Title :
Rateless Codes for MIMO Channels
Author :
Shanechi, Maryam Modir ; Erez, Uri ; Wornell, Gregory W.
Author_Institution :
Dept. EECS, MIT Cambridge, Cambridge, MA
Abstract :
Two rateless code constructions are developed for efficient communication over multi-input multi-output (MIMO) Gaussian channels. The key ingredients in both architectures are layering, dithering, and repetition. Both employ successive cancellation decoding along with minimum mean-square error (MMSE) combining and convert the MIMO channel into a scalar channel to which classical Gaussian base codes can be applied. The first construction based on simple layering induces an additive white Gaussian noise (AWGN) scalar channel and with perfect base codes achieves a substantial efficiency gain over a baseline repetition scheme. At typical spectral efficiencies, this scheme can achieve better than 85% of capacity for a rateless construction with two effective rates. The second construction which uses a diagonal layering (DL) structure is capacity achieving at any SNR and induces a particular time-varying scalar channel. This holds even if the MIMO channel is block constant but time-varying.
Keywords :
AWGN channels; MIMO communication; channel capacity; channel coding; decoding; least mean squares methods; time-varying channels; AWGN; MIMO; MMSE; additive white Gaussian noise scalar channel; channel capacity; diagonal layering structure; minimum mean-square error method; multiinput multioutput Gaussian channel; perfect base code; rateless code; simple layering structure; successive cancellation decoding; time-varying scalar channel; AWGN; Additive white noise; Channel state information; Code standards; Decoding; Gaussian channels; MIMO; OFDM; Redundancy; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2008. IEEE GLOBECOM 2008. IEEE
Conference_Location :
New Orleans, LO
Print_ISBN :
978-1-4244-2324-8
DOI :
10.1109/GLOCOM.2008.ECP.697
