Abstract
Abstract This paper proposes a new channel estimation scheme for two-path relaying networks where two amplify-and-forward (AF) half-duplex relay nodes alternatively transmit the signals received from a source node. The channel estimation and interference cancellation would be mutually conditional in two-path relaying networks. To overcome such a difficulty, we design new training sequences and propose precoding matrices for use at the source and relays. Deriving the Cramer-Rao lower bound (CRLB), it is shown that the proposed estimator is efficient, i.e., the proposed channel estimation scheme achieves the CRLB. The performance of the proposed channel estimation is evaluated through the computer simulations where the validity of the theoretical analysis is also demonstrated.
Highlights
During the last decade, the cooperative communications have attracted lots of attention due to its ability to improve the system performance without the use of multiple antennas which increase the hardware complexity
Due to the use of orthogonal time slot, the HD relaying basically causes a loss of the spectral efficiency
It should be noted that the channel estimation cannot be achieved without using (23), and such cases are not considered in the simulations
Summary
The cooperative communications have attracted lots of attention due to its ability to improve the system performance without the use of multiple antennas which increase the hardware complexity. In [13], a channel estimation for AF-based two-path relaying was proposed It has several practical limitations as follows:. In two-path relaying networks, the channel estimation and interference cancellation would be mutually conditional. To overcome this difficulty, we design new training sequences and precoding matrices for use at the source and relays. The channel estimation suffers from a strong interference and noise, which makes a reliable channel estimation before the interference cancellation at D difficult to be achieved To resolve such technical challenges, in what follows, we present an efficient estimator design for use in twopath relay networks.
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