For a frame exchange, PNC requires two time slots, 802.11 requires four, while straightforward network coding requires three.
When receives, it extracts from using the local information, as follows: (2). Figure 3 Straightforward network coding scheme.
Therefore, PNC can improve the system throughput of the three-node wireless network by a factor of 100%and50%0% relative to traditional transmission scheduling and straightforward network coding, respectively.
It is shown that PNC can potentially achieve 100%and50%0% throughput increases compared with traditional transmission and straightforward network coding, respectively, in the 1D regular linear network.
Besides the precise definition of memoryless PNC which distinguishes it from the traditional straightforward network coding (SNC), [12] also gave a number of new PNC schemes.
For comparison purposes, let us look at the per-flow throughput under the traditional transmission strategy and under the straightforward network coding strategy.
The analytical results for the traditional transmission scheme and straightforward network coding scheme in our circular model are similar to those in the 1D linear network in [29] when goes to infinity.
Before introducing the PNC transmission scheme, we first describe the traditional transmission scheduling scheme and the "straightforward" network-coding scheme for mutual exchange of a frame in the three-node network [20, 25].
And in doing so, PNC can potentially achieve 100%and50%0% throughput increases compared with traditional transmission and straightforward network coding, respectively, in 1D regular linear networks with multiple random flows.
In contrast to "straightforward" network coding which performs coding arithmetic on digital bit streams after they have been received, PNC makes use of the additive nature of simultaneously arriving electromagnetic (EM) waves for equivalent coding operation.
