Mobile MIMO WiMAX System-on-Chip Design
The example of an OFDM receiver IC described in this chapter is a system-on-chip (SoC) that supports 2 × 2 MIMO WiMAX baseband and Media Access Control (MAC) layer functions. This SoC integrates an ARM-926, Flash, and synchronous dynamic random access memory (SDRAM) controller, Advanced Encryption Standard (AES) engine, and Universal Serial Bus (USB) 2.0. This chip delivers an average data transmission rate of 30 Mbps in low-mobility scenarios and up to 5 Mbps at 300 km/h.
11.1 Introduction of WiMAX Standard
The IEEE 802.16 standard for broadband wireless access, known as Worldwide Interoperability for Microwave Access (WiMAX), provides long-range, high-throughput transmission. Attractive features of WiMAX are its flexibility in terms of system deployment and service offerings . The main features of WiMAX are summarized as follows:
- Orthogonal Frequency-Division Multiple Access (OFDMA). WiMAX uses OFDMA as a multiple-access scheme so that different subsets of the OFDM subcarriers are allocated to different users at different times.
- IP-based architecture. Migrating from circuit switch to Internet Protocol (IP) packet switch, WiMAX adopts the All-IP structure mainly for two reasons. First, the deployment cost is low, as many existing infrastructures can be used. ...