A PN-acquisition ASIC for wireless CDMA systems

C. Deng, C. Chien
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引用次数: 1

Abstract

CDMA spread-spectrum systems require PN-acquisition to synchronize the transmitted signal at the receiver. Fast acquisition minimizes the amount of synchronization overhead required in the communication link for maximum system throughput. Yet, the fast acquisition should be done with low energy for portable applications. Conventional acquisition techniques using matched filters or serial correlators alone provide either fast pseudo-noise (PN) acquisition for CDMA or low power dissipation but not both. This paper presents an ASIC which implements a hybrid PN acquisition architecture that achieves both fast acquisition and up to 50% reduction in energy dissipation compared to conventional techniques. This ASIC has been fabricated using 0.5-/spl mu/m CMOS technology with an area of 23 mm. It operates at 20 MHz with a 3.3 V supply and dissipates 50 mW per acquisition, or less than 1.5 mW per 50 byte packet.
一种用于无线CDMA系统的pn采集ASIC
CDMA扩频系统需要pn采集来同步接收端发送的信号。快速采集最大限度地减少了通信链路中所需的同步开销,以实现最大的系统吞吐量。然而,对于便携式应用来说,快速采集应该以低能量完成。传统的采集技术使用匹配滤波器或串行相关器单独提供快速伪噪声(PN)采集或低功耗,但不能两者兼得。本文提出了一种实现混合PN采集架构的ASIC,与传统技术相比,该架构实现了快速采集和高达50%的能耗降低。该ASIC采用0.5-/spl μ m CMOS技术制造,面积为23 mm。它的工作频率为20mhz,电源为3.3 V,每次采集功耗为50mw,或每50字节数据包功耗小于1.5 mW。
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