| The main focus of this thesis is to investigate the impact and compensation of the independent phase noises(PHN) caused by the free running oscillators in the single carrier uplink(UL) of a typical wireless communication system from a group of independent users. The random behavior of the PHN is studied and is modeled as a Weiner process. A phase factor for phase noise compensation for single input single output (SISO) channels is extended to the case of space division multiple access (SDMA) channels by adopting a parallel interference cancellation strategy. Starting with the relationship between the time varying phase noise and the signal expression at the transmitter output, a single carrier iterative block based frequency domain equalization with joint recursive second order phase lock loop algorithm (SCIBFDE-RSPLL) is proposed and evaluated. The IBFDE equalization receiver structure is created based on parallel interference cancellation (PIC) and minimum mean squared error (MMSE) criterion. For each received data stream, the user data is simultaneously detected and equalized. The signals from other users are subtracted before the equalization process. In each iteration, the proposed RSPLL phase tracking method is derived using the maximum a posteriori probability (MAP) criterion and the density function of decoded data is replaced by the posterior density function of estimated data from the previous iteration given the equalizer outputs. The phase tracking can be generalized as a second order PLL with two tracking parameters. Simulation results show that overall, the proposed SCIBFDE-RSPLL algorithm demonstrates a noticeable gain in the urban wide area fading (UWAF) channel and enjoys more diversity gain with SDMA channel configurations. |
