1.1 Comparison of key technologies WiMax and hspa

System with HSPA (3GPP release 6) commercially available since 2007. The technology provides a frequency dupliciranje (FDD) with the width of each duplex channel 5 MHz. In the downward channel is used modulation QPSK or 16-QAM, streaming speeds of 14 Mbps. In the ascending channel, BPSK modulation, the peak speed of 5.8 Mbps.

At the same time on the market were the WiMAX system (release 1.0) with a temporary dupliciranjem (TDD). Under similar bandwidth 10 MHz they provide the speed in the downward channel is 2-3 times higher than HSPA (as WiMAX TDD when the total bandwidth is dynamically shared between downward and upward channels).

Table 2. Comparison of HSPA systems (releases 7 and 8) and WiMAX (release 1.5)

Settings	HSPA					WiMAX
Version	Релиз 7			Релиз 8		Релиз 1.5
The GHz Range	2.0					2.5
Dupliciranje	FDD					FDD		TDD
The channel bandwidth MHz	2х5					2х5		10
Antenna BS	1х2	2х2			2х2
Antenna AC	1х2					1х2
Modulation and encoding rate
In a descending channel	64 QAM 5/6	16 QAM 3/4	64 QAM 5/6		64 QAM 5/6
In an upside channel	16 QAM 3/4					64 QAM 5/6
Peak rate, Mbps
In a descending channel	17,5	21	35		36		48
In an upside channel	8,3	8,3	8,3		17		24

The development of technology has created HSPA+ (HSPA release 7 and some of the amendments release 8). In a descending channel they are distinguished by modulation 64-QAM c SIMO (1x2) or 64-QAM SIMO c (2x2). The ascending channel added modulation 64-QAM and enhanced features for VoIP. Amended in accordance with release 8, you can use in a descending channel mode MMO (2x2) with modulation 64-QAM, the possibility of using Mobilisa orders of magnitude in a descending channel and MMO (2x2) - the ascending channel.

When comparing mobile WiMAX and HSPA+, you can make the following conclusions:

-mobile WiMAX release 1.5) is comparable to HSPA+ (release 8) peak speed in a descending channel with the same modulation, coding rate and channel width. While mobile WiMAX in the ascending channel peak rate 2-3 times higher.

-System HSPA+ is limited by the channel width of 2x5 MHz in the traditional spectral conditions of 3G networks. Mobile WiMAX supports bandwidth up to 20 MHz as frequency and temporal dupliciranje. Its frequency profiles are planned in the range of 700, 1700, 2300, 2500 and 3500 MHz. Mobile WiMAX provides a "smooth IP network" (from end to end).

1.2 Comparison of the key technologies for WiMax and lte

The next step of evolution of 3GPP systems are system Long Term Evolution (LTE). They are distinguished by the OFDMA technology in a descending channel and SC-FDMA in uplink. Modulation - 64-QAM, channel width to 20 MHz, dupliciranje TDD and FDD. Applied adaptive antenna systems, flexible network access. Network architecture fully IP network. In the LTE system is applied technologies and methods already used in mobile WiMAX, so we should expect similar performance of LTE systems (table 1-2 and 1-3).

Table 3. The comparison of the parameters of real systems LTE WiMAX and molar (release 1.5) in the same frequency conditions at FDD with stripes h MHz

Settings	LTE			WiMAX Релиз 1.5
	Motorolla	T-Mobile	Qualcomm
Down channel
Antenna BS	2х2	2х4	4х2	2х2	4х4
Modulation and encoding rate	64 QAM 5/6	64 QAM 5/6	64 QAM 5/6	64 QAM 5/6
Speed Mbps	226	144	277	144,6	289
Ascending channel	Нет данных
Antenna AC		1х2	1х2	1х2
Modulation and encoding rate		64 QAM 5/6	64 QAM 5/6	64 QAM 5/6
Speed Mbps		50,4	75	69,1

The LTE system is a revolutionary improvement in 3G. LTE represents the transition from CDMA to OFDMA systems, as well as the transition to a fully IP system to the communication packets. Therefore, the introduction of this technology on existing cellular networks means you need a new radio resources to obtain benefits from broad channel. For backward compatibility required dual mode subscriber device. Therefore, a smooth transition from 3G to LTE is very complicated.

Table 4. Comparison of key parameters of LTE and WiMAX

Settings	LTE	WiMAX Релиз 1.5
1	2	3
Dupliciranje	FDD и TDD	FDD и TDD
The frequency range for analysis	2000 МГц	2500МГц
Channel width	До 20 МГц	До 20 МГц
From the base	OFDMA	OFDMA
Kbase	SC-FDMA	OFDMA
Spectral efficiency, bits/Hz/s
A downward channel, MIMO (2x2)	1,57	1,59
Ascending channel, SIMO (1x2)	0,64	0,99
The maximum speed of the mobile station km/h	350	120
Frame duration, MS	1	5
Antenna systems
Down channel	2х2, 2х4, 4х2, 4х4	2х2, 2х4, 4х2, 4х4
Down channel	1х2, 1х4, 2х2, 2х4	1х2, 1х4, 2х2, 2х4

Figure 1 - Comparison of the average spectral efficiency.

Note that the advantage in spectral efficiency means winning in the cost of network deployment (including unit costs relative to network bandwidth). In addition, increasing the channel capacity, allowing operators to introduce additional services. Mobile WiMAX is smooth IP network, the LTE network is more complex (figure 2).

Figure 2 - Comparison of system architectures WiMAX and LTE

If the WiMAX network is based entirely on IP protocols IEEE, the LTE network is more complex, involves more protocols, including proprietary protocols 3G. It is important that intellectual property in the field of WiMAX technology, the relevant patents are distributed among many companies, created open patent Alliance, which reduces the prices of subscriber devices.

Conclusions comparison of WiMAX and LTE:

- WiMAX, and LTE meet the objectives of IMT-Advanced;

specifications of IMT-Advancedеще not fully defined;

- IEEE802.16m will fully reflect the specifications and requirements of IMT-Advanced;

-mobile WiMAX release 1.5 and LTE share similar characteristics. In both on-line database is used OFDMAс multilevel modulation and coding. Peak speed is almost the same with the same multiplicities modulation speeds and correcting code. In both used and FDD, and TDD duplexsonography channel width to 20 MHz. In both uses MIMO large multiplicities and reduction of delays;

-mobile WiMAX has a two-year time to market and smooth e2e IP network architecture;

- throughput and spectral efficiency of mobile WiMAX release 2.0 has better options than LTE;

mobile WiMAX release 2.0 is compatible with releases 1.0 and 1.5;

- investments for network transformation from 2G/3Gв LTEи in mobile WiMAXпримерно same;

-and for LTE networks and WiMAX networks requires a new range;

-both networks need a multi-mode subscriber devices;