There are many different communication standards using LDPC codes. In this webdemo we discuss the following three standards:
1. Docsis 3.1, Data Over Cable Service Interface Specification
2. WiFi, IEEE 802.11n
3. WiMax,IEEE 802.16
Docsis 3.1
It is an telecommunication standard which allows some addition of high-bandwidth data transfer to an existing cable TV. It is the latest version which was released on 2013.
Specification:
In Docsis 3.1 the channel bandwidth for downstream is 24 MHz to 192 MHz and upstream is 6.4 MHz to 96 MHz. It uses OFDM modulation techniques for both upstream (up to 256 QAM) and downstream (up to 4096 QAM).
WiFi 802.11n
It stands for wireless fidelity, a wireless networking technology, which provides wireless high-speed Internet and network connections. 802.11n makes use of the MIMO concept, i.e., the number of Tx antenna and Rx antenna is more than one. As a result, data rate and throughput have increased through spatial multiplexing.
Different Code rates for WiFi 802.11n
| Block Length | Submatrix Size | Code Rates |
|---|---|---|
| 648 | 27 | 1/2, 2/3, 3/4, 5/6 |
| 1296 | 54 | 1/2, 2/3, 3/4, 5/6 |
| 1944 | 81 | 1/2, 2/3, 3/4, 5/6 |
WiMAX
The WiMax is developed in order to server the increasing demand to higher data rates in mobile communication.