Comparison Between Wimax And HSDPA

comparison Between Wimax And HSDPAABSTRACTThe future of wireless networks lies in the coexistence of multiple approach network technologies. This paper deals with two data oriented nettle networks, the widely distributed interoperability for microwave access (WiMAX) and the proud speed downlink packet access (HSDPA). HSDPA and brisk WiMAX be two antithetical steep speed mobile technologies with classifi competent backgrounds. WiMAX is ground on OFDM as HSDPA is based on CDMA.INTRODUCTIONThe fair game of this paper is to provide a techno-economic comparison of two wireless wideband technologies, Mobile WiMAX and HSDPA. The comparison is divided into two parts. The first part is a general overview and comparison of the two technology standards. The second part describes the different releases of WiMAX and HSDPA and the market opportunities.What is WiMAX?WiMAX is the new term for IEEE 802.16 STANDARD. It is based on the wireless humanity technology. It is a communication te chnology that works with the radio spectrum to transmit tens of MB/sec in bandwidth between different devices likelaptops. The two bear on forces of present internet ar the wireless and the broadband. The WiMAX standard joins the two high speed broadband internet access over a hit wireless connection. As WiMAX green goddess be utilise for long blank space purposes it is a very effective way to solve the last air mile problem. WiMAX would ope lay similar to a Wi-Fi but at higher speeds, vast distance and for more number of users. WiMAX has the capability to provide service in areas which are difficult for wired infrastructure to reach and has the ability to whelm the limitations of the traditional wired infrastructure. It will provide wireless broadband access to the buildings, either to existing wired networks or in the rural areas. It can also be connected to the WLAN hotspots to the internet.Some of the characteristics of Mobile WiMAX areScalability Mobile WiMAX has been framed in such a way that it is able to work in different channel BWs ranging from 1.25 to 20 MHz.High information Rates when Maximum Input Maximum Output (MIMO) 2*2 is used and DL UL is in the ratio of 10 and 01 respectively, in a 10 MHz channel high data rates can theoretic totallyy support peak download data rates up to 63Mb/s per sector and peak upload data rates up to 28 Mb/s per sector.Mobility broadloom handoff which is less than 50ms latency and Quality of Service (QoS) QoS measures for WiMAX include availability of service, throughput of data, jitter and the rate of error.WHAT IS HSDPA?High speed Downlink packet access (HSDPA) is a packet based data service feature 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 referred to as a 3.5G technology. HSDPA is an feeler of the WCDMA standard which is created to increase the data rate by a work out of 5 or more. HSDPA improves on W-CDMA by using different techniques for changeoverand coding. It defines a new WCDMA called high-speed downlink shared channel (HS-DSCH). That channel performs contrastingly from other channels and helps to fasten the downlink speeds. HS-DSCH is used only for the downlink communication of the mobile. That message that data issent from the source to the strait. It isntpossible to send data from the phone to asource using HSDPA. The channel is sharedbetween all users which lets the radiosignals to be used most effectively for thefastest downloads. multimedia systemFrom the technical point of view the choice between voice communication theory in VoIP/WiMAX or WCDMA/HSDPA is a matter of taste. But not in economic terms WCDMA trade is much costlier than VoIP traffic. For transmitting multimedia data both technologies have practically the same capacities. Both WiMAX and HSDPA have traffic prioritizing and Quality of Service.SecurityThe security service in a WiMAX is used by an operator to ga in benefits from this service as there is of all time a chance of theft of service in connections, bandwidth and so on. so the security service is divided into two parts namely the encoding and the authentication/key derivation. WiMAX supports modern cryptographic algorithms.In HSDPA, Users are authoritative by their SIM (or R-UIM) cards. HSDPA does not provide both additional security functions. regular(prenominal) of all CDMA standards, data encoding for various users works better than any cryptographic algorithm, but doesnt work if an interrupter somehow gets its channels code (like specific agents) or is in a base blank space. Whereas, in WiMAX the base station is potently protected from management attacks and as the system is organized strongly a certificate based security is easy to deploy and is advisable.BandwidthWhen HSDPA and WiMAX are at same distance from a base station, the gain in HSDPA vs. WiMAX is not clear yet. One of the main reasons for this is WiMAX doesn t have many absolute frequency ranges. But if HSDPA, being an evolutional step in the development of WCDMA, is getting cheeseparing to the thresh gray-haired of spectral efficiency, while WiMAX has many likely ways of cash advance such as new flection schemes (as well combined with the old ones),MIMO(multiple-input-multiple output)and new frequency ranges (ranging from 10GHz to 66GHz).ModulationWith the use of a robust modulation scheme at long ranges with high spectral efficiency WiMAX gives direful throughput and also bears multipath fading. WiMAX base station interchanges throughput for range and this is allowed by the dynamic adjustive modulation. HSDPA supports 16 QAM and QPSK modulation whereas WiMAX supports QPSK, 16 QAM and 64 QAM. This implies that Mobile WiMAX supports higher golf-club modulation than HSDPA. With 64 QAM 6 bits can be carried per symbol and then higher data rates can be achieved.