DIGITAL PERDISTORTION TECHNIQUE FOR COMPENSATING MEMORY EFFECTS OF POWER AMPLIFIERS IN WIDEBAND APPLICATIONS

作者：Varahram Pooria^*; Mohammady Somayeh; Hamidon Mohd Nizar; Sidek Roslina M; Khatun Sabira

来源：Journal of Electrical Engineering, 2009, 60(3): 129-135.

• digital predistortion
• memory effects
• ACLR
• power amplifier
• WCDMA

The application of digital predistortion in base band signal is an extended method of amplifier linearization to reduce the Adjacent Channel Interference (ACI) in those systems in which a varying envelope modulation scheme like OFDM and MQATM is used. Digital baseband predistortion is a highly cost-effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA), wideband orthogonal frequency-division multiplexing (W-OFDM) and worldwide interoperability for microwave access (WiMAX), PA memory effects can no longer be ignored. In this paper a novel technique for compensating such effects is proposed, This technique is a combination of two techniques, memory polynomial predistortion and the gain based predistorter method. This method is compared with the other technique, memory polynomial method and validated using a Mini-Circuit power amplifier and QPSK signal with 1 MHz bandwidth. Simulations and results show improvement in ACLR reduction and EVM with applying this method.

• 出版日期2009-6