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MIMO System

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Published in: Electronics
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Multiple Input And Multiple Output-A Presentation

Mishal A / Noida

33 years of teaching experience

Qualification: B.Tech/B.E. (BIT MESRA - 2014)

Teaches: All Subjects, Chemistry, Computer Science, Mathematics, Physics

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  1. MIMO, Carrier Aggregation, Audio codecs, Features of LTE release 13 RISHABH SAXE-NA
  2. MIMO Legacy wireless devices use Single-lnput Single-Output (SISO) technology. They can only send or receive one spatial stream at a time. Multiple-Input Multiple-Output (MIMO) is a wireless technology that uses multiple transmitters and receivers to transfer more data at the same time. All wireless products with 802.1 1 n support MIMO. The technology helps allow 802.1 In to reach higher speeds than products without 802.1 1 n. For optimal performance, both the station(mobile device) and the access point(AP) must support MIMO. MIMO technology uses a natural radio-wave phenomenon called multipath. With multipath, transmitted information bounces off walls, ceilings, and other objects, reaching the receiving antenna multiple times at different angles and slightly different (l General MIMO system outline
  3. Carrier Aggregation Carrier Aggregation is one of the major features of LTE Advanced, which allows mobile network operators to combine a number of separate LTE carriers. This enables them to increase peak user data rates and overall capacity of their networks and to exploit fragmented spectrum allocations. It can be applied to either the FDD or TDD variants of LTE and it can be used to combine carriers whether or not they are contiguous or even in the same frequency band. Ultimately, the aim is for Carrier Aggregation to combine up to five separate LTE carriers, each of up to 20MHz. R8/R9 LTE-Advanced R8/R9 max 5 CC, max 100 MHz Component Carrier. CC CC BW; 1.4, 3, 5, 10, 15, 20 MHz Same DL and UL allocoation. eNodeB Different DL and UL allocoation. Carrier Aggregation- FDD(CCs can be of different BWs)
  4. Audio Codecs It's a device or computer program that encodes or decodes audio. In software, an audio codec is a computer program implementing an algorithm that compresses and decompresses digital audio data. The objective of the algorithm is to represent the high-fidelity audio signal with minimum number of bits while retaining quality. In hardware, audio codec refers to a single device that encodes analog audio as digital signals and decodes digital back into analog. In other words, it contains both an analog-to-digital converter (ADC) and digital-to-analog converter (DAC) running off the same clock signal. This is used in sound cards that support both audio in and out, for instance. Several software techniques used in software codecs are Lossy(MP3), Lossless(FLAC) and uncompressed(WAV) audio.
  5. Features of LTE release 13 LTE in unlicensed spectrum - the opportunistic use of unlicensed spectrum is becoming an important complement to meet the growing traffic demand. Carrier Aqqreqation enhancements - The goal in Release 13 is to expand LTE CA up to 32 CCs and hence provide a major leap in the achievable data rates for LTE as well as in the flexibility to aggregate large numbers of carriers in different bands. LTE enhancements for Machine-Type Communications (MTC) - define a new low complexity UE category type that supports reduced bandwidth, reduced transmit power, reduced support for downlink transmission modes, ultra-long battery life via power consumption reduction techniques and extended coverage operation. Elevation Beamforminq/ Full-Dimension MIMO - while the standard currently supports MIMO systems with up to 8 antenna ports, the new study will look into high-order MIMO systems with up to 64 antenna ports at the eNB, to become more relevant to the use of higher frequencies in the future. Enhanced multi-user transmission techniques - downlink multi-user transmission using superposition coding to see if it can increase spectral efficiency of LTE system. Indoor positioning - improvements to the existing methods or new positioning methods in order to achieve better positioning accuracy. Single-cell Point-to-Multipoint (SC-PTM) - potential benefits and solutions of SC-PTM operation based on the LTE downlink shared channel.

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