Abstract
With sophisticated signal and information processing algorithms, air interfaces with space-time (ST) coding and multiple reception antennas substantially improve the reliability of wireless links. This paper proposes a new receiver algorithm for differential ST coded transmissions over the finite-impulse-response (FIR) rich multipath fading channels. The symbol detection introduced in this paper is a deterministic subspace-based approach in a multiple-input and multiple-output (MIMO) system framework. The receiver (i) operates in a blind fashion without estimating the channel or its inverse and (ii) is able to work with a small number of signal samples and hence can be applied in the quasistatic channels. The proposed scheme employs multiple antennas at both sides of the transceiver and exploits both the antenna diversity and the multiple constant modulus (MCM) characteristics of the signaling. The receiver is able to blindly mitigate the intersymbol interference (ISI) in a rich multipath propagation environment, and this has been verified through the extensive Monte Carlo simulations.
Highlights
Space-time (ST) multiple-input multiple-output (MIMO) transmission and reception is regarded as one of the most effective approaches for increasing channel capacity or system fading-resistance [1, 2, 3, 4, 5, 6, 7]
In contrast to the method presented in this paper, a combination of orthogonal frequency division multiplexing (OFDM) scheme with one of differential ST modulation (DSTM), differential space-code modulation (DSCM), and Khatri-Rao ST code (KRST) is feasible for transceiver designs over MIMO frequencyselective channels, because OFDM is capable of converting the frequency-selective channels into frequency-flat fading channels
The complete receiver algorithm proposed for DSTM signaling over the finite-impulse-response (FIR) rich multipath channels proceeds on a frame-by-frame basis according to the following four steps: (1) estimate the direct input signal subspace basis and signal approximations according to the method in Section 3.1; (2) calculate W by iterating the alternating projections exploiting multiple constant modulus (MCM) using the algorithm presented in Section 3.2; (3) determine X by X = WΞ;
Summary
Space-time (ST) multiple-input multiple-output (MIMO) transmission and reception is regarded as one of the most effective approaches for increasing channel capacity or system fading-resistance [1, 2, 3, 4, 5, 6, 7]. A new type of ST block code is the Khatri-Rao ST code (KRST) proposed in [13], which possesses a built-in channel identifiability It relies on the blind identifiability properties of the trilinear models and parallel factor analysis to estimate the channel states and to detect the ST symbols. In contrast to the method presented in this paper, a combination of orthogonal frequency division multiplexing (OFDM) scheme with one of DSTM, DSCM, and KRST is feasible for transceiver designs over MIMO frequencyselective channels, because OFDM is capable of converting the frequency-selective channels into frequency-flat fading channels. The new transceiver scheme consists of (i) a DSTM transmitter, (ii) an equalization algorithm based on direct input signal subspace estimation, and (iii) a differential ST symbol detector. The novelty of this paper stems from integrating subspace method based signal deconvolution and the exploitation of constant modulus property of the transmitted symbols to facilitate the noncoherent detection of DSTM signaling in a frequency-selective environment
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