Turbo-BLAST for wireless communications: theory and experiments

Abstract

TURBO-BLAST is a novel multitransmit multireceive (MTMR) antenna scheme for high-throughput wireless communications. It exploits the following ideas: the Bell Labs layered space time (BLAST) architecture; random layered space-time (RLST) coding scheme by using independent block codes and random space-time interleaving; sub-optimal turbo-like receiver that performs iterative decoding of the RLST codes and estimation of the channel matrix in an iterative and, most important, simple fashion. The net result is a new transceiver that is not only computationally efficient compared with the optimal maximum likelihood decoder, but it also yields a probability of error performance that is orders of magnitude smaller than traditional BLAST schemes for the same operating conditions. This paper also presents experimental results using real-life indoor channel measurements demonstrating the high-spectral efficiency of TURBO-BLAST.

Recent Developments in Channel Estimation and Detection for MIMO Systems

“…In the Th-HD method, in addition to pilot symbols, we use in channel estimation the symbols detected with high reliability at each iteration ; Sellathurai & Haykin (2002). For instance, consider the a posteriori probability P (m) i at the decoder output at iteration m, corresponding to the coded bit c i .…”

“…The case of perfect-CSIR is also provided as reference. The simple spatial multiplexing scheme is used at the transmitter and MIMO signal detection is based on soft parallel interference cancellation (Soft-PIC) Sellathurai & Haykin (2002); Lee et al (2006). Results shown in Fig.…”

“…For this reason, suboptimal detection techniques are usually preferred. One interesting solution is that based on Soft-PIC and linear minimum mean-square error (MMSE) filtering Wang & Poor (1999); Sellathurai & Haykin (2002); Lee et al (2006), what we considered in Sections 2 to 4. In fact, in these parts, we considered in the iterative detector a sim- plified formulation of Soft-PIC, which assumes perfect interference cancellation after the first iteration.…”

Multiple Antenna Systems: Frontier of Wireless Access

“…To mitigate the degrading effects of CAI, a robust multitransmit multi-receive system using the combination of Turbo decoding principles and V-BLAST was analyzed in literature [5], [6], called TBLAST. In this section, the use of the simplified iterative interference receiver as in [5], and its performance in the specific context of the IEEE 802.…”

“…In this section, the use of the simplified iterative interference receiver as in [5], and its performance in the specific context of the IEEE 802. In the T-BLAST architecture a single data stream is demultiplexed into M substreams, where M is the number of transmitting antennas, and each substream is then encoded into symbols and fed to its respective transmitter.…”