Title :
Power reduction in wireless receivers through multistage digital filtering and quantization
Author :
Andrews, Jeffrey G. ; Meng, Teresa H Y
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., CA, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
The number of bits required to accurately represent a received signal in a wireless system changes as the out-of-band interference is removed by an IIR digital filter, if the filtering is done in stages, such as second-order sections. Taking advantage of this fact can reduce the size of the datapath in a VLSI realization of a digital filter, and hence power and area can be saved without decreasing performance. An effective algorithm for computing this reduced number of bits to use for quantization after each stage is derived, and a scheme for optimally ordering the second-order sections is presented, power savings range from 33% to 50%, depending on the amount of out-of-band interference
Keywords :
IIR filters; VLSI; interference; radio access networks; radio receivers; IIR digital filter; VLSI realization; datapath; multistage digital filtering; out-of-band interference; power reduction; quantization; second-order sections; wireless receivers; Digital filters; Dynamic range; Energy consumption; Filtering; IIR filters; Interference; Quantization; Signal processing; Telecommunication computing; Very large scale integration;
Conference_Titel :
Signal Processing Systems, 1999. SiPS 99. 1999 IEEE Workshop on
Conference_Location :
Taipei
Print_ISBN :
0-7803-5650-0
DOI :
10.1109/SIPS.1999.822358