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Lattice Array Receiver and Sender for Spatially OrthoNormal MIMO Communication
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- Authors
- Dae Soon Cho, Hyeong Jun Park
- Issue Date
- 2006-05
- Citation
- Vehicular Technology Conference (VTC) 2006 (Spring), pp.192-195
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- In the field of wireless mobile communications, various types of 4G(4th Generation) systems have been designed and developed over many countries. We also have been developing the HMm (High-Speed Multimedia Mobile) 4G testbed system with the specification of ECSUS(Enhanced Cellular System for Ubiquitous Service) that is designed at ETRI(Electronics and Telecommunications Research Institute). The HMm system is adopting OFDM (Orthogonal Frequency Division Multiplexing) modulation method, especially 2×2 MIMO (Multiple Input Multiple Output) OFDM. In the OFDM system, symbols are transmitted in parallel on several narrow-band subchannels, which are overlapping and orthogonal. Clock difference in sampling frequencies between an access system and a user equipment can lead to serious performance degradation due to the loss of orthogonality between the subcarriers. Therefore, the sampling frequency offset has to be estimated correctly and the error has to be compensated at the receiver, In this paper, we evaluated the performance of the HMm 4G MIMO OFDM testbed system according to the clock frequency offset values and proposed an improved algorithm to minimize the effect of clock frequency offsets. © 2006 IEEE.
- KSP Keywords
- 4th generation(4G), Cellular system, Clock frequency, High Speed, Improved algorithm, Mimo communication, Modulation method, Multiple input multiple output(MIMO), Multiple input multiple output orthogonal frequency division multiplexing(MIMO-OFDM), Narrow band, OFDM systems