Ultra wideband baseband chip with intelligent array radio and method of use thereof
View Patent ↗An ultra wideband receiver, based on multiband orthogonal frequency division multiplexing (MB-OFDM), combines digital data from multiple channels after signal processing and before decoding. The receiver provides a master controller that synthesizes packet synchronization, frame synchronization, and sampling frequency offset information from multiple channels into signals that simultaneously control all channels of the receiver.
1. A receiver, comprising:
a plurality of channels for receiving a signal, wherein each channel receives the signal independently, each channel having an analog-to-digital converter for an in phase (I) signal of the received signal and an analog-to-digital converter for a quadrature (Q) signal of the received signal;
each channel further having a signal processing block coupled to the I and Q analog-to-digital converters; and
a data combiner coupled to the signal processing blocks of each channel, that combines the I signals from each channel and combines the Q signals from each channel
wherein the signal processing blocks are further coupled to a controller, the controller comprising a combiner that combines incoming correlation values from the plurality of channels
wherein the controller further includes a master symbol sync, a master frame sync coupled to the master symbol sync, and a master sampling frequency offset feedback control coupled to the master frame sync;
wherein the master symbol sync process incoming symbol synchronization correlations values from the plurality of channels to produce symbol boundary and packet detection control information;
wherein the master frame sync determines a start of channel estimation symbols, header symbols and data symbols with a received packet;
wherein the master sampling frequency offset feedback control provides control information to a symbol sync of the signal processing block and a phase locked loop that drives a clock using sampling frequency offset estimates from each channel.
2. The receiver of claim 1 , wherein the values from the plurality of channels are selectable.
3. The receiver of claim 2 , wherein the selection is based on signal-to-noise ratio of the channels.
4. The receiver of claim 1 , wherein data combiner combines the signals using a weighted average based on the SNR of the signals.
5. The receiver of claim 1 , wherein the data combiner combines the signals using a simple average.
6. The receiver of claim 1 , wherein the data combiner combines values from enabled channels of the plurality of channels.
7. The receiver of claim 1 , wherein the plurality of channels includes three channels.
8. The receiver of claim 1 , further comprising a decoder coupled to the data combiner that reverses encoding functions of a transmitter.
9. The receiver of claim 1 , wherein the signal processing block shares a fast Fourier transform with a transmitter.
10. The receiver of claim 4 , wherein the data combiner is located after the signal processing blocks.
11. The receiver of claim 1 , wherein each signal processing block includes a channel equalizer.
12. A method, comprising:
receiving a signal;
for a plurality of channels, each of which receives the signal independently,
converting from analog to digital an in-phase (I) signal of the received
signal and a quadrature (Q) signal of the received signal;
signal processing each converted signal; and
after the processing, combining the I signals from each channel and combining the Q signals from each channel;
combining, by a combiner in a controller, incoming correlation values from the plurality of channels;
processing, by the controller, incoming symbol synchronization correlations values from the plurality of channels to produce symbol boundary and packet detection control information;
determining, by the controller, a start of channel estimation symbols, header symbols and data symbols with a received packet; and
providing, by the controller, control information for the signal processing and to a phase locked loop that drives a clock using sampling frequency offset estimates from each channel.
13. The method of claim 12 , wherein the values from the plurality of channels are selectable.
14. The method of claim 13 , wherein the selection is based on signal-to-noise ratio of the channels.
15. The method of claim 12 , wherein the combiner combines the signals using a simple average.
16. The method of claim 12 , wherein the plurality of channels includes three channels.
17. The method of claim 12 , further comprising reversing encoding functions of a transmitter.