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Symbol Power Allocation and Channel Estimation Method for LR-WPAN System  

Lee, Kyung-Tak (Inha University)
Lee, Sung-Jun (Inha University)
Sohn, Sung-Hwan (Inha University)
Kim, Jae-Moung (Inha University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.11, 2007 , pp. 1-10 More about this Journal
Abstract
In this paper, we proposed channel estimation scheme for LR-UWB system which has low data rate for WPAN in IEEE 802.15.4a. At the transmitter, we proposed dynamic power level allocation depends on channel condition in specific period when we modulate signal. We use two orthogonal code to estimate channel at once. It can estimate channel more accurately by using two code which shows good correlation characteristic then it can estimate more accurately by spreading gain. Using estimated channel condition, we synchronize symbol timing of transmitted signal. Then determined power allocation scheme and channel information is transmitted to transmiter side. Finally, using these information, transmiter side change the power level of repeated pulse to adopt to channel condition. Simulation is performed under S-V channel for LR-WPAN in IEEE 802.15.4a and we compare the performance with a different type of receiver type. We use coherent and non-coherent method at the receiver. Simulation result shows us at the NLOS channal performance evaluation is greater than that of LOS channel and the result is independent of receiver type. In the NLOS channel, as the signal delay spreading is big, performance evaluation is also increased.
Keywords
802.15.4; LR-WPAN; UWB; PPM; Channel Estimation; Power Allocation;
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