Asymptotically Optimum Energy Profile for Successive Interference Cancellation in DS-CDMA under a Power Unbalance Constraint

作者：Sala Josep^*; Rey Francesc; Villares Javier

来源：IEEE Communications Letters, 2012, 16(2): 172-175.

DOI：10.1109/LCOMM.2011.121311.111964

• Successive interference cancellation
• power unbalance
• differential equation
• variational calculus
• packet error rate
• CDMA
• error propagation

A new Ordinary Differential Equation (ODE) governing the SNIR evolution of a Successive Interference Canceller (SIC) for DS-CDMA is derived when the number of users tends to infinity and all users share the same channel encoder. Using Variational Calculus, this ODE is applied to obtaining the energy profile that maximizes the average spectral efficiency when a constraint on the power unbalance (maximum power to minimum power ratio) of received users is enforced. The conditions for extremality of the optimum energy profile are established in terms of the common encoder%26apos;s Packet Error Rate (PER) function.

• 出版日期2012-2