Methods, devices, and systems for the transmission of information in a wireless communication system are disclosed. In one embodiment, a method for the transmission of information in a wireless communication system comprises receiving a downlink message, wherein the downlink message includes a first control channel element; determining a first index using the location of the first control channel element; determining a second index; determining a first orthogonal resource using the first index; determining a second orthogonal resource using the second index; spreading an uplink message using the first orthogonal resource to form a first spread signal; spreading the uplink message using a second orthogonal resource to form a second spread signal; transmitting the first spread signal using a first antenna; and transmitting the second spread signal using a second antenna.

A wireless communication unit may receive a composite signal that includes data, a code division multiplexing (CDM) pilot sequence that is spread with a first channelization code, and a time division multiplexing (TDM) pilot sequence including a cyclic prefix. The TDM pilot sequence may be spread with a second channelization code. The composite signal may have a pre-defined portion of a time slot where the CDM pilot sequence is non-cyclic. The TDM pilot sequence may have a cyclic structure within the pre-defined portion of the time slot.

A spread spectrum system is used for transmitting data to and from devices operable as sensors and actuators in a distributed system. Communication is made through a series of aggregation nodes in a branched hierarchical network. Each device and aggregation node has a respective spread spectrum code, and has a corresponding encoder/decoder in a central control system operating the same spread spectrum codes, the encoded data relating to the devices being aggregated over a shared channel. At each level in the hierarchy the aggregated signals to/from the next level are recoded. This allows the same codes to be re-used at different levels, and in different sub-branches in the same level, increasing the number of devices that can be served on one channel.

A method by which a transmitting end operates in a wireless communication system comprises the steps of: performing sparse coding on information so as to have sparsity of which the number of non-zero symbols is K; configuring a codebook by including a code for spreading for each user; spreading the coded information by using one or more codes in the codebook; and transmitting a channel by overlapping the spread information. Therefore, even if the number of encoded symbols increases, the number of symbols actually having a value is very sparsely configured such that the complexity of a transmitter and a receiver does not increase, and thus restoration performance improves.

The present invention provides an information transmission method, including: generating first information; determining a first sequence from N candidate sequences based on the first information, where the first information belongs to N candidate information, a mapping between the first information and the first sequence belongs to P mappings, each of the P mappings includes a mapping between the N candidate information and the N candidate sequences, and the N candidate sequences are generated based on N dedicated cyclic shift values and a first initial cyclic shift value; and in at least two mappings, dedicated cyclic shift values used to generate candidate sequences corresponding to a same candidate information are different, where the same candidate information belongs to L candidate information in the N candidate information, both P and L are integers greater than 1, and the L is less than or equal to N; and sending the first sequence.

Aspects of the present disclosure provide a scheme for generating a multiple access (MA) signal that include mapping each of at least one stream of bits to generate a set of modulated symbols and transmitting the set of modulated symbols. The spreading signatures that are selected to map the at least one stream of bits are selected, at least in part, based on a set of compatibility rules. The spreading involves mapping each stream of bits using a respective spreading signature from a set of spreading signatures to generate a respective set of modulated symbols, wherein real spreading signature components of the spreading signatures are orthogonal to each other and imaginary spreading signature components of the spreading signatures are orthogonal to each other.

Disclosed in the embodiments of the present invention is a data transmission method. The method includes: a transmitter transmitting, on a first time frequency resource region, transmission signals that are generated from a bit sequence B using at least a symbol extension technology; the extension sequence used by the symbol extension technology being the Index1-th sequence of a sequence set containing K1 extension sequences, the Index1-th characterizing the first index value; the transmitter using part of the bits of the bit sequence B and a bit sequence B0 as a bit sequence B2, and transmitting, over the Index2-th sub-resource pool of a second time frequency resource region containing K2 sub-resource pools, transmission signals generated on the basis of the bit sequence B2; the Index2-th characterizing a second index value; the first index value Index1 and the second index value Index2 both being determined according to the bit sequence B0.

A wireless communication may receive a composite signal that includes data symbols, a code division multiplexing (CDM) pilot sequence that is spread with a first channelization code, and a time division multiplexing (TDM) pilot sequence including a cyclic prefix where the TDM pilot sequence is spread with a second channelization code. The composite signal may be received within a designated time region such that the CDM pilot sequence has non-cyclic properties over the designated time region. The composite signal may be descrambled with a non-cyclic scrambling code.

This application discloses a multi-codeword transmission method and an apparatus. The method includes: generating, by a network device, downlink control information corresponding to each of a plurality of code words to be sent to a terminal device, where the downlink control information corresponding to each code word includes at least one of the following: a physical downlink shared channel resource element mapping and quasi-co-location indicator, and an antenna port(s), scrambling identity and number of layers; and sending, by the network device, downlink control information corresponding to the plurality of code words to the terminal device. Corresponding apparatuses are further disclosed. According to the technical solutions of this application, the network device generates the downlink control information corresponding to each of the plurality of code words to be sent to the terminal device, and the terminal device may demodulate data for the plurality of code words based on downlink control information corresponding to the plurality of code words. This ensures that the terminal device correctly demodulates data in a multi-codeword transmission scenario.

RF communication systems that provide combined demodulation and despreading are provided herein. In certain embodiments, an RF communication system generates an in-phase (I) signal and a quadrature-phase (Q) signal based on processing a received spread spectrum signal carrying a sequence of data symbols. The data symbols each have a symbol period and are coded by one or more multi-bit spreading codes. The RF communication system includes a symbol correlator that delays the I signal and the Q signal by an integer number of symbol periods to thereby generate a delayed I signal and a delayed Q signal, respectively. Additionally, the symbol correlator generates a correlation signal based on correlating the delayed I signal to the I signal and correlating the delayed Q signal to the Q signal. The RF communication system processes the correlation signal to recover the sequence of data symbols.