Abstract
In this paper, we propose jointly-optimized beamforming algorithms for cognitive networks to maximize the achievable rates, where primary and cognitive users share the same spectrum and are equipped with multiple antennas. We consider the transmission of a single information stream in both primary and secondary links. No coordination is required between the primary and cognitive users and the interference cancellation is done at the cognitive user. Specifically, the beamforming vectors of the cognitive link are designed to maximize the achievable rate under the condition that the interference both at the primary and cognitive receivers is completely nullified. Furthermore, it is proved that the achievable rate of a general N C t × 2 (N t C transmit antennas at the cognitive transmitter and 2 receive antennas at the cognitive receiver) cognitive multiple-input multiple-output (MIMO) link employing the optimal proposed beamformers (which completely nullifies the interference to and from the primary link while maximizing its own achievable rate) is the same as the rate of an interference-free (N t C-1) × 1 multiple-input single-output (MISO) link employing an optimal maximal ratio transmission beamforming vector. The sum rate performance of the proposed algorithms is evaluated by Monte Carlo simulations. The impact of the number of transmit and receive antennas on the proposed algorithm is also discussed.
| Original language | English |
|---|---|
| Article number | 6168185 |
| Pages (from-to) | 1390-1397 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Communications |
| Volume | 60 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2012 May 1 |
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All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
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Uncoordinated beamforming for cognitive networks. / Yiu, Simon; Chae, Chan Byoung; Yang, Kai; Calin, Doru.
In: IEEE Transactions on Communications, Vol. 60, No. 5, 6168185, 01.05.2012, p. 1390-1397.Research output: Contribution to journal › Article
TY - JOUR
T1 - Uncoordinated beamforming for cognitive networks
AU - Yiu, Simon
AU - Chae, Chan Byoung
AU - Yang, Kai
AU - Calin, Doru
PY - 2012/5/1
Y1 - 2012/5/1
N2 - In this paper, we propose jointly-optimized beamforming algorithms for cognitive networks to maximize the achievable rates, where primary and cognitive users share the same spectrum and are equipped with multiple antennas. We consider the transmission of a single information stream in both primary and secondary links. No coordination is required between the primary and cognitive users and the interference cancellation is done at the cognitive user. Specifically, the beamforming vectors of the cognitive link are designed to maximize the achievable rate under the condition that the interference both at the primary and cognitive receivers is completely nullified. Furthermore, it is proved that the achievable rate of a general N C t × 2 (N t C transmit antennas at the cognitive transmitter and 2 receive antennas at the cognitive receiver) cognitive multiple-input multiple-output (MIMO) link employing the optimal proposed beamformers (which completely nullifies the interference to and from the primary link while maximizing its own achievable rate) is the same as the rate of an interference-free (N t C-1) × 1 multiple-input single-output (MISO) link employing an optimal maximal ratio transmission beamforming vector. The sum rate performance of the proposed algorithms is evaluated by Monte Carlo simulations. The impact of the number of transmit and receive antennas on the proposed algorithm is also discussed.
AB - In this paper, we propose jointly-optimized beamforming algorithms for cognitive networks to maximize the achievable rates, where primary and cognitive users share the same spectrum and are equipped with multiple antennas. We consider the transmission of a single information stream in both primary and secondary links. No coordination is required between the primary and cognitive users and the interference cancellation is done at the cognitive user. Specifically, the beamforming vectors of the cognitive link are designed to maximize the achievable rate under the condition that the interference both at the primary and cognitive receivers is completely nullified. Furthermore, it is proved that the achievable rate of a general N C t × 2 (N t C transmit antennas at the cognitive transmitter and 2 receive antennas at the cognitive receiver) cognitive multiple-input multiple-output (MIMO) link employing the optimal proposed beamformers (which completely nullifies the interference to and from the primary link while maximizing its own achievable rate) is the same as the rate of an interference-free (N t C-1) × 1 multiple-input single-output (MISO) link employing an optimal maximal ratio transmission beamforming vector. The sum rate performance of the proposed algorithms is evaluated by Monte Carlo simulations. The impact of the number of transmit and receive antennas on the proposed algorithm is also discussed.
UR - http://www.scopus.com/inward/record.url?scp=84861183928&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84861183928&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2012.030712.110008
DO - 10.1109/TCOMM.2012.030712.110008
M3 - Article
AN - SCOPUS:84861183928
VL - 60
SP - 1390
EP - 1397
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
SN - 0096-1965
IS - 5
M1 - 6168185
ER -