Low-power adaptive pseudo noise code acquisition for spread-spectrum systems

Author

Wu, Mau-Lin ; Wen, Kuei-Ann

Author_Institution

Logic Res. & Dev. Dept. I, Integrated Circuit Solution Inc., Hsin-Chu, Taiwan

Volume

1

Issue

4

fYear

2002

fDate

10/1/2002 12:00:00 AM

Firstpage

748

Lastpage

760

Abstract

A novel pseudo noise code acquisition combined with the newly proposed adaptive sampling rate and threshold control (ASTC) algorithm is derived for low-power spread-spectrum systems with complementary metal-oxide-semiconductor implementations. Low-power performance can be achieved by reducing the sampling rate of the proposed system while maintaining the system performance. The sampling rate is dynamically updated due to the change of the channel noise level. Under the assumptions that the channel is additive white Gaussian noise slow-fading channel, up to 74.3% reduction in power consumption compared to the conventional fixed-sampling rate and fixed-threshold architecture is demonstrated with insignificant increase of system complexity. The proposed architecture can be applied to the design of low-power and controllable-performance spread-spectrum communication systems.

Keywords

AWGN; CMOS integrated circuits; VLSI; adaptive systems; fading channels; pseudonoise codes; signal sampling; spread spectrum communication; synchronisation; AWGN; CMOS VLSI; PN code acquisition; adaptive sampling rate algorithm; additive white Gaussian noise; channel noise; complementary metal-oxide-semiconductor; fixed-sampling rate; fixed-threshold architecture; low-power adaptive pseudonoise code acquisition; low-power spread-spectrum systems; power consumption reduction; sampling rate reduction; slow-fading channel; spread-spectrum communication systems; system performance; threshold control algorithm; Adaptive control; Additive white noise; Communication system control; Control systems; Energy consumption; Noise level; Programmable control; Sampling methods; Spread spectrum communication; System performance;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2002.804187

Filename

1045305