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What is spreading signal in CDMA?
A spreading sequence is a binary sequence that appears random but can be reproduced in a deterministic manner by intended receivers. These spreading sequences are used to encode and decode a user’s signal in asynchronous CDMA in the same manner as the orthogonal codes in synchronous CDMA (shown in the example above).
What are the advantages of MC-CDMA over CDMA?
MC-CDMA system is the strongest candidate for next generation wireless mobile communication systems due to its merits of high spectral efficiency and robustness against inter symbol interference (ISI) due to the presence of code division multiple access systems (CDMA) and orthogonal frequency division multiplexing ( …
Why spread spectrum is used in CDMA?
By spreading the spectrum of the transmitted signal, one can reduce its power density such that it becomes less than the power density of the noise. In this way, it is possible to hide the signal in the noise. It can be demodulated if you know the code that was used to send the signal.
How MC-CDMA and OFDM is different each other?
The assignment of one or several sub-carriers to each user in an OFDM system leads to the multiple access scheme OFDMA. In contrast, an MC-CDMA transmission scheme spreads the user- data symbol energy over all channel resources and therefore offers diversity.
What is MC CDMA single line text?
Multi-carrier code-division multiple access (MC-CDMA) is a multiple access scheme used in OFDM-based telecommunication systems, allowing the system to support multiple users at the same time over same frequency band. MC-CDMA spreads each user symbol in the frequency domain.
Which modulation is used in CDMA?
CDMA Overview Techniques generally used are direct sequence spread spectrum modulation (DS-CDMA), frequency hopping or mixed CDMA detection (JDCDMA). Here, a signal is generated which extends over a wide bandwidth. A code called spreading code is used to perform this action.
What does CDMA mean?
Code Division Multiple Access
CDMA stands for “Code Division Multiple Access.” GSM stands for “Global System for Mobiles.” They are 2 radio networks used by wireless carriers.