What is DSSS in WIFI?
Direct sequence spread spectrum (DSSS) is a transmission technology used in local area wireless network transmissions. In this technology, a data signal at the sending station is combined with a high data rate bit sequence, which divides user data based on a spreading ratio.
How DSSS is useful in WLAN?
Wireless Networks With DSSS, the data is divided and simultaneously transmitted on as many frequencies as possible within a particular frequency band (the channel). DSSS adds redundant bits of data known as chips to the data to represent binary 0s or 1s.
How does DSSS work in CDMA?
Our method uses DS-CDMA based on direct-sequence spread spectrum (DSSS). The method is physical layer and a multiple-access technique (i.e., the code division multiple channel access technique) to divide the channel into subchannels, and transmits data through these subchannels.
Does 802.11 a use DSSS?
802.11a uses OFDM technology and operates in the 5 GHz band with a maximum net data rate of 54 Mbits/sec. 802.11b uses DSSS technology and operates in the 2.4 GHz band with a maximum net data rate of 11 Mbits/sec.
Does WIFI use DSSS or FHSS?
Wi-Fi uses Direct Sequence Spread Spectrum (DSSS) instead of FHSS. Its carrier does not hop or change frequency and remains centered on one channel that is 22 MHz-wide.
What are the disadvantages of DSSS techniques?
Following are the disadvantages of DSSS: ➨It is very sensitive technology in the presence of harsh environments such as collocated cells, larger coverage areas, multipath and in the presence of frequencies used for bluetooth network. This is due to the fact that it operates at narrow bandwidth.
What is the key advantage of DSSS?
Benefits of Direct Sequence Spread Spectrum DSSS (and spread spectrum technology in general) provides significant resistance to transmission interference and jamming. As long as they don’t contain the defined spread spectrum key, all intentional or unintentional interference and jamming signals will be rejected.
Can we share a bandwidth in DSSS?
Not spectrally efficient for one user, but DSSS also allows many users to share the same bandwidth (MAC technique).
What do you need to know about DSSS?
1 Direct sequence spread spectrum basics. Direct sequence spread spectrum is a form of transmission that looks very similar to white noise over the bandwidth of the transmission. 2 DSSS direct sequence spread spectrum encode / decode process. 3 DSSS spreading gain. 4 Direct sequence spread spectrum applications.
How is the spread code used in DSSS?
The first part of the process is to generate the DSSS signal. Take as an example that the data to be transmitted is 1001, and the chip or spreading code is 0010. For each data bit, the complete spreading code is used to multiple the data, and in this way, for each data bits, the spread or expanded signal consists of four bits.
How is DSSS used in cellphone technology?
CDMA cellphone technology: The DSSS technique was used to provide a multiple access scheme that was used for 3G cellophane technology. Each mobile used a different access code or spreading code and this enabled multiple users to access the base station on the same frequency. Read more about . . . .
How does the chipping code work in DSSS?
Whenever a user wants to send data using this DSSS technique, each and every bit of the user data is multiplied by a secret code, called as chipping code. This chipping code is nothing but the spreading code which is multiplied with the original message and transmitted. The receiver uses the same code to retrieve the original message.