S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Adaptive SIR estimation in WCDMA systems
- Yoon, Young-Shin; Lee, Yong-Hwan
- Issue Date
- VTC Spring 2002. IEEE 55th Vehicular Technology Conference, vol. 1, pp. 275-279, 2002
- The near-far problem and multipath fading degrade the performance of the CDMA transceiver. The use of transmit power control (TPC) is widely applied to alleviate these effects. It is required to estimate signal-to-interference power ratio (SIR) of the received signal for the TPC. As the accuracy of the SIR increases, the transmit power can be reduced without degrading the bit error rate (BER) performance, increasing the system capacity. In this paper, we propose an improved SIR estimate scheme. The proposed scheme increases the SIR accuracy by considering not only present slot information but also previous slot information. The number of previous slots is adjusted in response to the channel condition. The performance of the proposed SIR estimator is verified by computer simulation.
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