Joint Channel Estimation and Symbol Detection for Orthogonal Space-Time Block-Coding Systems in Frequency-Selective Channels

• Published in: IEEE transactions on vehicular technology Vol. 56; no. 5; pp. 2475 - 2486
• Main Authors: Zhiguo Ding, Ward, D.B., Nabar, R.U.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Antennas; Applied sciences; Block codes; Blocking; Channel estimation; Channels; Coding, codes; Computational complexity; Computational modeling; Computer simulation; Cramer-Rao lower bound (CRB); Detection, estimation, filtering, equalization, prediction; Exact sciences and technology; Fading; Frequency estimation; Frequency-selective fading channels; Information, signal and communications theory; iterative receivers; orthogonal space-time block coding (OSTBC); Performance analysis; Radiocommunications; Receiving antennas; Redundancy; Signal and communications theory; Signal, noise; Space technology; Studies; symbol detection; Symbols; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; Block code; Space-time codes; Parameter estimation; orthogonal space-time block coding (OSTBC); Wireless telecommunication; Iterative method; Frequency selection; Channel estimation; High speed; SIMO system; MISO system; Receiving antenna; Antenna array; Cramer Rao inequality; Fading channels; Fading; Cramer-Rao lower bound (CRB); iterative receivers; Probabilistic approach; Redundancy; Algorithm; Computational complexity; Symbol detection; Multiple system; System simulation; Reliability
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2007.899942

Orthogonal space-time block coding (OSTBC) in multiple-antenna wireless systems has recently emerged as one of the most promising reliability-enhancing technologies for high-speed, high-quality data services. In this paper, we propose a technique to achieve joint channel estimation and symbol detection for OSTBC in frequency-selective fading channels. The key observation is that a multiple-input-single-output system, which is using OSTBC, can be transformed into an equivalent single-input-multiple-output system using the implicit redundancy in OSTBC. This allows a probabilistic method, known as the Baum-Welch algorithm, to be applied at each output branch. As each output branch is a function of the same input, redundant information may be exchanged between the multiple branches to improve detection performance. The proposed technique does not require multiple antennas at the receiver and only has moderate computational complexity. Furthermore, the Cramer-Rao lower bound (CRB) is also developed to facilitate performance analysis. Simulation results are provided to demonstrate the performance of the proposed algorithm.