Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Managing imperfect spectrum sensing in the secondary service
T2 - increasing sensing time or adopting channel coding?
AU - Haddadi, Sadjad
AU - Saeedi, Hamid
AU - Navaie, Keivan
PY - 2013/6
Y1 - 2013/6
N2 - Imperfect spectrum sensing in overlay spectrum sharing may cause collision between primary and secondary transmission resulting in performance degradation for primary users. To satisfy the quality of service requirement imposed by the primary service, the maximum probability of collision has to be kept below a given threshold. The collision, if occurs, also results in increasing error rate in the secondary system. What can be done if the secondary service needs better error rate than the value imposed by the collision constraint in the primary network? From secondary user perspective, this can be taken care of by employing channel coding techniques at the expense of effective rate reduction. Alternatively, one can increase the sensing time to reduce the collision probability at the expense of reducing the data transmission time. This also reduces the effective data rate for secondary users. In this letter, we compare these two approaches and demonstrate a situation where using rate-compatible Low-Density Parity-Check codes, the effective data rate for the coded case can be significantly more than that of the case without channel coding while exhibiting a considerably better performance. We then discuss necessary condition for such an advantage and come up with cases where increasing sensing time is preferred over adopting channel coding.
AB - Imperfect spectrum sensing in overlay spectrum sharing may cause collision between primary and secondary transmission resulting in performance degradation for primary users. To satisfy the quality of service requirement imposed by the primary service, the maximum probability of collision has to be kept below a given threshold. The collision, if occurs, also results in increasing error rate in the secondary system. What can be done if the secondary service needs better error rate than the value imposed by the collision constraint in the primary network? From secondary user perspective, this can be taken care of by employing channel coding techniques at the expense of effective rate reduction. Alternatively, one can increase the sensing time to reduce the collision probability at the expense of reducing the data transmission time. This also reduces the effective data rate for secondary users. In this letter, we compare these two approaches and demonstrate a situation where using rate-compatible Low-Density Parity-Check codes, the effective data rate for the coded case can be significantly more than that of the case without channel coding while exhibiting a considerably better performance. We then discuss necessary condition for such an advantage and come up with cases where increasing sensing time is preferred over adopting channel coding.
KW - Cognitive radio networks
KW - channel coding
KW - low-density parity-check codes
KW - energy detector
KW - ENERGY DETECTION
KW - FADING CHANNELS
U2 - 10.1109/LCOMM.2013.051313.130367
DO - 10.1109/LCOMM.2013.051313.130367
M3 - Journal article
VL - 17
SP - 1232
EP - 1235
JO - IEEE Communications Letters
JF - IEEE Communications Letters
SN - 1089-7798
IS - 6
ER -