Adaptive Channel Matched Extended Alamouti Space-time Code Exploiting Partial Feedback
نویسنده
چکیده
Biljana Badic et al. 443 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 ( L , , 4 3 = n ) 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.
منابع مشابه
Two Adaptive Space - Time Block Coded MIMO Systems Exploiting Partial Channel Knowledge at the Transmitter
In this contribution two new closed loop transmission schemes over wireless MIMO channels with only partial channel knowledge at the transmitter are presented. Utilizing Space Time Block Codes (STBCs) with additional preand post signal processing provides nT independent virtual channels, where nT is the number of transmit antennas. In most cases we consider nT = 4. The first scheme is based on ...
متن کاملQuasi-Orthogonal Space-Time Block Codes for Data Transmission over Four and Eight Transmit Antennas with Very Low Feedback Rate
Since the publication of Alamouti’s famous space-time block code for two transmit antennas, various suboptimal space-time block codes for multi-input/multi-output fading channels have been proposed not achieving full diversity at full rate. In this paper we present a family of adaptive, channel dependent, rate-one Extended Alamouti spacetime block codes for four and eight transmit antennas. Onl...
متن کاملAn Efficient Adaptive Space Time Coding Scheme for MIMO-OFDM Systems
Within the framework of the Stingray Project, a Hiperman compatible MIMO system, three architectures with different rate-one Space-Time Codes (STC) are presented and their performance assessed. Viewing beam-forming and Alamouti as the two extreme cases of the trade-offs between performance/ complexity/feedback-requirements, an efficient scheme is proposed that reduces complexity and feedback re...
متن کاملAdaptive Video Transmission over Wireless MIMO System
There has been an interesting issue in multimedia communications over wireless system in recent years. In order to achieve high data rate wireless multimedia communications, spatial multiplexing technique (Foschini & Gans, 1998; Wolniansky et al. 1998) has recently developed as one of the most noteworthy techniques as multiple-input and multiple-output (MIMO) systems. If the channel state infor...
متن کاملIterative detection for space-time coded synchronous CDMA communication systems
An iterative receiver is proposed for the downlink of CDMA communication systems that employ both a convolutional channel code and a space-time trellis code to achieve transmit diversity in the presence of channel fading. The proposed iterative receiver operates by exchanging extrinsic information between the channel and space-time decoders in each iteration. Comparison of performance results, ...
متن کامل