I'm also an RF engineer. But I'm suprised to see some of the wrong and arguable points that you raised. Do your reading first before giving misleading info to public.

FDD has basically same bandwidth for both downlink and uplink. If you allocate 10MHz for downlink, you'll have 10MHz for uplink as well. Unless you are doing carrier aggregation (LTE-Advanced), or DC in 3G, you'll then have asymmetric carriers.

In LTE, 1 subcarrier is 200kHz, not 100kHz. In LTE, users are allocated with Resource Block, which consists of a number of Resource Elements.

When you're comparing TDD and FDD, are you saying that idle TD-LTE users do not consume resource while idle FDD LTE users do? You should then go read the 3GPP specs on LTE first before talking about resource allocation

You forgot to mention that TDD has a challenging interference issue between downlink and uplink, hence that's why almost all operators in the world are doing FDD

You're right in terms of lower frequency = less data, and lower frequency = better coverage. But the data is modulated.. LTE is using OFDM on the downlink and SC-FDMA on the uplink, so no matter which frequency you use, the spectral efficiency (bits/Hz) is the same. Also why do you say 1800MHz will be more congested? This will depend on the operator, how they manage their traffic. If operator does both LTE1800 & LTE2600, they can actually prioritise LTE2600, such that users will go to this layer first (assuming the device also supports both bands)

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Added on December 16, 2012, 8:15 pm

It has been approved.. I think you will see it early next year, maybe...