Approach the capacity of multiple access channels using interleaved low-rate codes

Abstract—We show that the capacity of a Gaussian multiple access channel can be approached by interleaved low-rate codes together with a simple chip-by-chip iterative decoding strategy. Based on a rate 1/69 code and with a total of 35 simultaneous users (the aggregate rate 1/2), performance ofBER = 10 5 is observed at 0 1 4 dB, which is close to the corresponding capacity limit ( 0 0 dB). Index Terms—Channel capacity, multiple access channels. I