Menkominfo: Lelang Frekuensi 2,3 GHz Bukan Buat Jaringan 5G
"Saya perlu tekanan di sini, pelelangan spektrum frekuensi 2,3 Ghz tidak ada hubungannya dengan deployment 5G," ujar Johnny dalam Rapat Kerja Komisi I DPR RI dengan Menkominfo RI, Senin (1/2/2021).
"Pelelangan spektrum 2,3 Ghz untuk menambah atau melengkapi kebutuhan operator seluler akan keperluan spektrum demi pengembangan usaha mereka, termasuk untuk pemanfaatan 4G dan pada saatnya untuk 5G silahkan," jelasnya.
Johnny juga menegaskan jika pelelangan tidak dibatalkan. Namun akan ada pelelangan ulang yang diungkapkan alasannya demi akuntabilitas transparansi aktivitas tersebut.
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"Khusunya, Peraturan Pemerintah Nomor 80 Tahun 2015," jelas pengumuman yang disampaikan Pelaksana Tugas Biro Humas Kominfo Ferdinandus Setu.
Ketiganya memberikan harga penawaran Rp 144,867 miliar.
Khususnya pada pita frekuensi radio 2,3 HGz pada rentang 2.360 - 2.390 MHz, dapat diberikan manfaat yang sebesar-besarnya bagi masyarakat dan bangsa Indonesia
Masing-masing operator mendapatkan satu blok yakni Smartfren berada diperingkat pertama selanjutnya akan mengelola di blok A. Sementara Telkomsel di Blok C dan Tri berada di Blok B.
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Alokasi pita frekuensi yang dilelang sebesar 30 MHz yang terdiri dari tiga blok, yakni blok A, B, dan C. / Menurut Direktur Jenderal SDPPI Kominfo, Ismail, analog switch off mampu memberikan penghematan sebesar 112 MHz di pita frekuensi 700 Mhz. ------------https://infokomputer.grid.id/read/122490869/pemerintah-bakal-gelar-5g-tahun-depan-ini-wilayah-yang-terpilih?page=all
Orthogonal frequency-division multiplexing has become the standard modulation format for 5G New Radio. Lean how OFDM works and how it’s used.
Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation format used in modern wireless communication systems including 5G.
OFDM combines the benefits of Quadrature Amplitude Modulation (QAM) and Frequency Division Multiplexing (FDM) to produce a high-data-rate communication system.
QAM refers to a variety of specific modulation types: BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (16-state QAM), 64QAM (64-state QAM), etc. Refer to Refs. 1 and 2 for more information on QAM.
FDM is simply the idea that multiple communication channels can coexist by designating a slice of frequency spectrum for each channel. A common example of this is FM broadcast radio: the overall (US) frequency allocation is 87.8 MHz to 108 MHz, divided into channels that are 0.2 MHz wide (Figure 1). FDM frequency allocations must not overlap and often have guard bands between the channels to minimize adjacent channel interference.
OFDM
The basic concept of OFDM was first proposed by R. W. Chang [see Ref 3],
recognizing that bandlimited orthogonal signals can be combined with significant overlap
while avoiding interchannel interference. Using OFDM, we can create an
array of subcarriers that all work together to transmit information
over a range of frequencies.
These subcarriers must be orthogonal functions. The precise mathematical definition for orthogonality between two functions is that the integral of their product over the designated time interval is zero. More loosely, we can consider orthogonal functions to be statistically unrelated.
Figure 2 shows how N equally-spaced subcarriers can be combined to form an array of parallel signals. Each of the subcarriers is modulated using QAM. These modulated subcarriers can be used to support independent baseband signals but more typically they are combined to provide the maximum data throughput for one stream of data
ref good bacaan :
https://www.5gtechnologyworld.com/the-basics-of-5gs-modulation-ofdm/
https://www.businessinsider.com/what-frequency-is-5g?r=US&IR=T
- Low-band 5G operates between 600-850 MHz. This is similar to what 4G networks currently use and is only moderately faster than 4G, between 50-250 Mbps offering similar coverage areas for each cell tower. Not all cities and regional operators are deploying low-band 5G towers; some are opting to start with mid-band towers. Even so, it's possible for a 5G device to connect to a low-band 5G network and achieve speeds similar to 4G/LTE.
- Mid-band 5G operates in the 2.5-3.7 GHz range and delivers speeds between 100-900 Mbps. While offering less range per cell tower, this type of 5G is going to be the most common implementation of 5G networks for many years to come. It's a reasonable compromise between network speed and range in both medium-density urban areas and less dense rural regions.
- High-band 5G is the band that is most commonly associated with 5G. Operating at 25-39 GHz, this is known as "millimeter wave" spectrum and delivers gigabit speeds (currently tested as high as 3 Gbps). The tradeoff is that millimeter wave transmitters have very limited range and require the deployment of many small transmitters, so it's only viable in urban areas where transmitters can be near closely spaced homes and buildings.
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