Cognitive transmissions under a primary ARQ process via backward interference cancellation

Document Type

Conference Proceeding

Publication Date

12-1-2011

Abstract

In this work, we address the problem of the coexistence of Primary and Secondary Users (PU and SU, respectively) in a wireless network, where the PU employs a retransmission based error control technique (ARQ). This mechanism offers the SU a non trivial opportunity: by decoding the Primary Message (PM), the Secondary Receiver (SR) can perform interference cancellation during the whole primary ARQ window, thus enhancing its own outage performance. In particular, we investigate a Backward Interference Cancellation (BIC) mechanism: the SR buffers the secondary transmissions that underwent outage due to primary interference, and attempts to recover them once the knowledge about the PM becomes available due to decoding operation in a future instant. We present analytical results for the scenario where the primary ARQ process is limited to one retransmission, and show by numerical results the throughput benefit of BIC, over other techniques investigated in the literature. © 2011 IEEE.

Identifier

84856087987 (Scopus)

ISBN

[9781457718168]

Publication Title

2011 49th Annual Allerton Conference on Communication Control and Computing Allerton 2011

External Full Text Location

https://doi.org/10.1109/Allerton.2011.6120240

First Page

727

Last Page

735

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