The performance of Manchester source coding in an uplink LDPC channel coding OFDM-based massive MIMO system

Abstract

The fifth generation (5G) and future wireless networks meet the necessities of a world increasingly more dependent on mobile Internet and mobile phones. Thus, there are a series of technologies that make this possible, part of which are present in this paper. One such technology is where multiple antennas can be used for the receiver/transmitter terminals known as MIMO and evolved to Massive MIMO, where the number of antennas is much higher. Another one is represented by orthogonal frequency-division multiplexing (OFDM) used to mitigate or eliminate the inter-symbol and intra-symbol interferences. Low-density parity-check (LDPC) codes have relatively low and scalable decoding complexity. Therefore, in this paper is proposed a Massive multiuser MIMO system with Manchester source coding, LPDC channel coding and OFDM used by multiple users, when the number of antennas at the receiver varies between 8 and 12. Therefore, taking into account the afore-mentioned technologies and parameters, we analyze the quality of the information that reaches the base station (BS) using extensive Monte Carlo Matlab simulations in terms of bit error rate (BER) versus signal-to-noise ratio (SNR) for pseudorandom (PN) spreading codes, which spreads the OFDM modulated signal with or without Manchester encoding.