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High Speed OFDM Packet Access (HSOPA)
Post: #1
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High Speed OFDM Packet Access (HSOPA) also called as super 3G can be said as the successor of HSDPA and HSUPA technologies specified in 3GPP releases 5 and 6. This expected fraction of 3GPP s Long Term Evolution (LTE) upgrade path for UMTS systems has given a totally different air interface system with that of the W-CDMA. The characteristics of HSOPA includes -: · Utilizes 1.25 MHz to 20 MHz bandwidth compared with the 5MHz usage of W-CDMA. · The upload and downlink transfer rates is 50 Mbps and 100Mbps and has a spectral efficiency of 2-4 times compared to 3GPP release 6. · When compared with W-CDMA. Has a better latency time of around 20ms for round trip time from user terminal to RAN which is same as of a combined HSDPA/HSUPA system The 3GPP LTE project by incorporating the HSOPA achieves the quadruple play services - voice, high-speed interactive applications including large data transfer and feature-rich IPTV with full mobility. Even though UMTS along with HSDPA and HSUPA gives high data transfer rates, wireless data usage, the competition from state-of-the-art technologies like the WiMAX has forced the UTMS to strengthen their network with the HSOPA that provides with increased data speeds, and spectral efficiency thus giving way for more functionality. Another advantage is with respect to the cost of upgradation to HSOPA. The cost will be very less for up gradation compared to setting up a new network.
Post: #2

High Speed OFDM Packet Access (HSOPA)


To improve the capacity of the UMTS third-generation cellular system for data services, a high speed downlinkpacket access (HSDPA) has been standardized. To support shared access on the downlink, WCDMA physical channels supporting high peak data rates have been introduced. However, the performance of conventional WCDMA RAKE receivers is limited over multipath channels. Therefore, advanced WCDMA receivers (e.g. MMSE equalizers) can be introduced to improve the performance of HSDPA. Alternatively, in the 3rd-Generation Partnership Project. the potential benefits of the introduction of OFDM in the UMTS downlink are studied. In this paper we evaluate the performances both of "textbook" OFDM and OFDM/OQAM in an HSDPA context, and compare it to that of WCDMA with RAKE and MMSE receivers. Other aspects related to the impact of the introduction of OFDM, such as system-level evaluation methodologies and receiver complexity, are also investigated.
Post: #3
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