On the outage performance of decode-and-forward based relay ordering in cognitive wireless sensor networks

Abstract

In this paper, the issue of secondary network access in cognitive wireless sensor networks (CWSN) is investigated. An efficient scheme (in terms of both power and spectrum) named Decode-and-Forward based multi-relay scheme with relay ordering (DF-MRRO) is proposed for secondary network access. More important, this scheme is used to enhance the performance of secondary network. In an effort to assess the performance, the received signal-to interference-plus-noise ratio (SINR) of both the primary and secondary links are derived, from which new exact closedform expressions for the outage probability of primary and secondary networks are derived. Moreover, the diversity order is calculated for both the primary and secondary network. It is also shown that full diversity order can be achieved if the condition of power requirement is satisfied. Finally, simulation results obtained for the outage performance of the proposed scheme in primary and secondary networks prove the effectiveness of the proposed scheme. It also demonstrates that a maximum of 7dB SNR gain can be achieved in the proposed DF-MRRO scheme.

Distributed Goppa-Coded Generalized Spatial Modulation: Optimized Design and Performance Study

“…Moreover, Table 3 lists the optimal selection pattern p opt and the locally optimized selection pattern p loc . 4,6,7,8,9,10,11,12,13,14, 15] C R (32, 12,9) z 4 + γz + γ…”

“…Step 2: Determine the set I = {1, 2, • • • , L = 70} and the set ϕ = {p (1) , p (2) , • • , p (70) with 70 selection patterns, where ϕ is denoted as follows: [2,3,4,5], [2,3,4,6], [2,3,4,7], [2,3,4,8], [2,3,5,6], [2,3,5,7], [2,3,5,8], [2,3,6,7], [2,3,6,8], [2,3,7,8], [2,4,5,6], [2,4,5,7], [2,4,…”

“…Step 3: For each i ∈ I and p (i) ∈ ϕ, we obtain all codeword sets (16,4,7) resulting in 256 source information sequences, and determine w (max) min = 7.…”

“…Source codes C S (16, 8, 5), C S (32, 17,7) Relay codes C R (16,4,7), R (32, 12,9) Equivalent code rate in the D 1/4, 17/64 MIMO configuration GSM: First, we compare the performance of the proposed system (χ S-R = ∞) under different information bit selection algorithms to illustrate the effectiveness of the proposed optimized algorithms. The simulation results in Figure 3 show the advantages of the proposed optimized algorithms over the random selection method.…”

“…Another technology that can effectively improve the system reliability is coded cooperation (CC) (i.e., distributed channel codes) [5] with the integration of channel coding and cooperative technologies such as amplify-and-forward (AF) [6] and decode-and-forward (DF) [7]. The typical CC usually has three terminals called the source, relay, and destination, where the source and relay cooperate with each other so that a channel code is yielded in the destination.…”