It operates in the 5 GHz band with a maximum net data rate of 54 Mbit / s, plus error correction code, which yields realistic net achievable throughput in the mid-20 Mbit / s.
32.
Key design elements of the traditional 512-byte sector architecture are maintained, specifically, the identification and synchronization marks at the beginning and the error correction coding ( ECC ) area at the end of the sector.
33.
The channel capacity, also known as the Shannon capacity, is a theoretical upper bound for the maximum net bitrate, exclusive of forward error correction coding, that is possible without bit errors for a certain physical analog node-to-node communication link.
34.
The notion of channel capacity has been central to the development of modern wireline and wireless communication systems, with the advent of novel error correction coding mechanisms that have resulted in achieving performance very close to the limits promised by channel capacity.
35.
The peak bit rate of the standard is the net bit rate provided by the physical layer in the fastest transmission mode ( using the fastest modulation scheme and error code ), excluding forward error correction coding and other physical layer overhead.
36.
As speeds and distances to such noise and signal distortion make recovery of the data a real challenge, the researchers used innovative detection techniques and applied a new set of technologies modulation, transmission and processing together with an advanced error correction coding.
37.
The cutoff rate used to be thought of as the limit on practical error correction codes without an unbounded increase in processing complexity, but has been rendered largely obsolete by the more recent discovery of turbo codes and low-density parity-check ( LDPC ) codes.
38.
There are other forward error correction codes that can be used in an HARQ scheme besides Turbo codes, e . g . extended irregular repeat-accumulate ( eIRA ) code and Efficiently-Encodable Rate-Compatible ( E2RC ) code, both of which are Low Density Parity Check Code.
39.
Such codes were used in the Pioneer program of the early 1970s to Jupiter and Saturn, but gave way to shorter, Viterbi-decoded codes, usually concatenated with large Reed-Solomon error correction codes that steepen the overall bit-error-rate curve and produce extremely low residual undetected error rates.
40.
The BER may be improved by choosing a strong signal strength ( unless this causes cross-talk and more bit errors ), by choosing a slow and robust modulation scheme or line coding scheme, and by applying channel coding schemes such as redundant forward error correction codes.
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