Download Channel-adaptive technologies and cross-layer designs for by Vincent K N Lau; Yu-Kwong Ricky Kwok PDF

By Vincent K N Lau; Yu-Kwong Ricky Kwok

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Additional resources for Channel-adaptive technologies and cross-layer designs for wireless systems with multiple antennas : theory and applications

Example text

Devising channel-adaptive routing protocols is a very hot field. We shall provide a detailed survey of existing techniques. We also describe a reactive ad hoc routing algorithm, called RICA (receiver-initiated channel-adaptive) protocol, to intelligently utilize the multirate services (based on different modulation schemes). NS-2 simulation results show that the RICA protocol is highly effective. In conclusion, channel adaptation technologies can benefit all the three layers described above. However, one fundamental requirement for channel adaptation is the knowledge of channel state information (CSI) at the transmitter.

WIRELESS CHANNEL MODELS 15 On the other hand, we can characterize the random channel on the basis of the delay–Doppler spectrum. 21) Since the Doppler spectrum and the time autocorrelation function are Fourier transform pairs, a large Doppler spread s f2 will result in small coherence time Tc and therefore faster temporal fading and vice versa. Similarly, the power-delay profile and the frequency autocorrelation function are Fourier transform pairs. Hence, a large delay spread s t2 will result in a small coherence bandwidth Bc and vice versa.

Hence, a large delay spread s t2 will result in a small coherence bandwidth Bc and vice versa. 3 Frequency–Space Transform Mapping. 6. 6. Illustration of frequency–space autocorrelation and delay–wavenumber spectrum. form pairs. 2, we have introduced the concepts of coherence distance and angle spread for deterministic channels. We shall try to extend the definition of these parameters for WSS-US random channels. 5. Similarly, we can characterize the statistical behavior of the random channels by the delay–wavenumber spectrum SH(t, k).

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