We demonstrate, for the first time, an error-free, 320-Gb/s optical code division multiple access (O-CDMA) network testbed employing the spectral phase encoded time spreading (SPECTS) technique. Results with and without forward error correction (FEC) are presented. © 2006 Optical Society of America OCIS codes: (060.2330) Fiber optics communications; (999.9999) Optical code division multiple access

Wavelet theory has emerged as a new mathematical tool that can be applied in many fields such as image processing, biomedical engineering, radar, physics, control systems and communication systems. The important area of application of wavelets in communication: multiple accesses. Among the multiple access applications one of the most notable work is wavelet packet-based multiple access communic...

The use of Code Division for Multiple Access or CDMA is well established. We know that it has advantages in multipath environment and increase in capacity due to sectoring antenna and voice activity factor. Here a step by step comparison is made among Frequency Division Multiple Access, Time Division Multiple Access and Code Division Multiple Access when capacity or SNR is of main concern. A de...

A hierarchical time division multiple access (HTDMA) medium access control (MAC) protocol is proposed for clustered mobile underwater acoustic networks. HTDMA consists of two TDMA scheduling protocols (i.e., TDMA1 and TDMA2) in order to accommodate mobile underwater nodes (UNs). TDMA1 is executed among surface stations (e.g., buoys) using terrestrial wireless communication in order to share mob...

Single carrier time division multiple access (TDMA) and orthogonal frequency division multiple access (OFDMA) are promising for broadband fixed radio access (FRA) in terms of flexibility, bandwidth-efficiency and implementation cost. Coherent detection of QPSK-symbols requires adaptive equalization. We focus on equalizer adaptation in time-variant frequency-selective FRA-channels in the presenc...

In this paper are introduced fundamentals, characteristics, advantages and disadvantages of Multiple Access (MA) employed as transmission techniques in the Maritime Mobile Satellite Communications (MMSC) between ships and Coast Earth Station (CES) via Geostationary Earth Orbit (GEO) or Not‐GEO satellite constellations. In fixed satellite communication, as a rule, especia...

This paper presents a token-based channel access protocol for wavelength division multiplexed optically interconnected multiprocessors. Our empirical study of access protocols based on slotted time division multiplexed data and control channels reveals that such protocols typically suffer from excessive slot synchronization latency due to static slot preallocation. The proposed token-based time...