Cognitive cooperative MAC with one primary and two secondary users: achievable rates and optimal power control
Yükleniyor...
Dosyalar
Tarih
2014-11
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE-INST Electrical Electronics Engineers Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We consider a three-user fading cognitive cooperative multiple access channel (MAC) with one primary and two secondary transmitters. We propose two encoding/decoding strategies with varying levels of cooperation, based on block Markov superposition encoding and backward decoding. The first is an overlay model, where the secondary users (SUs) aid the transmission of the primary user (PU) by causally decoding the PU message and forwarding it while also cooperating among each other. The second is an underlay model, where the SUs cooperate by decoding and forwarding each other's messages while treating the signal received from the PU as noise. In either case, the PU is guaranteed to operate at its maximum achievable single user rate. We characterize the achievable SU rate region for both models and maximize this region as a function of the transmit powers. The simulation results show that the SU rate region can be significantly enlarged, particularly using the overlay model.
Açıklama
Anahtar Kelimeler
Channel coding, Cognitive radio, Cooperative communication, Multiuser channels, Optimization, Power control, Information-theoretic perspective, Multiple-access, Interference channels, Radio channels, Capacity, Transmitter
Kaynak
IEEE Communications Letters
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
18
Sayı
11
Künye
Edemen, Ç. & Kaya, O. (2014). Cognitive cooperative MAC with one primary and two secondary users: Achievable rates and optimal power control. IEEE Communications Letters, 18(11), 1895-1898. doi:10.1109/LCOMM.2014.2360519
