Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Multichannel Baseband Processor for Wideband CDMA | EURASIP Journal on Applied Signal Processing 2005 11 1753-1768 2005 Hindawi Publishing Corporation Multichannel Baseband Processor for Wideband CDMA Louay M. A. Jalloul Infineon Technologies 1730 North First Street San Jose CA 95112 USA Email lj07@ Jim Lin Infineon Technologies 1730 North First Street San Jose CA 95112 USA Email jlin@ Received 12 March 2004 Revised 1 December 2004 The system architecture of the cellular base station modem engine CBME is described. The CBME is a single-chip multichannel transceiver capable of processing and demodulating signals from multiple users simultaneously. It is optimized to process different classes of code-division multiple-access CDMA signals. The paper will show that through key functional system partitioning tightly coupled small digital signal processing cores and time-sliced reuse architecture CBME is able to achieve a high degree of algorithmic flexibility while maintaining efficiency. The paper will also highlight the implementation and verification aspects of the CBME chip design. In this paper wideband CDMA is used as an example to demonstrate the architecture concept. Keywords and phrases CDMA chip-rate processing symbol-rate processing micro-DSP multipath RAKE. 1. INTRODUCTION Code-division multiple access CDMA is the physical layer access method used in third-generation 3G mobile radio systems 1 . 3G systems have improved receiver performance over any of the current cellular systems due to the introduction of several new physical layer techniques such as coherent demodulation 2 and turbo codes 3 just to name a few. Relative to the second-generation 2G standards 4 3G systems are also designed for both voice and high-speed data. The wideband CDMA 3G technology uses larger bandwidth and a higher chip-rate than the 2G CDMA counterpart 4 . Furthermore 3G standards are evolving to support additional features such high-speed downlink packet access enhanced uplink dedicated channel and .
