- •1. Review of current systems for broadband wireless access
- •1.1 Comparison of key technologies WiMax and hspa
- •1.2 Comparison of the key technologies for WiMax and lte
- •1.3 Comparison of key technologies WiMax and Wi-Fi.
- •2.2 Standard 802.16: physical layer
- •2.3 Standard 802.16 Protocol mac sublayer
- •2.4 Standard 802.16: frame structure
- •In addition to the data ofdm6символ includes a guard interval duration Tg, so that the total duration of the ofdm symbol
- •3.2 Mesh network
- •3.3 Application Features multiple access ofdma
- •In addition to reviewing the methods of distribution of bearing, the standard and optional mechanisms - in particular, the so-called optional fusc, not fundamentally different from that considered.
- •3.4 Support for adaptive antenna system
- •In more detail the network architecture shown in figure 19:
- •Variant mimo with a single receiving antenna also known as the mode stc (Space Time Coding with space-time coding) and are particularly suitable in nlos conditions.
- •In turn, the values and are defined by the formulas
- •7.2 The choice of the equipment of base stations
1. Review of current systems for broadband wireless access
Within the market, the main competition WiMAX comes from existing, widely deployed wireless systems such as UMTS and CDMA2000, as well as a number of Internet-oriented systems, such as HiperMAN and long range mobile Wi-Fi Mesh and networks.
The major cellular standards currently developed so-called 4G, high bandwidth and low latency, all-IP networks with voice services built on top. All over the world to upgrade to 4G for GSM/UMTS and AMPS/TIA (including CDMA2000) is the 3GPP Long Term Evolution efforts. It is planned to replace CDMA2000-called Ultra Mobile Broadband has been discontinued. For 4G systems, available interfaces of air released in favor of OFDMA on the downlink and various techniques for OFDM Uplink similar to WiMAX.
In some parts of the world, the wide availability of UMTS and a General desire for standardization mean spectrum has not been allocated for WiMAX: in July 2005, the EU-wide distribution of frequencies for WiMAX was blocked.
One of the significant advantages of advanced wireless systems such as WiMAX is spectral efficiency. For example, 802.16-2004 (fixed) has a spectral efficiency of 3.7 (bit / s) / Hertz, and other 3.5-4G wireless systems offer spectral efficiency, which is similar to the tenth of a cent. A notable advantage of WiMAX comes from combining SOFDMA with smart antenna technology. This increases the effective spectral efficiency through reuse and smart deployment topologies of the network. Direct use of the frequency domain organization facilitates projects using MIMO-AAS compared to CDMA / WCDMA methods, resulting in more efficient systems.
Table 1. A comparison of the main suppliers of the Internet resource.
Standard |
Family |
Basic use |
Radio Technology |
Down (Mbps) |
Uplink (Mbps) |
Notes |
||
LTE |
UMTS/4GSM |
General 4G |
OFDMA / MIMO / SC-FDMA |
360 |
80 |
LTE-Advanced update to offer several Gbps speed. |
||
WiMAX |
802,16 |
Mobile Internet |
MIMO-SOFDMA |
144 |
35 |
WiMAX m pack we offer up to 1 Gbit / s fixed speeds. |
||
Flash-OFDM |
Flash-OFDM |
Mobile Internet mobility up to 200mph (350km / h) |
Flash-OFDM |
5,3 10,6 15,9 |
1,8 3,6 5,4 |
The mobile range of 18miles (30 km) extended range 34 miles (55 km) |
||
HiperMAN |
HiperMAN |
Mobile Internet |
OFDM |
56,9 |
56,9 |
|
||
Wi-Fi |
802,11 (11N) |
Mobile Internet (indoors) |
OFDM / MIMO |
288,9 (Supports 600MBps @ width 40MHz channel) |
Antenna, RF front accessories end and a small timer settings (310 km & 382km). |
|||
iBurst |
802,20 |
Mobile Internet |
HC-SDMA / TDD / MIMO |
95 |
36 |
Cell Radius: 3-12 кмSpeed: 250kmph Spectral efficiency: 13 bits / s / Hz / Cell |
||
EDGE Evolution |
GSM |
Mobile Internet |
TDMA / FDD |
1,9 |
0,9 |
3GPP Release 7 |
||
UMTS W-CDMA HSDPA + HSUPA HSPA + |
UMTS/3GSM |
General 3G |
CDMA / FDD
CDMA / FDD / MIMO |
0,384 14,4 42 |
0,384 5,76 11,5 |
HSDPA is widely deployed. Typical descending speed today 2 Mbit / s, ~ 200 kbit / s line connection "descending HSPA + up to 42 Mbps. |
||
UMTS-TDD |
UMTS/3GSM |
Mobile Internet |
CDMA / TDD |
16 |
16 |
Marked speed according to IPWireless using 16QAM modulation similar to HSDPA + HSUPA |
||
1xRTT |
CDMA2000 |
Mobile phone |
CDMA |
0,144 |
0,144 |
Successor EV-DO |
||
EV-DO 1x Rev. 0 EV-DO 1x Rev.A EV-DO CDMA2000Rev.B |
CDMA2000 |
Mobile phone |
CDMA / FDD |
2,45 3,1 4.9xN |
0,15 1,8 1.8xN |
Rev B note: N is the number of pieces of 1.25 MHz spectrum is used. Not yet deployed |