEE Transactions on Vehicular Technology
  • Volume: 64
  • Issue Number: 9
  • Publisher: Institute of Electrical and Electronics Engineers (IEEE)
  • ISSN: 0018-9545
  • Serial URL: http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=25

Subject/Index Terms

• TRT Terms: Algorithms; Interference; Multi access systems; Time division multiple access; Wireless communication systems
• Uncontrolled Terms: Fading channels (Wireless networks)
• Subject Areas: Data and Information Technology; Design; Highways; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 01578608
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 22 2015 9:31AM