MC-CDMA WITH LOW PEAK-TO-AVERAGE POWER RATIO MULTI-CARRIER WAVEFORM
FIG1 is a block diagram of a communications network according to an embodiment of the present disclosure
FIG1 illustrates a communications network 100 comprising multiple user devices 102A, 102B, 102C, 102D and a network node 104. The network 100 may operate according to one or more communications or data standards or technologies including but not limited to fourth generation (4G) telecommunications networks such as Long-Term Evolution (LTE) networks, Universal Mobile Telecommunications System (UMTS) and other wireless or mobile communications networks. The user devices 102, sometimes known as user equipment (UEs), are generally any device capable of providing wireless communications such as a wireless transmit/receive unit (WTRU), mobile station (MS), smartphone, cellular telephone, sensor, or other wireless enabled computing or mobile device. In some embodiments, the user devices 102 comprise machines which perform other primary functions and have the capability to send, receive, or send and receive data in the communications network 100. In one embodiment, a machine includes an apparatus or device with means to transmit and/or receive data through the communications network 100 but such apparatus or device is not typically operated by a user for the primary purpose of communications. It will be appreciated that the systems and methods described herein also may be applied to other low data rate transmission scenarios or applications and devices operating with unscheduled data transmissions. The network node 104 may comprise a base station (BS), evolved Node B (eNB), access point (AP), or other network interface which functions as a transmission and/or reception point for user devices 102 in the network 100. The network node 104 is connected to a backhaul network 110 which enables data to be exchanged between the network node 104 and other remote networks, nodes and devices (not shown).
block diagram
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1
Optional Embodiment
100
network
104
network node
110
backhaul network
['1. A method for operating a device in a wireless network, the method comprising: spreading data with a spreading sequence, using discrete Fourier transform-spread orthogonal division multiplexing, DFT-S-OFDM, to generate multi-carrier spread data on subcarriers corresponding to non-zero subcarrier elements of the spreading sequence, the spreading sequence having sparsity of non-zero subcarrier elements and an equal spacing between adjacent non-zero subcarrier elements; and transmitting the multi-carrier spread data, wherein the spreading sequence is selected from a plurality of spreading sequences, each spreading sequence of the plurality having a respective equal spacing between adjacent non-zero subcarrier elements, the spreading sequences of the plurality differing from one another in at least one of: sparsity level in the frequency domain; sparsity pattern in the frequency domain; and pulse offset in the time domain.']