Cart (Loading....) | Create Account
Close category search window
 

Analysis and Optimization of Diagonally Layered Lattice Schemes for MIMO Fading Channels

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)

Embodiments of the diagonal Bell Laboratories layered space-time (D-BLAST) architecture for multiple-input-multiple-output (MIMO) communication are developed wherein information symbol vectors are encoded using codewords from a lattice code [called a diagonally layered lattice (DLL) code], which are formatted onto the diagonals of a space-time frame. Decoding is done using a sphere decoder for each diagonal based on soft statistics obtained after zero forcing (ZF) or minimum-mean-square-error (MMSE) filtering and decision feedback. These operations give rise to an effective parallel channel model with channel gains with nonidentical statistics and additive noise which is Gaussian in the ZF-filtering case and non-Gaussian in the MMSE-filtering case. The so-called full modulation diversity (FMD) property is nevertheless shown to yield the maximum achievable diversity orders over the MIMO channel for both the ZF- and the MMSE-filtering-based decoders respectively, for any arbitrary fading distribution. In the case of the independent, identically distributed (i.i.d.) Rayleigh fading MIMO channel with K-transmit and N-receive antennas (with NgesK), these diversity orders are NK-K(K-1)/2 and NK for ZF- and MMSE-filtering-based decoding, respectively. The error probability analysis also yields a design criterion for optimizing transmit power allocations. Several lattice design methods are proposed for the effective parallel channel models. Two methods are proposed to achieve high coding gain in the Rayleigh fading MIMO channel; a third method is proposed that minimizes the exact symbol error probability (SEP) and can be tailored for any given fading distribution. A novel soft decision feedback decoder is also proposed based on the list sphere decoder to mitigate error propagation due to hard decision feedback. The salient feature of the proposed DLL schemes is that they have nearly full rate and full (or high) diversi- - ty order and yet a much lower decoding complexity than other existing full rate, full diversity space-time block codes (STBCs). The frame error probability (FEP) performance of the optimized DLL schemes for moderate-to-high spectral efficiencies and a wide range of signal-to-noise ratios (SNRs) can be quite close to the performance of the best performing, but more complex to decode, STBCs. Moreover, the proposed DLL schemes significantly outperform other existing MIMO systems of comparable decoding complexity.

Published in:

Information Theory, IEEE Transactions on  (Volume:54 ,  Issue: 3 )

Date of Publication:

March 2008

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.