TR2011-014

Capacity, MSE and Secrecy Analysis of Linear Block Precoding for Distributed Antenna Systems in Multi-User Frequency-Selective Fading Channels


    •  Koike-Akino, T.; Molisch, A.F.; Duan, C.; Tao, Z.; Orlik, P., "Capacity, MSE and Secrecy Analysis of Linear Block Precoding for Distributed Antenna Systems in Multi-User Frequency-Selective Fading Channels", IEEE Transactions on Communications, ISSN: 0090-6773, Vol. 59, No. 3, pp. 888, March 2011.
      BibTeX Download PDF
      • @article{Koike-Akino2011mar,
      • author = {Koike-Akino, T. and Molisch, A.F. and Duan, C. and Tao, Z. and Orlik, P.},
      • title = {Capacity, MSE and Secrecy Analysis of Linear Block Precoding for Distributed Antenna Systems in Multi-User Frequency-Selective Fading Channels},
      • journal = {IEEE Transactions on Communications},
      • year = 2011,
      • volume = 59,
      • number = 3,
      • pages = 888,
      • month = mar,
      • issn = {0090-6773},
      • url = {http://www.merl.com/publications/TR2011-014}
      • }
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  • Research Areas:

    Electronics & Communications, Wireless Communications


Block transmission with cyclic prefix is a promising technique to realize high-speed data rates in frequency-selective fading channels. Many popular linear precoding schemes, including orthogonal frequency-division multiplexing (OFDM), single-carrier (SC) block transmission, and time-reversal (TR), can be interpreted as such a block transmission. This paper presents a unified performance analysis that shows how the optimal precoding strategy depends on the optimization criterion such as capacity, mean-square error, and secrecy. We analyze three variants of TR methods (based on maximum-ratio combining, equal-gain combining and selective combining) and two-types of pre-equalization methods (zero-forcing and minimum mean-square error). As one application of our framework, we derive optimal precoding (i.e., OFDM with optimal power and phase control) in the presence of interference limitation for distributed antenna systems; we find that without power/phase control, OFDM does not have any capacity advantage over SC transmissions. When comparing SC and TR, we verify that for single-antenna systems in the high SNR regimes, SC has a capacity advantage; however, TR performs better in the low SNR regime. For distributed multiple-antenna systems, TR always provides higher capacity, and the capacity of TR can approach that of optimal precoders with a large number of distributed antennas. Furthermore, we make an analysis of secrecy capacity which shows how high-rate messages can be transmitted towards an intended user without being decoded by the other users from the viewpoint of information-theoretic security. We demonstrate that TR precoding can be the best candidate among the non-optimal precoders for achieving high secrecy capacity, while the optimal precoder offers a significant gain over those non-optimal precoders.