Abstract
This paper extends the work on cross-layer design which combines adaptive modulation and coding at the physical layer and hybrid automatic repeat request protocol at the data link layer. By contrast with previous works on this topic, the present development and the performance analysis as well, is based on rate compatible punctured turbo codes. Rate compatibility provides incremental redundancy in transmission of parity bits for error correction at the data link layer. Turbo coding and iterative decoding gives lower packet error rate values in low signal-to-noise ratio regions of the adaptive modulation and coding (AMC) schemes. Thus, the applied cross-layer design results in AMC schemes can achieve better spectral efficiency than convolutional one while it retains the QoS requirements at the application layer. Numerical results in terms of spectral efficiency for both turbo and convolutional rate compatible punctured codes are presented. For a more comprehensive presentation, the performance of rate compatible LDPC is contrasted with turbo case as well as the performance complexity is discussed for each of the above codes.
Highlights
The success of current standard such as 3GPP HSPA and IEEE 802.11/16 in terms of high data rates provision and quality of service (QoS) requirements satisfaction is principally owed to Adaptive Modulation and Coding (AMC), hybrid automatic repeat-request (HARQ) and fast scheduling [1,2]
Known standards of wireless communications [2,10], we extend this study by employing the aforementioned crosslayer design (CLD) that combines AMC and HARQ based on Rate-Compatible Punctured Turbo (RCPT) codes
We evaluate the system performance in terms of spectral efficiency when the AMC scheme is combined with type II HARQ (i.e. Incremental Redundancy (IR) HARQ)
Summary
The success of current standard such as 3GPP HSPA and IEEE 802.11/16 in terms of high data rates provision and quality of service (QoS) requirements satisfaction is principally owed to Adaptive Modulation and Coding (AMC), hybrid automatic repeat-request (HARQ) and fast scheduling [1,2]. The AMC realization uses different constellation orders and coding rates according to the signal strength [3]. By this way, when instantaneous channel conditions are proper, link adaptation offers high data rates at the physical layer. RCPT codes have been employed for HARQ implementations due to the fact that no received information is discarded [6] Such ARQ schemes are well-known as Incremental Redundancy (IR) HARQ schemes that improves the channel use efficiency since parity bits for error correction are transmitted only if this is required [7].
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