What is PN offset in CDMA?

What is PN offset in CDMA?

PN Offsetspecifies the PN1) part number, or 2) packet number Sequence Offset Index in units of 64 PN chips of a pilot relative to the zero offset pilot PN sequence. This selection is available only for Forward link only.

What is pilot channel used for?

The pilot channel provides a reference signal that helps the mobile station detect, synchronize, and demodulate the received signal. The pilot carries no information. The pilot channel is kept at a constant power approximately 4 to 6 dB greater than the carrier’s traffic channels.

IS-95 CDMA forward channel?

IS95: Forward link. The Forward IS95 Channel consists of several code channels: The Pilot tone is always transmitted by the base station on each active Forward CDMA Channel. It is an unmodulated spread spectrum signal (i.e., it does not contain spreading by the short Walsh Hadamerd code).

What is the function of a forward pilot channel of pitch?

Forward Channel Pilot Channel − Pilot channel is a reference channel. It uses the mobile station to acquire the time and as a phase reference for coherent demodulation. It is continuously transmitted by each base station on each active CDMA frequency. And, each mobile station tracks this signal continuously.

What are the features of CDMA?

The main features of the CDMA system are given below :

• The CDMA system users share the same frequency either TDD or FDD can be used.
• CDMA has a soft capacity limit.
• In the CDMA system the number of users increases, the system performance decreases.
• While using in CDMA system near-far problem arises at the receiver end.

IS-95 CDMA power controlled?

As specified in the IS-95 standards, mobile acts when it wants to get into the system, it sends a signal called access. In CDMA, each user’s transmission power is allocated by the control power to achieve the same power (Pr) which is received by the base station/BTS with access probe with low power.

Which CDMA method is used in IS-95 commercial systems?

IS 95 is a cellular phone system based on Direct Sequence CDMA multiple access. Thus, multiple users simultaneously share the same (wideband) channel. Designers from Qualcomm claim a 20 fold increase in capacity over analog cellular telephony.

What is the difference between CDMA and GSM?

GSM vs CDMA: Main differences GSM handsets came with a SIM card slot, while CDMA phones did not. In other words, CDMA is a handset-based standard, with a phone number linked to a particular device.

What is difference between GSM and CDMA?

The basic difference between GSM and CDMA is that the GSM is a SIM specific i.e. a mobile phone is identified in the network by the removable SIM inserted in that phone. On the other hands, CDMA uses EVDO which provide higher data bandwidth hence it has faster data transmission rate.

What are the advantages of CDMA?

Advantages of CDMA : Less interference due to hand off features reduces call dropping. Gives better coverage and needs few antenna sites and also consumes less power. Increase user capacity because of more users per MHz of bandwidth than any other system so that it has 4 to 5 times capacity than GSM.