Wireless Communication Notes ECE 8th Semester Notes, EC6801 Wireless Communication Lecture Notes. Anna University ECE 8th Semester Notes and syllabus are downloading. Regulation 2013 as well we provided important 2 marks and 16 marks questions with answer for all units. Here you will get notes for all units.
Wireless Communication Notes ECE 8th Semester Notes
EC6801 Wireless Communication Notes ECE 8th Semester Notes for free download.
If an area is served by a single Base Station, then the available spectrum can be divided into N frequency channels that can serve N users simultaneously. If more than N users are to be served, multiple BSs are required, and frequency channels have to be reused in different locations.
Since spectrum is limited, the same spectrum has to be used for different wireless connections in different locations. This method of reusing the frequency is called as frequency reuse.
A handoff refers to the process of transferring an active call or data session from one cell in a cellular network to another or from one channel in a cell to another. A well- implemented handoff is important for delivering uninterrupted service to a caller or data session user. Modes of hand off are:
- MCHO – Mobile Controlled Hand off
- NCHO – Network Controlled Hand off
- MAHO – Mobile Assisted Hand off
For a large geographic coverage area, a high powered transmitter therefore has to be used. But a high power radio transmitter causes harm to environment. Mobile communication thus calls for replacing the high power transmitters by low power transmitters by dividing the coverage area into small segments, called cells.
Each cell uses a certain number of the available channels and a group of adjacent cells together use all the available channels. Such a group is called a cluster.
Cell splitting, Sectoring, Coverage Zone approaches are the techniques used to expand the capacity of cellular system.
Cell splitting – Cell-splitting is a technique which has the capability to add new smaller cells in specific areas of the system. i.e. divide large cell size into small size.
Sectoring – use of directional antennas to reduce Co-channel interference.
Coverage Zone approaches – large central BS is replaced by several low power transmitters on the edge of the cell.
If the cell size and the power transmitted at the base stations are same then co-channel interference will become independent of the transmitted power and will depend on radius of the cell (R) and the distance between the interfering co-channel cells (D).
If D/R ratio is increased, then the effective distance between the co-channel cells will increase and interference will decrease. The parameter Q is called the frequency reuse ratio and is related to the cluster size. For hexagonal geometry
Electronics and Communication Engineering Notes
Electronics and Communication Engineering Notes all the semester are available here. Departments are Study about object oriented programming and data structures, linear data structures, microprocessor, digital communications and transmission lines and Guide waves.
Electronics & Communication engineering department deals with the electronic devices, circuit, and communications equipment like transmitters, receiver, and integrated circuits.
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