http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Weighted Combining Wireless Location Algorithm for Mobile-WiMAX Femto-Cell Environments
KIM, Sanhae,YOO, Myungsik,SHIN, Yoan The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.3
<P>The conventional TDoA (Time Difference of Arrival)-based and RSS (Received Signal Strength)-based location schemes create large positioning errors because of the various wireless channel effects such as path loss, shadowing, and NLoS (Non-Line-of-Sight) components of the multipath channels. In this paper, we propose an improved wireless location scheme which performs a weighted combination of the TDoA and RSS location schemes to improve a detection probability in the mobile-WiMAX femto-cell environments.</P>
Near-Optimum Detection with Low Complexity for Uplink Virtual MIMO Systems
Kim, Sanhae,Shin, Oh-Soon,Shin, Yoan Hindawi Publishing Corporation 2009 Eurasip Journal on Wireless Communications and Net Vol.2009 No.-
<P>In mobile worldwide interoperability for microwave access (WiMAX) or 3rd Generation partnership project long-term evolution (3GPP-LTE), uplink virtual multiple input multiple output (MIMO) technology is adopted to perform spatial multiple access with two portable subscriber stations (PSSs), where each PSS has an antenna. As two PSSs transmit simultaneously on the same orthogonal frequency division multiple access (OFDMA) resource blocks, the overall uplink capacity will be doubled. To employ this interesting technique with high performance, most system venders demand the optimal maximum-likelihood detection (MLD) scheme in the radio access station (RAS). However, the optimal MLD is difficult to implement due to its explosive computational complexity. In this paper, we propose two efficient MIMO decoding schemes that achieve near-optimum performance with low complexity for uplink virtual MIMO systems that have an iterative channel decoder using bit log-likelihood ratio (LLR) information. The simulation results show that the proposed schemes have almost the same block error rate (BLER) performance as that of the optimal MLD with only about 15.75% and 28% computational complexity in terms of real multiplication, when both PSSs transmit 16 quadrature amplitude modulation (QAM) signals, and only about 3.77% and 7.22% for 64 QAM signals.</P>