Interference Analysis and Mitigation for Time-Asynchronous OFDM CoMP Systems
| Autor: | Jon W. Mark, Ahmed M. Hamza, Essam Sourour |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Computer science
Orthogonal frequency-division multiplexing Applied Mathematics 020206 networking & telecommunications 020302 automobile design & engineering Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology Interference (wave propagation) Upper and lower bounds Synchronization Computer Science Applications Cyclic prefix 0203 mechanical engineering Interference (communication) Asynchronous communication Telecommunications link 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering Computer Science::Information Theory Communication channel Rayleigh fading |
| Zdroj: | IEEE Transactions on Wireless Communications. 17:4780-4791 |
| ISSN: | 1558-2248 1536-1276 |
| DOI: | 10.1109/twc.2018.2831681 |
| Popis: | One of the major challenges, which prevents the coordinated multipoint (CoMP) communications concept from being widely deployed in new cellular systems, is timing synchronization. In order to achieve the gains promised by CoMP systems, the user equipment’s signals in uplink (UL) or the base stations’ signals in downlink should be synchronized, such that the time difference of arrivals do not exceed the cyclic prefix length of the transmitted signals; otherwise, the system suffers from unavoidable integer time offsets. These offsets lead to asynchronous interference in terms of inter-carrier, inter-block, and inter-symbol interference. This limits the percentage of area within a cell which can be covered by cooperation and imposes an upper bound on this area. In this paper, we investigate this problem in the UL, and by using geometrical and semi-analytical approaches, we define this upper bound. Also, by characterizing an accurate mathematical model for the asynchronous interference in Rayleigh fading channels, we were able to employ a standard MMSE-based receiver that mitigates this interference. Furthermore, a typical joint channel and delay estimation block is incorporated into the receiver to examine its performance with estimation errors. |
| Databáze: | OpenAIRE |
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