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MIMO slotted ALOHA systems with collision resolution and truncated HARQ transmission and combining

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Abstract

In this paper, we investigate throughput and delay enhancement for two multi-user multiple-input multiple-output (MIMO) systems one with space-time block coding (STBC), the other with spatial multiplexing (SM) at the transmitter. Users operate using the slotted ALOHA (SA) protocol to access the wireless channel resulting in a high probability of collision. For both systems, we consider the uplink scenario, and we propose to recover the collided packets with spatial successive interference cancelation (SSIC) and a protocol for retransmission and combining of unsuccessfully received collided packets applying a truncated Hybrid Automatic Repeat reQuest (HARQ) scheme. For the first system, we propose to use channel realizations of collided packets as different signatures to separate them. Moreover, we propose a solution for the problem when the received powers are comparable. For this system, we note that the orthogonality of the STBC matrix allows the use of a simple linear processing step for the initialization of SSIC. For the SM multi-user system, the separation of collided packets is based on V-BLAST processing and SSIC. We also propose how to combine retransmitted packets. For both systems, we evaluate the block error rate, the throughput, and the delay. A comparison is done with the single-user case and with other receivers proposed in the literature.

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Authors and Affiliations

  1. ENIS, Sfax, Tunisia

    Nejah Missaoui & Ines Kammoun

  2. SupCom, El Ghazala, Tunisia

    Mohamed Siala

Authors
  1. Nejah Missaoui
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  2. Ines Kammoun
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  3. Mohamed Siala
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Correspondence to Nejah Missaoui.

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Missaoui, N., Kammoun, I. & Siala, M. MIMO slotted ALOHA systems with collision resolution and truncated HARQ transmission and combining. Ann. Telecommun. 71, 157–171 (2016). https://doi.org/10.1007/s12243-015-0483-6

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  • DOI: https://doi.org/10.1007/s12243-015-0483-6

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