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Study on the Spread Spectrum Soft Receiver

Author: MaXiaoLong
Tutor: ChenGuiFen
School: Changchun University of Science and Technology
Course: Physical Electronics
Keywords: Spread Spectrum Pseudo noise code Rapid capture Track Detect Phase-locked loop
CLC: TN85
Type: Master's thesis
Year: 2002
Downloads: 246
Quote: 3
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Abstract


This paper describes a software simulation of hardware PCM-CDMA-BPSK IF signal rapid acquisition , tracking and demodulation . The traditional study on the spread spectrum signal is in ideal conditions , such as low bit rate, a narrow dynamic range , and changes in a narrow frequency range, etc. . The rapid acquisition of high dynamic , high bit rate , low signal-to-noise ratio , large Doppler and change the code length and the bit rate of the spread spectrum signal is the difficulty . Requires a smaller delay and a higher probability of the capture process of the spread signal , this article describes a two - dimensional signal acquisition method , this method is combined with the pseudo - PN code and carrier frequency acquisition and capture the large time delay amplitude reduces , in fact, the detection of the spread spectrum signal is the key to the receiving system . This article describes an accumulation of the energy of the new method to improve the signal-to-noise ratio of the input signal so as to improve the detection performance . Receiver reliable tracking signal is captured to ensure successful demodulation is necessary , this article describes a way to improve the phase-locked loop design method , this method uses adaptive parameter and variable bandwidth tracking technology to adjust the input signal to improve the capture and tracking performance . Acquisition and tracking performance indicators : the pseudo-random signal bit rate 1M ~ 5M bit / sec , the code length is 255,511 , the receiver sensitivity is - 118dB signal dynamic range is 70dB upload poplar ± 75kHz , target acquisition in 0.2 seconds .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Receiver equipment, radio Radio
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