Physical Channel Types of LTE

The physical layer uses resource blocks to transmit binary coded information in QPKS, 16QAM or 64QAM or OOK modulation form. Physical channels determine how data is processed and then mapped...
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BCCH, cell, fdma, harq, lte, lte pdsch resource assignment type, OFDM Symbols, PBCH, PDSCH, Physical Channel LTE, resource block, sounding reference signal, synchronization Channel, telecom, uplink

How Transport Channel Processing in LTE?

Transport channels are block oriented transmission services and transmit one or more transport blocks per transmission time interval (TTI). The TTI is 1 ms (e.g. one sub-frame). Transport blocks may...
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BCH Processing Model, fdma, interleaving, lte, lte bch, ofdma, sc-fdma lte, telecom, transport channel

MIMO Principles

The basic mechanism behind MIMO is linear algebra. If we e.g. transmit N (=2) signals S0, S1 via two antennas and receive the signal at M (=2) antennas R0, R1...
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mimo, MIMO LTE, telecom

Layer and channel relationship in LTE

The radio interface is composed of different layers in order to set up, reconfigure and release the radio bearer services. The protocol layer is composed of physical layer (layer 1),...
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lte, lTE Layer, pdcp, protocol, rrc, telecom, uplink

Synchronization in LTE Mobile “Switch On”

Primary and Secondary Synchronization Signals occupy 2 blocks of symbols per 10 ms (central 72 subcarriers for all channel bandwidths). An example is shown below for 72 subcarrier- (1.4 MHz)...
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cell, lte, subcarrier, switch on LTE mobile, synchronization, telecom

PLMN selection in “IDEL Mode” for LTE-UE

When an UE is switched on, it attempts to make contact with a PLMN. The selection of the PLMN could be either automatically or manually. • Automatic mode: Utilizes a...
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cell, lte, LTE PLMN, LTE REselection, LTE Selection, plmn selection, telecom

How to LTE Radio Air Interface?

The state-of-the-art design of the LTE air interface is characterised by OFDMA (DL) and SC-FDMA (UL) together with MIMO. The downlink modulation is based on OFDMA (Orthogonal Frequency Division Multiple...
Article Topics :

bpsk, carrier, cell, CHANNEL, coding, downlink, fdma, harq, lte, mimo, ofdma, parp, qam, qpsk, rf amplifier, sc fdma, telecom, umts, uplink, user

Pulse shaping and spectrum in LTE

RF engineering is a trade off between: required radio spectrum (bandwidth), speed of data transmission (bit rates) and complexity of implementation. The pulse form used to modulate complex data symbols...
Article Topics :

amplitude, bandwidth, cdma, cell, filter, gmsk, gsm, lte, pu;se, pulse shaping filter use in lte rc rrc, radio system, receving, rf engineering, shaping, spectrum, symbol, telecom, transmission, waveform

Inter-Carrier Interference for OFDM

The price for the optimum subcarrier spacing is the sensitivity of OFDM to frequency errors. If the receiver’s frequency is some fractions of the subcarrier spacing (subcarrier bandwidth) then we...
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cost, frequency, interference, ofdma, ppm, receiver, signal, subcarrier, telecom, transmitter

Difference Between OFDM and FDM in LTE

Conventional multi-carrier operation as it is used for FDM works simply by selecting a number of center frequencies – one for each carrier to be used. The center frequencies must...
Article Topics :

aci, bandwidth, carrier, difference between conventional fdm and ofdm, difference between ofdm and fdm ppt, fdm, frequency, lte, ofdma, shaping filter, subcarrier, symbol, telecom

OFDM implementation in Detail

A typical OFDM transmitter is shown on the following figure. To reduce the amount of RF hardware required for OFDM the modulation process is split into two parts. A first...
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dac, filter, generator, hardware lte, lte, ofdm idft, ofdma, recevier, sampling, signal, spreading, subcarrier, symbol, telecom, transmitter, wave

Uplink Power Control Calculation in LTE

Transmit power of PUSCH in subframe i is defined by PPUSCH (i) = min{PMAX,10 log10 (MPUSCH (i)) + PO_PUSCH ( j) +α ( j) ⋅ PL + ΔTF (i) +...
Article Topics :

accumulation of tpc a-mpr, cell, lte, lte enable closed loop uplink power control, maximum ue tx power on lte pusch, power control, telecom, ue lte, Uplin UE, uplink, uplink Power Control LTE

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