What is Channel Coding

To check and correct errors during the transmission, redundancy data and the information calculated from the source data are added to the stream so as to increase the bit rate. For the voice, the length of these codes is 456 bits every 20ms. The bit rate of code stream output from the voice coder is […]

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redundancy, stream, coding, stream, coder, voice

Affects of the Channel in LTE MIMO

To understand the impact of the channel, let’s assume that the base station receiver is facing many challenges in the same MIMO receiver that universal areas, but also must receive data simultaneously from multiple users. In terms of MIMO UM, each signal is derived from a separate UE, because each signal is completely independent channel, […]

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Affects of the Channel in LTE MIMO, base station, orthogonal, test signals, receiver, mimo receiver, the channel, normal operation lte channel, direct mimoe

How Cross domain signal analysis in LTE

Regarding cross domain analysis, we see that, I traditionally signal from a receiver RF section can be demodulated and Q components using analog techniques. Today, however, the down conversion signal is digitized by an ADC IF, and usually then fed into the section of the baseband demodulation and decoding. In Cross domain signal Measurement ADC […]

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cross domain, LTE cross domain signal analysis, vsa software, domain signal, signal analysis, rf measurements, digital domain, digital data, analyzers

CDMA Traffic Channel Definitions Effective Traffic,Actual Traffic and Physical Traffic

Traffic Channel Definitions In analog systems, the traffic channels (or voice channels) are synonymous with the physical transceiver hardware. The nature of CDMA technology implies that the effective traffic carrying capacity of a CDMA carrier varies in accordance with the interference density in the band and also depends on various CDMA system parameters. From the […]

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actual traffic channels, channels, traffic channels, soft handoff, channels required, primary traffic, erlangs generated effective traffic

How Many CODES in CDMA?

There Are Three Codes in CDMA PN Long Code,PN Short Code & Walsh Code. PN Long Code The Long Code is a PN sequence that is 242 – 1 bits (chips) long. The long code is used to encrypt user information.  Both the base station and the mobile unit have knowledge of this sequence at […]

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PN Long Code, PN short codes, walsh codes, cdma coding system, cdma code type, cdma code defination, coding in cdma, code work for cdma system

Power ramping in LTE

Open loop power control together with optional power ramp-up is used during the random access process at the beginning of the connection until more accurate control information is available. Power loss due to transmission distance depends on to the increase of the distance between NodeB and the UE. In such a case, feedback information from another side is not […]

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Power ramping in LTE, power control, open loop, transmission power, power loss, initial transmission

List of Parameters and Terms for PN Offset Planning in CDMA

There are various parameters and terms which come into play when discussing PN offsets and their function in CDMA. System Time All base station digital transmissions are referenced to a common CDMA system-wide time scale that uses the Global Positioning System (GPS) time scale, which is traceable to and synchronous with Universal Coordinated Time (UTC). […]

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System Time ,Time Reference ,pilot pn ,Active Set ,Candidate Set ,Neighbor Set ,Remaining Set pilot arrival ,search window ,mobile station ,time reference ,pilot strength ,pilot offset ,neighbor search multipath component

What is the Result of Incorrect PN Planning in CDMA ?

The design of a PN offset plan for CDMA is comparable to that of a signalling channel frequency plan in analog. The consequences of poor offset planning include the following: Active Set Pilot Interference – This phenomenon would occur in the active area and involve the active search window (SRCH_WIN_A). The interfering signal would need […]

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pn planning cdma, neighbour area cdma, nbr list cdma, signal, bs identification

Wide bandwidths concept for LTE MIMO

One of the unique aspects of LTE is the support of the six channel bandwidths from 1.4 MHz to 20 MHz. To simplify system operation and roaming phones should support all these bandwidths, although effective deployment in any one area may be limited to fewer band width 20 MHz LTE is significantly larger than the […]

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lte, lte signal, reference signal, enb and ue, digital signal processing, phase fitness, filters, amplifiers, ue receiver

Advantages of Intelligent Network (IN)

Concept of Intelligent Network: The introduction of new services and access to the GSM service are based on the concept of Intelligent Network (IN). This is because of the independence between: Conventional call processing handled by the exchange, Mobile radio functions handled by a dedicated server. Dialog between these two is managed by an IN […]

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Intelligent Network (IN), Advantages of Intelligent Network, Mobility management, radio frequencies, radio control, GSM servers

How To Set Pilot Search Window Sizes in CDMA ?

When the handset first powers up, it does an exhaustive search for the best pilot. No windows are used in this process. On the paging channel, the handset learns the window sizes SRCH_WIN_A, N, R and uses them when looking for neighbors both in idle mode and during calls. When a strong neighbor is requested […]

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How To Set Pilot Search Window Sizes in CDMA, search window, pilot set, intercell distances, mobile, evod throughput, tips to increase throughput in evdo, hsd search window, search window table, criateria to set search window

Open loop and close loop testing in LTE

Here I write short notes on how to test open loop and close loop testing in lte and what idea behind it. In open loop no any data send back and in closed loop all relevant data available to both side lets check in some detail. Open and close loop testing in LTE: Open loop […]

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Open loop and close loop testing in LTE, open loop, close loop, loop, lte, source, feedback, receiver, testing equipment, testing of lte, baseband, demodulation

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