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Mimo
In radio, multiple-input and multiple-output (MIMO) () is a method for multiplying the capacity of a radio link using multiple transmission and receiving antennas to exploit multipath propagation. MIMO has become an essential element of wireless communication standards including IEEE 802.11n (Wi-Fi 4), IEEE 802.11ac (Wi-Fi 5), HSPA+ (3G), WiMAX, and Long Term Evolution (LTE). More recently, MIMO has been applied to power-line communication for three-wire installations as part of the ITU G.hn standard and of the HomePlug AV2 specification. At one time, in wireless the term "MIMO" referred to the use of multiple antennas at the transmitter and the receiver. In modern usage, "MIMO" specifically refers to a class of techniques for sending and receiving more than one data signal simultaneously over the same radio channel by exploiting the difference in signal propagation between different antennas (e.g. due to multipath propagation). Additionally, modern MIMO usage often refer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MIMO With Building
In radio, multiple-input and multiple-output (MIMO) () is a method for multiplying the capacity of a radio link using multiple transmission and receiving antenna (radio), antennas to exploit multipath propagation. MIMO has become an essential element of wireless communication standards including IEEE 802.11n (Wi-Fi 4), IEEE 802.11ac (Wi-Fi 5), Evolved HSPA, HSPA+ (3G), WiMAX, and LTE (telecommunication), Long Term Evolution (LTE). More recently, MIMO has been applied to power-line communication for three-wire installations as part of the ITU G.hn standard and of the HomePlug AV2 specification. At one time, in wireless the term "MIMO" referred to the use of multiple antennas at the transmitter and the receiver. In modern usage, "MIMO" specifically refers to a class of techniques for sending and receiving more than one data signal simultaneously over the same radio channel by exploiting the difference in signal propagation between different antennas (e.g. due to multipath propagat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MIMO-OFDM
Multiple-input, multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) is the dominant air interface for 4G and 5G broadband wireless communications. It combines multiple-input, multiple-output (MIMO) technology, which multiplies capacity by transmitting different signals over multiple antennas, and orthogonal frequency-division multiplexing (OFDM), which divides a radio channel into a large number of closely spaced subchannels to provide more reliable communications at high speeds. Research conducted during the mid-1990s showed that while MIMO can be used with other popular air interfaces such as time-division multiple access (TDMA) and code-division multiple access (CDMA), the combination of MIMO and OFDM is most practical at higher data rates. MIMO-OFDM is the foundation for most advanced wireless local area network (wireless LAN) and mobile broadband network standards because it achieves the greatest spectral efficiency and, therefore, delivers the highest ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolved HSPA
Evolved High Speed Packet Access, HSPA+, HSPA (Plus) or HSPAP, is a technical standard for wireless broadband telecommunication, and extends the original High Speed Packet Access, HSPA. The 3GPP standard organisation specified the original HSPA in release 7. HSPA+ can achieve data rates of up to 42.2 Mbit/s. HSPA+ upgrades existing 3G networks to achieve speeds closer to 4G without a new radio interface. HSPA+ should not be confused with LTE (telecommunication), LTE, which uses an air interface based on Orthogonal frequency-division multiple access, orthogonal frequency-division modulation and multiple access. HSPA+ introduces antenna array technologies such as beamforming and multiple-input multiple-output communications (MIMO). Beamforming focuses antenna power in a beam toward the user's direction. MIMO uses multiple antennas on the sending and receiving side. Further releases of the standard have introduced dual carrier operation, allowing communication over two 5&nbs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gregory Raleigh
Gregory “Greg” Raleigh (born 1961 in Orange, California), is an American radio scientist, inventor, and entrepreneur who has made contributions in the fields of wireless communication, information theory, mobile operating systems, medical devices, and network virtualization. His discoveries and inventions include the first wireless communication channel model to accurately predict the performance of advanced antenna systems, the MIMO-OFDM technology used in contemporary Wi-Fi and 4G wireless networks and devices, higher accuracy radiation beam therapy for cancer treatment, improved 3D surgery imaging, and a cloud-based Network Functions Virtualization platform for mobile network operators that enables users to customize and modify their smartphone services. Biography Raleigh received a B.S.E.E. degree from the California Polytechnic State University, an M.S.E.E. degree from Stanford University, and a Ph.D. from Stanford University. He joined Watkins-Johnson Company in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arogyaswami Paulraj
Arogyaswami J. Paulraj (born 14 April 1944) is an Indian-American electrical engineer, and inventor renowned for pioneering MIMO wireless technology, which underpins 4G LTE and 5G networks. A Professor Emeritus at Stanford University., he has made key contributions to wireless communications, signal processing and sonar technology. His honors include the Padma Bhushan , IEEE Alexander Graham Bell Medal , and induction into the National Inventors Hall of Fame. Early life and Education He joined the Indian Navy at age of 15 and pursued a career in electrical engineering. He earned his bachelor's degree from the Naval College of Engineering, Lonavala, and completed his Ph.D. in Electrical Engineering from IIT Delhi in 1973. His doctoral work in signal processing and communication systems laid the foundation for his later innovations in wireless technology. Military Career and Research in India While in the Indian Navy, Arogyaswami J. Paulraj made fundamental contributions to I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WiMAX
Worldwide Interoperability for Microwave Access (WiMAX) is a family of wireless broadband communication standards based on the IEEE 802.16 set of standards, which provide physical layer (PHY) and media access control (MAC) options. The WiMAX Forum was formed in June 2001 to promote conformity and interoperability, including the definition of system profiles for commercial vendors. The forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL". WiMAX was initially designed to provide 30 to 40 megabit-per-second data rates, with the 2011 update providing up to 1 Gbit/s for fixed stations. IEEE 802.16m or Wireless MAN-Advanced was a candidate for 4G, in competition with the LTE Advanced standard. WiMAX release 2.1, popularly branded as WiMAX 2+, is a backwards-compatible transition from previous WiMAX generations. It is compatible and interoperable with TD-LTE. Newer versions ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airgo Networks
Airgo Networks (formerly Woodside Networks), is a Palo Alto, California-based company specializing in the development of multiple-input multiple-output (MIMO) wireless technology. Airgo Networks was founded in 2001 by Gregory Raleigh, V.K. Jones, David Johnson, Geert Awater, Rolf de Vegt and Richard van Nee. Airgo was a lead proponent of the 802.11n standard. The company began shipping the world’s first MIMO-OFDM chipsets in 2003. In September 2005, Airgo Networks launched its third generation True MIMO chip set with support for data rates up to 240 Mbit/s. On December 3, 2006, Qualcomm announced that it would acquire Airgo Networks for an undisclosed amount. Airgo is now owned by Qualcomm, although still located in Palo Alto, while Qualcomm's headquarters is in San Diego San Diego ( , ) is a city on the Pacific coast of Southern California, adjacent to the Mexico–United States border. With a population of over 1.4 million, it is the List of United States cities b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HomePlug
HomePlug is the family name for various power line communications specifications under the HomePlug designation, each with unique capabilities and compatibility with other HomePlug specifications. Some HomePlug specifications target broadband applications. For instance in-home distribution of low data rate IPTV, gaming, and Internet content, while others focus on low power, low throughput and extended operating temperatures for applications such as smart power meters and in-home communications between electric systems and appliances. All of the HomePlug specifications were developed by the HomePlug Powerline Alliance, which also owns the HomePlug trademark. On 18 October 2016 the HomePlug Alliance announced that all of its specifications would be put into the public domain and that other organizations would be taking on future activities relating to deployment of the existing technologies. There was no mention in the announcement of any further technology development within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space-division Multiple Access
Space-division multiple access (SDMA) is a channel access method based on creating parallel spatial pipes (focused signal beams) using advanced antenna technology next to higher capacity pipes through spatial multiplexing and/or diversity, by which it is able to offer superior performance in radio multiple access communication systems (where multiple users may need to use the communication media simultaneously). In traditional mobile cellular network systems, the base station has no information on the position of the mobile units within the cell and radiates the signal in all directions within the cell in order to provide radio coverage. This method results in wasting power on transmissions when there are no mobile units to reach, in addition to causing interference for adjacent cells using the same frequency (so-called co-channel cells). Likewise, in reception, the antenna receives signals coming from all directions including noise and interference signals. By using smart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ArrayComm
ArrayComm is a wireless communications software company founded in San Jose, California. Co-founded in 1992 by Martin Cooper, a pioneer of the wireless industry. The company is wholly owned by Ygomi LLC, under principal investor T. Russell Shields. The current headquarters is Buffalo Grove, Illinois. ArrayComm sells the physical layer (PHY) for 4G/5G wireless systems, as well as multi-antenna signal processing software for specific components of 4G PHYs using Smart Antennas and MIMO techniques. Patent-licensing is another source of revenue. The company's hardware was sold in Australia and South Africa under the iBurst brand name which continues to be owned by Kyocera. ArrayComm also traded in Asia by selling base-station software for Personal Handy-phone System (PHS) base-stations. Executive timeline Alumni group Since inception, the company has had a large contingent of employees who have maintained close contact with each other owing to the paucity of companies in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Björn Ottersten
Björn Ottersten (born 1961) is a Swedish educator, researcher, and electrical engineer who is the co-inventor of Space/Spatial Division Multiple Access (SDMA) technology. He has made contributions in array signal processing and wireless communications and has received many notable awards in these areas. Currently, he is a Professor of Signal Processing at Royal Institute of Technology (KTH), Stockholm, Sweden, and the founding director of the Interdisciplinary Centre for Security, Reliability and Trust, at University of Luxembourg, Luxembourg. Early life and education Ottersten received the M.S. degree in electrical engineering and applied physics from Linköping University, Linköping, Sweden, in 1986. In 1989, he received the Ph.D. degree in electrical engineering from Stanford University, Stanford, CA. His advisor at Stanford was Thomas Kailath. Career Ottersten is a Fellow of the IEEE and EURASIP. From 2012, Ottersten has been an advisor to the European Commission, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bell Labs
Nokia Bell Labs, commonly referred to as ''Bell Labs'', is an American industrial research and development company owned by Finnish technology company Nokia. With headquarters located in Murray Hill, New Jersey, Murray Hill, New Jersey, the company operates several laboratories in the United States and around the world. As a former subsidiary of the American Telephone and Telegraph Company (AT&T), Bell Labs and its researchers have been credited with the development of radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages B (programming language), B, C (programming language), C, C++, S (programming language), S, SNOBOL, AWK, AMPL, and others, throughout the 20th century. Eleven Nobel Prizes and five Turing Awards have been awarded for work completed at Bell Laboratories. Bell Labs had its origin in the complex corporate organization of the Bell System telepho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
