Abstract
We propose a novel scheme of subband adaptive array (SBAA) for direct-sequence code divisionmultiple access (DS-CDMA). The scheme exploits the spreading code and pilot signal as the reference signal to estimate the propagation channel. Moreover, instead of combining the array outputs at each output tap using a synthesis filter and then despreading them, we despread directly the array outputs at each output tap by the desired user's code to save the synthesis filter. Although its configuration is far different from that of 2D RAKEs, the proposed scheme exhibits relatively equivalent performance of 2D RAKEs while having less computation load due to utilising adaptive signal processing in subbands. Simulation programs are carried out to explore the performance of the scheme and compare its performance with that of the standard 2D RAKE.
Highlights
Digital mobile communications are affected by multipath fading and interference causing reduced channel capacity and impaired signal quality
We propose a novel scheme of adaptive array for direct-sequence code division multiple access (CDMA) (DS-CDMA) using subband signal processing to make use of CDMA and subband adaptive array (SBAA) advantages
We have presented a novel configuration of subband adaptive array for direct-sequence code division multiple access (DS-CDMA) mobile radio which is called the implicit 2D RAKE
Summary
Digital mobile communications are affected by multipath fading and interference causing reduced channel capacity and impaired signal quality. A typical configuration of 2D RAKE receivers often contains a beamforming structure followed by a conventional one-dimensional (1D) RAKE as presented in [6, 7] By using these 2D RAKEs, the system performance has been shown to be greatly improved compared with that of 1D RAKE receiver alone or CDMA with adaptive array antenna without implementing RAKE combination. EURASIP Journal on Applied Signal Processing its configuration is far different from that of the 2D RAKE receivers, the proposed scheme exhibits relatively equivalent performance while having less computation load due to utilising adaptive signal processing in subbands. For this reason, we call the scheme an implicit 2D RAKE receiver.
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