Estimate of Passive Time Reversal Communication Performance in Shallow Water
- Title
- Estimate of Passive Time Reversal Communication Performance in Shallow Water
- Author
- 최지웅
- Keywords
- underwater acoustic communication; passive time reversal; q-function; E-q; UNDERWATER ACOUSTIC COMMUNICATIONS; EXPERIMENT KAUAIEX; PHASE CONJUGATION; DATA-TRANSMISSION; CHANNELS; VARIABILITY; EQUALIZATION; DIVERSITY
- Issue Date
- 2018-01
- Publisher
- MDPI AG
- Citation
- APPLIED SCIENCES-BASEL, v. 8, No. 1, Article no. 23
- Abstract
- Time reversal processes have been used to improve communication performance in the severe underwater communication environment characterized by significant multipath channels by reducing inter-symbol interference and increasing signal-to-noise ratio. In general, the performance of the time reversal is strongly related to the behavior of the q-function, which is estimated by a sum of the autocorrelation of the channel impulse response for each channel in the receiver array. The q-function depends on the complexity of the communication channel, the number of channel elements and their spacing. A q-function with a high side-lobe level and a main-lobe width wider than the symbol duration creates a residual ISI (inter-symbol interference), which makes communication difficult even after time reversal is applied. In this paper, we propose a new parameter, E-q, to describe the performance of time reversal communication. E-q is an estimate of how much of the q-function lies within one symbol duration. The values of E-q were estimated using communication data acquired at two different sites: one in which the sound speed ratio of sediment to water was less than unity and one where the ratio was higher than unity. Finally, the parameter E-q was compared to the bit error rate and the output signal-to-noise ratio obtained after the time reversal operation. The results show that these parameters are strongly correlated to the parameter E-q.
- URI
- https://www.mdpi.com/2076-3417/8/1/23/htmhttps://repository.hanyang.ac.kr/handle/20.500.11754/80952
- ISSN
- 2076-3417
- DOI
- 10.3390/app8010023
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML