Enabling Reliable High Throughput On-chip Wireless Communication for Many Core Architectures

Wireless Networks-on-Chip (WNoCs) have been shown to overcome the scaling challenges of wired NoCs by augmenting them with low latency, low energy, long range wireless links. However, existing wireless implementations face challenges in terms of reliability while providing high communication performance. Single channel communication, the pre-dominant way of implementing WNoCs, are susceptible to channel effects like dispersion, fading, etc. and also provide limited bandwidth. Multi-channel communication, though provides high throughput, are prone to inter-channel and inter-symbol interference. In order to handle both performance and reliability challenges, we propose wireless network design using Orthogonal Frequency Division Multiplexing (OFDM) modulation. The proposed design enables reliable and channel resilient wireless communication, while providing high throughput, concurrent transmissions in WNoC. OFDM, by dividing wide band channel into several smaller sub-channels, overcomes channel dispersion and ISI effects. In the proposed design, OFDM sub-channels are grouped into multiple contiguous bands and assigned to each transceiver in WNoC. By allowing each transceiver to transmit only over assigned group, we enable simultaneous, high bandwidth communications. Evaluations show that proposed design achieves BER of the order 10^-12. Using the concurrent wireless link design, the runtime is improved by 29% and network energy is reduced by 68% as compared to baseline mesh topology.