Considering many benefit we can get especially the maximum speed, the implementation of Long Term Evolution will come soon in many mobile broadband providers. High latency is the most issue on current mobile broadband service and LTE technology can reduce it. To implement LTE technology, there some network element they should be prepared to achieve maximum benefit of LTE technology including back bone network from end user (BTS) to the core network and the international bandwidth from core network to internet gateway
There are some the key elements of LTE that should be implemented by mobile broadband provider while they plan to implement it:
1. OFDM (Orthogonal Frequency Division Multiplex) as the signal bearer
Orthogonal Frequency Division Multiplex (OFDM) is a form of transmission which uses a large number of close spaced carriers which are modulated with low rate data
2. OFDMA (Orthogonal Frequency Division Multiple Access)
3. SC-FDMA (Single Frequency Division Multiple Access).
OFDM (Orthogonal Frequency Division Multiplex) is being used in many other wireless internet service such as Wireless LAN (WLAN). OFDM is used in WIMAX service as well especially to broadcast technologies including DVB and DAB. OFDM has many benefits including its robustness to multipath fading and interference. Moreover even though, it may appear to be a particularly complicated form of modulation, OFDM lends itself to digital signal processing techniques
Meanwhile the OFDM signal, there are several option that possible to be chosen between three types of modulation:
- QPSK (= 4QAM) 2 bits per symbol
- 16QAM 4 bits per symbol
- 64QAM 6 bits per symbol
There are several channels bandwidths that have been chosen for LTE are:
- 1.4 MHz
- 3 MHz
- 5 MHz
- 10 MHz
- 15 MHz
- 20 MHz
The modulation scheme that can be used by LTE is called SC-FDMA (Single Carrier Frequency Division Multiplex) which is a hybrid format. SC-FDMA combines the low peak to average ratio offered by single-carrier systems with the multipath interference resilience and flexible subcarrier frequency allocation that OFDM provides
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