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Multiuser power allocation in downlink of cooperative CDMA networks

Abdizadeh, M. T ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/PIMRC.2009.5450200
  3. Abstract:
  4. In this paper, we study the downlink of cooperative Direct-Sequence Code Division Multiple Access (DS-CDMA) systems, where a set of Mobile Terminals (MT) cooperate with the purpose of improving their downlink communications reliability with the Base Station (BS). For combating Multiple-Access Interference (MAI) as well as transferring complexity and spatial processing from the mobile terminals to the transmitter of BS, multiuser transmitter precoding is considered. In addition to multiuser precoding based on Minimum Mean-Square Error (MMSE) criterion for mitigating MAI, the proper transmission power control strategy under a fixed total power constraint is proposed and analyzed. Compared with equal transmission power assigning where BS and cooperative terminals transmit with the same power, the proposed power allocation scheme enables significant performance gain at the destination. Finally, simulation results demonstrate acceptable performance of the proposed algorithms in synchronous DS-CDMA systems. ©2009 IEEE
  5. Keywords:
  6. CDMA ; Downlink precoding ; CDMA networks ; Cooperative networks ; Direct sequence code division multiple access systems ; Downlink communications ; Minimum mean-square error ; Mobile terminal ; Multi-user ; Multi-user precoding ; Performance gain ; Power allocations ; Precoding ; Simulation result ; Spatial processing ; Synchronous DS-CDMA ; Total power ; Transmission power ; Transmission power control ; Transmitter precoding ; Algorithms ; Beamforming ; Computer terminals ; Direct sequence systems ; Mobile phones ; Multiple access interference ; Radio communication ; Radio interference ; Transmitters ; Turbo codes ; Wireless sensor networks ; Code division multiple access
  7. Source: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, 13 September 2009 through 16 September 2009 ; 2009 ; 9781424451234 (ISBN)
  8. URL: http://ieeexplore.ieee.org/document/5450200