Title :
Full Diversity Spreading code for Downlink Space-Time-Frequency Spreading CDMA
Author :
Liu, Siyang ; Wang, Feifei ; Zhang, Ranran ; Wang, Yachen ; Liu, Yuanan
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
Recently proposed downlink space-time-frequency spreading CDMA (STFS-CDMA) is investigated in this paper. By analyzing, a spreading code design criterion of it is derived. From the criterion, we can see that the original two classes of spreading code adopted in STFS-CDMA, Walsh-Hadamard code (WHC) and double-orthogonal code (DOC), both can not always achieve the full space and frequency diversity. Then, a novel spreading code, zero padded rotary FFT code (ZPRFC), is proposed. Compared with WHC coded STFS-CDMA (WHC-STFS-CDMA) and DOC coded STFS-CDMA (DOC-STFS-CDMA), the novel ZPRFC coded STFS-CDMA (ZPRFC-STFS-CDMA) can obtain the full space and frequency diversity at the cost of the reduction of the number of supporting users.
Keywords :
Hadamard codes; Hadamard transforms; code division multiple access; diversity reception; fast Fourier transforms; radio links; spread spectrum communication; transform coding; Walsh-Hadamard code; double-orthogonal code; downlink space-time-frequency spreading CDMA; frequency diversity; full diversity spreading code; full space diversity; zero padded rotary FFT code; Diversity reception; Downlink; Frequency diversity; Frequency domain analysis; MIMO; Multiaccess communication; Multicarrier code division multiple access; OFDM; Receiving antennas; Transmitting antennas;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.947
