Comparison between wimax and hsdpa


The future of cellular networks is based on the coexistence of multiple access network systems. This paper handles two data oriented access networks, the worldwide interoperability for microwave gain access to (WiMAX) and the excessive speed downlink packet gain access to (HSDPA). HSDPA and Mobile WiMAX are two unique high speed mobile technology with distinct backgrounds. WiMAX is founded on OFDM as HSDPA is founded on CDMA.


The objective of the paper is to provide a techno-economic comparison of two wireless broadband technologies, Portable WiMAX and HSDPA. The comparison is split into two parts. The earliest part is a general overview and assessment of both technology standards. The second part describes the several releases of WiMAX and HSDPA and the market opportunities.

What is WiMAX?

WiMAX is the different term for IEEE 802.16 STANDARD. It is predicated on the wireless Gentleman technology. It is just a communication technology that works with the air spectrum to transmit tens of MB/sec in bandwidth between numerous devices like

laptops. The two stimulating forces of present net are the cellular and the broadband. The WiMAX standard joins the two high speed broadband access to the internet over an individual wireless connection. As WiMAX can be utilised for long distance functions this can be a very effective approach to solve the last mile issue. WiMAX would operate equivalent to a Wi-Fi but at higher speeds, large distance and for more number of users. WiMAX gets the capability to provide services in areas which happen to be problematic for wired infrastructure to attain and has the ability to overcome the limitations of the original wired infrastructure. It will provide wireless broadband access to the buildings, either to existing wired systems or in the rural areas. It may also be connected to the WLAN hotspots to the web.

Some of the characteristics of Mobile WiMAX are:

  1. Scalability: Mobile WiMAX features been framed in such a way that it is in a position to work in different channel BW’s ranging from 1.25 to 20 MHz.
  2. High Data Rates: when Maximum Input Maximum Output (MIMO) 2*2 can be used and DL: UL can be in the ratio of just one 1:0 and 0:1 respectively, in a 10 MHz channel great data rates can theoretically assist peak download data rates up to 63Mb/s per sector and peak upload data rates up to 28 Mb/s per sector.
  3. Mobility: Seamless handoff which is significantly less than 50ms latency and < 1% packet loss is supported. Upto 120 km/hr of mobility has been examined for Mobile phone WiMAX.
  4. Quality of Support (QoS): QoS actions for WiMAX include option of service, throughput of data, jitter and the amount of error.


High speed Downlink packet access (HSDPA) can be a packet based data service characteristic of the WCDMA standard. In the WCDMA downlink, the data transmission is up to 8-10 Megabits/sec over a bandwidth of 5MHZ. It is sometimes known as a 3.5G technology. HSDPA is an progression of the WCDMA normal which is established to boost the data rate by a factor of 5 or even more. HSDPA boosts on W-CDMA by

using different techniques for modulation

and coding. It defines a new WCDMA called high-speed downlink shared channel (HS-DSCH). That channel writing an interesting should college athletes be paid essay performs contrastingly from additional channels and helps to fasten the downlink speeds. HS-DSCH can be used limited to the downlink interaction of the cell. That implies that data is

sent from the foundation to the telephone. It isn’t

possible to send data from the telephone to a

source using HSDPA. The channel is certainly shared

between all users which enables the radio

signals to be used most effectively for the

fastest downloads.


From the technical viewpoint the choice between tone of voice communications in VoIP/WiMAX or WCDMA/HSDPA is normally a subject of taste. But not in economic conditions – WCDMA traffic is much costlier than VoIP traffic. For transmitting multimedia data both technologies have almost the same capacities. Both WiMAX and HSDPA contain traffic prioritizing and Quality of Service.


The security service in a WiMAX is used by an operator to gain advantages from this service as there’s always a chance of theft of service in connections, bandwidth etc. Hence the security service is divided into two parts specifically the encryption and the authentication/essential derivation. WiMAX supports modern day cryptographic algorithms.

In HSDPA, Users happen to be authorized by their SIM (or R-UIM) cards. HSDPA does not provide any additional security functions. Typical of all CDMA standards, data encoding for various users works better than any cryptographic algorithm, but fails if an interrupter somehow gets its stations code (like special agents) or is normally in a base station. Whereas, in WiMAX the base station is strongly protected from management attacks and as the machine is organized strongly a certificate based reliability is easy to deploy and is normally advisable.


When HSDPA and WiMAX are in same range from a base station, the gain in HSDPA vs. WiMAX isn’t clear yet. One of the main reasons for this is WiMAX doesn’t have many regularity ranges. But if HSDPA, as an evolutional step in the development of WCDMA, is getting near to the threshold of spectral performance, while WiMAX has many likely means of progression such as for example new modulation schemes (aswell combined with old kinds),MIMO(multiple-input-multiple output)and different frequency ranges (ranging from 10GHz to 66GHz).


With the use of a robust modulation scheme at very long ranges with huge spectral efficiency WiMAX gives huge throughput and in addition bears multipath fading. WiMAX bottom station interchanges throughput for array and this is certainly allowed by the dynamic adaptive modulation. HSDPA supports 16 QAM and QPSK modulation whereas WiMAX supports QPSK, 16 QAM and 64 QAM. This implies that Portable WiMAX supports higher order modulation than HSDPA. With 64 QAM 6 bits could be carried per symbol and thus higher data rates may be accomplished.

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