CDMA
$30-120 USD
Paid on delivery
the title of the project is? *DS-CDMA with variable code length. Simulation of,performance inAWGN channel**.**the key words are? *
DS-CDMA, Spread spectrum, processing gain, wideband
The task is to simulate the de-spreading of a CDMA sequence in the presence of AGWN, and to investigate how, by increasing the code length, it is possible for the system to operate in larger and larger noise [url removed, login to view] is to be done using MATLAB programming .
## Deliverables
***DS-CDMA with variable code length. Simulation of,performance inAWGN** **channel.***
**Key concepts & Keywords:** DS-CDMA, Spread spectrum, processing gain, wideband
**Overall task**
The task is to simulate the de-spreading of a CDMA sequence in the presence of AGWN, and to investigate how, by increasing the code length, it is possible for the system to operate in larger and larger noise levels.
**Revise the following:**
**1 Review principles of DS-CDMA** ( direct sequence - code division multiple access),
*e.g.? * chapter 2 of [1].
**Keywords:** pseudo-noise (PN) codes, autocorrelation, cross-correlation
**2 Review properties of AWGN** ( additive white Gaussian noise) [2]. Auto
correlation, Gaussian.
**Keywords:** Random signals, time domain,& frequency domain properties of noise, white noise, bandlimited noise. **Goal here:** Find out how to generate (simulate) noise.
**Simulation**
Begin by simulating DS-CDMA de-spreading the absence of noise.
Begin with short sequence ( *e.g.* 4 -bit) pseudo-noise (PN) codes.
Recall synchronisation & de-spreading can be achieved by multiplying the desired
DS-CDMA with the timeshifted versions on the incoming sequences ( made up of bits
from many DS-CDMA signals) and integrating to find the auto-correlation peak.
Add noise onto the incoming signals, and examine the effect on performance.
Increase noise level.
Increase code length ( *i. e.* find new longer PN codes)
*i need a program using matlab which generates the wave forms as in fig 2.12 shown in the attachment? below.
*
**References**
[1] *]* Bannister *et al,? Convergence Technologies for 3G Networks,* Wiley 2004. *••••* [2] Taub & Schilling, *Principles of Cummunications Systems,* McGraw Hill 1986
Project ID: #3963796