Isometry during MIMO Joint Channel Estimation and Data Detection in Fading Channels
نویسندگان
چکیده
Due to the nature of multiplicative Rayleigh fading, symmetric space time block codes, and joint estimation and detection schemes, isometry (ambiguities in channel estimation and data detection) degrades MIMO system performances. Training breaks isometry but reduces capacity. Asymmetric space time block code mitigates isometry by replacing training with data-bearing asymmetric codewords. This paper presents a continuous fading state space model, introduces a Kalman filter and innovations based joint estimation and detection scheme, and discusses the problem of and the solutions to isometry. The analysis and simulation demonstrate that asymmetric codes is a novel and efficient way to break isometry.
منابع مشابه
Joint LS Estimation and ML Detection for Flat Fading MIMO Channels
In recent years, Multi-Input Multi-Output (MIMO) communications are introduced as an emerging technology to offer significant promise for high data rates and mobility required by the next generation wireless communication systems. Using multiple transmit as well as receive antennas, a MIMO system exploits spatial diversity, higher data rate, greater coverage and improved link robustness without...
متن کاملA Tree-Structured Blind Algorithm for Joint Parametric Channel Estimation and Non-coherent Data Detection in an OFDM-CDMA Wireless System with Antenna Arrays
A blind joint parametric channel estimation and noncoherent data detection algorithm is proposed for the downlink of an orthogonal-frequency-division-multiplexing code-division-multiple-access (OFDM-CDMA) system with multiple-input-multiple-output (MIMO) antenna arrays. To reduce the computational complexity, we first develop a tree-structured algorithm to estimate high dimensional parameters p...
متن کاملSingle-Carrier Frequency-Domain Equalization for Orthogonal STBC over Frequency-Selective MIMO-PLC channels
In this paper we propose a new space diversity scheme for broadband PLC systems using orthogonal space-time block coding (OSTBC) transmission combined with single-carrier frequency-domain equalization (SC-FDE). To apply this diversity technique to PLC channels, we first propose a new technique for combining SC-FDE with OSTBCs applicable to all dispersive multipath channels impaired by impulsive...
متن کاملEstimation of continuous flat fading MIMO channels
Multiple-input–multiple-output (MIMO) systems can provide high data rate wireless services in a rich scattering environment. In this paper, we study one of the proposals for MIMO systems, the Bell Labs Layered Space-Time (BLAST) architecture. Channel estimation using training sequences is required for coherent detection in BLAST. We apply the maximum-likelihood channel estimator and the optimal...
متن کاملAlgorithms for Space-Time Equalization of Wireless Channels
In this thesis we investigate receiver techniques for maximum likelihood (ML) joint channel/data estimation in flat fading multipleinput multiple-output (MIMO) channels. The performance of iterative least squares (LS) for channel estimation combined with sphere decoding (SD) for data detection is examined for block fading channels, demonstrating the data efficiency provided by the semi-blind ap...
متن کامل