Computer Science – Information Theory
Scientific paper
2008-02-18
Computer Science
Information Theory
5 pages. Changes from 2nd version: minor corrections. Essentially the paper to be presented at ISWCS 2008 in Reykjavik
Scientific paper
The frequency selectivity of wireless communication channels can be characterized by the delay spread Ds of the channel impulse response. If the delay spread is small compared to the bandwidth W of the input signal, that is, Ds*W approximately equal to 1, the channel appears to be flat fading. For Ds*W >> 1, the channel appears to be frequency selective, which is usually the case for wideband signals. In the first case, small scale synchronization with a precision much higher than the sampling time T = 1/W is crucial. In this paper, it is shown by analytical means that this is different in the wideband regime. Here synchronization with a precision of T is sufficient and small scale synchronization cannot further increase the captured energy at the receiver. Simulation results show that this effect already occurs for W > 50MHz for the IEEE 802.15.4a channel model.
Bielefeld Daniel
Böcherer Georg
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