09/24/2010
PC Magazine
Rumors have cropped up again Friday about manufacturers preparing a CDMA version of Apple’s iPhone 4, which a range of lazy journalists are using to speculate that the iPhone is coming to Verizon Wireless sometime soon.
But even if Apple is building a CDMA iPhone using Qualcomm’s chips, that doesn’t make it a Verizon iPhone. [...]
09/24/2010
DigiTimes
Pegatron Technology is expected to begin volume production of a CDMA-version iPhone 4 in November with total shipments likely to reach 3-4 million units in the first three months, and 10 million by mid-2011, according to industry sources.
With shipments of iPhone 4, and orders from Asustek Computer, Acer, Toshiba and Sony as well as tablet [...]
YES!
Compressed mode allows a UE to perform interfrequency measurements.
One importance between CDMA and TDMA is that
In CDMA, the UE transmits and receives continously during all the frames and slots.
In TDMA the UE is only active during one slot in a frame.
Then, during the rest of the slots, the receiver can be tuned to other frequencies [...]
1. Binary XOR operation allows the original symbol reconstruction.
Do spread:
symbol sequence X (XOR) some code Y => some signal Z
Do despread:
some signal Z (XOR) some code Y => symbol sequence X
—————
2. Let’s assume there are 10 users who want to send its data X1, X2, …, X10.
Let’s assume they have their own codes Y1, Y2, [...]
First, think about the definition of spreading factor (SF): the number of chips for each symbol.
Second, remember that a chip duration is fixed.
Third, what is symbol? Each symbol can represent some amount of bits. e.g., QPSK, each symbol represents 2 bits.
SF: 2 SF vs. 512 SF
Time: 2*delta vs. 512*delta
Data: 1 symbol vs. 1 symbol
where delta [...]
