Abstract
In the uplink transmission of a cellular system, multi-access interference (MAI) is a big problem. To eliminate the MAI, in this paper, a new multi-carrier-code division multiple access using phase rotation (PR/MC-CDMA) is proposed. In the proposed method, each user's data symbol is spread using a user-specific phase-rotated spreading code. The user-specific phase rotation is set so that the transmitted symbols are not overlapped in the delay time domain and the MAI can be completely removed through the despreading process at a receiver. At the receiver, the received signal in the frequency domain is multiplied by the inverse phase rotation based on the path-specific time delay. The transmitted signals received via different propagation paths are obtained by despreading using the use-specific phase rotated spreading code. They are coherently combined using the maximum ratio combining (MRC) method. The bit error rate (BER) performance of the proposed PR/MC-CDMA is evaluated by computer simulation and is compared to that of the conventional MC-CDMA.
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Adachi, K., Nakagawa, M. (2009). Phase Rotation/MC-CDMA for Uplink Transmission. In: Plass, S., Dammann, A., Kaiser, S., Fazel, K. (eds) Multi-Carrier Systems & Solutions 2009. Lecture Notes in Electrical Engineering, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2530-2_31
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DOI: https://doi.org/10.1007/978-90-481-2530-2_31
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-2529-6
Online ISBN: 978-90-481-2530-2
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