In this letter, an error-correction-based iris recognition (EC-IR) scheme, which utilizes multi-scale dominating feature points (msDFPs), is constructed to enhance the security level against a stricter concern of error-correction-based attack, where the intruder is assumed to be fully aware of the architecture of the adopted error-correcting code. The extraction method of the msDFPs is proposed to alter the essence of raw iris data. Accordingly, it is shown that the proposed msDFPs-based EC-IR scheme provides a balanced design which guarantees both a large value of security bits and an enhanced recognition performance, and is particularly suited for real-world applications where a high-level security is paramount.

In this paper, an error-correction-based iris recognition (EC-IR) scheme that guarantees both secure template storage and high-level recognition accuracy is first constructed for personal authentication. From the analysis of both the soft reliability values for the iris bits and the recovery capability values for the low-density parity-check (LDPC) code bits, a method called template mapping is devised in order to freely adjust the error-correction capability of the EC-IR scheme. The design process for suitable LDPC codes is then investigated so as to provide a stable and high-rate EC-IR scheme. In order to further enhance the security level of the EC-IR scheme, we propose locating the dominating feature points (DFPs), and then using them for iris recognition rather than using the original binary templates acquired from the iris database. The DFP-based EC-IR scheme not only enhances the security level, but also provides a better equal error rate (EER) performance and a faster processing speed during the verification stage. As a result, an iris cryptosystem based on the fuzzy commitment strategy is eventually constructed founded on a comprehensive consideration of both a satisfactory recognition performance combined with a high security level.

Spatial multiplexing aided spatial modulation (SMx-SM) is a communication technology which essentially combines the concepts of Vertical Bell Labs Layered SpaceTime (V-BLAST) and spatial modulation (SM). In this paper, we construct a high-rate spatial multiplexing aided generalized spatial modulation (SMx-GSM) scheme which guarantees a very low detection complexity. Benefiting from the codebook structure, a tree-search based MIMO detector for the SMx-GSM scheme can be devised. Simulation results show that the detection complexity can be significantly reduced, which makes a highrate system feasible, and an error performance which is very close to that of the maximum-likelihood (ML) detector can be achieved, especially for the case of a high-rate large-scale SMx- GSM system with a large number of activated transmit antennas.