Unregulated Access Research Articles

Some notes on the misuse of classic writings in economics on the subject of common property

This paper aims to show how many economists have misunderstood the issues and language concerning “the commons”. First, they confuse the noun, “common property”, with the process of free and unregulated access. Second, they explain the disappearance of common-property resources as an unavoidable consequence of individual economic rationality. This process supposedly is based on Adam Smith's use of selfishness, but clearly is a misinterpretation of his basic writings. Ironically, Smith's writings, which, in toto, advocate great legal, political and moral restraint in economic action, are most commonly used to advance opposite ends. Given that planet Earth may be considered a common property, the clarification and proper use of common property issues is of the utmost importance.

A starvation-free access protocol for a full-duplex buffer insertion ring local area network

Abstract Of several existing designs for local area networks, the buffer insertion ring has been shown to provide higher throughputs, lower mean delays and greater spatial reuse than competing designs such as the token ring and slotted ring networks. However, one disadvantage is that the normally unregulated access scheme of the insertion ring allows for the phenomenon of “starvation” — when a network node has to wait too long before it can access the ring. In our work, we demonstrate that starvation is a serious problem and present a protocol to prevent it. It is shown that the new protocol is correct, stable and does not substantially degrade the otherwise efficient operation of the ring.

Optimization of Coded Spread Spectrum System Performance

Error correction coding techniques significantly improve performance of spread spectrum communication systems in environments containing jamming, multipath, and unregulated multiple access. This paper investigates the optimization of spread spectrum system performance for time-varying unknown interference. Noncoherent frequency hopping (FH) spread spectrum modulation, and hybrid FH-PN incorporating a direct sequence PN modulation on each hopped frequency are studied. For FH or FH-PN, the data modulations considered are differential phase-shift-keying (DPSK), differential quadriphase-quadriphase-shift-keying (DQPSK), and multiple-frequency-multiple-frequency-shift-keying (MFSK). Both block and convolutional error correction coding techniques are studied as a means of improving the spread spectrum performance.