Design,Analysis, and DSP-Based Implementation of a Code-Phase-Shift Keying Receiver for Wireless Local Area Network Applications

This paper introduces code-phase-shift keying(CPSK), a novel M-ary direct-sequence spread-spectrum(DS-SS) signaling technique that is particularlysuitable for wireless local area network applications. In CPSK, each of the M signaling waveforms isobtained by a different code phase shift of a singlepseudonoise (PN) sequence. It increases the data ratewithout sacrificing spreading gain, and is more power efficient over additive white Gaussian noise(AWGN) than conventional DS-SS signaling methods. Thedesign, analysis, and implementation of a DSP-basedreceiver is presented to demonstrate the practicality of the signaling method. In our design, thereceived IF signal is downconverted into two quadraturebaseband components that are filtered and A/D convertedat 1 MHz into 8-bit samples for processing by three TMS320C40 processors. The tracking andacquisition schemes are adapted from conventional DS-SSreceivers, while the carrier-wave synchronizationproblem is solved by a novel technique calledphase-invariant reception. The design is tested in AWGN andsingle-tone interference environments. Implementationlosses and acquisition performances arequantified.     

一种应用于GPS接收机的全单片CMOS低噪声放大器

采用0.18μm1.8V mixed CMOS工艺设计并实现了一种应用于GPS接收机的CMOS低噪声放大器,采用片内螺旋电感实现输入匹配和单片集成。测试结果表明在1.575GHz时,工作电流8mA,增益20dB,噪声系数小于1.7dB,IIP3为-10dBm。