Area-Efficient On-the-Fly Code Generator for BDS B1C Receivers

Area-Efficient Universal Code Generator for GPS L1C and BDS B1C Signals

“…Lastly, Legendre sequence-based codes show excellent correlation characteristics, and they have recently been used in GPS L1C and BDS B1C signals. As the fields of the application of the GNSS have expanded along with the recent development of the industries, studies to provide high precision and additional functions of GNSS receivers have been extensively conducted [8][9][10][11][12][13][14][15][16][17]. In addition to the simple role of receiving signals and performing navigation calculations, advanced signal technologies, such as anti-jamming [8] and anti-spoofing [9], are applied, and studies on multiconstellation and multi-frequency receivers [10][11][12] are being conducted for high-precision high-reliability location calculations.…”

“…In addition to the simple role of receiving signals and performing navigation calculations, advanced signal technologies, such as anti-jamming [8] and anti-spoofing [9], are applied, and studies on multiconstellation and multi-frequency receivers [10][11][12] are being conducted for high-precision high-reliability location calculations. Especially, studies on single code generators that support various codes are actively conducted for the implementation of multi-constellation and multi-frequency receivers so that single receivers can support multiple codes [13][14][15][16][17]. As shown in Table 1, since LFSR-based code generation is the most widely applied, studies on LFSR-based codes have been steadily conducted [10][11][12][13].…”

“…As representative Legendre-based generator structures, authors of [14,15] proposed general code generators that use memory to store and read Legendre-based codes. The authors of [16] proposed a code generator structure where Legendre sequences are generated on the fly to generate PRN codes and to the authors of [17] proposed a Weil-generation code generator structure where Legendre sequences are stored in the ROM and Weil sequences are generated on the fly. Although previous studies [14][15][16][17] succeeded in generating multiple Legendre-based codes using single hardware, they still use a lot of unnecessary hardware resources to universally generate Legendre-based codes.…”

“…The authors of [16] proposed a code generator structure where Legendre sequences are generated on the fly to generate PRN codes and to the authors of [17] proposed a Weil-generation code generator structure where Legendre sequences are stored in the ROM and Weil sequences are generated on the fly. Although previous studies [14][15][16][17] succeeded in generating multiple Legendre-based codes using single hardware, they still use a lot of unnecessary hardware resources to universally generate Legendre-based codes. Therefore, this paper proposes an area-efficient code generator structure where many Legendre sequence-based codes can be generated using a single universal code generator by removing redundant used hardware resources within a range where the overall system performance is not degraded.…”

“…In order to implement the GNSS receiver in hardware, the implementation of a code generator is essential. Whereas existing studies on code generators were conducted focusing on LFSR-based codes [10][11][12][13], a few studies on Legendre sequencebased codes have recently been conducted [14][15][16][17]. Figures 2-4 show the structure of Legendre sequence-based code generators.…”