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Impact of Imperfect Channel Estimation on the Performance of M-QAM Hierarchical Constellations with Diversity | IEEE Conference Publication | IEEE Xplore

Impact of Imperfect Channel Estimation on the Performance of M-QAM Hierarchical Constellations with Diversity


Abstract:

In this paper we derive general expressions for the performance of hierarchical multilevel quadrature amplitude modulation constellations (M-QAM), over flat Rayleigh fadi...Show More

Abstract:

In this paper we derive general expressions for the performance of hierarchical multilevel quadrature amplitude modulation constellations (M-QAM), over flat Rayleigh fading environments with imperfect channel estimation. Cases of diversity reception with identical channels and with dissimilar channels, employing maximal ratio combining (MRC) are considered. Since hierarchical constellations are usually employed to achieve unequal bit error protection, the individual bit error rate (BER) of each bit stream is analyzed and it is shown that poor channel estimation has a more severe impact in the performance of the least protected bit streams.
Date of Conference: 13-16 August 2007
Date Added to IEEE Xplore: 24 September 2007
ISBN Information:
Print ISSN: 1095-2055
Conference Location: Honolulu, HI, USA

References

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