Abstract
In this study, a novel cluster index modulation (CIM) scheme, which is based on indexing the available clusters in the environment, is proposed for future mmWave communication systems. Exploiting the fact that the available clusters in the system are well separated in terms of their angular distribution, we selected the best path for each of them and then performed IM in an algorithmic manner to convey information bits. It is shown that by means of large antenna arrays and analog RF beamforming with the indexed clusters, the destructive effect of inter-beam/cluster interference can be remarkably mitigated. Also, we designed a hybrid beamforming architecture at the transmitter to further reduce the effect of residual inter-beam/cluster interference, where the analog RF beamformer is followed by a digital baseband precoder using the zero-forcing technique. Computer simulations reveal that the proposed scheme can provide better error performance than traditional mmWave communication, and the proposed hybrid architecture outperforms beam index modulation (BIM) for a point-to-point scenario. Semi-analytical derivations and closed-form unconditional pairwise error probability (UPEP) expressions are derived for both analog and hybrid architectures, which confirm the validity and superiority of our proposed scheme.
Highlights
With increasing demands for a higher data rate and spectrum usage, new technologies and novel techniques for future wireless systems are needed
We studied our scheme in the case of analog and hybrid architectures at the transmitter and derived our semi-analytical derivations and closed-form analytical unconditional pairwise error probability (UPEP) expressions for both architectures, which prove the validity of our proposed scheme
We have proposed a novel Index modulation (IM) scheme for future millimeter wave (mmWave) communication systems, which takes into consideration well-separated clusters for indexing purpose
Summary
With increasing demands for a higher data rate and spectrum usage, new technologies and novel techniques for future wireless systems are needed. To compensate the effect of path loss, mmWave systems should employ large antenna arrays in both the transmitter and receiver to leverage beamforming gain. Cluster Index Modulation mmWave communication systems with large antenna arrays by significantly reducing the number of RF chains (Koc et al (2020)). Mokh et al (2019) proposed a hybrid beam index modulation (BIM) scheme by adopting a layer of digital precoding to solve the problem of inter-beam interference in mmWave communication systems. A novel IM scheme based on indexing separated clusters in the mmWave communication environment is proposed. Simulation results reveal that our proposed scheme can perform better than traditional mmWave communication in terms of BER in the presence of non-orthogonal paths.
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