On the Average Rate of HARQ-Based Quasi-Static Spectrum Sharing Networks
Artikel i vetenskaplig tidskrift, 2012

Spectrum sharing networks are communication setups in which unlicensed secondary users are permitted to work within the spectrum resources of primary licensees. Considering quasi-static fading environments, this paper studies the effect of hybrid automatic repeat request (HARQ) feedback on the average rate of unlicensed spectrum sharing channels. The results are obtained for different scenarios; Under both peak and average secondary user transmission power constraints, the channel average rate is determined under primary user limited received interference power conditions when there is perfect information about the interference available at the secondary user transmitter. An approximate solution for power allocation between incremental redundancy (INR) HARQ-based data retransmissions is proposed which can be applied in single-user networks as well. Then, we investigate the effect of imperfect secondary-primary channel state information on the interference-limited average rate of the secondary channel. Finally, we restudy all mentioned scenarios in the case where the data transmission is constrained to have limited outage probability. Substantial performance improvement is observed with even a single HARQ-based retransmission in all simulations.


fading channels

channel state information



power allocation

capacity limits

Spectrum sharing networks




outage probability

average rate

performance analysis

cognitive radio networks

hybrid automatic repeat request


Behrooz Makki

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

Thomas Eriksson

Chalmers, Signaler och system, Kommunikation, Antenner och Optiska Nätverk

IEEE Transactions on Wireless Communications

15361276 (ISSN) 15582248 (eISSN)

Vol. 11 1 65-77 6087252


Data- och informationsvetenskap



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