For wireless networks, transmission speed is the most critical factor. However, as modern network technology advances, streaming video over a network 鈥?such as watching a high-definition movie 鈥?demands significantly greater bandwidth. This poses a considerable burden on wireless connections, which has driven the development of wireless HD video transmission technologies.
1. There are several major mature technologies for wireless HD transmission today: the low-latency WHDI technology, the high-bandwidth WirelessHD technology, Intel’s WiDi technology, the widely supported WiGig technology, and the barely qualifying DLNA technology.
WHDI stands for “Wireless Home Digital Interface.” This technology is based on the proprietary WHDI standard, operates in the 5GHz frequency band, and can transmit signals through walls up to a range of 30 meters. With a bandwidth of 3Gbps, it enables lossless, uncompressed HD signal transmission.
2. The most notable feature of the WHDI standard is its specified latency of less than 1ms, while maintaining full compatibility with the HDMI interface. Low latency ensures a good audio-video synchronization and a lag-free operational experience during entertainment activities. It also achieves a relatively long transmission distance and possesses a certain degree of wall-penetration capability.
3. Currently, WHDI technology supports 1920脳1080 lossless video transmission and 7.1-channel PCM high-definition audio transmission. It also provides a 100k backchannel for HDCP control protocol communication. In the future, WHDI technology will be upgraded to support 4K2K resolutions.
4. WirelessHD, as the name suggests, means “wireless high definition” and is one of the technologies widely favored by the industry. WirelessHD is based on the 802.15.3c standard, uses the high-frequency 60GHz band, and has a theoretical bandwidth of up to 28Gbps, which is more than sufficient for the lossless transmission of full HD data.
5. WiDi, also known as “Intel WirelessDisplay,” is a wireless HD transmission technology developed by the renowned chip manufacturer Intel based on the WiFi standard. It requires specific Intel processors and operating systems to function. This technology has now evolved to version 2.0.
Operating on the 2.4G/5GHz frequency bands, it can provide a bandwidth of 300Mbps. Due to the limited bandwidth, WiDi must compress data when transmitting HD audio and video signals. In its initial 1.0 era, WiDi could only achieve 720P HD data transmission; the current 2.0 version can now handle 1080P HD transmission.
6. WiGig stands for Wireless Gigabit. This technology is based on the IEEE802.11ad standard and is a high-speed, short-range wireless technology operating in the high-frequency 60GHz band.
Currently, WiGig supports a bandwidth of up to 7Gbps, enabling lossless uncompressed transmission of HD audio and video. However, its transmission distance is relatively short, only about 3-5 meters, and it can integrate well with WiFi