Open AccessCode divided multiple access underwater acoustic communication based on active acoustic intensity average
Author(s) -
Jingwei Yin,
Sen Yang,
Pengfei Du,
Yu Yun,
Chaohe Yang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.064302
Subject(s) - directivity , azimuth , computer science , sound intensity , acoustics , intensity (physics) , interference (communication) , underwater , code division multiple access , spread spectrum , telecommunications , physics , optics , sound (geography) , geology , channel (broadcasting) , antenna (radio) , oceanography
Code divided multiple access (CDMA) underwater communication based on single vector sensor is studied in this paper. The most common methods to estimate azimuth with self-directivity of single vector sensor are average sound intensity method and complex sound intensity method, however, for the same frequency band multi-users, these methods are limited to the measurement of azimuths only for two users at the same time theoretically. An active average intensity method, which measures the azimuths of multi-users simultaneously with the excellent correlative characteristics of pseudo-random code in spread spectrum communication, is proposed in this paper. With the estimated azimuth, vector combination can be generated to adjust the directivity of vector sensor, achieve multi-user beam communication, inhibit multi-path interference, and enhance processing gain and lower error rate. Simulation and experiment for same frequency band spread spectrum multi-user communication testify the feasibility and utility of active average sound intensity method.