Reference design for enterprise and public access TD-SCDMA small cells

May 09, 2012 // By Jean-Pierre Joosting
Mindspeed Technologies claims the industry's first product for enterprise and public access Time Division Synchronous Code Division Multiple Access (TD-SCDMA) small cells. Combining the company's Comcerto® C1000 CPE processor and PC205 baseband with the PC8818 software, the 16-user reference design will provide small cell coverage to the world's largest mobile market.

Mindspeed is currently the only system-on-chip (SoC) company to offer TD-SCDMA small cell solutions and now has a total of seven customers in China.

"Everyone is in agreement over the need for small cells, particularly to deliver capacity in enterprise and urban environments, and this is no different for TD-SCDMA," said Yingbo Jiang, vice president and general manager of China's wireless business unit, at Mindspeed. "We are the first and only company to support this massive market with an SoC solution, and have seven customers using our TD-SCDMA solution. Beyond 3G, we are the only company to have demonstrated both Frequency-Division Duplexing (LTE FDD) and Time-Division Duplex Long-Term Evolution (TD-LTE) for small cells, and we are working on dual-mode combining TD-LTE and TD-SCDMA."

Following Mindspeed's acquisition of Picochip, the reference design demonstrates the synergies of the two companies' products. It combines the best of each company's silicon expertise, with the PC205 baseband processor and the C1000 CPE processor working together on the PC8818 software stack for 16-user systems.

The PC8818 software stack is fully compatible with China Mobile's TD-SCDMA enterprise femtocell specification, following Mindspeed's role as one of the key contributors. The higher performing PC205 is also pin-to-pin compatible with the PC202, enabling customers to reuse their residential femtocell hardware design. Finally, while the PC8818 improves some key algorithms in the receiver to support 16 simultaneous users, it still maintains the same API to the high-layer protocol stack allowing customers to integrate their existing femtocell software stack. Combined, these measures significantly reduce risk for customers, accelerating time to market.