Abstract
In this letter, a low-complexity iterative detector with frequency domain equalization is proposed for generalized spatial modulation (GSM) aided single carrier (SC) transmissions operating in frequency selective channels. The detector comprises three main separate tasks namely, multiple-input multiple-output (MIMO) equalization, active antenna detection per user and symbol wise demodulation. This approach makes the detector suitable for a broad range of MIMO configurations, which includes single-user and multiuser scenarios, as well as arbitrary signal constellations. Simulation results show that the receiver can cope with the intersymbol interference induced by severe time dispersive channels and operate in difficult underdetermined scenarios.
Highlights
Generalized spatial modulation (GSM) [1]-[2] is a multiple-input multiple-output (MIMO) scheme that offers a tradeoff between the high spectral efficiency (SE) of full spatial multiplexing multipleinput multiple-output (MIMO) and the low complexity of the single radio frequency (RF) transmitter chain of spatial modulations (SMs) [3]
In this letter, a low-complexity iterative detector with frequency domain equalization is proposed for generalized spatial modulation (GSM) aided single carrier (SC) transmissions operating in frequency selective channels
Through proper formulation of the MU GSM-SC detection problem, which uses a mixture of frequency domain and time domain variables, MIMO equalization is accomplished in the frequency domain while the GSM symbol decision is kept on the time domain and performed independently for each user
Summary
Generalized spatial modulation (GSM) [1]-[2] is a multiple-input multiple-output (MIMO) scheme that offers a tradeoff between the high spectral efficiency (SE) of full spatial multiplexing MIMO and the low complexity of the single radio frequency (RF) transmitter chain of spatial modulations (SMs) [3]. The challenge becomes even greater when the receiver has to mitigate the high ISI resulting from the operation of SC systems in multipath channels Against this background, the main contributions of this letter are summarized as follows: We develop an iterative detector for CP-aided GSM-SC systems which separates the tasks of MIMO equalization, active AE detection per user and symbol wise demodulation. Through proper formulation of the MU GSM-SC detection problem, which uses a mixture of frequency domain and time domain variables, MIMO equalization is accomplished in the frequency domain while the GSM symbol decision is kept on the time domain and performed independently for each user This allows the complexity to remain low even in large scale systems and highly dispersive channels. K denotes the number of combinations of N symbols taken k at a time, In is the n×n identity matrix and I (v) is the indicator function which returns 0 if v and +∞ otherwise
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
