SIMULATION STUDY ON PERFORMANCE OF 915MHZ DIRECT SEQUENCE SPREAD SPECTRUM SYSTEM IN MAIZE FIELDS
In terms of wireless sensor networks (WSN) for agricultural applications, whether the transceiver using Direct Sequence Spread Spectrum (DSSS) technology can meet the requirements of cropland environments needs further investigation. Using Simulink, the DSSS system with the wireless channel in cropland environments was simulated. The clustered Rayleigh model was adopted for multipath fading, which was modified from the Saleh-Valenzuela model, and large-scale path loss model was obtained from the field test data in the cropland with maize in mature growth stage. It is found that the small-scale multipath fading affects the system performance greatly, and the DSSS system could compensate the effect of multipath fading to a certain extent. However, in the cropland with severe multipath fading phenomena, the compensation capacity is limited, and the system performance is only good (BER < 5％) within short transmission range (< 80m). It is very hard to meet the requirements of wireless sensor networks for agricultural information acquisition in wide-area croplands. Although spread spectrum technology has been widely employed in the design of WSN nodes, it is not an optimal solution for the agricultural applications in croplands with worse transmission environments.
wireless sensor networks multipath fading simulation cropland environment direct sequence spread spectrum rake receiver
Lianjiang Chi Hongju Gao Yurui Sun
College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,P. R. China
国际会议
北京
英文
1-6
2009-10-14（万方平台首次上网日期，不代表论文的发表时间）