Abstract: A system and method for receiving radio frequency signals, comprising a plurality of analog signal couplers, for communicating a representation of a radio frequency signal; a respective analog to digital converter for each of said couplers, each having an output presenting a digital representation of the representation and an associated clock; a non-blocking switch matrix, receiving the plurality of outputs and associated clocks, and producing a plurality of regenerated outputs and associated regenerated clocks under selective control of a switch matrix signal; and a plurality of digital radio frequency signal processors, adapted to receive at least one regenerated output from the non-blocking switch matrix and associated regenerated clock.

Abstract: Provided is a method of selecting an algorithm in a wireless receiver which supports a plurality of algorithms, more particularly, a method of selecting a suitable algorithm which is adaptive to changes in channel environment and satisfies requirements of applications, using information which is available in the wireless receiver. The algorithm selection method includes: calculating a measure value for selecting an algorithm on the basis of information obtained from the wireless receiver; comparing the measure value with at least one threshold value, and selecting an algorithm that is to be applied to a received packet, from among the plurality of algorithms, according to the result of the comparison; and decoding the received packet using the selected algorithm, wherein the at least one threshold value is adaptively updated on the basis of the information obtained from the wireless receiver.

Abstract: System for dual diversity receiver using switched LNAs. A dual diversity receiver is provided that includes two antennas to receive a radio signal, where each antenna produces an antenna signal that is representative of the received radio signal. The receiver includes first and second LNAs that receive the respective antenna signals and output first and second amplified signals. The receiver also includes logic to determine the stronger antenna signal and select one of the LNA outputs for processing by the receiver.

Abstract: A method is provided for generating a beamformed multiple-input-multiple-output (MIMO) channel. The method comprises receiving by a first wireless station a first plurality of signals transmitted from a first antenna on a second wireless station, deriving by the first wireless station a second plurality of signals corresponding to a second antenna on the second wireless station from the first plurality of signals, computing first and second beamforming weighting vectors from the first and second plurality of signals, creating a beamformed MIMO channel between the first and second wireless stations using the first and second beamforming weighting vectors, and allocating a predetermined transmitting power to signals beamformed by the first and second beamforming weighting vectors.

Abstract: A wireless receiver (100) is provided, comprising: a non-coherent signal detector (130) configured to receive an incoming signal and perform a non-coherent signal analysis in response to a first control signal; a coherent signal detector (140) configured to receive the incoming signal and perform a coherent signal analysis to extract coherently-encoded data from the incoming signal in response to a second control signal; and a receiver circuit (160) configured to process the coherently-encoded data. The non-coherently-encoded data provides an indication as to whether the incoming signal includes the coherently-encoded data, and the coherent signal detector is further configured to enter in a low power sleep state in response to a third control signal.

Abstract: The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The local oscillation module generates a first and a second local oscillation. The transmitter section converts an outbound baseband signal and/or a low intermediate frequency (IF) signal into a first outbound radio frequency (RF) signal based on the second local oscillation when the wide bandwidth transceiver is in a second wireless standard mode and converts the outbound baseband and/or the low IF signal into a second outbound RF signal based on the first and second local oscillations when the wide bandwidth transceiver is in a first wireless standard mode.

Abstract: A number of RF receivers are connected in a network. The network is used to transmit communications, data, or both to and from the RF receivers and to synchronize the RF receivers to a common time. Digitized RF data is time-stamped and stored in memory. A trigger circuit in one or more RF receivers determines whether a trigger criterion or criteria has been met. When a trigger criterion or criteria has been met, some or all of the RF receivers in the network transmit select digitized RF data to a central processing device. The central processing device processes the select digitized data to detect if a signal is present.

Abstract: Provided is a low-complexity transmit/receive antenna selection method for Multi-Input Multi-Output (MIMO) systems. The method includes the steps of generating a gain matrix of receive channel, calculating norm values of channel gains for each row (receive antennas) and column (transmit antennas) of the generated gain matrix of the receive channel, selecting an antenna with the maximum norm value among the calculated norm values of channel gains, and repeatedly performing the process of alternately selecting transmit and receive antennas having the maximum channel gain value among the channel gain values of the selected antenna until a required number of antennas is all selected.

Abstract: Receiver diversity in a wireless device is controlled in response to operating conditions, transmission requirements, and control settings. The control of diversity reduces power consumption by enabling receive diversity on given conditions. Operating conditions, transmission requirements, and control settings are used separately or used in conjunction to determine whether benefits of multi-antenna receive diversity, such as higher link capacity, higher data throughput, lower transmit power, and lower error rate, warrant the higher power cost of the diversity.

Abstract: A system and method for processing signals are disclosed. The method may include scrambling a first composite signal comprising N orthogonal sequences to generate a set of N channel signals. A second composite signal including M orthogonal sequences may be scrambled to generate a set of M channel signals. The M orthogonal sequences may be a subset of the N orthogonal sequences. The generated set of N channel signals and the generated set of M channel signals may be combined to generate K channel signals. K multiplexed channels may include the N channel signals and the M channel signals. The N channel signals may correspond to N antenna elements, and the M channel signals may correspond to M antenna elements. Each of the N channel signals may be spread utilizing a corresponding one of the N orthogonal sequences.

Abstract: Provided are a tuner and a broadcast receiver having the same. The tuner comprises a first signal receiver, a second signal receiver, a signal converter, and a signal processor. The first signal receiver receives a first signal. The second signal receiver receives a second signal. The signal converter converts the second signal into a signal in a frequency band of the first signal. The signal processor processes an output signal of the first signal receiver or the signal converter.

Abstract: A reception quality notifying method improves upstream-line throughput by reducing the data amount of reception quality data of downstream multicarrier signals to be transmitted in the upstream line. A low-power consumption base station apparatus and a wireless communication terminal apparatus may employ the reception quality notifying method. When a wireless communication terminal apparatus receives a downstream multicarrier signal and then notifies a base station apparatus of a subcarrier having a desirable reception quality for the downstream multicarrier signal, the wireless communication terminal apparatus produces reception quality data of a plurality of formats, then selects, from among the produced reception quality data, one having the lowest data mount. The selected reception quality data is transmitted to the base station apparatus by use of an upstream multicarrier signal subcarrier designated by the base station apparatus.

Abstract: Provided is a method for selecting a receiver mode of a mobile terminal having two receivers and that can receive a signal using either or both of the two receivers depending on a channel environment. A method for selecting a receiver mode of a wireless communication terminal having at least two receivers includes computing at least one parameter for determining the receiver mode from a received signal; comparing the at least one parameter with a preset threshold; and selecting one only of a single receiver mode in which either of the two receivers is activated and a dual receiver mode in which both of the receivers are activated according to the comparison result. The method enables a receiver mode to switch between single and dual receiver modes adaptively according to a wireless environment, thus achieving stable signal reception without compromising reception sensitivity.

Abstract: A symbol clock recovery subsystem uses a tap delay line having a set of delays, uses a clock bank of samplers providing time-staggered sampled noncoherently received signals, and uses a set of mean magnitude generators, in channelized form, for providing a set of mean magnitudes to a maximum selector for selecting a maximum one of the time-staggered sampled received signals having the greatest signal to noise ratio so as to provide a signal effectively occurring at symbol epoch time for demodulating a symbol stream in a digital communication system receiver.

Abstract: A radio wave receiver that receives two different sets of radio waves and displays intensity of the received radio waves. First and second radio wave processing portions receive respective radio waves and output various kinds of information, such as video information and audio information. A switching portion receives output signals from the first and second radio wave processing portions, and switches the output signals according to a switching instruction of a controller to supply the output signals to a display portion and a speaker. The controller causes the intensities of the received radio waves in respective tuners of the first and second radio wave processing portions to be displayed simultaneously or in a switching manner based on a user's operation irrespective of which tuner's received radio waves are being processed.

Abstract: A diversity receiving device includes a processing circuit in which receiving units, AFC and synchronizing units, and demodulating units for a plurality of systems are connected, received signal intensity detecting units 104 and 105 that detect the intensities of output signals of the respective receiving units so as to output reception intensity detection signals, a control unit that determines to select one system as a synthesis pattern of demodulation signals based on a predetermined judgment criterion according to the respective reception intensity detection signals or to select a plurality of systems so as to add demodulation signals and outputs a plurality of clock interruption control signals requesting the interruption of a clock supply to unselected systems and synthesis pattern selection signals designating a synthesis pattern of demodulation signals of the selected system, a plurality of clock supply units that interrupt the clock supply to the AFC and synchronizing units and the demodulating units

Abstract: A system and method are provided for configuring an antenna array having a predetermined number of antennas. After providing an antenna correlation matrix for all antennas with regard to a mobile terminal, the antenna array is virtually partitioned into two or more sub-arrays based on the antenna correlation matrix such that correlations among antennas within each sub-array are higher than correlations among antennas belonging to different sub-arrays. One or more beamforming weights are generated corresponding to each antenna within the sub-arrays for applying to one or more signals transmitted therefrom, and at least one predetermined multiple-input-multiple-output (MIMO) mechanism is further applied among the sub-arrays by treating each sub-array as a virtual antenna.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N-channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: A method is disclosed for determining whether to transmit from a first unit to a second unit, where the transmission is one of a first type and a second type. In the method, a signal from the second unit is received at the first unit, and the strength of the signal as received at the first unit is measured. A determination is made of whether the transmission is of the first type or the second type, and a first threshold is selected if the transmission is of the first type, or else a second threshold is selected if the transmission is of the second type. The measured signal strength is then compared to the selected threshold, and the transmission proceeds only if the measured signal strength exceeds the selected threshold.

Abstract: In a receiver set, a shared receiver receives a signal formed according to one of various modulation or communication systems to output a received signal. A signal intensity detector detects the electric power value, or absolute value of the amplitude, of the received signal to output a detected signal. A determiner compares the magnitude of the detected signal with threshold voltages, and generates control signals to output them to switches. The switches are operated in response to the respective control signals fed to the switches so that the received signal is selectively fed to demodulators. The demodulators demodulate the received signal according to a receiving system corresponding to the modulation or transmission systems to output demodulated signals.

Abstract: This invention provides a signal synchronizer that is capable of minimizing the effects of multi-path reception. The signal synchronizer provides signal samples from a first signal source and a second signal source for generating an output signal. The signal synchronizer includes a memory for storing signal samples obtained from a first signal source and for storing signal samples obtained from a second signal source. Circuitry in the synchronizer determines a signal transit time difference between the first signal source and the second signal source. A readout controller then determines a memory offset from the signal transit time difference. The memory offset specifies a location in the memory from which to begin reading the signal samples obtained from the second signal source.

Abstract: A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotations and row rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.

Abstract: A receiver for receiving and processing digital satellite radio signals includes multiple antenna modules for receiving digital satellite radio signals, multiple processing circuits for converting digital satellite radio signals to low-IF or 0-IF signals, diversity circuitry for selecting from among multiple low-IF or 0-IF signals, and additional processing circuitry for extracting audio and/or data from the selected signals. The system also includes automatic and manual switches for selecting from among multiple antennas, and for reducing power consumption of antenna and processing circuitry.

Abstract: The present invention provides a method and system for operating a wireless communication system in which received signals from a plurality of antennas are weighted and combined with a beam forming operation to form an output signal. In an embodiment of the present invention, beamforming operations are performed with maximal ratio combining (MRC) and an interference nulling algorithm (INA). The INA receives an error signal which is 180° out of phase with a combination of the channels for individual antennas, referred to as the SUM channel. The error signal is determined by complex conjugate multiplication of the individual signals and a reference complex signal. The weight amplitude is controlled by weight normalization to provide faster convergence and prevent integrator overflow.

Abstract: The present invention relates to a receiver for processing a received signal (SEQ), said receiver being multimode. The invention is characterized in that it comprises; a) a single RF chip for processing the received signal (SEQ) in any mode, said chip comprising a spreading section (SPREAD SEC) for spreading and downconverting to baseband a received signal (SEQ), and a channel filtering section (CH SEC) for DC offsets rejection on a received signal (SEQ), and b) a single baseband chip (BB) comprising despreading means (DSPR) for despreading a spread signal (SEQ).

Abstract: A radio system for the reception of broadcast signals is provided that includes two antennas picking up radio signals and two signal receivers receiving the radio signals, the two antennas and the two receivers operating in diversity operating modes. The radio system further includes an antenna switching unit for creating a connection between the receivers and the antennas and a control unit for controlling the antenna switching unit and selecting the operating mode according to predetermined diversity control criterion.

Abstract: A diversity receiving device includes two signal paths. Each path interfaces an antenna that receives a radio frequency signal and an amplifier that amplifies the received radio frequency signal. A variable signal level attenuator in each path attenuates the amplified signal and receives current from current sources. The current sources are coupled to the amplifiers through variable signal level attenuators. The variable signal level attenuators are in parallel with controllable bypass lines which comprise variable resistance elements. The two signal paths are combined into a common path.

Abstract: A transceiver system includes a first section coupled to a first antenna, a second section coupled to a second antenna, and a radio frequency (RF) unit. The first section includes a transmit path and a first receive path for a first (e.g., GSM) wireless system, a transmit path and a first receive path for a second (e.g., CDMA) wireless system, and a transmit/receive (T/R) switch that couples the signal paths to the first antenna. The second section includes a second receive path for the first wireless system and a second receive path for the second wireless system. The first and second receive paths for the first wireless system are for two frequency bands. The first and second receive paths for the second wireless system are for a single frequency band and provide receive diversity. The transceiver system may include a GPS receive path coupled to a third antenna.

Abstract: An apparatus and method for frequency synchronization is proposed to obtain the pilot tones and evaluate the frequency offset and time offset for frequency synchronization. The frequency synchronization method has the following steps: filtering a baseband signal of a frequency correction burst by using multiple pre-filters; measuring the baseband signal and the signals output from the pre-filters to produce the first power value and the second power values respectively; normalizing the maximum second power value by using the first power value so as to produce the first detection value; using the samples of the baseband signal at different time points and a predetermined mathematical function to produce the second detection value; combining the first and second detection values to produce the third detection value; and using the third detection value to determine whether the frequency correction burst is received or not.

Abstract: A terminal 211 measures pilot signals transmitted in directional (beam) patterns from an adjacent cell and an own cell, and estimates reception qualities with the presence (high)/absence (low) of the interference from the adjacent cell. The terminal 211 requests data rate request values (DRC1, DRC2) corresponding to the reception qualities with the presence/absence of the interference to the base station 201. The base station 201 shares beam direction schedule with an adjacent cell base station, and confirms the presence/absence of interference to the terminal 211 for each slot. In accordance with the presence/absence of the interference, the base station 201 selects a suitable one of the two values of the data rates requested from the terminal 211, and modulates the data and transmits it.

Abstract: Antenna selection is performed in a multicarrier communication system based on antenna scores. In at least one embodiment, an antenna score is calculated for an antenna by determining grades for individual carriers associated with the antenna based on corresponding signal magnitude related parameters and then combining the grades in a predetermined fashion.

Abstract: A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.

Abstract: A reception device 81) has reception antennas (11-1 to 11-n) for receiving signals transmitted from a plurality of transmission antennas and outputting reception signals. A channel estimation device (12) estimates a channel between the antennas and outputs a channel estimation value H. A path selection device (13) inputs the channel estimation value H and calculates the channel correlation value between the transmission/reception antennas from the channel estimation value H. If the calculation result is smaller than a reference value, the path selection device (13) outputs a path selection signal selecting a path of a high power with a higher priority. On the other hand, if the calculation result is greater than the reference value, the path selection device (13) outputs a path selection signal selecting, with a higher priority, a path having a lower correlation value with a path detected by the other reception antenna.

Abstract: A method is disclosed for determining whether to transmit from a first unit to a second unit, where the transmission is one of a first type and a second type. In the method, a signal from the second unit is received at the first unit, and the strength of the signal as received at the first unit is measured. A determination is made of whether the transmission is of the first type or the second type, and a first threshold is selected if the transmission is of the first type, or else a second threshold is selected if the transmission is of the second type. The measured signal strength is then compared to the selected threshold, and the transmission proceeds only if the measured signal strength exceeds the selected threshold.

Abstract: A wireless network device comprises at least two antennas that transmit and receive data packets. An antenna diversity module measures at least one of an average signal to noise ratio (SNR) and an error rate of said data packets during at least one of transmitting and receiving N packets, where N is an integer greater than one, and selects one of said at least two antennas based on said at least one of said average SNR and said error rate.

Abstract: A method for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of the digital audio broadcast signal, the method comprising the steps of separating an analog audio portion of the digital audio broadcast signal from a digital audio portion of the digital audio broadcast signal, detecting errors in the digital audio portion of the digital audio broadcast signal, adjusting the digital audio portion of the digital audio broadcast signal in response to errors in the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion, and blending the analog audio portion with the adjusted digital audio portion to produce an audio output. A receiver that performs the method is also included.

Abstract: The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The local oscillation module generates a first and a second local oscillation. The transmitter section converts an outbound baseband signal and/or a low intermediate frequency (IF) signal into a first outbound radio frequency (RF) signal based on the second local oscillation when the wide bandwidth transceiver is in a second wireless standard mode and converts the outbound baseband and/or the low IF signal into a second outbound RF signal based on the first and second local oscillations when the wide bandwidth transceiver is in a first wireless standard mode.

Abstract: This invention provides a diversity system with identification and evaluation of antenna properties. The application also provides a method for selecting an external receiving broadcast diversity antenna. The invention makes a selection of one of the diversity antennas as efficient as possible and is able to adapt the solution found to a variety of practical situations that may arise regarding diversity reception in a vehicle. This may be accomplished by the antenna characteristics being detected and antenna selection made based on the antenna characteristics. Thus, the best reception signal will be automatically selected by the mobile broadcast receiver without human intervention or prolonged waiting time.

Abstract: A specially constructed analog processing block ahead of the traditional ADC within a typical RF front-end involving an antenna, filter, LNA, and AGC is provided. This analog block includes a structured matrix of controllable analog delay elements together with analog summers. The analog block can be used to form spectral estimates, narrow band filters, DS-SS detection, and more. The structured matrix can be programmed in order to implement SIGINT applications involving detection and characterization of communication signals.

Abstract: A user allocating apparatus and method in a multiple antenna mobile communication system supporting multi-user diversity is provided. Each user calculates effective Signal-to-Interference Noise Ratios (SINRs) and bit loading over every possible detection order and selects a detection order maximizing the number of channels with a minimum product of the minimum symbol distance of a modulation scheme and an effective SINR, thereby minimizing an average error probability. A base station receives detection orders from users and selects a user with a maximum detection order value. The base station then transmits data to the selected user using modulation schemes determined by the user for the transmit antennas.

Abstract: A system and method for processing signals are disclosed. The method may include spreading N replicas of a received signal with N orthogonal sequences. A scrambled set of N channel signals may be generated based on the spread N replicas of the received signal. M replicas of a received signal may be spread with the N orthogonal sequences. A scrambled set of M channel signals may be generated based on the spread M replicas of the received signal. The generated scrambled set of N channel signals and said generated scrambled set of M channel signals may be multiplexed onto K multiplexed channel signals on a receiver chain, where M, N and K are integers. The spread N replicas of the received signal may be combined. The combined spread N replicas of the received signal may be scrambled.

Abstract: A system and method for processing signals are disclosed. The method may include scrambling a first composite signal comprising N orthogonal sequences to generate a set of N channel signals. A second composite signal including M orthogonal sequences may be scrambled to generate a set of M channel signals. The M orthogonal sequences may be a subset of the N orthogonal sequences. The generated set of N channel signals and the generated set of M channel signals may be combined to generate K channel signals. K multiplexed channels may include the N channel signals and the M channel signals. The N channel signals may correspond to N antenna elements, and the M channel signals may correspond to M antenna elements. Each of the N channel signals may be spread utilizing a corresponding one of the N orthogonal sequences.

Abstract: Certain embodiments of the invention may be found in an single chip satellite set-top box solution that comprises demodulation, decoding and audio/video display functions integrated within a single chip. The single chip solution for the satellite set-top box is adapted to provide demodulation, display, and other related set-top box functions for a system that may be adapted to handle two incoming data streams modulated using an 8 PSK, 8 PSK-turbo or QPSK scheme, for example. Accordingly, the single chip satellite set-top box solution comprise dual 8 PSK/8 PSK-turbo/QPSK demodulators, a MIPS CPU, a 16-bit DDR-SDRAM, graphics display capability for handling two channels, and audio/video decoders and DACs for handling two incoming channels. The single chip satellite set-top box solution may also comprise integrated peripheral support for major set top box functions including a smart card interface, IR receivers, and general purpose input/output (GP/IO) pins.

Abstract: In a wireless transmitting device which performs transmission by an OFDM using a plurality of subcarriers orthogonal to each other, a plurality of preambles to which a plurality of different subcarrier groups selected from a plurality of subcarriers within an OFDM signal band are allocated are transmitted by using a plurality of transmit antennas, and data is transmitted by using the antennas after the preambles are transmitted.

Abstract: A wireless distribution system includes a number of remote units distributed in a coverage area to receive wireless signals and to provide the signals through the distribution system to input ports of an expansion unit where the signals are combined, detectors operatively connected to one or more of the plurality of input ports to determine the presence of information carrying signals at the input ports, a number of selection circuits to select signals in which information has been detected, and a node to combine the selected signals.

Abstract: The present invention is a system for increasing Signal-to-Noise Ratio (SNR) in a wireless communication system comprising a plurality of antennas each antenna providing a signal, a device for selecting a subset of signals provided by the plurality of antennas, a maximum ratio combiner for summing the selected subset of signals provided by the plurality of antennas, and a decision device for measuring the selected subset of signals against a predefined threshold. The device for selecting the subset of signals is coupled to the plurality of antennas. The maximum ratio combiner is coupled to the selected subset of signals and the decision device for measuring the selected subset of signals against a predefined threshold. The decision device is coupled to the selecting device such that one selected signal of the selected subset of signals is replaced by an unused signal provided by the plurality of antennas.

Abstract: A mobile device comprises a receiver unit that has at least two receivers to implement multi-antenna receive diversity. A control unit estimates, at the mobile, an amount of utilization by a traffic channel of the mobile of total transmission power capacity at a base station. The mobile applies multi-antenna receive diversity in the mobile device based on the power capacity utilization. The mobile estimates an amount of power a network is transmitting to the mobile relative to a pilot reference. Other indicators are based on quality of the traffic channel between the mobile and the network, capacity limiting resources, a number of sectors in a soft hand-off in a wireless system, etc. The indicators are used to control application of multi-antenna receive diversity in a mobile device.

Abstract: Input signals of each frame are encoded by mapping the signals onto a coordinate system dictated by the symbols of the previous frame, and symbols from a constellation are selected based on the results of such mapping. Received signals are detected by preprocessing the signals detected at each antenna with signals detected by the antenna at the immediately previous frame, and then applied to a maximum likelihood detector circuit, followed by an inverse mapping circuit.

Abstract: Radio receiving apparatus includes antennas, radio units adjusting gains of received signals, and outputting the adjusted received signals, respectively, converters converting the adjusted received signals into digital signals, selector device which selects several of the digital signals, combination of the selected digital signals exhibiting good receiving characteristic, controller which determines the gains and outputs single control signal included in information of the determined gains to certain radio units, the certain radio units being included in the radio units and connected to certain converters of the converters which output digital signals included in the selected combination, weight calculator which calculates weight for each of the selected digital signals to enhance the receiving characteristic if the controller outputs the single control signal, synthesizer which synthesizes, into synthetic digital signal, digital signals obtained by multiplying each of the selected digital signals by the wei

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.