Novel decoding algorithms for decode-and-forward cooperative beamforming systems

作者：Lee Kyungchun^*

来源：IET Communications, 2014, 8(17): 3012-3018.

DOI：10.1049/iet-com.2014.0327

• array signal processing
• cooperative communication
• decode and forward communication
• network coding
• packet radio networks
• relay networks (telecommunication)
• decoding algorithm
• decode and forward based CBF system
• cooperative beamforming
• relay node
• transmitted packet decoding
• source node
• destination node
• decoding error
• packet retransmission
• packet error rate
• coded bits
• likelihood ratio
• optimal decoding strategy
• destination node
• signal decoding performance

In this study, two novel decoding algorithms for cooperative beamforming (CBF) systems are proposed. In decode-and-forward-based CBF, multiple relay nodes decode the packets transmitted from the source node and forward them to the destination node. However, decoding errors at the relay nodes cause erroneous retransmission of packets, which degrades the signal decoding performance at the destination node. To solve this problem, the optimal decoding strategy is derived; this strategy takes the potential errors in forwarded signals into account in the computation of the likelihood ratio of coded bits. Furthermore, to reduce the required computational complexity, a suboptimal decoding algorithm, which assumes that only one of the multiple relayed signals potentially contains errors in each time slot, is also proposed. In simulation results, it is observed that the proposed decoding algorithms for CBF provide performance improvements in terms of the achievable packet error rates with respect to the conventional schemes.

• 出版日期2014-11-27