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PDCCH search space candidates

- example
`ind = ltePDCCHSpace(enb,ue)`

`ind = ltePDCCHSpace(enb,ue,opts)`

returns
the (0,2,4,6)-by-2 matrix `ind`

= ltePDCCHSpace(`enb`

,`ue`

)`ind`

of search space
PDCCH candidate indices given the structures `enb`

and `ue`

.
Depending on input parameters, each search space contains (0,2,4,
or 6) PDCCH candidate locations defined by the rows of `ind`

.
Each two-element row contains the inclusive `[begin,end]`

indices
of a single PDCCH candidate location. By default, the one-based indices
define the PDCCH locations in the block of all multiplexed PDCCH data
bits to be transmitted in that subframe.

The control region of a downlink subframe comprises the multiplexing of all PDCCHs bits into a single block of data which is then processed and interleaved before PDCCH resource mapping. A UE has to blindly decode individual PDCCH directed at it. This task is simplified by subdividing the whole region into common and UE-specific search spaces which the UE should monitor. Each space comprises 2, 4, or 6 PDCCH candidates whose data length depends on its PDCCH format. Each PDCCH must be transmitted on 1, 2, 4, or 8 control channel elements (CCE) (1 CCE = 72 bits).

The returned search space is of the UE-specific type unless
the `RNTI`

field is missing from the structure `ue`

when
a common search space is returned. The search space always contains
2, 4, or 6 candidates; therefore, `ind`

has 2,
4, or 6 rows, unless the parameter combinations are not valid, in
which case the `ind`

output returned is empty.
For more information, see TS 36.213 [1], Section 9.1.1. The candidates in a space do not
need to be unique, especially for smaller bandwidths.

[1] 3GPP TS 36.213. "Physical layer procedures." *3rd
Generation Partnership Project; Technical Specification Group Radio
Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA)*.
URL: http://www.3gpp.org.

`ltePDCCH`

| `ltePDCCHDecode`

| `ltePDCCHDeinterleave`

| `ltePDCCHIndices`

| `ltePDCCHInfo`

| `ltePDCCHInterleave`

| `ltePDCCHPRBS`

| `ltePDCCHSearch`

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