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Capacity and power allocation for fading MIMO channels with channel estimation error (2006)
| Content Provider | CiteSeerX |
|---|---|
| Author | Yoo, Taesang Goldsmith, Andrea |
| Abstract | We investigate the effect of channel estimation error on the capacity of multiple input multiple output (MIMO) fading channels. We study lower and upper bounds of mutual information under channel estimation error, and show that the two bounds are tight for Gaussian inputs. Assuming Gaussian inputs we also derive tight lower bounds of ergodic and outage capacities and optimal transmitter power allocation strategies that achieve the bounds under perfect feedback. For the ergodic capacity, the optimal strategy is a modified waterfilling over the spatial (antenna) and temporal (fading) domains. This strategy is close to optimum under small feedback delays, but when the delay is large, equal powers should be allocated across spatial dimensions. For the outage capacity, the optimal scheme is a spatial waterfilling and temporal truncated channel inversion. Numerical results show that some capacity gain is obtained by spatial power allocation. Temporal power adaptation, on the other hand, gives negligible gain in terms of ergodic capacity, but greatly enhances outage performance. |
| File Format | |
| Journal | Transaction A: Civil Engineering, Scientia Iranica |
| Publisher Date | 2006-01-01 |
| Access Restriction | Open |
| Subject Keyword | Multiple Input Multiple Output Mutual Information Upper Bound Small Feedback Delay Gaussian Input Negligible Gain Optimal Scheme Power Allocation Perfect Feedback Numerical Result Outage Capacity Channel Inversion Temporal Power Adaptation Fading Channel Spatial Dimension Optimal Transmitter Power Allocation Strategy Capacity Gain Equal Power Spatial Waterfilling Optimal Strategy Outage Performance Modified Waterfilling Mimo Channel Spatial Power Allocation Ergodic Capacity Channel Estimation Error |
| Content Type | Text |
