Wideband subcarrier wireless transceiver circuits and systems
AssigneeRF DSP Inc.
InventorsJason Brent, Dengkui Zhu, Ping Liang
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Abstract
This invention discloses methods and circuits of wideband wireless transmitting and/or receiving by combining multiple RF transmitters and/or receivers, or multiple transceivers, each of which has a narrower bandwidth, e.g., producing a RF transmitter and receiver or a RF transceiver whose signal bandwidth is the sum or approximately the sum, e.g., slightly less than the sum, of the signal bandwidth of the multiple RF transmitters and/or receivers, or multiple RF transceivers. The embodiments apply in wireless communication systems with orthogonal or approximately orthogonal subcarrier type of modulation (OSM), e.g., Orthogonal Frequency Division Multiplexing (OFDM).
Claims20
An apparatus of wireless transmission and/or reception of a wireless signal of transmission bandwidth BT with carrier frequency fc using an Orthogonal or approximately orthogonal Subcarrier type of Modulation (OSM) with a Transformed Time Domain (TTD) transformation and its inverse ITTD size of NFFT comprising
- K (K≥2) transmitting paths and/or M (M≥2) receiving paths of OSM signals, wherein the kth, k=1 to K, transmitting path and/or kth, k=1 to M, receiving path has a signal band with a bandwidth BTk<BT which is located next to the signal band(s) of the (k−1)th path and/or the (k+1)th path;
- a local oscillator (LO) for each path wherein the frequency of the LO of the kth path is the center frequency of the signal band of the kth path;
- an analog interface that feeds the outputs of the K transmitting paths to a combiner that combines the K transmitting paths to produce a transmitting signal of bandwidth BT with carrier frequency fc and/or that receives the M signals from a splitter that divides a received signal of bandwidth BT with carrier frequency fc into M paths to feed into the M receiving paths;
- and
- a digital interface that feeds each of K segments divided from a sequence of N (N≤NFFT) samples of the wireless signal of bandwidth BT to one of the K transmitting paths and/or receives a segment of samples from each of the M receiving paths which are to be concatenated with the segments from other receiving paths to form a sequence of N (N≤NFFT) samples of the wireless signal of bandwidth BT, wherein the length of each segment Nk is proportional to the bandwidth BTk of the path and the samples of each segment undergoes an Nk-point ITTD transformation and addition of Cyclic Prefix (CP) in a transmitting path and/or removal of CP and an Nk-point TTD transformation in a receiving path.
A method of wireless transmission and/or reception of a wireless signal of transmission bandwidth BT with carrier frequency fc using an Orthogonal or approximately orthogonal Subcarrier type of Modulation (OSM) with a Transformed Time Domain (TTD) transformation and its inverse ITTD size of NFFT comprising
- using K (K≥2) transmitting paths to transmit and/or M (M≥2) receiving paths to receive OSM signals, wherein the kth, k=1 to K, transmitting path and/or kth, k=1 to M, receiving path has a signal band with a bandwidth BTk<BT which is located next to the signal band(s) of the (k−1)th path and/or the (k+1)th path;
- using a local oscillator (LO) to generate a carrier frequency for each path wherein the frequency of the LO of the kth path is the center frequency of the signal band of the kth path;
- using an analog interface to feed the outputs of the K transmitting paths to a combiner that combines the K transmitting paths to produce a transmitting signal of bandwidth BT with carrier frequency fc and/or to receive the M signals from a splitter that divides a received signal of bandwidth BT with carrier frequency fc into M paths to feed into the M receiving paths;
- and
- using a digital interface to feed each of K segments divided from a sequence of N (N≤NFFT) samples of the wireless signal of bandwidth BT to one of the K transmitting paths and/or to receive a segment of samples from each of the M receiving paths which are to be concatenated with the segments from other receiving paths to form a sequence of N (N≤NFFT) samples of the wireless signal of bandwidth BT, wherein the length of each segment Nk is proportional to the bandwidth BTk of the path and the samples of each segment undergoes an Nk-point ITTD transformation and addition of Cyclic Prefix (CP) in a transmitting path and/or removal of CP and an Nk-point TTD transformation in a receiving path.
Dependencies are inferred from the claim text.