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http://dx.doi.org/10.5515/KJKIEES.2008.19.5.547

The Gain and Phase Mismatch Detection Method with Closed Form Solution for LINC System Implementation  

Myoung, Seong-Sik (Georgia Electronic Design Center, Georgia Institute of Technology)
Lee, Il-Kyoo (Department of Information and Communication Engineering, Kongju National University)
Lim, Kyu-Tae (Georgia Electronic Design Center, Georgia Institute of Technology)
Yook, Jong-Gwan (Department of Electrical and Electronic Engineering, Yonsei University)
Laskar, Joy (Georgia Electronic Design Center, Georgia Institute of Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.19, no.5, 2008 , pp. 547-555 More about this Journal
Abstract
This parer proposed the path mismatch detection and compensation algorithm with closed form for linear amplification with non-linear components(LINC) system implementation. The LINC system has a merit of using the high efficient amplifier by transferring the non-constant envelop signal which is high peak to average signal ratio into constant envelop signal. However, the performance degradation is very sensitive to the path mismatch such as an amplitude mismatch and a phase mismatch. In order to improve the path mismatch, the error detection and compensation method is introduced by the use of four test signals. Since the presented method has the closed form solution, the efficient and fast detection is available. The digital-IF structure of LINC system applied by the proposed error detection and compensation algorithm was implemented. The performance was evaluated with the IEEE 802.16 WiMAX baseband sinal which has 7 MHz channel bandwidth and 16-QAM. The Error Vector Magnitude(EVM) of -37.37 dB was obtained through performance test, which meets performance requirement of -24 dB EVM. As a result, the introduced error detection and compensation method was verified to improve the LINC system performance.
Keywords
LINC; Power Amplifier; Efficiency; Mismatch Detection; Compensation; Implementation;
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