Abstract
This paper investigates orthogonal space-time block code (OSTBC) transmission for multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying networks composed of one source, K relays, and one destination and with M-ary frequency-shift keying (FSK) modulation. A non-coherent detection scheme is proposed and analyzed in a situation where the fading channels undergo temporal correlation. Specifically, by properly exploiting the implicit pilot-symbol-assist property of FSK transmission, the destination estimates the overall channels based on the linear minimum mean square error (LMMSE) estimation algorithm. It then utilizes the maximal ratio combining (MRC) to detect the transmitted information. An upper bound on the probability of errors is derived for a network with arbitrary numbers of transceiver antennas and relays. Based on the obtained bit error rate, the full achievable diversity order is verified. Simulation results are presented to show the validity of the analytical results.
Highlights
Non-coherent transmission techniques have received a lot of attention due to their potential improvement in complexity by eliminating the need of channel state information at the receiver
Employing those non-coherent techniques is preferable in wireless relay networks since there are many wireless fading channels involved in the networks [1-4], which makes the task of channel estimation very complex and expensive to implement
orthogonal space-time block code (OSTBC) is employed at the source to transmit a signal to the destination
Summary
Non-coherent transmission techniques have received a lot of attention due to their potential improvement in complexity by eliminating the need of channel state information at the receiver. Reference [13] is the only work to develop a detection scheme for non-coherent amplifyand-forward (AF) relay networks. Multiple-input multiple-output (MIMO) relaying techniques, which use multiple antennas at all nodes in the network, have been known to improve considerably performance in terms of data transmission rates as well as reliability over wireless channels. The work only considers a special network in which the source is equipped with two transmit antennas, the multiple relays and destination are equipped with a single antenna, and an Alamouti space-time block code is employed. The output of the matched filter of x(t) is denoted by x[k]
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