Bandwidth scaling for fading multipath channels
Top Cited Papers
- 7 August 2002
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Information Theory
- Vol. 48 (4) , 840-852
- https://doi.org/10.1109/18.992769
Abstract
We show that very large bandwidths on fading multipath channels cannot be effectively utilized by spread-spectrum systems that (in a particular sense) spread the available power uniformly over both time and frequency. The approach is to express the input process as an expansion in an orthonormal set of functions each localized in time and frequency. The fourth moment of each coefficient in this expansion is then uniformly constrained. We show that such a constraint forces the mutual information to 0 inversely with increasing bandwidth. Simply constraining the second moment of these coefficients does not achieve this effect. The results suggest strongly that conventional direct-sequence code-division multiple-access (CDMA) systems do not scale well to extremely large bandwidths. To illustrate how the interplay between channel estimation and symbol detection affects capacity, we present results for a specific channel and CDMA signaling scheme.Keywords
This publication has 19 references indexed in Scilit:
- Bound on mutual information for DS-CDMA spreading over independent fading channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Bandwidth scaling for fading channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Broad-band fading channels: signal burstiness and capacityIEEE Transactions on Information Theory, 2002
- Capacity and reliability function for small peak signal constraintsIEEE Transactions on Information Theory, 2002
- Capacity and mutual information of wideband multipath fading channelsIEEE Transactions on Information Theory, 2000
- Capacity of a mobile multiple-antenna communication link in Rayleigh flat fadingIEEE Transactions on Information Theory, 1999
- On the capacity of a cellular CDMA systemIEEE Transactions on Vehicular Technology, 1991
- Channels with block interferenceIEEE Transactions on Information Theory, 1984
- Coding Theorem for Stationary, Asymptotically Memoryless, Continuous-time ChannelsThe Annals of Mathematical Statistics, 1972
- The Effect of Frequency Selective Fading on the Binary Error Probabilities of Incoherent and Differentially Coherent Matched Filter ReceiversIEEE Transactions on Communications, 1963