The OFDMA/TDD System based on Transmit and Receive Beamforming Utilizing the Preamble for Receive Beamforming 


Vol. 30,  No. 9, pp. 749-754, Sep.  2005


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  Abstract

It is well-known that mobile communication systems are usually limited in their performance and capacity by three major impairments, which are multipath fading, delay spread and co-channel interference (CCI). OFDMA (OFDM-FDMA) system can cope with the multipath fading and delay spread easily due to the beneficial properties of OFDM technology. Though OFDMA scheme avoids intra-cell interference using the orthogonality among subcarriers, the scheme contains difficulty of reducing co-channel interference. Therefore, in this paper, adaptive antenna techniques are deployed into OFDMA/TDD system to minimize the co-channel interference induced by adjacent cells and to enhance the uplink performance. For the improvement of downlink performance, we apply TxAA (Transmit Adaptive Array), a kind of transmit diversity technique, utilizing preamble symbols for training antenna array into OFDMA/TDD transmitter side. Simulation results show that the uplink and downlink performance under multipath Rayleigh fading channel improved 9dB and 7dB each compared with the case of single antenna system at target BER 10^(-3).

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  Cite this article

[IEEE Style]

J. Heo and K. Chang, "The OFDMA/TDD System based on Transmit and Receive Beamforming Utilizing the Preamble for Receive Beamforming," The Journal of Korean Institute of Communications and Information Sciences, vol. 30, no. 9, pp. 749-754, 2005. DOI: .

[ACM Style]

Joo Heo and KyungHi Chang. 2005. The OFDMA/TDD System based on Transmit and Receive Beamforming Utilizing the Preamble for Receive Beamforming. The Journal of Korean Institute of Communications and Information Sciences, 30, 9, (2005), 749-754. DOI: .

[KICS Style]

Joo Heo and KyungHi Chang, "The OFDMA/TDD System based on Transmit and Receive Beamforming Utilizing the Preamble for Receive Beamforming," The Journal of Korean Institute of Communications and Information Sciences, vol. 30, no. 9, pp. 749-754, 9. 2005.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880