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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Xinying Zhang Kung, S.Y. |
| Copyright Year | 2003 |
| Description | Author affiliation: Princeton Univ., NJ, USA (Xinying Zhang; Kung, S.Y.) |
| Abstract | It is well known that linear MMSE can outperform its zero-forcing counterpart. In combination with a successive interference canceller, MMSE can fully exploit the capacity of MIMO (multiple-input-multiple-output) channels [A.J. Viterbi, 1986, M.K. Varanasi, T. Guess, 1997]. In practice, however, such an advantage is compromised due to its implementation complexity and the requirement of accurate SNR estimate. Thus other equalizers such as zero-forcing may present an attractive alternative as long as the performance gap is tolerable. This motivates a need to quantify the tradeoff between MMSE and zero-forcing in both parallel and sequential structures. In this paper, the capacity performance of different equalization schemes is investigated, with closed-form formulas provided in terms of two key measures: capacity gaps and ratios. We also conclude that the capacity gain via structural choice (between parallel and sequential) far out-weights that via filter choice (between zero-forcing and MMSE). Indeed, the latter is found to be almost negligible for most practical SNR regions. It is also shown that the sequential zero-forcing equalizers can asymptotically reach the channel capacity when SNR approaches infinity, irrelevant of the detection order. Although this paper is focused on the flat-fading channels, the result is directly extendable to the ISI case by slicing the frequency band into infinitesimal stripes, each of which can be treated as flat. |
| Sponsorship | IEEE Signal Process. Soc., Comput. Soc., Circuits & Syst. Soc, Commun. Soc |
| File Size | 252532 |
| File Format | |
| ISBN | 0780379659 |
| DOI | 10.1109/ICME.2003.1221689 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-07-06 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | MIMO Equalizers Interference Filters Channel capacity H infinity control Frequency Mathematical model Receiving antennas Transfer functions |
| Content Type | Text |
| Resource Type | Article |
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