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Next generation wireless networks are expected to provide much higher datathroughput and reliable connections for a far larger number of wireless servicesubscribers and machine-type nodes, which result in increasingly stringentrequirements of spectral efficiency (SE) and energy efficiency (EE). Orthogonalfrequency-division multiplexing with index modulation (OFDM-IM) stands out as apromising solution to satisfy the SE requirement with a reasonable increase insystem complexity. However, the EE of OFDM-IM is still required to be enhanced.Moreover, diversity gain is hardly harvested in OFDM-IM systems, which hindersfurther reliability enhancement. In this regard, relay assisted OFDM-IM, as apromising joint paradigm to achieve both high SE and EE, was proposed and hasbeen studied since last year. The objectives of this article are to summarizethe recent achievements of this joint paradigm, articulate its pros and cons,and reveal the corresponding challenges and future work.

Toward Spectral and Energy Efficient 5G Networks Using Relayed OFDM with Index Modulation