pn

How to Reverse Access Channel Work in CDMA?

Reverse Access Channel used by MS Initiate Communication or Respond to Paging Channel. A reverse channel is first spread with WALSH to 307.2Kbps and then becomes 1.2288Mcps after long code...
Article Topics :

active, cdma, cdma paging area, CHANNEL, forward, handoff, lai, neighbor, PAGING, pilot, pn, reverse, search window, sim

How Sync Channel work in CDMA?

A long code is used for scrambling. However, a long code has too long a period, which cannot be wholly used for scrambling. We can only sample some chips of...
Article Topics :

active, cdma, cdma2k long code state sync message lc_state, CHANNEL, forward, handoff, lai, neighbor, PAGING, pilot, pn, reverse, search window, sim

What is T_ADD,T_DROP and T_TDROP in CDMA?

Pilot Detection Threshold (T_ADD) Any Pilot that is strong but is not in the Handoff Direction Message is a source of interference. This Pilot should be immediately moved into the...
Article Topics :

active, cdma, CHANNEL, forward, handoff, lai, neighbor, PAGING, pilot, pn, reverse, search window, sim

Long Code & Short Code In CDMA

The long code is a PN sequence with period of 242-1chips The functions of a long code: Scramble the forward CDMA channel Control the insertion of power control bit Spread...
Article Topics :

active, cdma, cell, code, handoff, interleaving, long, modulation, pn, power, power control, qpsk, scrambling, short, soft, softer

Signal Fading

Slow fading: In case shadow effect is caused by obstacles, and the receiving signal strength decreases but the field strength mid-value changes slowly with the change of the topography, the...
Article Topics :

fading, fast fading, slow fading, frequency selective, strength, frequencyalgorithmic, apn, decrease, effect, epc, fading, gsm, hlr, pn, shadow, slow fading, WCDMA / 3G

CDMA Channel Frequencies & Calculation

The 850MHz CDMA band is most popularly used all over the world.This band as mentioned in the previous slide works between       824-849MHz Used for the Reverse link communication      ...
Article Topics :

CDMA Channel Frequencies, mhz, frequency, channels, reverse, forwardapn, BCCH, cdma, CHANNEL, epc, forward, frequency, generate, lte, orthogonal, pn, pn code, processing gain, rho, traffic, vrf, walsh

Downlink Logical Channel in GSM

In 2G GSM Technology in forward direction Downlink (GSM BTS to GSM Mobile). There are mainly five Downlink Logical Channel in GSM. Frequency correction channel (FCCH) Synchronous channel (SCH) Broadcast...
Article Topics :

paging channel, doanlink, gsm doanlink channel, logical bts to mobile gsm channel, bts to mobile forward channel, downlink gsm channel, 2g downlink channel, fcch, bcch, agch, pch, schBCCH, bsic, CHANNEL, channel coding, channel in gsm, frequency hopping, hlr, hopping, interference, interleaving, logical, physical, pn, vlr

Scrambling (M) sequence in CDMA

  Two points are important here:  Maximum number of shift register (N)  Mask The period of out put sequence is 2N-1 bits Only sequence offset is change when the mask...
Article Topics :

active, cdma, cell, code, handoff, interleaving, long, modulation, pn, power, power control, qpsk, scrambling, short, soft, softer

QoS Parameters of LTE

The QoS Class Identifier (QCI) is a scalar that is used as a reference to access node-specific parameters that control bearer level packet forwarding treatment (e.g. scheduling weights, admission thresholds,...
Article Topics :

apn, bearer, enodeb, eps, lte, lte radio, margin in lte, pn, qos, telecom, traffic, traffic in lte

Notion of Orthogonality in LTE

In FDM, the sub-carriers are separated in the frequency domain to avoid interference between the sub-channels It results in a loss of spectrum efficiency because the frequency guard band can...
Article Topics :

orthogonality, sub-carrierbenefit, cell, fdm, frequency guard band, lte, notion, ofdm, orthogonality, pn, sub-channels, telecom

Constellation in LTE

The QPSK is the most robust modulation. It can be represented by a constellation: The radius, R, represents the amplitude. The angle, ?, represents the phase. There are 1 amplitude...
Article Topics :

Constellation in LTE, amplitude, constellation, lte, modulation, phase, pn, qam, qpsk, radius, symbol, telecom

How to Reverse Channel works in CDMA

All MS transmit on same frequency but with different PN codes to create different logical channels. Some channels marked for Access are used for signaling and control. While Walsh Codes...
Article Topics :

reverse channel cdma, pn code, walsh codecdma, cell, CHANNEL, pn, reverse

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