Title :
A differential Alamouti coding scheme for OFDM based asynchronous cooperative systems
Author :
Liu, Longwei ; Zhang, Hailin ; Lu, Xiaofeng ; Li, Yongzhao
Author_Institution :
State Key Lab. of Integrated Service Networks, Xidian Univ., Xi´´an, China
Abstract :
In this paper, we present a differential OFDM Alamouti coding based transmission scheme for two relay cooperative system. The relay nodes, only need the time-reversion, some sign changes, the complex conjugation to the received signals, and no IFFT or FFT is needed. At the destination node, decoding is achieved with low decoding complexity based on differential Alamouti code. Simulation results show that the differential scheme is a little worse than coherent detection without the channel state information (CSI).
Keywords :
OFDM modulation; asynchronous transfer mode; cooperative communication; decode and forward communication; decoding; OFDM based asynchronous cooperative systems; channel state information; coherent detection; differential Alamouti coding scheme; low decoding complexity; two relay cooperative system; Coherence; Encoding; Frequency domain analysis; OFDM; Relays; Signal to noise ratio; Wireless communication; Imperfect Channel State Information (CSI); Orthogonal frequency-division multiplexing (OFDM); asynchronous cooperative diversity; differential Alamouti code;
Conference_Titel :
Communication Software and Networks (ICCSN), 2011 IEEE 3rd International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-61284-485-5
DOI :
10.1109/ICCSN.2011.6013659
