Speaker
Description
This paper presents a GNU Radio Modem design that demonstrates the feasibility of
achieving ≥10 Mbps Real-Time Binary Phase Shift Keying (BPSK) performance with a relatively low cost Personal Computer (PC) that contains an 8-core General Purpose
Processor (GPP). The high date rate is achieved with a single GNU Radio flowgraph and without a Field Programmable Gate Array (FPGA) or Graphics Processor Unit (GPU). The high data rate is achieved by breaking the incoming I/Q sample stream from a LimeSDR-mini into four “chunk” streams with each chunk stream going to a separate Symbol Synchronizer (symbol synchronization) and Costas Loop (carrier synchronization) chain with each chain using a separate GPP core. The
GNU Radio modem then “stitches” the original transmitted single stream back together by using the frame ASMs and the frame counter in the header of each frame. The approach is scalable, therefore much higher data rates
(>50 Mbps) may be achievable also with more GPP cores.
