Abstract: A plurality of code division multiple access (CDMA) channel signals are received as a received signal. The received signal is despread using a code of a first channel of the plurality of CDMA channel signals to produce estimates of the first channel. The estimates of the first channel are respread using the code of the first channel. The respread estimates of the first channel are subtracted from the received signal to produce a subtracted signal. The subtracted signal is despread using a code of a second channel of the plurality of CDMA channel signals to produce estimates of the second channel.

Abstract: A spread spectrum communication system produces a reference signal. A plurality of message signals are produced. Each message signal has message data. The reference signal and the plurality of message signals are combined as a combined spread spectrum signal. The combined spread spectrum signal is received. The reference signal is detected within the received combined spread spectrum signal. The message data of the plurality of message signals is recovered using the reference signal.

Abstract: A wireless communication system has spread spectrum and narrow band users. A selected base station produces a spread spectrum signal for transmission in a selected sector of the base station. The produced spread spectrum signal notch filters at frequencies. These frequencies are used by narrow band users located in the selected sector and sectors of base stations other than the selected base station adjacent tot he selected sector. The notch filtered signal is transmitted in the selected sector.

Abstract: A spread-spectrum receiver for receiving data from a spread-spectrum packet-swioched system. A multichannel spread-spectrum signal includes encoded data, which is demultiplexed into sub-data-sequence signals. Each sub-data-sequence signal is multiplied by a respective chip-sequence signal to generate a plurality of spread-spectrum channels. The plurality of spread-spectrum channels are combined as a multichannel spread-spectrum signal. The multichannel spread-spectrum signal is concatenated with a header to output a packec-spread-spectrum signal which is transmitted over radio waves to a packet receiver. A processor at the packet receiver obtains ciming for the multichannel spread-spectrum signal from the header. The multichannel spread-spectrum signal is chen despread by a plurality of data-matched filters and multiplexed by a multiplexer as received-encoded data. The received-encoded data is decoded by a decoder and stored in a receiver memory for output.

Abstract: A removable card is used in radio units. The card comprises a memory for storing telephone numbers associated with an owner of the card. One of the telephone numbers is a telephone number of the owner. The memory is configured so that upon insertion of the card in a radio unit, that radio unit receives calls associated with the owner telephone number stored on the card.

Abstract: A system and method for encoding and transmitting data with a spread-spectrum packet-switched system. Data to be transmitted by a packet transmitter are encoded for privacy and to restrict intelligent receipt of the data to the intended recipient. The encoded data is demultiplexed into sub-data-sequence signals which are spread-spectrum processed and then combined as a multichannel spread-spectrum signal. The multichannel spread-spectrum signal is concatenated with a header to output a packet-spread-spectrum signal which is transmitted over radio waves to a packet receiver. The packet receiver obtains timing for the multichannel spread-spectrum signal from the header. The multichannel spread-spectrum signal is then despread and multiplexed as received-encoded data. The received-encoded data is decoded by the intended recipient and stored in a receiver memory for output.

Abstract: A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a combined signal. The combined signal is transmitted as the combined spread spectrum signal.

Abstract: A spread spectrum remote unit produces a message signal having message data. A reference signal is produced. The reference signal is used to recover the message data from a combined spread spectrum signal. The reference signal and the message signal is combined as a combined signal. The combined signal is transmitted as the combined spread spectrum signal.

Abstract: Protecting content from piracy. A user computer stores a stored address. A smart card stores a smart-card address. The smart-card address matches the stored address. A seller stores content to be sold to the user. The content is encoded using the smart-card address from the smart card, as encoded content. A header is added to the encoded content, to generate header-encoded content. The header-encoded content is written on an encoded disk. The user computer detects the header from header-encoded content, as a detected header. The smart-card address is read from the smart card and verified with the stored address at the user computer. In response to a match and to the detected header, the encoded content embedded in the header-encoded content is decoded from the encoded disk.

Abstract: A system and method for encoding and transmitting data with a spread-spectrum packet-switched system. Data to be transmitted by a packet transmitter are encoded for privacy and to restrict intelligent receipt of the data to the intended recipient. The encoded data is demultiplexed into sub-data-sequence signals which are spread-spectrum processed and then combined as a multichannel spread-spectrum signal. The multichannel spread-spectrum signal is concatenated with a header to output a packet-spread-spectrum signal which is transmitted over radio waves to a packet receiver. The packet receiver obtains timing for the multichannel spread-spectrum signal from the header. The multichannel spread-spectrum signal is then despread and multiplexed as received-encoded data. The received-encoded data is decoded by the intended recipient and stored in a receiver memory for output.

Abstract: A spread-spectrum code division multiple access interference cancellation method employed by a remote terminal reduces interference in a direct sequence CDMA receiver having N chip-code channels. The interference canceller despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. A timed version of the plurality of chip-code signals, spread-spectrum processes the plurality of despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an ith chip-code-signal, subtracting circuits subtract from the spread-spectrum CDMA signal, each of the N?1 spread-spectrum-processed-despread signals thereby generating a subtracted signal. The N?1 spread-spectrum-processed-despread signals do not include the spread-spectrum-processed-despread signal of the ith channel of the spread-spectrum CDMA signal. The channel correlator or channel-matched filter despreads the subtracted signal.

Abstract: A spread spectrum communication system has a mobile station and a base station. The base station transmits a spread spectrum signal and a threshold. The mobile station receives the spread spectrum signal and the threshold. A received power level of the received spread spectrum signal is measured. The received power lever is compared to the threshold. The mobile station's transmission level is adjusted based on in part a result of the comparison.

Abstract: A plurality of channels are received as a received signal. Each channel is associated with a code. For each of the plurality of channels, others of the plurality of channels are subtracted from the received signal and a result of that subtracting is despread as data for that channel.

Abstract: A spread-spectrum code division multiple access interference canceller for reducing interference in a direct sequence CDMA, employed at a base station receiver having N chip-code channels. The interference canceller includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. Using a plurality of chip-code signals, the plurality of correlators despreads the spread-spectrum CDMA signal as a plurality of despread signals, respectively. The spread-spectrum-processing circuits use a timed version of the chip-code signals, for spread-spectrum processing the despread signals, respectively, with a chip-code-signal corresponding to a respective despread signal. For recovering a code channel using an ith chip-code-signal, the subtracting circuits subtracts from the spread-spectrum CDMA signal, the N?1 spread-spectrum-processed-despread signals generating a subtracted signal.

Abstract: An improvement to a spread-spectrum receiver having a matched filter. A symbol sampler samples at the symbol time TS, a symbol sample from the matched filter. A noise sampler samples at a plurality of chip times kTC, but not at the symbol time TS, a plurality of noise samples from the matched filter. An estimator or low-pass filter estimates the plurality of noise samples from the symbol sampler, to generate a noise estimate. A combiner subtracts the noise estimate from the symbol sample, thereby generating a comparison signal. A magnitude device determines a magnitude of the comparison signal. A comparator compares the magnitude of the comparison signal to the threshold voltage, thereby generating the erasure signal. An erasure decoder erasure decodes the input data using the erasure signals from the erasure detector.

Abstract: An improvement to a spread-spectrum code-division-multiple-access system, using a channel sounding signal from a base station (BS) to provide initial transmitter power levels for remote stations (RS). The base station has a BS-spread-spectrum transmitter for transmitting BS-spread-spectrum signals at a first frequency and a BS-spread-spectrum receiver for receiving RS-spread-spectrum signals at a second frequency. The RS-spread-spectrum signals are transmitted by the remote stations at the second frequency. The BS-spread-spectrum signals at the first frequency are outside the correlation bandwidth of the RS-spread-spectrum signals at the second frequency. The base station has a BS transmitter for transmitting a BS-channel-sounding signal at the same carrier frequency being used by the remote stations to transmit a spread-spectrum signal to the base station. The bandwidth of the BS-channel-sounding signal is much of the bandwidth of the BS-spread-spectrum signal.

Abstract: A high data rate, high processing gain, direct sequence spread spectrum system that transmits a BPSK or QPSK signal. The system FEC encodes and interleaves data which are collected and stored and forwarded N bits at a time by transmitting one of 2N pseudo random waveforms every time N bits are collected. The 2N pseudo random waveforms can be sent as an orthogonal, bi-orthogonal, or nearly orthogonal waveform. During acquisition, a plurality of product devices multiply a received spread-spectrum signal by a header chip-sequence signal. In each case, the header chip-sequence signal has a different delay, with each delay being at most one chip. Acquisition can also be achieved using a matched filter.

Abstract: Protecting content from piracy. A user computer stores a stored address. A smart card stores a smart-card address. The smart-card address matches the stored address. A seller stores content to be sold to the user. The content is encoded using the smart-card address from the smart card, as encoded content. A header is added to the encoded content, to generate header-encoded content. The header-encoded content is written on an encoded disk. The user computer detects the header from header-encoded content, as a detected header. The smart-card address is read from the smart card and verified with the stored address at the user computer. In response to a match and to the detected header, the encoded content embedded in the header-encoded content is decoded from the encoded disk.

Abstract: An improvement to a telephone system using a Digital Subscriber Loop (DSL). A second broadband-data signal, which may be a computer signal, a television signal, or other broadband or video signal, is encoded, for overlaying the first broadband-data signal, in one of four or more bands. The encoding multiplies the second broadband-data signal by an encoding signal. The encoding signal typically includes a Walsh function. The encoded-second broadband-data signal is transmitted, at a respective carrier frequency for one of the four or more bands, over a DSL communications channel. At a remote subscriber unit, the encoded-second broadband-data signal is decoded. A respective replica of the encoding signal, as used for the encoding, decodes the encoded-second broadband-data signal. The decoded-second broadband-data signal is converted to the second broadband-data signal.

Abstract: A high-capacity-spread-spectrum transmitter and receiver, for use over a communications channel. A demultiplexer demultiplexes message data into a plurality of demultiplexed-data signals. A transmitter-generic-chip-code generator generates a generic-chip-code signal and a plurality of transmitter-message-chip-code generators generate a plurality of message-chip-code signals which are “near-orthogonal” over a demultiplexed data bit. A plurality of EXCLUSIVE-OR gates, spread-spectrum processes the plurality of demultiplexed-data signals with the plurality of message-chip-code signals to generate a plurality of spread-spectrum signals. A combiner combines the generic-chip-code signal and the plurality of spread-spectrum-processed signals. A receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. A generic mixer recovers the carrier signal from the spread-spectrum-communications signal.