Skip to main content

Comparison of wireless Access Technologies (WCDMA, HSPA, HSPA+, LTE)

WCDMA, HSPA, HSPA+, LTE



         "An information system formed by HAP (High Altitude Platform) will be a new generation-system for the wireless communications and HAPS (HAP Station) communication system combines the advantages of both terrestrial and satellite communication systems and avoids, to different extents, their disadvantages. Third generation (3G) mobile technology which is specified by the third generation partnership project (3 GPP) is definitely one of the candidates. With the success of wireless network, the IEEE 802.16 standard, with its wireless metropolitan area network (MAN) air interface appears to be a strong competitor. We provide initial practical comparison of these two technologies for HAPS Communication".



WCDMA
HSPA
HSPA+
LTE
Maximum Uplink Speed
128 Kbps
5.7 Kbps
11 Mbps
50 Mbps
Maximum Downlink Speed
14 Mbps
11 Mbps
28 Mbps
100 Mbps
Spectrum FDD
5 MHz
5 MHz
5 MHz
10 MHz
Latency Round trip
150 ms
100 ms
50 ms
10 ms
Access Method
CDMA
CDMA
CDMA
CDMA/SC FDMA











Table:  Comparison of wireless Access Technologies




Comparison of wireless Access Technologies (WCDMA, HSPA, HSPA+, LTE)
Comparison of wireless Access Technologies (WCDMA, HSPA, HSPA+, LTE)

Popular posts from this blog

Multiplexing and Multiple Access

Multiplexing And Multiple Access : Digital Communications Difference between Multiplexing and Multiple Access: Sr.No. Multiplexing Multiple Access 1 “In telecommunications and  computer networks, multiplexing is a process where multiple analog  message signals or digital data  streams are combined into one   signal over a shared medium.” “In telecommunications and computer networks, a channel access method or multiple access  method allows several terminals connected to the same multipoint physical medium to transmit over it and to share its capacity.” 2 The multiplexed signal is transmitted  over a communication channel,  which may be a physical transmission medium. A channel-access scheme is  based on a multiplex method  that allows several data streams  or signals to share the  same communication channel or  physical media.

Difference in between Time division multiplexing (TDM) and Frequency division multiplexing (FDM)

Difference in between TDM and FDM: This page on FDM versus TDM describes  difference between FDM and TDM multiplexing . FDM is the short form of frequency division multiplexing and TDM is the short form of time division multiplexing. In FDM each signal is modulated onto different unique RF carrier frequency and all carrier frequencies are separated significantly so that bandwidth of the signals do not overlap in frequency domain. Figure: Difference in between TDM and FDM

Comparison between armature controlled and field controlled DC servo motor

Comparison between armature controlled and field controlled DC servo motor : Field controlled DC servomotor Armature controlled DC servomotor 1.                         Field is excited by control voltage Armature is excited by control voltage 2.                        Armature            current kept constant Field      current kept constant 3.                        Required             low        power amplifiers are simple to design Required             high       power amplifiers 4.                        Efficiency is poor Efficiency is better 5.                        It has large time constant It             has         small      time constant 6.                        Cost is low Cost is high 7.                        It is open loop system It is close loop system Comparison between ar