Realizing this, among the many announcements made at Mobile World Congress this week by big semiconductor firms such as Texas Instruments, Qualcomm (its QST 1100 offers Wi-Fi connectivity and more!) and Broadcom, two startups ??? Redpine Signals from San Jose, Calif., and Nanoradio in Kista, Sweden ??? came out with Wi-Fi radios they claim are power efficient.