Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 59, Issue 8, Pages 3818-3830Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2010.2060217
Keywords
Channel estimation; fading channel; multicarrier code-division multiple access (MC-CDMA); partial equalization (PE); performance evaluation
Categories
Funding
- FP7 European project OPTIMIX [214625]
- Network of Excellence NEWCOM++
- Engineering and Physical Sciences Research Council [EP/G05178X/1] Funding Source: researchfish
- EPSRC [EP/G05178X/1] Funding Source: UKRI
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Multicarrier code-division multiple access (MC-CDMA) can support high data rates in next-generation multiuser wireless communication systems. Partial equalization (PE) is a low-complexity technique for combining the signals of subcarriers to improve the achievable performance of MC-CDMA systems in terms of their bit error probability (BEP) and bit error outage (BEO) in comparison with maximal ratio combining, orthogonality restoring combining, and equal-gain combining techniques. We analyze the performance of the multiuser MC-CDMA downlink and derive the optimal PE parameter expression, which minimizes the BEP. Realistic imperfect channel estimation and frequency-domain (FD) block-fading channels are considered. More explicitly, the analytical expression of the optimum PE parameter is derived as a function of the number of subcarriers, number of active users (i.e., the system load), mean signal-to-noise ratio (SNR), and variance of the channel-estimation errors for the aforementioned FD block-fading channel. We show that the choice of the optimal PE technique significantly increases the achievable system load for the given target BEP and BEO.
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