No abstract

This paper discusses the design, implementation, and performance evaluation of a low powered comlator architecture for multi-code CDMA systems. In CDMA systems, correlators are used to de-spread the received signals and are important blocks for RAKE receivers. We proposed a low powered correlator architecture to de-spread input with several PN sequence concurrently. According to our preliminary simulation results, the suggested architecture can de-spread the input signal with two PN codes simultaneously and save 41% power consumption compared with traditional correlator architecture.'

Inter-symbol interference (ISI) is often regarded as an imiportant issue for high speed wireless applications. Due to the fast fading characteristic combining with the ISI, channel equalization in the wireless system often involves with dedicate design for each specific application. Multi-carrier modulation (MCM) which converts single high-rate symbol stream into parallel low-rate streams prolongs the symbol period and mitigates the IS1 in nature. A multirate MCM transmission system based on octave-band filter banks was proposed to provide multimedia services with graceful variation in quality of services from high-tier mobile communication to indoor wireless communication. In this paper, the performance analysis of the multirate transmission system is studied. By considering the proposed system a wavelet domain multirate system, the system performance is modeled and simulated. Models derived in this paper is useful for further improvement of the multirate transmission system.