Abstract
The extensive study of transmit antenna (TA) subset selection (TAS) in the context of spatial modulation (SM) has recently revealed that significant performance gains are attainable compared to SM systems operating without TAS. However, the existing TAS techniques conceived for SM were studied by considering a frequency-flat channel, which does not represent practical frequency-selective channels. In this paper, we address this open problem by designing TAS schemes for zero-padded single-carrier SM systems. Specifically, we employ a partial successive interference cancellation (SIC) receiver and invoke Euclidean distance based TA subset selection (ED-TAS) for each of the subchannels. Furthermore, we show using a theoretical analysis that the parallel subchannels obtained are nearly identical, which enables us to employ majority logic decision to obtain a single TA subset to be used in all the subchannels. The computational burden is additionally reduced by restricting the number of subchannels over which the ED-TAS technique is invoked. Furthermore, the proposed TAS schemes are extended to the multiuser scenario. The theoretical insights developed are validated using simulation results. Specifically, a signal-to-noise ratio gain as high as 3 dB is observed in the single user scenario and about 1 dB in case of a two-user scenario upon employing our TAS.
Highlights
S PATIAL modulation (SM) [1]–[12] is a relatively new multiple-input multiple-output (MIMO) scheme that requires a single radio frequency (RF) chain at the transmitter in comparison to the conventional MIMO systems [13], which require multiple RF chains
With the aid of MU-successive interference cancellation (SIC) we propose a TAS scheme for multiuser SM communication, a problem which has hitherto not been studied in the literature
We have proposed TAS schemes for single- and multi-user ZP-SC SM systems operating in a frequency selective channel, which has hitherto not been studied in the literature
Summary
S PATIAL modulation (SM) [1]–[12] is a relatively new multiple-input multiple-output (MIMO) scheme that requires a single radio frequency (RF) chain at the transmitter in comparison to the conventional MIMO systems [13], which require multiple RF chains. A link-adaptive modulation scheme was studied in [20], while both capacity based and Euclidean distance (ED) based transmit antenna selection (ED-TAS) schemes were proposed in [21] Their performances were studied under imperfect channel conditions in [22]. In [30], the authors have proposed a generalized transmit and receive diversity condition for MIMO systems based on the ED metric Their applications in the context of fullduplex drone communication employing SM was studied. 2) Secondly, we propose a space-division multiple access (SDMA) aided SM system for uplink communication in a frequency selective channel, where we generalise the Partial-SIC decoding conceived for mitigating both the inter-channel and inter-user interference during decoding each user’s signal This decoding algorithm is termed as the multiuser Partial-SIC receiver (MU-SIC).
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