


Volume 20 No 20 (2022)
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XILINX DESIGN ANDIMPLEMENTATION OF EFFICIENT AWGN PERFORMANCE OF NETWORKON-CHIP WBCDMA SYSTEM
Ch. Niranjan Kumar , V. Sowmya Devi , Afreen Kubr , K.Nikitha
Abstract
Code Division Multiple Access (CDMA) is proposed as the physical layer enabler of Network-On-Chip
(NoC) interconnects for its prominent features such as fixed latency, guaranteed service, and reduced
system complexity. CDMA interconnects have been adopted by the NoC community as it originates in
wireless communications where each bit in a CDMA encoded data word is transmitted on a separate
channel to avoid interference. However, the wireless interference problem can be efficiently mitigated
in on-chip interconnects eliminating the need for replicating the CDMA channel. Moreover, wireless
channels are sequential by nature which is not the case in on-chip interconnects where parallel buses
are the default communication means. After CDMA was adopted by the NoC community, the same
wireless CDMA scheme has been maintained where each data bit is encoded in a separate CDMA
channel and the encoding/decoding logic is replicated for data packets. In this work, we present a novel
CDMA encoding/decoding scheme called Aggregated CDMA (ACDMA) for NoC interconnects in which all
packet bits are encoded in a single CDMA channel, consequently, eliminating the area and energy
overheads resulted from replicating the channel encoding/decoding logic.The overhead of channel
replication is mitigated which results in up to 60.5% area and 55% power savings with 89% improvement
in throughput per area compared to the conventional CDMA crossbar. As a future work, we plan to build
and evaluate a full ACDMA-based NoC under different workloads and routing protocols.
Keywords
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