Title :
The role of the ±1 number system in multibit hardware correlators
Author_Institution :
Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, USA
fDate :
10/1/1989 12:00:00 AM
Abstract :
The use of commercially available 1-bit large-scale integration (LSI) correlator chips whose main function is the correlation of sequences of plus ones and minus ones (rather than zeros and ones) as building blocks in the design of multibit correlators is investigated. A radix-2 number system in which the bit values are ±1 (no zero) is discussed. The development of a simple conversion algorithm to find the ±1 representation of a number given in 2´s complement is presented. Some of the issues raised by this conversion algorithm are discussed. It is shown that if the analog signal is available, there is a simple step to take before the analog-to-digital conversion in order to improve the overall precision. The construction of multibit correlators based on the ±1 system is compared to alternative approaches
Keywords :
correlators; digital integrated circuits; large scale integration; ±1 number system; 1 bit; 1 bit LSI correlation chips; 2´s complement; ADC; analog signal; analog-to-digital conversion; conversion algorithm; multibit hardware correlators; radix-2 number system; Communication channels; Correlators; Hardware; Large scale integration; Noise generators; Propulsion; Quantization; Signal generators; Signal processing algorithms; Space technology;
Journal_Title :
Acoustics, Speech and Signal Processing, IEEE Transactions on
