Open AccessAdaptive Channel‐Matched Extended Alamouti Space‐Time Code Exploiting Partial Feedback
Author(s) -
Badic Biljana,
Rupp Markus,
Weinrichter Hans
Publication year - 2004
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.04.0703.0006
Subject(s) - diversity gain , block code , fading , channel state information , mimo , rayleigh fading , transmit diversity , computer science , transmitter , algorithm , space–time code , electronic engineering , space–time block code , antenna diversity , channel (broadcasting) , telecommunications , decoding methods , engineering , wireless
Since the publication of Alamouti's famous space‐time block code, various quasi‐orthogonal space‐time block codes (QSTBC) for multi‐input multi‐output (MIMO) fading channels for more than two transmit antennas have been proposed. It has been shown that these codes cannot achieve full diversity at full rate. In this paper, we present a simple feedback scheme for rich scattering (flat Rayleigh fading) MIMO channels that improves the coding gain and diversity of a QSTBC for 2 n ( n = 3, 4,…) transmit antennas. The relevant channel state information is sent back from the receiver to the transmitter quantized to one or two bits per code block. In this way, signal transmission with an improved coding gain and diversity near to the maximum diversity order is achieved. Such high diversity can be exploited with either a maximum‐likelihood receiver or low‐complexity zero‐forcing receiver.