We introduce StreamDiffusion, a real-time diffusion pipeline designed for interactive image generation. Existing diffusion models are adept at creating images from text or image prompts, yet they often fall short in real-time interaction. This limitation becomes particularly evident in scenarios involving continuous input, such as Metaverse, live video streaming, and broadcasting, where high throughput is imperative. To address this, we present a novel approach that transforms the original sequential denoising into the batching denoising process. Stream Batch eliminates the conventional wait-and-interact approach and enables fluid and high throughput streams. To handle the frequency disparity between data input and model throughput, we design a novel input-output queue for parallelizing the streaming process. Moreover, the existing diffusion pipeline uses classifier-free guidance(CFG), which requires additional U-Net computation. To mitigate the redundant computations, we propose a novel residual classifier-free guidance (RCFG) algorithm that reduces the number of negative conditional denoising steps to only one or even zero. Besides, we introduce a stochastic similarity filter(SSF) to optimize power consumption. Our Stream Batch achieves around 1.5x speedup compared to the sequential denoising method at different denoising levels. The proposed RCFG leads to speeds up to 2.05x higher than the conventional CFG. Combining the proposed strategies and existing mature acceleration tools makes the image-to-image generation achieve up-to 91.07fps on one RTX4090, improving the throughputs of AutoPipline developed by Diffusers over 59.56x. Furthermore, our proposed StreamDiffusion also significantly reduces the energy consumption by 2.39x on one RTX3060 and 1.99x on one RTX4090, respectively.

In the current inter-vehicle communication (IVC) systems such as IEEE802.11p, the CSMA/CA scheme for the MAC scheme and the OFDM for the modulation scheme are most commonly used for the media access scheme and the modulation scheme respectively. These systems are assumed to be used in the application such as safety driving assistance, reducing traffic congestions and so on. On the other hand, since the required application in ITS must cover various field, development of the inter-vehicle communication scheme that has different characteristics from IEEE802.11p for high speed and large capacity data transmission is required for new applications such short range ad hoc network without base stations. In this paper, a new DS-CDMA IVC system using successive interference canceller (SIC) is proposed and its performance is compared with the CSMA/OFDM IVC. As the result of simulation, in the broad cast based wide range IVC, the CSMA/OFDM system can achieve better packet error rate (PER) performance than the proposed DS-CDMA IVC system. On the other hand, it was confirmed that the proposed DS-CDMA IVC system has better packet error rate performance with short latencies in the short range IVC where many short packets are exchange between vehicles.

In Japanese Digital Terrestrial Television Broadcasting (DTTB), the identification of multi-path is important to improve its reception characteristics. In order to enhance the resolution of the delay profile, it is effective that continuous multiple channel transfer functions are connected and the frequency bandwidth is extended. However, the guard band is existing between each channel and the transfer function is not obtained directly. The phases of each channel are not synchronized because the each channel is broadcasting independently. In this paper, the scheme to connect multiple channel transfer functions is proposed. In the proposed scheme, interpolation of guard band by using the linear prediction filter based on the RLS(Recursive Least Square) algorithm and compensation of phase between adjacent channels are performed. As the result, it was conformed that resolution enhancement of the delay profile is possible. It is possible to improve the time resolution of the delay profile that has 0.024[μs].

In this paper, LMS (Least Mean Square) adaptive array antenna is applied to IVC(Inter-Vehicle Communication) in order to reduce interference which is caused by surrounding vehicles. The LMS adaptive array antenna has a characteristic that the control of directivity is possible according to surrounding radio wave condition, if the receiving vehicle knows the information of the target vehicle. Under the case where the adaptive array antenna is used in IVC systems, packet error rate characteristic, throughput performance and improvement in near-far problem are evaluated by comparing with the performance of the IVC system using omni-directional antenna.

This paper discusses an interference DAA (Detection And Avoidance) technique for coexisting pulse based UWB and OFDM systems when the both systems are operated in the same frequency band. In a UWB transmitter-receiver, utilization of the OFDM system is detected by correlating with the GI (Guard Interval) signals. And also timing of the GI period is detected for interference mitigation. The UWB signal is emitted during GI period to mitigate the effect of interference to the OFDM system from the UWB system. The coexisting signal detection performances are evaluated by DER (Detection Error Rate), FAR (False Alarm Rate) and also RMSE (Root Mean Square Error) of detected GI period timing. The BER (Bit Error Rate) performances of the OFDM system are also evaluated to show the availability of proposed DAA technique.

Ultra Wideband (UWB) is an attractive technique that enable sharing spectrum with other radio systems to spread spectrum extremely wideband. However, there are potential interferences among those using in the same frequency bands and close range. This paper discusses the interference DAA (Detection And Avoidance) technique for coexisting pulse based UWB and OFDM systems. In a UWB transmitter-receiver, utilization of the OFDM signal is detected by correlating the GI (Guard Interval) signal, and the timing of GI period is also detected. The UWB signal is emitted during the GI period to mitigate the effect of interference to the OFDM signals from the UWB system. The DER (Detection Error Rate), FAR (False Alarm Rate) and BER (Bit Error Rate) performances are evaluated to show the availability of proposed DAA technique.

This paper discusses an interference DAA (detection and avoidance) technique for the ultra wideband (UWB) to share frequency bands with other radio systems. The effect of interference on DS (direct sequence) -UWB system to OFDM (multi band orthogonal frequency division multiplexing) modulated signal is evaluated. The proposed interference mitigation technique focuses on the symbol repetition cycle of DS-UWB. The effective symbol repetition interval is investigated to mitigate the effect of interference. The proposal DAA technique is aimed to the simple hardware structure only to control the symbol repetition cycle.

Ultra Wideband (UWB) is an attractive technique that enable coexistence with other radio systems to spread spectrum. However, there are potential interferences among those using the same frequency bands and close range. In some country regulations, the interference DAA (detect and avoidance) techniques are required to utilize UWB devices. This paper discusses the interference DAA technique. To utilize multi-carrier pulses made from several narrower sub-band pulses, that is possible to detect and mitigate the interference. The multi-carrier pulses are also suited for the transmitted pulse waveform, since they have advantages for adaptive wave forming. The proposal system is evaluated by the bit error rate performance and signal detection error rate to show their effectiveness. The WiMAX (world interoperability for microwave access) system is considered as an example of the interferer.

This paper discusses the reduction of interference from coexisting narrowband signal to UWB impulse radio. Two countermeasure techniques are proposed to reduce interference from narrowband signals on only the receiver side. One is to use a filter that rejects the interference signals. The second is to use modified template waveform at the receiver correlation. We propose to use multi-carrier type template waveform that has 11-sub-carrier pulses. When there are some interferers, it is possible to reduce the effect of the interferers by using a modified template waveform that is constructed with the multi-carrier type template removing some sub-carrier pulses that are close to the interfering spectrum. We show that the bit error rate performance is improved by the multi-carrier template.