The New Wireless Wars
An anonymous reader writes "BusinessWeek has a story on the coming wireless wars. It's a look at how the upcoming government auction of wireless spectrum will open the door to a new crop of competitors. The new players, from Google and Microsoft to Intel and Craig McCaw's Clearwire, will compete in new wireless voice services and in wireless broadband. Look out Cingular, Verizon Wireless, and Sprint-Nextel."
Auction 66 Summary Page
Auction 66 Fact Sheet (Lots of details on this page if you scroll down).
NOTE: These are not virgin frequencies; some relocation of existing users' bandwith is required in order to free up these frequencies. See the Fact Sheet for details.
Oh, you can already do it, if you are willing to spend some time, efford, and/or money.
I bought a T-Mobile MDA yesterday (without a contract). I'm a cingular user.
A few minutes on xda-developers, and I had a utility to remove the SIM lock, and the CID (bootloader) lock. Flashed the cingular firmware on it, and I was good to go.
I also unlocked my cingular treos (one I got from ebay), and flashed them with a customized version of the generic GSM firmware. No annoying carrier customizations, and I had a rock-solid, unlocked phone.
T-Mobile and Cingular don't lock their SIMs, so you are free to use any compatible phone you can get. Their phones can almost all be unlocked, and if you don't take the $150 subsidy in exchange for the phone, they will give you the unlock code. T-Mobile will give you the code on a subsidized phone after 3 months; I had no problem getting Cingular to give me unlock codes the day after activation (that was a business acct, FWIW).
You want beligerant, try Verizon. I had terminated the contract (and paid the fee to cover the subsidy) with Sprint, and had a free CDMA phone, which supported E911 and all other required technology. I flashed it with the stock Verizon firmware. It had Verizon firmware, settings, the works. They still wouldn't take it. Verizon will not take phones they didn't sell.
Sprint had no problem activating a ex-verizon phone for me, however. Go figure.
The bits/hertz problem refers to the fact that you can only cram so many bits of information into a cycle of a waveform. For instance, in phase shift keying the phase of a signal is shifted and represents a certain number of bytes. As an example, in bi-PSK a carrier frequency is shifted between two possible phases (0 or 180 degrees). Therefore, since you have two possible states, you can transmit a maximum of one bit per cycle of the carrier (2^1).
If you shift the carrier by four states you can send two bits of data per cycle (2^2) and so on. The problem is that it gets increasingly difficult to detect and recover the correct data and it imposes a limit on the amount of data that can be transmitted at once. Currently the maximum for PSK is around 256-psk (I think..) or 8 bits per cycle.
Some methods to increase the amount of data able to be transmitted include increasing the bandwidth (makes the signal cycle faster therefore more states per given period of time) and using efficient modulation methods.
I dont know about the backhaul problem, sorry.