Citation Context

...transmission round in which the codewords are correctly decoded. Moreover, the probability Pr(Wm ≤ Rm ) is directly linked to the AMI Wm which is a random variable and function of the channel realizations experienced in rounds n = 1, . . . ,m. As such, to analyze the throughput and the outage probability, the key Time One fading block of RF channel 0 N fading blocks of FSO channel in each retransmission Transmission 1 Retransmission 2 Retransmission 2 ….. Retransmission M Figure 2. Time scales. The RF link is supposed to remain constant in the retransmissions (quasi-static channel [17], [18], [20], [21]) while in each retransmission round of HARQ N different channel realizations are experienced in the FSO link. point is to determine the AMIs as functions of channel realization(s) and find their corresponding cumulative distribution functions (CDFs)1 FWm ,m = 1, . . . ,M . Then, having the CDFs, the probabilities Pr(Wm ≤ Rm ) and, consequently, the considered performance metrics are obtained. Therefore, instead of concentrating on (1)-(2), we first find the CDFs FWm ,m = 1, . . . ,M, for the INR-based RF-FSO system. To find the CDFs, we utilize the properties of the RF and the FSO links...

Citation Context

...tigated from the informationtheoretic point of view in [20]–[22]. Recently, the optimal successful average rate of HARQ STBC configurations has been theoretically analyzed for various STBC schemes in =-=[23]-=-. Performance of MIMO HARQ systems has been studied and analyzed from various perspectives including packet combining manners [11], [24]–[28] and the information-theoretic [20]–[23], [29], [30]. Howev...

Citation Context

...–[18], [20]. On the other hand, the transmitter is provided with quantized CSI (or ARQ feedback), as illustrated in the following.1 We concentrate on the continuous data communication model [2], [24]–=-=[26]-=- where a new codeword transmission starts as soon as the previous codeword transmission ends. Finally, the results are presented in natural logarithm basis and the throughput is given in nats-per-chan...

Citation Context

...istributions. Finally, the main focus is on two stop-and-wait HARQ protocols: 1) Repetition time diversity. This scheme belongs to the diversity combining category of HARQ protocols [15], [18], [23], =-=[34]-=- where the same data is repeated in the (re)transmission rounds and, in each round, the receiver performs maximum ratio combining of all received signals. 2) Incremental Redundancy. The INR belongs to...

Citation Context

...ian noise matrix whose elements follow CN (0, 1) and H = [h1 h2] represents the fading matrix. Let us denote the maximum achievable rate of the channel model (1) by C1 and, in harmony with, e.g., [5]–=-=[10]-=-, assume the codewords to be Gaussian and sufficiently long (see [1] for discussions on the length of the ARQ sub-codewords). If C1 ≥ nL = 2R, the data is correctly decoded by the receiver, a positive...

Citation Context

...istributions. Finally, the main focus is on two stop-and-wait HARQ protocols: 1) Repetition time diversity. This scheme belongs to the diversity combining category of HARQ protocols [15], [18], [23], =-=[34]-=- where the same data is repeated in the (re)transmission rounds and, in each round, the receiver performs maximum ratio combining of all received signals. 2) Incremental Redundancy. The INR belongs to...