Description
CDMA (Code Division Multiple Access) was a Military technology used during World War II where a technique called spread spectrum was used by which a signal (an electrical, electromagnetic or acoustic signals) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used to have secure communications, increasing resistance to natural interference, noise and jamming. The signal is spread using Pseudo - random Noise (PN). It's a sequence of bits having 1's and 0's. The signal is then passed through the raised cosine filter for pulse shaping to minimize intersymbol interference. The thesis involved spreading of signal using two techniques and comparing their bit error rates. First spreading technique is by increasing the PN sequence (chip rate) and the second spreading technique is by increasing the roll-off factor (measure of excess bandwidth). The thesis is simulated using MATLAB for both the spreading techniques, results are obtained and compared.
