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Spread-spectrum techniques for fiber-fed microcellular networks

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2 Author(s)
Koshy, B.J. ; Adv. Wireless Networks Technol. Res. Group., Telcordia Technol., Red Bank, NJ, USA ; Shankar, P.M.

It is well known that for a specified radio capacity, the peak performance [such as the minimum bit error rate (BER) or probability of outage] of subcarrier multiplexing (SCM)-based fiber-fed microcellular systems is limited by the nonlinearity of the optical source. Conversely, for a specified performance, the maximum radio capacity is restricted by the source nonlinearity. It is the goal of this paper to examine the robustness of a code-division multiple-access (CDMA)-based system in the presence of these nonlinearities. This is done by comparing the error and outage probabilities of a CDMA-based system to that of a conventional SCM system, which utilizes frequency-division multiple access (FDMA). It is shown that a CDMA system can relax the bounds on the performance or capacity. However, this improvement is obtained at the expense of large chunks of bandwidth. An alternative hybrid CDMA/FDMA approach is examined, wherein the inherent benefits of both CDMA and FDMA techniques are utilized. Performance evaluation shows that the hybrid system achieves the same system requirements in a more spectrally efficient manner

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:48 ,  Issue: 3 )

Date of Publication:

May 1999

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