Broadcom Corporation

Severine Catreux

Vinko Erceg

Pieter Van Rooyen

Jack Winters

Pieter Roux

Nelson Ray Sollenberger

Ian Riphagen

Oghenekome Oteri

Wei Luo

Hongwei Kong

Li Fung Chang

Mark Hahm

Xiaoxin Qiu

Rami Mehio

Sean Truong

Pieter c/o Broadcom Corporation Van Rooyen

Pieter W Roux

Disclosed are various embodiments involving a two-step searcher for cell discovery. Multiple scrambling codes associated with multiple neighboring cells are obtained. Slot timing is obtained for a received signal based at least in part on a detection of primary synchronization peak energy in the received signal. One of the scrambling codes for decoding the received signal is identified based at least in part on testing multiple scrambling code hypotheses in parallel during an accumulation time period of the received signal in response to obtaining the slot timing.

Two-step searcher for cell discovery

A method for communication includes performing by one or more processors and/or circuits in a communication device functions including determining transmit power weights, which are to be utilized for communicating one or more wireless signals via a wireless channel, as a function of frequency of a wireless signal communicated via the wireless channel. The determining may be based on a transmission mode of the wireless signal and a state of the wireless communication channel. Transmit antenna spatial weights may be determined for communicating the one or more wireless signals via a plurality of antennas. The one or more wireless signals may be weighted with the transmit power weights and/or one of the transmit antenna spatial weights. The weighted one or more wireless signals may be transmitted via one of a plurality of antennas in accordance with the transmission mode.

Frequency selective transmit signal weighting for multiple antenna communication systems

A receiver operatively coupled to an antenna structure capable of receiving a first plurality of RF signals is disclosed herein. The receiver includes an RF processing network operative to perform weighting and combining operations within the RF domain using the first plurality of RF signals so as to produce a second plurality of RF signals. Also provided is a downconverter configured to downconvert the second plurality of RF signals into a second plurality of down-converted signals. In alternate implementations certain of the weighting and combining operations are performed at baseband and the remainder effected within the RF domain. A transmitter of corresponding architecture is also disclosed.

Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining

Adaptive path selection for interference cancellation is provided for wireless communication devices. Signal strength metrics are obtained for each of multiple signal paths. One or more of the signal paths are selected as cancellation candidates in response to determining that the signal paths are associated with a strong interfering path based at least in part on the signal strength metrics for the signal paths and threshold criteria. Cancellation is enabled for an estimated signal generated using the signal paths in response to the signal paths being selected as cancellation candidates.

Adaptive path selection for interference cancellation

A method for processing communication signals is disclosed and may include, in a receiver and/or a baseband processor coupled to the receiver, the receiver comprising a plurality of antennas, generating a plurality of RF weighting values based on one or more output bit error rates of the receiver. A plurality of spatially-multiplexed RF signals, which are received by the receiver, may be weighted with the one or more of the generated plurality of RF weighting values, to form a plurality of weighted RF signals. Two or more of the generated plurality of weighted RF signals may be combined to form one or more combined RF signals. Each of the one or more combined RF signals may be processed by a different RF processing chain. The one or more output bit error rates of the receiver may be minimized by the generation of the plurality of RF weighting values.

Weight generation method for multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining based upon minimum bit error rate

A method for processing signals is disclosed and may include performing using one or more processor and/or circuits in a receiver that uses a plurality of antennas: receiving via a channel, a plurality of RF signals by one or more of the plurality of antennas. The plurality of received RF signals may be weighted utilizing one or more corresponding RF weighting values to generate a plurality of weighted RF signals. The one or more corresponding RF weighting values may include a frequency-independent weight coefficient that is constant over the channel. At least a portion of the plurality of weighted RF signals may be combined to generate one or more combined RF signals. The one or more corresponding RF weighing values may be selected to maximize an output signal-to-noise ratio of the channel. The output signal-to-noise ratio may be averaged over the channel.

Weight generation method for multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining

A system and method for generating weight values based on maximum data rate for weighting elements included within signal weighting and combining arrangements used in various multi-antenna transmitter and receiver structures is disclosed herein. Weighting values for a given signal combining arrangement are set so as to maximize an output data rate of the applicable multi-antenna system in the presence of adaptive bit loading of the subcarriers of a transmitted signal. The disclosed techniques may be employed to maximize a data rate of a multi-antenna communication system by using adaptive bit loading and RF and baseband weighting schemes. In this case a search is conducted over various combinations of RF and baseband weights in order to find the weight combination which, when adaptive bit loading is also employed, maximizes the data rate.

System and method for RF signal combining and adaptive bit loading for data rate maximization in multi-antenna communication systems

A method to process DP bits from multiple fingers within a WCDMA rake receiver is provided. DPCH pilot symbols are received, quantized and channel compensated. Then processing operations for individual fingers for the channel compensated quantized despread DPCH pilot symbols are chosen based on the DPCH slot format. The DPCH pilot symbols are processed based on the DPCH slot format in order to produce processed DPCH pilot symbols in a common format. These processed symbols may then be combined. Other embodiments may further allow for the computation of an SNR estimate based on the combined DPCH pilot symbols.

Method and apparatus to process dedicated pilot bits from multiple fingers

A method to adapt channel quality indicator (CQI) reports from user equipment (UE) is provided. This involves first determining the presence of a high-speed shared control channel (HS-SCCH) signal. An estimated signal to noise ratio (SNR) is also determined. Next an SNR correction based on the presence or lack thereof of the HS-SCCH signal and the CRC checks for HS-SCCH and HS-DSCH signals are determined and applied to the estimated SNR. The CQI report is then generated based on the corrected estimated SNR. This CQI report which takes into account a corrected estimated SNR may then be used to adjust the HS-SCCH signal in an HSDPA telephony system.

Wireless device operable to manipulate high-speed shared control channel (HSSCCH) quality control through channel quality indication report manipulation

A method to process DP bits and TPC bits from multiple fingers within a WCDMA rake receiver is provided. DPCH symbols are received, quantized and channel compensated. Then processing operations for individual fingers for the channel compensated quantized despread DPCH symbols containing DP bits and TPC bits are chosen based on the DPCH slot format. The DPCH symbols are processed based on the DPCH slot format in order to produce processed DPCH pilot symbols in a common format. DP bits and TPC bits may be processed in parallel by separate processing branches or in series by applying timing control to common processing modules. These processed symbols may then be combined. Other embodiments may further allow for the computation of an SNR estimate based on the combined DPCH symbols.

Method and apparatus to process dedicated physical control channel (DPCCH) in a transmit antenna diversity (TXDIV) rake finger

A system and method for generating transmit weighting values for signal weighting that may be used in various transmitter and receiver structures is disclosed herein. The weighting values are determined as a function of frequency based upon a state of a communication channel and the transmission mode of the signal. In variations, weighting of the weighted signal that is transmitted through each of a plurality of antennas is carried out with one of a corresponding plurality of transmit antenna spatial weights. In these variations, a search may be conducted over various combinations of transmit weighting values and transmit antenna spatial weights in order to find a weight combination that optimizes a performance measure such as the output signal-to -noise ratio, the output bit error rate or the output packet error rate.

A signal weighting and combining method implemented within a receiver having a plurality of receive antennas is disclosed herein. Each receive antenna is disposed to produce a received RF signal in response to a transmitted RF signal received through a channel. The method includes weighting the plurality of received RF signals produced by the antennas in accordance with a corresponding plurality of RF weighting values selected to maximize an output signal-to-noise ratio of the receiver averaged over the channel, thereby forming a plurality of weighted RF signals. The method further includes combining ones of the plurality of weighted RF signals in order to form one or more combined RF signals. A similar splitting and weighting method capable of being implemented within a transmitter having a plurality of transmit antennas is also disclosed.

A system and method for generating transmit weighting values for signal weighting that may be used in various transmitter and receiver structures is disclosed herein. The weighting values are determined as a function of frequency based upon a state of a communication channel and the transmission mode of the signal. In variations, weighting of the weighted signal that is transmitted through each of a plurality of antennas is carried out with one of a corresponding plurality of transmit antenna spatial weights. In these variations, a search may be conducted over various combinations of transmit weighting values and transmit antenna spatial weights in order to find a weight combination that optimizes a performance measure such as the output signal-to-noise ratio, the output bit error rate or the output packet error rate.

A signal weighting and combining method implemented within a receiver having a plurality of receive antennas is disclosed herein. Each receive antenna is disposed to produce a received RF signal in response to a transmitted RF signal received through a channel. The method includes weighting the plurality of received RF signals produced by the antennas in accordance with a corresponding plurality of RF weighting values selected to minimize an output bit error rate of the receiver, thereby forming a plurality of weighted RF signals. The method further includes combining ones of the plurality of weighted RF signals in order to form one or more combined RF signals. A similar splitting and weighting method capable of being implemented within a transmitter having a plurality of transmit antennas is also disclosed.

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Cardiff, CA, United States of America

Severine Catreux