论文信息 - Dynamic Reconfigurable Architecture for a Low-Power Despreader in VSF-OFCDM Systems

Dynamic Reconfigurable Architecture for a Low-Power Despreader in VSF-OFCDM Systems

This paper presents a dynamic reconfigurable architecture for a low-power despreader in VSF-OFCDM systems. Since the spreading factors in time and frequency domains are dependent of cell configurations, channel loads, and propagation channels, a circuit structure of the despreader is to be optimized according to these variable conditions. The proposed despreader, it is based on a dynamic reconfigurable architecture, offers optimum concurrent and pipeline processing and minimizes memory accesses using an adder network. The results show that the proposed despreader has reduced power by 13-60% compared with a basic despreader.

Yoshikazu Miyanaga | Shingo Yoshizawa | Takayuki Sugawara

[1] Mamoru Sawahashi,et al. Investigation of Inter-Carrier Interference due to Doppler Spread in OFCDM Broadband Packet Wireless Access , 2002 .

[2] Elvino S. Sousa,et al. Multicarrier orthogonal CDMA signals for quasi-synchronous communication systems , 1994, IEEE J. Sel. Areas Commun..

[3] M. Munoz,et al. A new model for service and application convergence in B3G/4G networks , 2004, IEEE Wireless Communications.

[4] Mamoru Sawahashi,et al. Variable Spreading Factor-OFCDM with Two Dimensional Spreading that Prioritizes Time Domain Spreading for Forward Link Broadband Wireless Access , 2005, IEICE Trans. Commun..

[5] Mats Torkelson,et al. A new approach to pipeline FFT processor , 1996, Proceedings of International Conference on Parallel Processing.

[6] Alan Kai-Hau Yeung,et al. Challenges in the migration to 4G mobile systems , 2003, IEEE Commun. Mag..

[7] Hiroyuki Atarashi,et al. Variable Spreading Factor Orthogonal Frequency and Code Division Multiplexing (VSF-OFCDM) , 2002 .

[8] Anantha P. Chandrakasan,et al. Low-power CMOS digital design , 1992 .

[9] Americo Brajal,et al. Orthogonal multicarrier techniques applied to direct sequence spread spectrum CDMA systems , 1993, Proceedings of GLOBECOM '93. IEEE Global Telecommunications Conference.