A Diversity Scheme to Enhance the Reliability of Wireless NoC in Multipath Channel Environment

Abstract

Wireless Network-on-Chip (WiNoC) is one of the most promising solutions to overcome multi-hop latency and high power consumption of modern many/multi core System-on-Chip (SoC). However, the design of efficient wireless links faces challenges to overcome multi-path propagation present in realistic WiNoC channels. In order to alleviate such channel effect, this paper presents a Time-Diversity Scheme (TDS) to enhance the reliability of on-chip wireless links using a semi-realistic channel model. First, we study the significant performance degradation of state-of-the-art wireless transceivers subject to different levels of multi-path propagation. Then we investigate the impact of using some channel correction techniques adopting standard performance metrics. Experimental results show that the proposed Time-Diversity Scheme significantly improves Bit Error Rate (BER) compared to other techniques. Moreover, our TDS allows for wireless communication links to be established in conditions where this would be impossible for standard transceiver architectures. Results on the proposed complete transceiver, designed using a 28-nm FDSOI technology, show a power consumption of 0.63mW at 1.0V and an area of 317 µm 2. Full channel correction is performed in one single clock cycle.

Multi-carrier spread-spectrum transceiver for WiNoC

“…Consequently, the P t does not require to be highly incremented, as previously explained. Moreover, in case of multicast mode, an 8-bit code size will provide better signal resilience considering the PG effects, as well as it can allocate more parallel channels [5]. The digital transceiver architecture is modeled in C/C++, synthesized from C to RTL by Catapult HLS and to the gate level by Synopsys Design Compiler.…”

“…Afterwards, this digitized signal is forwarded to the DSSS decoder and hard decision sub-blocks. The DSSS decoder follows the architecture from [5], but without considering the channel compensation techniques. Each DSSS decoder and hard decision sub-block outputs are forwarded into their respective deserializer DESER(1:32), DESER(2:32), DESER(8:32) and buffer blocks.…”

Attacks Toward Wireless Network-on-Chip and Countermeasures

“…A parameterizable wireless channel model is proposed in [19] to evaluate the losses in WiNoC and to simulate the platform better. In [20], authors have shown the impact of a semi-realistic multipath wireless channel over conventional WiNoC modulation scheme and have proposed a digital transceiver architecture. A survey of the modeling of wireless channel for WiNoC is presented in [21].…”

Adaptive Transceiver for Wireless NoC to Enhance Multicast/Unicast Communication Scenarios

“…The amount of energy preserved by the reflected path after to be rebounded by the chip-edge structures, mainly depends of the physical structures and substrate losses. A rough approximation of this preserved energy was performed in [20], defining this energy as a ratio (α) between the amplitudes of the reflected and the direct path. In the rest of the paper, this ratio is considered as α = 60% which, according to [20], corresponds to the worst condition of a channel without any mechanism to avoid chipedge reflections.…”

“…Nevertheless, to the best of our knowledge, current WiNoC transceiver solutions do not incorporate any channel compensation mechanism considering different communication traffics. In [20], the author introduce a WI with different multi-path cancellation techniques which only supports many-to-one wireless communication patterns. In this paper, we propose a reconfigurable digital transceiver that is able to compensate for channel interference considering unicast/broadcast and multicast requirements.…”