These comments have been added
to stress operating conditions the UE should encounter in order to observe the expected performance
improvement.
Similarly, HSUPA Release 6 and below assume utilizing BPSK uplink modulation scheme.
The HOM solutions would also work in this case, for example, 16-QAM is used. A key outcome
here is that the uplink PAPR would increase and thus force the UE to use more linear PAs or
apply various power backoff strategies. This would also seem to point to usage cases with high
geometries as a starting point. Note, generally speaking, using HOM tends to force tighter linearity
requirements (i.e., smaller EVM targets) in both the transmit and receive end of the communication
link. We should mention that uplink transmission of HOM also requires the NodeB
receivers to move to more advanced receiver architectures to fully take advantage of the proposed
benefits.
Continuing along the lines of increased data rates as well as increased capacity and increased
coverage, we can mention the use of enhanced receivers. And under this umbrella we will include
MIMO, receive diversity, and interference cancellation technologies. As far as MIMO is concerned,
we will discuss this technique in more detail in a later section but suffice it to say that initial applications
consider two transmit and two receive antenna scenarios.
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