Weng, Ching-Chih and Chen, Chun-Yang and Vaidyanathan, P. P. (2010) MIMO Transceivers With Decision Feedback and Bit Loading: Theory and Optimization. IEEE Transactions on Signal Processing, 58 (3). pp. 1334-1346. ISSN 1053-587X http://resolver.caltech.edu/CaltechAUTHORS:20100226-142809479
- Published Version
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20100226-142809479
This paper considers MIMO transceivers with linear precoders and decision feedback equalizers (DFEs), with bit allocation at the transmitter. Zero-forcing (ZF) is assumed. Considered first is the minimization of transmitted power, for a given total bit rate and a specified set of error probabilities for the symbol streams. The precoder and DFE matrices are optimized jointly with bit allocation. It is shown that the generalized triangular decomposition (GTD) introduced by Jiang, Li, and Hager offers an optimal family of solutions. The optimal linear transceiver (which has a linear equalizer rather than a DFE) with optimal bit allocation is a member of this family. This shows formally that, under optimal bit allocation, linear and DFE transceivers achieve the same minimum power. The DFE transceiver using the geometric mean decomposition (GMD) is another member of this optimal family, and is such that optimal bit allocation yields identical bits for all symbol streams—no bit allocation is necessary—when the specified error probabilities are identical for all streams. The QR-based system used in VBLAST is yet another member of the optimal family and is particularly well-suited when limited feedback is allowed from receiver to transmitter. Two other optimization problems are then considered: a) minimization of power for specified set of bit rates and error probabilities (the QoS problem), and b) maximization of bit rate for fixed set of error probabilities and power. It is shown in both cases that the GTD yields an optimal family of solutions.
|Additional Information:||© 2010 IEEE. Manuscript received December 09, 2008; accepted September 08, 2009. First published September 29, 2009; current version published February 10, 2010. This work was supported in part by the Office of Naval Researc (ONR) under Grant N00014-08-1-0709 and in part by the TMS scholarship 94-2-A-018 of the National Science Council of R. O. C., Taiwan. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Anna Scaglione.|
|Subject Keywords:||BER optimization, bit allocation, decision feed-back equalizers, generalized triangular decomposition, limited feedback, MIMO transceivers|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||02 Mar 2010 23:24|
|Last Modified:||26 Dec 2012 11:48|
Repository Staff Only: item control page