Reverse link demodulator ASIC for CDMA cellular system

Abstract

In this paper, we describe the design and implementationof code division multiple access (CDhU) base station demodulator (CBD) ASIC for the use in IS9.5-based CDMA mobile communication system. We propose a novel design method for the noncoherent OQPSK YN cowelator, fast Hadamard transfomier (FHv, lock detector, and time tracking loop, which are the main fitwctional blocks of the demodulator. We also present the implementation environment for the design and verification of demodulator ASIC. The chip has been designed using cell-based design methodology and fabricated by double-metal 0.8-pn CMOS technology. The die of the chip measures 8. I x 8.3 mm and it contain approximately 76,000 logic gates and 3,000 bits of static RAM.