Performance analysis of cooperative multi‐carrier relay‐based UAV networks over generalized fading channels

The ground-to-air communications in the aircraft approach stage suffer from multipath fading. We propose to combat this problem using cooperative communication technique. The relay selection problem is formulated to minimize the spectrum cost while preserving the signal-to-noise-ratio (SNR) outage requirement of the approaching aircraft. By leveraging the position and velocity information in the automatic dependent surveillance-broadcast messages, the average channel gains can be derived with uncertainty sets based on the Ricean channel model. Because the outage probability of the received SNR is intractable, we transform the outage constraint into a simple but efficient reliability requirement. The formulated problem is a mixed integer nonlinear optimization problem, with robustness in the worst-case average SNR. A robust greedy relay selection algorithm is proposed as a solution, whereby a Kalman filter based trace prediction algorithm is adopted to determine the order of relays. Simulation results are given to show the effectiveness of the proposed scheme. -B of the aircraft under serious weather condition, the synthetic vision system (SVS) [2] has been developed to extend the visual range of the pilot. The SVS can integrate the position information from global positioning system and inertial navigation system with the traffic information from the control tower, which are displayed on the screen to help the pilot make decisions. In SVS, data link technology is adopted for the signal transmission from the control tower to the approaching aircraft. However, because of the high speed and low elevation of the approaching aircraft, the performance of point-to-point data link suffers from serious multipath fading in the flight test [3,4].In the last decade, cooperative communication technique has received much attention in the communication society [5][6][7], which is proved to be effective in combating multipath fading by exploiting the spatial diversity of the relay nodes. In our work, we consider the application of cooperative communication technique in the aircraft approach scenario. Considering the requirement RELAY SELECTION FOR COOPERATIVE COMMUNICATIONS IN AIRCRAFT APPROACH 115 ‡ Straight-in approach means the final approach has begun without first executing a procedure turn, and the trace of the aircraft approach follows the extended runway centerline. In fact, the approaching pattern only determines the mobility pattern of the aircrafts. The analysis and algorithm in our paper still work under other approaching patterns. § The simulation is conducted on MATLAB 7.0.1, where the system configurations are : Intel(R) Core(TM)2 Duo CPU E7200@2.53GHz, 2G RAM, 32bit OS.

Section: Related Workmentioning

confidence: 99%

“…Then, sum and O V sum are updated accordingly (line [10][11]. The algorithm starts with an empty relay set SR, CR denotes all candidate relay set.…”

Section: Robust Greedy Relay Selection Algorithmmentioning

confidence: 99%

ADS‐B aided robust relay selection for cooperative communications in aircraft approach

Hua

Chen

et al. 2014

“…where W , .´/ is the Whittaker function. From the definition of Whittaker function [42, Equations (9.220.2) and (9.210.2)], (45) can further be simplified as (27).…”

Section: Appendix A: Derivation Of (27)mentioning

confidence: 99%

Performance analysis of cooperative network over Nakagami and Rician fading channels

Khan

Rajatheva

Tanoli

et al. 2013

SUMMARYThis paper presents an analysis on the performance of single-relay and multiple fixed-relay cooperative network. The relay nodes operate in amplify-and-forward (AF) mode and transmit the signal through orthogonal channels. We consider maximal-ratio combining at the destination to get the spatial diversity by adding the received signals coherently. The closed-form moment-generating function (MGF) for the total equivalent signal-to-noise ratio (SNR) is derived. The exact expressions of symbol-error rate, outage capacity, and outage probability are obtained using the closed-form MGF for single-relay and multiple-relay cooperative network with M -ary phase shift keying (M -PSK) and M -ary quadrature amplitude modulation (M -QAM) over independent and non-identical Nakagami-m channels and Rician fading channels. The approximated closed-form expression of ergodic capacity is derived for both Nakagami-m and Rician fading channels. The performance of the system is analyzed at various relay locations. The theoretical results are then compared with the simulation results obtained for binary PSK, quadrature PSK, and 16-QAM modulation schemes to verify the analysis. Here, the expressions derived can be easily and more efficiently used to compute the performance parameters than doing Monte Carlo simulations. It is shown that cooperation is significant only for low K values for Rician by plotting cooperation gain versus K. The results show that the cooperative network performs best when the relay is located in the middle of source to destination link, at lower SNR values, and the performance of the system is worst if the relay is located closer to the source than to the destination.

“…For DF and CC protocols, relay nodes not only store and forward the received information, but also can decode the received signals and then transmit the re-encoded information or redundant information to enhance the system performance. Since the cooperation concept was proposed, many researchers work on this relevant field [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Cooperative quadrature physical layer network coding in wireless relay networks

Yang

Chong

Meng

et al. 2013

SUMMARYThis paper proposes a cooperative quadrature physical layer network coding (CQPNC) scheme for a dual-hop cooperative relay network, which consists of two source nodes, one relay node and one destination node. All nodes in the network have one antenna, and the two source nodes transmit their signals modulated with quadrature carriers. In this paper, a cooperative quadrature physical layer network coded decode-andforward (DF) relay protocol (CQPNC-DF) is proposed to transmit the composite information from the two source nodes via the relay node to the destination node simultaneously to reduce the number of time slots required for a transmission. The proposed CQPNC-DF relay protocol is compared with time-division multiple-access amplify-and-forward (TDMA-AF), TDMA-DF, cooperative network coded DF (CNC-DF) and cooperative analog network coded AF (CANC-AF) relay protocols to demonstrate its effectiveness in terms of bit error rate (BER) and system throughput under different propagation conditions. The simulation results reveal that the proposed CQPNC-DF relay protocol can significantly improve the network performance. Compared with two TDMA schemes and CNC-DF, the proposal can provide up to 100% and 50% throughput gains, respectively. Moreover, no matter what the scene, the proposed scheme always has the lowest BER in the low SNR region.