KEYWORDS: Video, Extremely high frequency, Video compression, Ka band, Phased array optics, Sensors, Data transmission, Cameras, Antennas, Heterodyning
With the large-scale commercialization of 5G and the continuous evolution of the ultra-high-definition video industry, the next five years will be a period of strategic opportunities for the technological development and achievement transformation of the ultra-high-definition video industry. 5G mm-wave such as 28GHz in Ka-band will drive the rapid development of ultra-high-definition video industry applications. In this paper, we experimentally demonstrate a real-time full-duplex photonic-assisted 28GHz mm-wave communication system for video services. The experimental results show that our system supports real-time data error-free transmission of 1.25Gbaud and bit error rate level of 10-12 at 2.125 Gbaud under the case of 5km fiber and 1.6m wireless distances. Additionally, we also demonstrate the real-time full-duplex transmission of 1080p uncompressed video with the overall bandwidth of 1.485Gbps. It means this system can enable at least 8 channels of 8K video or 20 channels of 4K video to be live and on-demand at the same time after using video compression techniques. According to the above results, we believe that this system can promote the development of 5G mm-wave real-time ultra-high-definition video services for indoor or outdoor scenarios.
In this paper, 28GHz millimeter wave (MMW) in n257 band which is one of the recommended frequency bands for beyond 5G, has been demonstrated by experiment for optical wireless access. The MMW antenna with the bandwidth of 26.5 ~ 29.5GHz and an envelope detector with a 3dB bandwidth of about 500MHz are used to enable 4-ary pulse amplitude modulation (PAM4) signal transmission over 5km fiber and 1.6m wireless distances in our experiment. In order to compensate the linear and nonlinear impairments of the optical wireless links, the long short-term memory (LSTM) neural network nonlinear equalizer is adopted in the receiver DSP. Additionally, the traditional linear equalizer (LE) and Volterra equalizer (VE) are also conducted for comparison. The results show that neither the performances of LE nor VE can reach the 7% hard-decision forward error correction (HD-FEC) threshold (3.8×10-3) in the case of 5 Gbaud PAM4 transmission over 5km fiber and 1.6m wireless distances. Instead, after adopting the LSTM equalizer, the bit error rate can be reduced to approximate 1×10-3, which reveals a noticeable performance improvement. Moreover, the performances of the three kinds of equalizers at different transmission rates are further studied. We find that the LSTM can help improve the system capacity from below 9Gbps to above 10Gbps at 7% HD-FEC threshold, which means more than 10 percent improvement has been achieved. According to the above results, we believe that the LSTM equalizer will facilitate the large-capacity communication for the upcoming 5G MMW in fiber wireless access networks.
Wireless communication and sensing show more and more similarities in system design and signal processing flows. A common transmitter sharing is preferred for communication and sensing to reduce equipment cost, hardware size, and power consumption. In this paper, we propose and demonstrate a joint photonic transmitter for wireless communication and sensing at mmW-band based on heterodyne detection. The key device of the photonic transmitter is a dual-drive Mach- Zehnder modulator (DMZM) and a multichannel tunable optical filter (MTOF). The two arms of the DMZM are driven by a specially coded sine wave and a specially coded single chirped linear frequency modulation (LFM) wave, respectively. Besides, both of the two amplitude-coded waves are simultaneously modulated onto the two lasers coupled into the DMZM. By filtering out appropriate sidebands using the MTOF, an amplitude-shift-keying (ASK) signal for wireless communication and a dual-chirp LFM for sensing at mmW-band can be simultaneously generated after heterodyne detection. When the product of the two baseband signals used to code the sine and LFM waves is fixed, the envelope of the mmW LFM wave for radar sensing keeps constant. The simulation results show that a 11.5-Gbit/s ASK signal and a dual-chirp LFM signal with constant envelope are successfully generated at the same time. By properly setting the frequencies of the lasers and the sine wave, the generated ASK signal can be centered at 28GHz for 5G mmW communication, and the generated LFM wave can be distributed around 79GHz for vehicle radar sensing. Thanks to the dual chirps of the mmW LFM wave, range-Doppler decoupling is achieved.
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