A low complexity distributed differential scheme based on orthogonal space time block coding for decode-and-forward wireless relay networks

Abstract

<span lang="EN-US">This work proposes a new differential cooperative diversity scheme with high data rate and low decoding complexity using the decode-and-forward protocol. The proposed model does not require either differential encoding or channel state information at the source node, relay nodes, or destination node where the data sequence is directly transmitted and the differential detection method is applied at the relay nodes and the destination node. The proposed technique enjoys a low encoding and decoding complexity at the source node, the relay nodes, and the destination node. Furthermore, the performance of the proposed strategy is analyzed by computer simulations in quasi-static Rayleigh fading channel and using the decode-and-forward protocol. The simulation results show that the proposed differential technique outperforms the corresponding reference strategies.</span>

Two-way differential strategy for wireless sensor networks

“…Recently, several distributed special diversity schemes have been suggested to offer full diversity and high coding gain without needing CSI at any node in the whole network to reduce the overall encoding and decoding complexity and overhead due to channel estimation [10], [11], [13]- [15], [22]- [25]. More recent techniques and types related to wireless relay and sensor networks have been studied [33]- [37].…”

“…In Figure 4 the proposed method suggested in subsubsection 2.1.4 is compared with the state-of-the-art coherent and non-coherent methods suggested in [10], [12]- [14], [33], [36] using the AF protocol and one bpcu. Figure 4 clearly shows that the performance of the proposed method outperforms the best known two-there and four-phase distributed space time coding schemes proposed in [10], [13], [14], [33], as well as the distributed beamforming method proposed in [12].…”

“…In Figure 4 the proposed method suggested in subsubsection 2.1.4 is compared with the state-of-the-art coherent and non-coherent methods suggested in [10], [12]- [14], [33], [36] using the AF protocol and one bpcu. Figure 4 clearly shows that the performance of the proposed method outperforms the best known two-there and four-phase distributed space time coding schemes proposed in [10], [13], [14], [33], as well as the distributed beamforming method proposed in [12]. It is clearly observed that the BER difference between the optimal beamforming method proposed in [36], which require all CSI at all transmitting and receiving antennas, and the proposed method, which does not require CSI at any transmitting or receiving antenna, is just 3 dB.…”