FPGA implementation for channel estimations based on wiener LMS for DS-CDMA

Real-time DSP and FPGA Implementation of Wiener LMS Based Multipath Channel Estimation in 3G CDMA Systems

“…(15) for a given system/channel set-up in cdma2000 system. [24]. However, still the amount of the arithmetic operation will not be affected.…”

“…Based on dependence graph technique [11] different area-time efficient mappings were possible. Recently, a VLSI architectures targeted on FPGA are proposed in [24] for a multiuser channel estimation method using Wiener LMS (WLMS) [31]. However, many advanced techniques are computationally demanding and cannot be performed in real-time.…”

“…In this paper, we redesign a recently developed multiuser channel estimation technique [31] based on a multiuser WLMS algorithm and develop a much more efficient technique using fast Fourier transform. It has been depicted in [24] that up to a maximum of 19 users can be processed simultaneously with respect to WCDMA real-time constraints (e,g, 256 code length). Applying the FFT technique made it possible to afford 15 users using TMS320C6416 and up to 80 users using the Virtexi II Pro FPGA VP100 device.…”

“…[35,36]). They are computationally effective due to the even distribution of the computation load over each symbol duration, and no extra computation is required at the end of the processing window or preamble [24]. Like Kalman-based channel estimation methods, an autoregressive stochastic model of correlated Rayleigh fading processes is used but indirectly embedded into the design.…”

“…The attractive property of the proposed structure is the unique filter settings used for a large range of mobile speeds and for all users accessing the system. Unlike in our previous works [24], the contribution of our paper stems in transforming the technique in the frequency domain, taking advantage of the cost-effective fast Fourier technique, favorable for a low complexity implementation. Real-time DSP implementation is provided wherein real-time.…”