Throughput optimization of precoded OFDM with hierarchical modulation

This paper investigates the throughput optimization of precoded Orthogonal Frequency Division Multiplexing (OFDM) with hierarchical modulation. Using the asymptotic analysis approach we derive the limit bit error rate (BER) of the high priority and the low priority streams. We then use the effective Signal to Interference plus Noise Ratio (SINR) corresponding to each stream to calculate the aggregate throughput achieved by the system. We study the behavior of the throughput as a function of the two design parameters: the coding rate and the constellation ratio. Simulation results show that the asymptotic expressions provide a very good approximation of the BER and that the throughput can be maximized by choosing appropriate values for the design parameters. We conclude on when it is advantageous to use hierarchical modulation and on the optimal values of the constellation ratio and the coding rate to be used for each Signal to Noise Ratio (SNR).

[1]  Antonia Maria Tulino,et al.  Random Matrix Theory and Wireless Communications , 2004, Found. Trends Commun. Inf. Theory.

[2]  Shlomo Shamai,et al.  Spectral Efficiency of CDMA with Random Spreading , 1999, IEEE Trans. Inf. Theory.

[3]  Ralf R. Müller,et al.  MIMO channel modeling and the principle of maximum entropy , 2005, IEEE Transactions on Information Theory.

[4]  J. W. Silverstein,et al.  On the empirical distribution of eigenvalues of a class of large dimensional random matrices , 1995 .

[5]  Philippe Loubaton,et al.  Asymptotic Analysis of Reduced-Rank Chip-Level MMSE Equalizers in the Downlink of CDMA Systems , 2004, IEEE Transactions on Signal Processing.

[6]  Giuseppe Caire,et al.  How fading affects CDMA: an asymptotic analysis with linear receivers , 2001, IEEE J. Sel. Areas Commun..

[7]  Paul A. Wilford,et al.  A hierarchical modulation for upgrading digital broadcast systems , 2005, IEEE Transactions on Broadcasting.

[8]  H. Vincent Poor,et al.  Probability of error in MMSE multiuser detection , 1997, IEEE Trans. Inf. Theory.

[9]  K. Fazel.  Performance of CDMA/OFDM for mobile communication system , 1993, Proceedings of 2nd IEEE International Conference on Universal Personal Communications.

[10]  David Tse,et al.  Linear Multiuser Receivers: Effective Interference, Effective Bandwidth and User Capacity , 1999, IEEE Trans. Inf. Theory.

[11]  John M. Shea,et al.  Nonuniform phase-shift-key modulation for multimedia multicast transmission in mobile wireless networks , 1999, IEEE J. Sel. Areas Commun..

[12]  Philippe Loubaton,et al.  MMSE analysis of certain large isometric random precoded systems , 2003, IEEE Trans. Inf. Theory.

[13]  Emanuele Viterbo,et al.  Signal Space Diversity: A Power- and Bandwidth-Efficient Diversity Technique for the Rayleigh Fading Channel , 1998, IEEE Trans. Inf. Theory.