Marvell International Limited

Hsiao Tang

Weishi Feng

Yungping Hsu

Guorong Hu

A circuit includes a multiplexer, a first measurement device, and a decision device. The multiplexer is configured to receive signals from antennas, where the signals include (i) a first signal received from a first antenna of the antennas, and (ii) a second signal received from a second antenna of the antennas. The first measurement device is configured to (i) determine a first peak-to-average ratio based on the first signal, and (ii) determine a second peak-to-average ratio based on the second signal. The decision device is configured to, based on the first peak-to-average ratio and the second peak-to-average ratio, signal the multiplexer to select one of the antennas.

Apparatus and method for selecting antennas based on peak-to-average ratios of received signals

A system includes a receiver, a processor and a decision device. The receiver receives a first signal via a first antenna, and one of the first signal and a second signal via a second antenna. The processor determines: based on the first signal as received at the first antenna, a first signal-to-noise ratio (SNR) and a first signal quality value; and based on the one of the first and second signals as received at the second antenna, a second SNR and a second signal quality value. The decision device selects one of the first and second antennas based on (i) a difference between the first SNR and the second SNR if the first SNR is greater than the second SNR, or (ii) the first signal quality value and the second signal quality value if the difference between the first SNR and the second SNR is less than a predetermined threshold.

System and method of selecting antennas based on signal-to-noise ratios and signal quality values

A receiver has a plurality of antennas for receiving a signal. The signal includes a data packet. The receiver includes a correlator to correlate a spreading code with a preamble of the data packet. A first processor determines a signal quality value of the signal at each of the plurality of antennas. The signal quality value at each of the plurality of antennas is determined during the correlation of the spreading code with the preamble of the data packet. A decision unit selects a first antenna of the plurality of antennas for reception of the signal based on the signal quality value determined at each of the plurality of antennas.

Antenna diversity technique for wireless communication

A receiver includes a demodulator that receives data packets each having a preamble and that generates spreading codewords by correlating a spreading code with the preambles of the data packets. A signal quality device determines signal quality values at a plurality of antennas for each of the data packets after correlation with corresponding ones of the spreading codes and selects one of the plurality of antennas based on the signal quality values. Each of the signal quality values includes a peak-to-average ratio value.

A communication system for communicating data packets includes a receiver subsystem. The receiver subsystem comprises a first antenna, and a second antenna. A direct sequence spread-spectrum demodulator communicates with the first and second antennas. The demodulator is configured to correlate a spreading code with a preamble of each data packet to produce a spreading codeword. The spreading code includes a predetermined number of chips. A signal quality measurement device is responsive to the direct sequence spread-spectrum demodulator. The device is configured to measure signal quality values corresponding to each of the first and second antennas for each data packet after correlation with the spreading code and to select one of said first and second antennas on the basis of the measured signal quality values.

A communication system comprises direct sequence spread-spectrum demodulator that receives first and second signals and that correlates a spreading code with a preamble of each data packet to produce a spreading codeword including a predetermined number of chips. A signal quality measurement device is responsive to the direct sequence spread-spectrum demodulator, measures signal quality values corresponding to each of the first and second signals for each data packet after correlation with the spreading code and that selects one of the first and second signals on the basis of the measured signal quality values.

A method and an apparatus for selecting an antenna from an antenna diversity array in a wireless communication system are provided. The method includes the steps of modulating an incoming signal with a spread-spectrum type modulation, measuring a signal quality value for each antenna in the antenna diversity array, and selecting an antenna from the antenna diversity array on the basis of the measured signal quality values. The step of measuring a signal quality value for each antenna may include computing peak-to-average ratio values by dividing a peak sample value by an average sample value, where the average sample value is determined by averaging all of the predetermined number of sample values for each of the plurality of incoming spreading codewords, and the peak sample value is determined by selecting the maximum of all of the predetermined number of sample values for each of the plurality of incoming spreading codewords.

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Hsiao Tang