Abstract
We consider multi-carrier transmission through a frequency-selective fading channel with limited feedback. An on-off power allocation activates the set of sub-channels with gains above a threshold. We model the sequence of sub-channel gains as a Markov process, and give a lower bound on the feedback rate in bits per sub-channel needed to specify the sequence of activated sub-channels as a function of the activation threshold. Optimizing the threshold gives the same asymptotic growth in capacity as optimal water-filling as the number of sub-channels N goes to infinity. If the ratio of coherence bandwidth to the total available bandwidth is fixed, then the ratio between minimum feedback rates with correlated and i.i.d, sub-channels, respectively, converges to zero with N. For a sequence of Rayleigh fading sub-channels, which are modeled as a first-order autoregressive process, the ratio goes to zero as O (√log N/N) with the optimized threshold. We also consider finite-precision rate control on each sub-channel, and show that the feedback rate required to specify the sequence of assigned rate levels across sub-channels gives the same asymptotic increase in achievable rate with N as the (infinite-precision) on-off power allocation.
| Original language | English (US) |
|---|---|
| Pages | 1628-1632 |
| Number of pages | 5 |
| State | Published - Dec 1 2003 |
| Event | IEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States Duration: Dec 1 2003 → Dec 5 2003 |
Other
| Other | IEEE Global Telecommunications Conference GLOBECOM'03 |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 12/1/03 → 12/5/03 |
Fingerprint
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Global and Planetary Change
Cite this
}
Minimum Feedback Rates for Multi-Carrier Transmission with Correlated Frequency-Selective Fading. / Sun, Yakun; Honig, Michael L.
2003. 1628-1632 Paper presented at IEEE Global Telecommunications Conference GLOBECOM'03, San Francisco, CA, United States.Research output: Contribution to conference › Paper
TY - CONF
T1 - Minimum Feedback Rates for Multi-Carrier Transmission with Correlated Frequency-Selective Fading
AU - Sun, Yakun
AU - Honig, Michael L
PY - 2003/12/1
Y1 - 2003/12/1
N2 - We consider multi-carrier transmission through a frequency-selective fading channel with limited feedback. An on-off power allocation activates the set of sub-channels with gains above a threshold. We model the sequence of sub-channel gains as a Markov process, and give a lower bound on the feedback rate in bits per sub-channel needed to specify the sequence of activated sub-channels as a function of the activation threshold. Optimizing the threshold gives the same asymptotic growth in capacity as optimal water-filling as the number of sub-channels N goes to infinity. If the ratio of coherence bandwidth to the total available bandwidth is fixed, then the ratio between minimum feedback rates with correlated and i.i.d, sub-channels, respectively, converges to zero with N. For a sequence of Rayleigh fading sub-channels, which are modeled as a first-order autoregressive process, the ratio goes to zero as O (√log N/N) with the optimized threshold. We also consider finite-precision rate control on each sub-channel, and show that the feedback rate required to specify the sequence of assigned rate levels across sub-channels gives the same asymptotic increase in achievable rate with N as the (infinite-precision) on-off power allocation.
AB - We consider multi-carrier transmission through a frequency-selective fading channel with limited feedback. An on-off power allocation activates the set of sub-channels with gains above a threshold. We model the sequence of sub-channel gains as a Markov process, and give a lower bound on the feedback rate in bits per sub-channel needed to specify the sequence of activated sub-channels as a function of the activation threshold. Optimizing the threshold gives the same asymptotic growth in capacity as optimal water-filling as the number of sub-channels N goes to infinity. If the ratio of coherence bandwidth to the total available bandwidth is fixed, then the ratio between minimum feedback rates with correlated and i.i.d, sub-channels, respectively, converges to zero with N. For a sequence of Rayleigh fading sub-channels, which are modeled as a first-order autoregressive process, the ratio goes to zero as O (√log N/N) with the optimized threshold. We also consider finite-precision rate control on each sub-channel, and show that the feedback rate required to specify the sequence of assigned rate levels across sub-channels gives the same asymptotic increase in achievable rate with N as the (infinite-precision) on-off power allocation.
UR - http://www.scopus.com/inward/record.url?scp=0842310821&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0842310821&partnerID=8YFLogxK
M3 - Paper
SP - 1628
EP - 1632
ER -