Abstract: Example methods use secondary scrambling codes in telecommunications networks. The secondary scrambling codes are assigned to mobile stations and channels used by mobile stations that are not adversely affected by the use of secondary scrambling codes. By assigning secondary scrambling codes additional users can utilize telecommunications networks with unique scrambling codes without reducing quality of service or increasing resource consumption. Example methods also reduce interference between mobile stations in the telecommunications networks.

Abstract: Spatial Division Multiple Access (SDMA) may be implemented in both the forward and reverse link directions through the use of, for example, a sector-wide primary pilot channel and one or more beamformed secondary pilot channels (secondary pilot channel).

Abstract: An adaptive quality control loop for link rate adaptation based on modulation and/or coding schemes (also referred to as “MCS levels”) and one or more spreading codes that adaptively selects channel condition thresholds in real-time without measuring all the factors that affect selecting optimal channel condition thresholds. The adaptive quality control loop involves adjusting the channel condition thresholds with variable up and down steps based on target quality metrics along with measurements such as error detection results, relative frequencies of visiting each MCS level, and transmitted data rates, wherein the target quality metrics can be a block error rate or bit error rate target criterion. If the target quality metric is a block error rate target criterion, the variable step is determined using a desired MCS error rate based on MCS probabilities, MCS error rates and the block error rate target criterion.

Abstract: A wireless communication system and joint beamforming method across multiple base stations for communicating with mobile stations. The wireless communication system communication system includes base stations and mobile stations. At least one of the base stations includes a joint beamformer controlling beamforming for the base stations. Each of the mobile stations receive information from the base stations, maintain a multiple-input and multiple-output active set (MAS) of base stations, and provide precoder weights to each of the base stations included in the MAS. The joint beamformer calculates joint beamforming weights for controlling communications between the base stations and mobile stations.

Abstract: A hybrid method of reverse link transmission provides improved performance, particularly in wireless packet data systems. The method includes aspects of both OFDMA transmission and MC-CDMA (Multi-carrier CDMA) transmission. In specific embodiments, an MC-CDMA pilot signal is used, and the data portion of the timeslot is partitioned between an MC-CDMA field and an OFDMA field.

Abstract: Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are mad e more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.

Abstract: Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are made more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.

Abstract: A closed loop power control based on receiving a continuous quality feedback is described. A main reverse link (RL) pilot is controlled by the quality feedback of a substantially continuous delay sensitive traffic stream, such as Voice-over-IP (VoIP), when such a stream is enabled. When such a stream is not enabled, the quality of a continuous RL overhead channel is used to control the pilot power. At the same time, the Traffic-to-Pilot Ratios (TPR) of contemporaneously transmitted delay sensitive data streams are independently adjusted based on a quality feedback associated with each such data stream.

Abstract: In the method of estimating a signal-to-interference+noise ratio (SINR), either the polarities or bit values of a plurality of received data symbol samples are estimated. Then an SINR estimate is generated based on the plurality of received data symbol samples and the estimated polarities or bit values of the plurality of received data symbol samples such that the SINR estimate is not substantially dependent on the polarities or a bit value of the plurality of received data symbol samples.

Abstract: In a UMTS (universal mobile telecommunications system) based system, a wireless receiver implements “effective signal-to-noise (Eb/No) based BER estimation.” In particular, the wireless receiver comprises a rake receiver, a processor and memory. The rake receiver processes a received signal and provides signal-to-noise ratio values for each slot of each received frame of the received signal. The processor converts these signal-to-noise ratio values for each received frame into an effective signal-to-noise ratio value for the received signal. The processor then uses the effective signal-to-noise ratio value as a pointer, or index, into a look-up table (stored in the memory) and retrieves a BER estimate therefrom.

Abstract: A wireless data communication system simultaneously transmits data signals from more than one antenna with a deterministic, time-dependent phase difference between the signals. In one example, more than one antenna transmits the same data signal with a phase difference between the transmitted signals. In another example multiple users' data signals are simultaneously transmitted using a corresponding plurality of beams that each use at least two transmitting antennas. Transmissions to multiple users on a shared packet data channel can be scheduled at the same time. In one example, the phase difference is periodic and the beams are orthogonal to maximize system throughput even when one or more users is stationary or slowly moving.

Abstract: Improvements are provided in an OFDM network that uses superposition coding. A broadcast signal and e.g. a unicast signal are each subjected to OFDM modulation including processing by an IDFT, combined, and transmitted using non-orthogonal transmission resources. In one approach, the respective signals are combined after instead of before the IDFT processing. In specific examples, a respective cyclic prefix is appended to each signal after the IDFT processing but before the respective signals are combined. In another approach, a broadcast pilot signal and e.g. a unicast pilot signal are transmitted concurrently with the broadcast and unicast information signals. The pilot signals are transmitted using the same time and subcarrier resources, but are made more distinguishable by combining each with a respective scrambling or spreading code. In specific examples, embodiments, the unicast pilot signal is used for estimating the data rate for transmission of further unicast information signals.

Abstract: Disclosed is an Orthogonal Frequency Division Multiple Access (OFDMA) based wireless communications system operable to communicate OFDMA type signals over a set of dynamically assigned orthogonal sub-carriers and Code Division Multiple Access (CDMA) type signals over a set of pre-allocated orthogonal sub-carriers. The OFDMA system utilizes pre-allocated orthogonal sub-carriers for CDMA type signal transmission in order to reduce the number of dynamic assignments of orthogonal sub-carriers in a typical OFDMA system. The OFDMA type signals may be signals processed in accordance with well-known OFDMA techniques, whereas the CDMA type signals may be signals processed in accordance with well-known CDMA and OFDMA techniques. The CDMA type signals may also be processed using a pre-coder incorporating a Discrete Fourier Transformer (DFT) matrix or Identity matrix to reduce the Peak-to-Average Power Ratio across the OFDMA system.

Abstract: A closed loop power control based on receiving a continuous quality feedback is described. A main reverse link (RL) pilot is controlled by the quality feedback of a substantially continuous delay sensitive traffic stream, such as Voice-over-IP (VoIP), when such a stream is enabled. When such a stream is not enabled, the quality of a continuous RL overhead channel is used to control the pilot power. At the same time, the Traffic-to-Pilot Ratios (TPR) of contemporaneously transmitted delay sensitive data streams are independently adjusted based on a quality feedback associated with each such data stream.

Abstract: A transport channel multiplexing system provides improved use of wireless resources in a shared data channel system. For example, the transport channel system reduces the amount of transport format information required for using a shared data channel, such as the actual number of packet data units in a transport channel of the shared data channel. Additionally, by scheduling or multiplexing coded sub-blocks from one or more transport channels over the shared data channel, the transport channel multiplexing system can provide improved integration with other important features, such as incremental redundancy, fast adaptation to channel conditions and transport channel dependent quality of service (QOS) control, to provide improved system performance.

Abstract: An adaptive quality control loop for link rate adaptation that adaptively selects optimal channel condition thresholds in real-time without measuring all the factors that affect selecting channel condition thresholds. The adaptive quality control loop involves adjusting the channel condition thresholds with variable up and down steps based on target quality metrics along with measurements such as error detection results, relative frequencies of visiting each modulation and/or coding schemes (also referred to as “MCS levels”) and transmitted data rates. In one embodiment, the adaptive quality control loop comprises the step of adjusting a channel condition threshold based on a error detection result for a data packet transmission using a variable step. The channel condition threshold is associated with an MCS level used in the data packet transmission.

Abstract: A novel topology sensing methodology is provided for point-to-point link setup among a set of network nodes, which are mobile. The technique provided is TDMA contention-based, where each network node sends pilot signals to announce its existence. Pilot signals transmitted by network nodes are used by surrounding nodes to extract various pieces of information such as node identity, node location and potential link quality. Information collected from pilot signals of neighboring nodes is used in conjunction with other topological criteria to identify the best set of nodes with which a given node should establish links. The topology sensing methodology avoids duplexer problems and attempts to achieve minimum collision by allowing the nodes to continually monitor available pilots and transmit on the least-interference channels.

Abstract: A hybrid method of reverse link transmission provides improved performance, particularly in wireless packet data systems. The method includes aspects of both OFDMA transmission and MC-CDMA (Multi-carrier CDMA) transmission. In specific embodiments, an MC-CDMA pilot signal is used, and the data portion of the timeslot is partitioned between an MC-CDMA field and an OFDMA field.

Abstract: Spatial Division Multiple Access (SDMA) may be implemented in both the forward and reverse link directions through the use of, for example, a sector-wide primary pilot channel and one or more beamformed secondary pilot channels (secondary pilot channel).

Abstract: A hybrid approach is provided to the formatting of signals for transmission in a high-data-rate wireless system. We retain the format and timing of an HRPD frame, but the data portions of selected slots within the frame are given over to OFDMA transmission instead of CDMA transmission. Because OFDMA is robust against self-interference, high throughput can be achieved in a greater number of slots, including at least some in which a low signal-to-interference-noise ratio (SINR) might limit a pure CDMA data rate.