Abstract
The system architecture of the cellular base station modem engine (CBME) is described. The CBME is a single-chip multichannel transceiver capable of processing and demodulating signals from multiple users simultaneously. It is optimized to process different classes of code-division multiple-access (CDMA) signals. The paper will show that through key functional system partitioning, tightly coupled small digital signal processing cores, and time-sliced reuse architecture, CBME is able to achieve a high degree of algorithmic flexibility while maintaining efficiency. The paper will also highlight the implementation and verification aspects of the CBME chip design. In this paper, wideband CDMA is used as an example to demonstrate the architecture concept.
Highlights
Code-division multiple access (CDMA) is the physical layer access method used in third-generation (3G) mobile radio systems [1]. 3G systems have improved receiver performance over any of the current cellular systems due to the introduction of several new physical layer techniques such as coherent demodulation [2] and turbo codes [3], just to name a few
We focus on uplink reception and describe the system architecture of the cellular base station modem engine (CBME), a multichannel receiver that is capable of processing and demodulating signals from multiple users simultaneously
This paper presented the CBME processor design that can efficiently deal with 3G CDMA signal processing of various flavors
Summary
Code-division multiple access (CDMA) is the physical layer access method used in third-generation (3G) mobile radio systems [1]. 3G systems have improved receiver performance over any of the current cellular systems due to the introduction of several new physical layer techniques such as coherent demodulation [2] and turbo codes [3], just to name a few. 3G transceiver solutions must have a rapidly decreasing cost per channel as a function of time These features present a serious challenge in the efficient design and implementation of 3G transceiver solutions. The solution discussed in this paper occupies the energy efficiency and flexibility gap between dedicated hardware and CPU/FPGA. Base station receivers, that is, for uplink reception (many-to-one), have to processes signals from a large number of users simultaneously. We focus on uplink reception and describe the system architecture of the cellular base station modem engine (CBME), a multichannel receiver that is capable of processing and demodulating signals from multiple users simultaneously. The architecture presented is this paper addresses the challenges described by arriving at a scalable and flexible solution.
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