Abstract
In this article, we focus on the cooperative multi-user network model and propose a relay-assisted partial packet recovery scheme in which asynchronous interleave-division multiple-access (IDMA) with iterative chip-by-chip multiuser detection (MUD) is used for the recovery of partial packets from multiple sources. In packet transmission, only a few erroneous bits may cause the entire packet to be discarded and partial packet recovery can reduce waste in resource by retransmitting only the bits that are unreliable, As the retransmitted partial packets for different sources can be of different lengths, IDMA is particularly suitable because of the simplicity of chip-by-chip MUD and because there is no need for strict synchronization. Our detailed scheme, which includes a feedback request strategy for indicating the unreliable bits, is presented and its performance is investigated. The simulation results show that the network throughput can be significantly improved by the proposed scheme, compared to traditional CDMA-based automatic repeat request (ARQ). Moreover, under the context of cognitive radio networks, we propose a hybrid strategy in which interleave division multiplexing (IDM) is used during whole-packet retransmission, and demonstrate the effectiveness of the proposed scheme with and without the hybrid strategy as well as give insights about the throughput performance under different parameter settings.
Highlights
Direct-sequence code division multiple access (DSCDMA) wireless networks are widely deployed today, such as IEEE 802.11b in [1]
In [8], a truncated cooperative automatic repeat request (ARQ) scheme with relay-assistance is proposed in which the source and multiple relays use an orthogonal space-time block code (STBC) to retransmit an entire packet
The contributions in this article are as follows: 1) We propose to apply the principle of interleave-division multiple-access (IDMA) as a novel partial packet recovery method
Summary
Direct-sequence code division multiple access (DSCDMA) wireless networks are widely deployed today, such as IEEE 802.11b in [1]. In [8], a truncated cooperative ARQ scheme with relay-assistance is proposed in which the source and multiple relays use an orthogonal space-time block code (STBC) to retransmit an entire packet. The proposed IDMA-based partial packet recovery integrates the cooperative transmission technique by our relay-assisted retransmission protocol. If retransmissions are required, the relays will use IDMA-based partial packet scheme to retransmit partial packets to the destination on behalf of the sources. Phase If a request message is feeded back by the destination, the relay performs the partial packet retransmission with IDMA. When many unreliable bits uniformly scatter over the packet, the method proposed in [3] which calculates the retransmission cost of every possible sub-block will take a great deal of effort. Will converge to the final feedback request strategy solution after only few iterations, so our method is more easy to apply
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