Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7w62fc216

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  • There has been tremendous technological advancement in the area of high-speed indoor wireless local area networks (WLAN's) in recent years. All the existing tech- nologies such as IEEE 802.11a,b are bandwidth limited and high powered systems. The challenge any wireless technology faces is to minimize both the power consumption and the cost (implementation and bandwidth). The capacity of these systems is governed by the shannon's capacity theorem, C=Blog2 (1+SNR) where B is the available band- width and SNR is the signal-to-noise power ratio. If the technology is not limited by bandwidth, it is possible to achieve capacities close to the shannon's limit. Ultra- Wideband (UWB) is a technology which spans the entire frequency spectrum (dedicated and unlicensed). It is capable of achieving high data rates over short distances with low power consumption. This thesis analyzes the error performance of a UWB system with pulse position modulation (PPM) for data modulation and direct sequence (DS) spreading for multiple access over indoor lognormal fading channels. A RAKE receiver is used to combine a subset of the resolvable multipath components using the maximal ratio combining technique. Inter-path and multiple access interferences are modeled and incorporated into the bit error rate (BER) expressions. Performance of the optimally- spaced and orthogonal signaling schemes are compared. Some effects of non-idealities in the receiver signal processing are briefly described.
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