Principle of Power control in LTE

Power control – already being applied in 2nd and 3rd generation networks – has high potential for improvement of the performance of mobile networks. Main benefits are: 1. It can bring down the interference in up- and downlink and hence enhances the capacity of the networks. 2. Additionally it helps to keep down the uplink-power […]

Article Topics :

Principle of Power control in LTE, closed loop, power control, resource element, uplink power, transmission power, term resource, element energy, control determines, closed loop

Which Cell Parameters needs to Obtain in LTE?

To provide the most critical information to the UEs, the eNodeB uses the BCH channel The information is sent on pre-defined time-frequency resources. This information is organized into different information blocks: The MIB, the Master Information Block. System Frame Number DL -downlink System Bandwidth Number of Transmit Antennas at eNodeB Periodicity: 4 RFs SIB1 How […]

Article Topics :

Cell Parameters needs to Obtain in LTE, parameter lte, transmit, antennas, enodeb, system frame number, downlink

What is Cyclic prefix in LTE ?

The guard period after each rectangular pulse carrying the modulated data symbol is a simple and efficient method to deal with multi-path reception. The cyclic prefix (CP) simply consists of the last part of the following symbol. The size of the cyclic prefix field depends on the system and can even vary within one system. […]

Article Topics :

What is Cyclic prefix in LTE, symbol, receiver, correlation, interference, FFT synchronization,

Implementation Margin in LTE

Implementation margin is used to include non-ideal receiver effects such as channel estimation errors, tracking errors, quantization errors, and phase noise.  This implementation margin or sensitivity degradation can be used to apply some margin to the link budget to account for devices from other vendors that may have larger tolerances from the specifications or for […]

Article Topics :

Implementation Margin in LTE, noise, margin, error, phase, tracking error

RE – groups & CFI – Control Format Indication in LTE

RE – groups & CFI – Control Format Indication in LTE is as below. RE – groups In order to support DL control information mapping, RE-groups are defined. Four useful symbols are bundled, useful in the sense that RE’s carrying the cellspecific reference symbols are not available. The one cell-specific RS case is mapped in […]

Article Topics :

cfi group, lte cfi, lte re groups, control format indication, subframe, pdcch, pcfich, antenna port

How Many LTE Downlink Transport Channel ? How its Work?

There are major four channel in LTE Downlink trasport channel. which list below with its work in short. Paging Channel ( PCH) Supports UE discontinuous reception (DRX) to enable UE power saving. Broadcasts in the entire coverage area of the cell. Mapped to physical resources which can be used dynamically also for traffic/other control channels. […]

Article Topics :

lte downlink, pch channel, bch channel, dl sch channel, downlink transport, lte channel downlink, mch channel, multicast, channel, working of lte channel

Single and Multiple User MIMO in the Uplink SU MIMO LTE

SU-MIMO is within LTE, but at the time of this writing has not yet been fully identified. To implement the SU-MIMO UE require two transmitters. This is an important problem from the standpoint of cost, size and battery consumption, and for these reasons, SU-MIMO is not currently a priority for development. Moreover, increased rates of […]

Article Topics :

Uplink SU MIMO, uplink, su mimo, two transmitters, receiver ENB, different UE, frequency, capacity

Single User and Multi User MIMO codewords in LTE

Figure shows how the two codewords are used for a single user in the downlink. It is also possible that the code words to be assigned to different users to create multi-user MIMO (MU-MIMO). Depending on the channel information available in the eNB, modulation and precoding layers may be different to match the performance. Precoding […]

Article Topics :

Single User and Multi User MIMO codewords in LTE, mimo, precoding choices, channel, two layers, Single User MIMO, Multi User MIMO

Spectrum Analysis of Spreading & Dispreading in WCDMA-3G

How Spreading & Dispreading in WCDMA-3G ? Traditional radio communication systems transmit data using the minimum bandwidth required to carry it as a narrowband signal. CDMA system mix their input data with a fast spreading sequence and transmit a wideband signal. The spreading sequence is independently regenerated at the receiver and mixed with the incoming […]

Article Topics :

Spectrum Analysis of Spreading & Dispreading in WCDMA-3G, Spectrum Analysis, radio, communication, systems, transmit data

Orthogonal Code Usage – Coding & Decoding in WCDMA

How Orthogonal Code works in WCDMA? 1.Coding By spreading, each symbol is multiplied with all the chips in the orthogonal sequence assigned to the user. The resulting sequence is processed and is then transmitted over the physical channel along with other spread symbols. In this figure, 4-digit codes are used. The product of the user […]

Article Topics :

Orthogonal Code Usage - Coding & Decoding in WCDMA, transmitter, receiver, code, usage wcdma, wcdma codes

Codeword, layer, and precoding in LTE

Terms codeword, layer, and precoding have been taken to refer specifically to LTE signals and processing. The figure shows the processing steps to which they relate. The terms used in the following ways: Codeword: codeword represents the user data before it is formatted for transmission. One or two code words, CW0 and CW1, may be […]

Article Topics :

Codeword, layer, and precoding in LTE, codeword, Layer, Precoding, Eigen beamforming, channel, mimo in lte, user mimo, beamforming, LTE signals

The MIMO channel Matrix

The MIMO channel Matrix Consider for a moment in time, on the same frequency and channel modeling as a black box with durable internal components. If we add two completely different input signals is to be mixed with each other in a certain manner depending on the value of Z1 to Z4. If we send […]

Article Topics :

The MIMO channel Matrix, mimo, lte mimo, mimo channel, consider channel mimo, lte optimization

27 queries in 0.666 seconds.