Implementation of MIMO OFDM Transmitter and Receiver Chain

EasyChair Preprint no. 7180

Abstract

OFDM, is a modulation technique that divides the available spectrum into sub-carriers. OFDM when compared with Frequency-Division Multiple Access (FDMA), it uses the spectrum effectively by channel spacing, in this case channels are spaced close together and makes the carriers perpendicular to each other which prevents the interference between a closely spaced carrier channels. OFDM is principally used for its robustness in channel fading in the wireless environment. In order to make the system flexible for the design pre-requisites, we use reconfigurable architecture. FPGA is considered as one of the most efficient reconfigurable and reusable architecture. Following OFDM technique, for achieving maximum data rate, we can use MIMO systems. Interference between user to user may be observed by every user in MIMO, because data of many users transmitting over a common channel. In order to reduce the inter-user-interference, a zero-force precoding technique can be used at the transmitting end. Here, the information is being coded and is transmitted over the channel (MIMO), then the information received at receiver has comparatively less Bit Error Rate (BER). The main aim of our project is to design and implement a base band (BB) OFDM transmitter and receiver on a FPGA hardware. This process includes QPSK mapping module, scrambler, encoder, inter-leaver and cyclic prefix insertion modules. The design uses a 64-point FFT or IFFT as one of its main module. In addition to OFDM, we are using a zero-force-pre-coding technique in MIMO OFDM system which will be simulated using Xilinx 14.5 software and verify by using MATLAB 7.1.

Keyphrases: BER, FFT OR IFFT, MIMO, OFDM, QPSK

@Booklet{EasyChair:7180,
  author = {S Deepak Kumar and K Aravinda and K Akilesh and P Chandra Mohan and C S Govind Raj and K Harshitha and G Sai Sandeep},
  title = {Implementation of MIMO OFDM Transmitter and Receiver Chain},
  howpublished = {EasyChair Preprint no. 7180},

  year = {EasyChair, 2021}}