Performance of pilot symbol-assisted coherent orthogonal filter based Rake receiver using fast transmit power control for DS-CDMA mobile radio

The bit error rate (BER) performance against average E-b/N-o (signal energy per bit-to-noise power spectral density ratio) and the capacity of the pilot symbol-assisted coherent orthogonal filter (PSA-COF) based Rake receiver with last transmit power control (TPC) are evaluated in DS-CDMA reverse link under multipath Rayleigh fading. Fast TPC, which controls all signals transmitted from users in the same cell or sector such that they are received with equal power at the cell site under fast Rayleigh fading, is essential for the PSA-COF based Rake receiver in the reverse link in order to improve the performance degradation experienced when the received signal level drops due to fading as the transmit power is limited in practical systems. Signal-to-interference plus noise power ratio (SINR) based fast transmit power control (TPC) is assumed here. By using the fast TPC in reverse link and applying the PSA-COF based Rake receiver to base station (BS), the transmit power of each mobile station (MS) can be significantly reduced, thus increasing link capacity. It is demonstrated that the capacity of the PSA-COF based Rake receiver is about 1.5 times higher than that of the conventional matched filter (MF) receiver in interference-limited channels.