Optimum power allocation for preamble detection with channel-adaptive random access

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Channel-adaptive random access can reduce the power required for successful random access transmission in a TDD-based wireless system. With channel-adaptive random access, transmission of a random access packet is delayed until a predefined channel condition is satisfied. The performance of channel-adaptive random access has been investigated with suboptimal power allocations including constant and channel inversion power allocations. However, the optimal power allocation has not been studied for channel-adaptive random access. In this paper, the optimum power allocation is derived for channel-adaptive random access, especially considering the detection performance of a random access preamble. Some important properties are investigated for the optimum power allocation. Numerical results compare the performances of the optimum and the suboptimal power allocations.

Original languageEnglish
Pages (from-to)5424-5433
Number of pages10
JournalIEEE Transactions on Wireless Communications
Issue number11
StatePublished - 2013 Nov 1


  • Low power communication
  • Power allocation
  • Power limitation
  • Random access

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