Abstract
Power domain non-orthogonal multiple access (PD-NOMA) has been widely recognized a spectrum-efficient multi-user transmission method when the channel gains across different users vary obviously. Due to the long travel distance between the space and the Earth in satellite communication scenarios, the advantages from PD-NOMA will disappear since the signals experience almost the same path loss. However, in hybrid satellite networks, terrestrial users equipped with different size antennas may lead to various receiving gains, which are equivalent to diverse channel gains. In this paper, by deeply exploiting such a characteristic, we propose a power domain multiplexing based co-carrier transmission method in a hybrid satellite network. Superposing a weak signal on a strong one, two signals are enabled to be transmitted on the same carrier with the bandwidth of the strong signal. To guarantee the signals are decodable at both sides, a user pairing strategy is investigated in detail, and the performance gain of the new method is further analyzed. Simulation results show that a carrier resource can be saved in the proposed method with the sacrifice of a marginal bit-error-rate performance.
Highlights
Satellite communication has been considered an efficient solution for service enhancement in beyond 5G and 6G networks [1]- [5]
In this paper, recognizing the diverse receiving performance of users in a hybrid satellite network, we propose a power domain multiplexing (PDM)-based co-carrier transmission method where two signals share the same carrier in the downlink channel
ERGODIC SUM RATE ANALYSIS Since the small-scale fading is considered in the channel model, we analyze the performance of conventional frequency division multiple access (FDMA) and PDM-based schemes in terms of the ergodic sum rate
Summary
Satellite communication has been considered an efficient solution for service enhancement in beyond 5G and 6G networks [1]- [5]. For the purpose of resource allocation optimization, a channel state based access strategy was developed, where a user-pairing scheme was studied for the terrestrial subnetwork. To the best of our knowledge, the existing works on PD-NOMA based satellite communications are mainly discussed by exploiting the beam gain with different angles-ofdeparture, where user equipments are assumed to have the same receiving capability. We develop a power domain multiplexing (PDM) based co-carrier transmission method in hybrid satellite networks. The main contributions of the paper can be summarized as follows: i) The proposed co-carrier transmission scheme occupies part of the bandwidth allocated for the users served simultaneously, which is more spectral efficient than the conventional PD-NOMA method that occupies the total bandwidth; ii) By fully exploiting the diversity of antenna gains in hybrid satellite networks, a user pairing strategy including. While CN (a, c) denotes the distribution of circularly symmetric complex Gaussian random variables with mean a and variance c
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