  The sixth generation (6G) wireless communication system will improve the key
technical indicators by one to two orders of magnitude, and come with some new
features. As a crucial technique to enhance the reliability and efficiency of
data transmission, the next generation channel coding is not only required to
satisfy the stringent requirements of 6G, but also expected to be backward
compatible to avoid imposing additional burden on the crowded baseband chip.
This article provides an overview of the potential channel codes for 6G
communications. In addition, we explore to develop next-generation channel
codes based on low-density parity-check (LDPC) and polar frameworks,
introducing a novel concept called generalized LDPC with polar-like component
(GLDPC-PC) codes. The codes have exhibited promising error correction
performance and manageable complexity, which can be further optimized by
specific code design. The opportunities and challenges of GLDPC-PC codes are
also discussed, considering the practical applications to 6G communication
systems.
