BCH block index when Lmax = 4 and the three least significant bits of the SS/PBCH block index when Lmax = 8 or 64 where Lmax denotes the maximum number of SS/PBCH blocks in an SS/PBCH period for a particular band (see Section 4.1.4.3). block scrambled bits bo, b1, bNPBCH~1 is QPSK modulated, resulting in a block of complex-valued modulation symbols dPBCH(0), dPBCH(1), dpBCH(Nsymb mapping of the modulated symbols to the physical resources is described in Section 4.1.4.3. The PBCH exploits a special type of DM-RS that is used for coherent detection and decoding of PBCH [6]. The total number of resource elements used for PBCH transmission per SS block is 576. Note that this number includes the resource elements for PBCH and the resource elements for the DM-RS needed for coherent demodulation of PBCH. Different numerolo- gies can be used for SS/PBCH block transmission. However, to limit the need for devices to simultaneously search for SS/PBCH blocks of different numerologies, in many cases only a single SS block numerology is defined for a given frequency band. The DM-RS sequence r PBCH (m) for an SS/PBCH block is defined by rppch(m) = ([1 - 2c(2m) +j[1 - 2c(2m 1)]/2) where c(n) is a length-31 Gold sequence generated by the pseudo-random sequence generator defined in [6] and initialized at the start of each SS/PBCH block with Cinit = (iSSB + 26 (issb + (Ncell ID mod 4) [6]. L = 4, iSSB = iSSB 4nhf where Nhf denotes the number of the half-frame in which PBCH is transmitted in a frame with Nhf = 0 for the first half-frame in the frame and Nhf = 1 for the second half-frame in the frame, and iSSB is the two least significant bits of the SS/PBCH block index. In the case that L = 8 or L = 64, Nhf = 0, and iSSB = iSSB are the three least sig- nificant bits of the SS/PBCH block index. Note that L denotes the maximum number of SS/ PBCH block beams in an SS/PBCH block period for a particular band [3]. 438 Chapter 4 sequence of complex-valued QPSK-modulated symbols dPBCH(0), dPBCH (1), , dpBCH(Nsymb - 1) containing the PBCH in