Electromagnetic communication among nanosensors using Time-Spread On-Off Keying (TS-OOK) modulation in Terahertz band promises very high transmission rates (up to several Terabits per second). Due to scarce battery capacity in nanosensors, energy efficiency is a very important aspect in nanocommunication, as are also bandwidth expansion, multiuser interference and robustness against transmission errors. This paper compares various low weight codes found in the literature using metrics specific to nanocommunication. A small variation of such a code is also introduced and included in the comparison. Results show that there are trade-offs among the various metrics used and, even if there is no clear winner method, the novel method has good results in almost all metrics.
Terahertz band (0.1-10 THz) provides very large bandwidth, enabling multimedia transmission at short distance. In macro world, ultra broadband communication networks at THz band (TeraNets) provides very large bandwidth for wireless multimedia sensor networks (WMSN). Similarly, recent development in nano-technology (nano-antenna and nano-transceiver) shows that electromagnetic nanocommunications at THz band support very large bandwidth too, which enables the development of wireless multimedia nano-sensor networks (WMNSN). For both WMSN and WMNSN, the major challenges are simple and energy efficient transmission, since the network consists of a large number of nodes with limited battery capacity. In this paper, we propose a simple, energy efficient and robustness-aware image compression for pulse-based WMSN and WMNSN. We investigate the system performance in terms of image quality, energy efficiency, perpetual operation in nanocommunications and transmission robustness against error. The results show that for these networks, with the trade-off of image quality, the proposed method outperforms JPEG, JPEG 2000, GIF and PNG in all used metrics.
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