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CDMA

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

Evner: Ingeniørarbejde, MySQL, PHP, Projekt Ledelse, Software Arkitektur, Software Testning

Se mere: white wave, principles of programming, peak 10, management concepts, direct performance, channel 4 programming, bit frequency, bit bits, auto key programming, simulate matlab, new matlab, multiple channel, management performance review, find new programming, correlation, c++ and ds, additive, simulate awgn channel, matlab frequency spectrum, matlab frequency

Om arbejdsgiveren:
( 7 bedømmelser ) waterford, Ireland

Projekt ID: #3963796

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