CDMA

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

Interleaving in CDMA

It can be seen from the figure that the data are read row by row into an interleaver at the transmit end,read column by column out (this process is called...
Article Topics :

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

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

Why Power Control Essential in CDMA ?

Power control is essential for the smooth operation of a cdma system. Because all users share the same rf band through the use of pn codes Each user looks like random...
Article Topics :

measures data errors, power, control, cdma system, base station, power control, overcome, increase, measures data, data errorscdma channel frequency calculator, downlink power control in lte, lte power control, power control, power control in cdma, power control in LTE, uplink Power Control LTE

What is RAKE RECEIVER and its Purpose in CDMA

Rake Receiver Instead of trying to overpower or correct multipath problems, CDMA takes advantage of the multipath to improve reception quality in fading conditions. CDMA does this by using multiple...
Article Topics :

direct signals in rake receiver, base station, rake receiver, transmitted signal, reduced data, using multiple, overpower, searcher, synchronized, strongest signals, strong correlation, special circuitscdma, cdma rf planning, rake, rake receiver cdma, rake receiver invented in, rf guide, rf optimization, what is fading and its types

Second-Generation Broadband Systems

Second-generation broadband wireless systems were able to overcome the LOS issue and to provide more capacity. This was done through the use of a cellular architecture and  implementation of advanced-signal...
Article Topics :

3g, antenna, broadband, cdma, cell, difference between, fixed, point, solution, system, telecom, wifi, Wimax

Soft/Softer Handoff in CDMA

Multi-path combination in the BSC during soft handoffMulti-path combination in the BTS during softer handoffs       Soft handoff means that during the handoff of a mobile station at the coverage...
Article Topics :

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

Forward Power Control in CDMA

Message Transmission Mode MS measures the frame quality and informs the base station to the result i.e. whether it is in the threshold or periodical  mode. Base station determines whether ...
Article Topics :

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

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

The Core technology of 3G: CDMA

Formulated by the European standardization organization 3GPP, the core networkevolves on the basis of GSM/GPRS and can thus be compatible with the existingGSM/GPRS networks. It can be based on the...
Article Topics :

3gpp, architecture, atm, cdma, gsm, ip, network, packet, service, tdm, 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

Functions of the cdma2000 Signaling Services Layer

Functions of the cdma2000 Signaling Services Layer The Signaling Services Layer processes all messages exchanged between the mobile and the base station. These messages control such things as call setup...
Article Topics :

cdma2000 Signaling Services Layercdma, function signal, mobile, pn, state

20 queries in 0.479 seconds.