Pilot-Assisted Channel Estimation for the Downlink of the UMTS-TDD Component
| Autor: | U. Mengali, Michele Morelli, A. Masciarelli |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
universal mobile telecommunications system (UMTS)
Code division multiple access Computer science Channel estimation Duplex (telecommunications) Estimator Cramer–Rao bound (CRB) Interference (wave propagation) Multiuser detection downlink Time-division multiplexing Telecommunications link Computer Science::Networking and Internet Architecture Electronic engineering Electrical and Electronic Engineering Multipath propagation UMTS frequency bands Computer Science::Information Theory Communication channel |
| Zdroj: | IEEE Transactions on Communications. 52:595-604 |
| ISSN: | 0090-6778 |
| DOI: | 10.1109/tcomm.2004.826371 |
| Popis: | The time-division duplex (TDD) component of the universal mobile telecommunications system (UMTS) employs synchronous code-division multiple-access techniques with orthogonal spreading codes to provide protection against cochannel interference. In the presence of multipath propagation, however, the code orthogonality is lost and multiaccess interference is generated at the receiver. In such conditions, an estimate of the channel impulse response is required for reliable detection. In this paper, we propose and compare two pilot-assisted schemes for channel estimation in the downlink of the UMTS-TDD system. Both algorithms also provide estimates of the users' energies, which are needed to perform multiuser detection. Theoretical analysis and computer simulations are used to assess the channel estimation performance in terms of mean-squared errors and bit-error rate. It is shown that the accuracy of the proposed estimators attains the Cramer-Rao bound at intermediate/high signal-to-noise ratios. |
| Databáze: | OpenAIRE |
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