Proportional Fair Scheduling for Downlink OFDMA

In this paper, the author studies the sum throughput maximization with proportional fair scheduling (PFS) for downlink orthogonal frequency division multiple access (OFDMA) channels. The author proposes selective multiuser diversity (SMuD) schemes with normalized channel signal-to-noise ratio (n-SNR)-based ranking for user selection at each carrier, and assigns the transmit power to the assigned carriers using either equal power allocation (EPA) or water-filling (WF). The author also proposes a modified absolute channel SNR (a-SNR)-ranking based SMuD scheme, which provides an improved performance than the original a-SNR SMuD scheme. Closed-form throughput and average access probability (AAP) expressions for both n-SNR and a-SNR SMuD schemes with EPA over independent but not necessarily identically distributed (i.n.d.) Rayleigh channels (for different users and carriers) are derived. These results put new insight into the achievable downlink OFDMA performance with proportional fairness and the effects of various system and channel parameters.

[1]  Mohamed-Slim Alouini,et al.  Further results on selective multiuser diversity , 2004, MSWiM '04.

[2]  Srikrishna Bhashyam,et al.  A sub-optimal joint subcarrier and power allocation algorithm for multiuser OFDM , 2005, IEEE Communications Letters.

[3]  Kwang Bok Lee,et al.  Transmit power adaptation for multiuser OFDM systems , 2003, IEEE J. Sel. Areas Commun..

[4]  Mohamed-Slim Alouini,et al.  Performance analysis of multiuser selection diversity , 2004, 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577).

[5]  R. Elliott.  A measure of fairness of service for scheduling algorithms in multiuser systems , 2002, IEEE CCECE2002. Canadian Conference on Electrical and Computer Engineering. Conference Proceedings (Cat. No.02CH37373).

[6]  Adam Wolisz,et al.  Performance analysis of dynamic OFDMA systems with inband signaling , 2006, IEEE Journal on Selected Areas in Communications.

[7]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[8]  R.M. Buehrer,et al.  Wireless communications: past events and a future perspective , 2002, IEEE Communications Magazine.

[9]  C.-C.J. Kuo,et al.  An approximately MAI-free multiaccess OFDM system in carrier frequency offset environment , 2005, IEEE Transactions on Signal Processing.

[10]  Douglas L. Jones,et al.  Computationally efficient optimal power allocation algorithms for multicarrier communication systems , 2000, IEEE Trans. Commun..

[11]  Abbas Jamalipour,et al.  Wireless communications , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[12]  Jun Cai,et al.  Downlink resource management for packet transmission in OFDM wireless communication systems , 2005, IEEE Trans. Wirel. Commun..

[13]  Jeffrey G. Andrews,et al.  Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints , 2005, IEEE Transactions on Wireless Communications.

[14]  Lei Zhao,et al.  WLC20-3: Channel Capacity and Fairness of SNR-Ranking-Based Parallel Multiuser Scheduling , 2006, IEEE Globecom 2006.