TY - GEN
T1 - A novel architecture of single-carrier block transmission DS-CDMA
AU - Chang, Ming Xian
AU - Yang, Chou Chang
PY - 2006
Y1 - 2006
N2 - Single-carrier (SC) block transmission [1][2] is an efficient scheme in multipath channels. With frequency-domain equalization, SC block transmission avoids complex time-domain equalization. There are also several systems proposed that combine SC-FDE with code-division multiple access (CDMA). However, unlike conventional direct-sequence (DS) CDMA, the present CDMA systems with FDE may be not suitable for asynchronous users, for lack of a signal model that could suitably express the despread signal in frequency domain. In this paper, we propose a novel architecture of SC block transmission DS-CDMA that can be applied for asynchronous users. A new signal model is derived that represents spreading, channel effect, and despreading as a series of circular convolutions. This signal model helps in deriving a new frequency-domain minimum mean-square error (MMSE) equalization algorithm for SC block transmission CDMA. Based on the proposed signal model, we also propose a simple channel estimation algorithm. Our architecture and signal model can be applied for further development of multi-user detection algorithms.
AB - Single-carrier (SC) block transmission [1][2] is an efficient scheme in multipath channels. With frequency-domain equalization, SC block transmission avoids complex time-domain equalization. There are also several systems proposed that combine SC-FDE with code-division multiple access (CDMA). However, unlike conventional direct-sequence (DS) CDMA, the present CDMA systems with FDE may be not suitable for asynchronous users, for lack of a signal model that could suitably express the despread signal in frequency domain. In this paper, we propose a novel architecture of SC block transmission DS-CDMA that can be applied for asynchronous users. A new signal model is derived that represents spreading, channel effect, and despreading as a series of circular convolutions. This signal model helps in deriving a new frequency-domain minimum mean-square error (MMSE) equalization algorithm for SC block transmission CDMA. Based on the proposed signal model, we also propose a simple channel estimation algorithm. Our architecture and signal model can be applied for further development of multi-user detection algorithms.
UR - http://www.scopus.com/inward/record.url?scp=34548816494&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34548816494&partnerID=8YFLogxK
U2 - 10.1109/VTCF.2006.191
DO - 10.1109/VTCF.2006.191
M3 - Conference contribution
AN - SCOPUS:34548816494
SN - 1424400635
SN - 9781424400638
T3 - IEEE Vehicular Technology Conference
SP - 892
EP - 896
BT - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
T2 - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Y2 - 25 September 2006 through 28 September 2006
ER -