TPCs are serially concatenated BCH codes with row/column interleaving between the inner and outer code. This structure coupled with iterative soft-decision decoding results in error-correction performance close to the Shannon limit. TPCs are particularly powerful at high code rates.

ECC was one of the pioneers in TPC technology.  Our TPC algorithms formed the backbone of AHA4540 the first commercially available TPC ASIC. We have used TPCs as the FEC layer of iPSTAR satellite communication system operational in south-east Asia and several other communication platforms. Our TPC selections include: