Abstract
In this article, space shift keying (SSK) modulation is used to study a wireless communication system when multiple relays are placed between the transmitter and the receiver. In SSK, the indices of the transmit antennas form the constellation symbols and no other data symbol are transmitted. The transmitter and the receiver communicate through a direct link and the existing relays. In this study, two types of relays are considered. Conventional amplify and forward relays in which all relays amplify their received signal and forward it to the destination in a round-robin fashion. In addition, decode and forward relays in which the relays that correctly detect the source signal will forward the corresponding fading gain to the destination in pre-determined orthogonal time slots are studied. The optimum decoder for both communication systems is derived and performance analysis are conducted. The exact average bit error probability (ABEP) over Rayleigh fading channels is obtained in closed-form for a source equipped with two transmit antennas and arbitrary number of relays. Furthermore, simple and general asymptotic expression for the ABEP is derived and analyzed. Numerical results are also provided, sustained by simulations which corroborate the exactness of the theoretical analysis. It is shown that both schemes perform nearly the same and the advantages and disadvantages of each are discussed.
Highlights
Cooperative communication creates collaboration through distributed transmission/processing by allowing different nodes in a wireless network to share resources
Cooperative Multiple-input multiple-output (MIMO) techniques promise a significant enhancement in spectral efficiency and network coverage for future wireless communication systems ([6], and references therein)
We have introduced an accurate analysis of the performance of space shift keying (SSK) modulation over Rayleigh fading channels with arbitrary number of relays
Summary
Cooperative communication creates collaboration through distributed transmission/processing by allowing different nodes in a wireless network to share resources. Complex conjugate, and DF relaying In the DF relaying system, only the relays that correctly detect the active transmit antenna index will forward the channel path gain multiplied by the unit energy deterministic signal to the destination. Conditional error probability A closed-form expressions are derived in what follows for the case of Nt = 2 transmit antennas. The average error probability will be computed by exploiting the moment-generation function (MGF)-based approach for performance analysis of digital communication systems over fading channels.
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