A3. Amongst the different relaying protocols, amplify-andforward(AF) scheme is chosen at the relay node due toits implementation simplicity [19].A4. It is assumed that the processing power required bythe transmit/receive circuitry at the relay is negligibleas compared to the power used for signal transmissionfrom the relay to the destination. This is justifiable whenthe transmission distances are large such that the energytransmitted is the dominant source of energy consumption[6], [15].A5. The channel gains, h and g are modeled as quasi-staticblock-fading and frequency non-selective parameters. Thechannel is constant over the block time T and independentand identically distributed from one block to thenext, following a Rayleigh distribution. The use of suchchannels is motivated by prior research in this field [2],[3], [6], [11], [12], [15].A6. It is assumed that the channel state information is availableonly at the destination. The destination node canestimate the dual-hop channel at the start of informationtransmission in each block by utilizing the pilots sentfrom the source node over the dual-hop link. We haveassumed perfect channel knowledge at the destinationand assumed negligible overhead for pilot transmission,which is inline with the previous work in this researchfield [2], [3], [6], [11], [12], [15].
đang được dịch, vui lòng đợi..
