Chang-Wahn Yu

An efficient simplified behavioral model for RF power amplifiers

We present efficient simplified behavioral models for power amplifier(PA) and its digital predistorter(DPD). Even though the many promising models have been proposed, more rigorous derivation and improvements in terms of performance and complexity are needed. In this paper, new approach is attempted to tackle the above. After building basis set based on simple rules, the new efficient and simplified models are derived by adding only the appropriate basis into the previous composite bases. The experimental results show that the proposed models for the PA and DPD outperform the conventional models.

On the Design of Wideband CDMA User Equipment (UE) Modem

This paper describes the details of the implementation issues on wideband CDMA UE Modem, concentrating on the receiving side. Employed top-down design methodology and corresponding work efforts on each task are stated to demonstrate the effectiveness of the methodology.

Conformance test results of wideband CDMA user equipment (UE) modem

Test results of a wideband CDMA (WCDMA) UE modem are presented. Various levels of verification were employed. Verification was initiated with a stand-alone test using test equipment which performs the functions of a base-station transceiver system (BTS). A point-to-point functional test between UE and BTS was the subsequent test step, and then a system-level test was launched to validate the system-level issues which can be found in the terminal conformance specification TS34.121.

Performance validation of wideband CDMA user equipment (UE) modem

This paper validates the performance of wideband CDMA UE modem under the propagation conditions specified in 3GPP TS25.101. The performance graphs in this paper are obtained via Monte-Carlo simulation over a finite measurement period using the HW-equivalent fixed-point model. Employed top-down design methodology and corresponding work efforts on each task are stated to demonstrate the effectiveness of the methodology.